WO2005001078A2 - Regeneration and repair of neural tissue using postpartum-derived cells - Google Patents
Regeneration and repair of neural tissue using postpartum-derived cellsInfo
- Publication number
- WO2005001078A2 WO2005001078A2 PCT/US2004/020823 US2004020823W WO2005001078A2 WO 2005001078 A2 WO2005001078 A2 WO 2005001078A2 US 2004020823 W US2004020823 W US 2004020823W WO 2005001078 A2 WO2005001078 A2 WO 2005001078A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cells
- cell
- protein
- derived
- postpartum
- Prior art date
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Definitions
- This invention relates to the field of cell-based or regenerative therapy for neurological diseases and disorders.
- the invention provides pharmaceutical compositions, devices and methods for the regeneration or repair of neural tissue using postpartum derived cells.
- Neurological diseases and other disorders of the central and peripheral nervous system are among the most debilitating that can be suffered by an individual, not only because of their physical effects, but also because of their permanence.
- a patient suffering from brain or spinal cord injury, or a neurodegenerative condition of the central or peripheral nervous system, such as Parkinson's disease, Alzheimer's disease or multiple sclerosis, to name a few held little hope for recovery or cure.
- Neurological damage and neurodegenerative diseases were long thought to be irreversible because of the inability of neurons and other cells of the nervous system to grow in the adult body.
- stem cell-based therapy for tissue repair and regeneration provides promising treatments for a number of neurodegenerative pathologies and other neurological disorders.
- Stem cells are capable of self-renewal and differentiation to generate a variety of mature neural cell lineages. Transplantation of such cells can be utilized as a clinical tool for reconstituting a target tissue, thereby restoring physiologic and anatomic functionality.
- the application of stem cell technology is wide-ranging, including tissue engineering, gene therapy delivery, and cell therapeutics, i.e., delivery of biotherapeutic agents to a target location via exogenously supplied living cells or cellular components that produce or contain those agents (For a review, see Tresco, P.A. et al., 2000, Advanced Drug Delivery Reviews 42: 2-37).
- stem cell technology An obstacle to realization of the therapeutic potential of stem cell technology has been the difficulty of obtaining sufficient numbers of stem cells.
- One source of stem cells is embryonic or fetal tissue.
- Embryonic stem and progenitor cells have been isolated from a number of mammalian species, including humans, and several such cell types have been shown capable of self-renewal and expansion, as well differentiation into all neurological cell lineages. But the derivation of stem cells from embryonic or fetal sources has raised many ethical and moral issues that are desirable to avoid by identifying other sources of multipotent or pluripotent cells.
- Stem cells with neural potency also have been isolated from adult tissues. Neural stem cells exist in the developing brain and in the adult nervous system.
- adult neural stem cells are rare, as well as being obtainable only by invasive procedures, and may have a more limited ability to expand in culture than do embryonic stem cells.
- Other adult tissue may also yield progenitor cells useful for cell-based neural therapy.
- postpartum tissues such as the umbilical cord and placenta, have generated interest as an alternative source of stem cells. For example, methods for recovery of stem cells by perfusion of the placenta or collection from umbilical cord blood or tissue have been described.
- a limitation of stem cell procurement from these methods has been an inadequate volume of cord blood or quantity of cells obtained, as well as heterogeneity in, or lack of characterization of, the populations of cells obtained from those sources.
- alternative sources of adequate supplies of cells having the ability to differentiate into an array of neural cell lineages remain in great demand.
- a reliable, well-characterized and plentiful supply of substantially homogeneous populations of such cells would be an advantage in a variety of diagnostic and therapeutic applications in neural repair and regeneration, including drug screening assays, ex vivo or in vitro trophic support of other neural cells, and in vivo cell- based therapy.
- compositions and methods applicable to cell-based or regenerative therapy for neurological diseases and disorders features pharmaceutical compositions, devices and methods for the regeneration or repair of neural tissue using postpartum-derived cells.
- One aspect of the invention features an isolated postpartum-derived cell, derived from human placental or umbilical cord tissue substantially free of blood, wherein the cell is capable of self-renewal and expansion in culture and has the potential to differentiate into a cell of a neural phenotype; wherein the cell requires L-valine for growth and is capable of growth in at least about 5% oxygen.
- This cell further comprises one or more of the following characteristics: (a) potential for at least about 40 doublings in culture; (b) attachment and expansion on a coated or uncoated tissue culture vessel, wherein the coated tissue culture vessel comprises a coating of gelatin, laminin, collagen, polyomithine, vitronectin, or fibronectin; (c) production of at least one of tissue factor, vimentin, and alpha-smooth muscle actin; (d) production of at least one of CD10, CD13, CD44, CD73, CD90, PDGFr-alpha, PD-L2 and HLA-A,B,C; (e) lack of production of at least one of CD31, CD34, CD45, CD80, CD86, CD117, CD141, CD178, B7-H2, HLA-G, and HLA-DR,DP,DQ, as detected by flow cytometry; (f) expression of a gene, which relative to a human cell that is a fibroblast, a mesenchymal stem cell
- the postpartum-derived cell is an umbilicus-derived cell. In other embodiments it is a placenta-derived cell. In specific embodiments, the cell has all identifying features of any one of: cell type PLA 071003 (P8) (ATCC Accession No. PTA- 6074); cell type PLA 071003 (Pl l) (ATCC Accession No. PTA-6075); cell type PLA 071003 (P16) (ATCC Accession No. PTA-6079); cell type UMB 022803 (P7) (ATCC Accession No. PTA-6067); or cell type UMB 022803 (P17) (ATCC Accession No. PTA-6068).
- postpartum-derived cells are isolated in the presence of one or more enzyme activities comprising metalloprotease activity, mucolytic activity and neutral protease activity.
- the cells have a normal karyotype, which is maintained as the cells are passaged in culture.
- the postpartum-derived cells comprise each of CD10, CD13, CD44, CD73, CD90, PDGFr-alpha, and HLA-A,B,C and does not comprise any of CD31, CD34, CD45, CD117, CD141, or HLA-DR,DP,DQ, as detected by flow cytometry.
- Another aspect of the invention features a cell population comprising the postpartum- derived cells as described above.
- the population is a substantially homogeneous population of the postpartum-derived cells.
- the population comprises a clonal cell line of the postpartum-derived cells.
- the population is a heterogeneous population comprising the postpartum-derived cells and at least one other cell type.
- the other cell type is an astrocyte, oligodendrocyte, neuron, neural progenitor, neural stem cell or other multipotent or pluripotent stem cell.
- the cell population is cultured in contact with one or more factors that stimulate stem cell differentiation toward a neural lineage.
- a cell lysate prepared from postpartum-derived cells.
- the cell lysate may be separated into a membrane enriched fraction and a soluble cell fraction.
- the invention also features an extracellular matrix produced by the postpartum-derived cells, as well as a conditioned medium in which the cells have been grown.
- Another aspect of the invention features a method of treating a patient having a neurodegenerative condition, the method comprising administering to the patient postpartum- derived cells as described above, in an amount effective to treat the neurodegenerative condition.
- the neurodegenerative condition is an acute neurodegenerative condition, such as a brain trauma, spinal cord trauma or peripheral nerve trauma.
- the postpartum-derived cells are induced in vitro to differentiate into a neural lineage cells prior to administration.
- the cells are genetically engineered to produce a gene product that promotes treatment of the neurodegenerative condition.
- the cells are administered with at least one other cell type, such as an astrocyte, oligodendrocyte, neuron, neural progenitor, neural stem cell or other multipotent or pluripotent stem cell.
- the other cell type can be administered simultaneously with, or before, or after, the postpartum-derived cells.
- the cells are administered with at least one other agent, such as a drug for neural therapy, or another beneficial adjunctive agent such as an anti-inflammatory agent, anti-apoptotic agents, antioxidant or growth factor.
- the other agent can be administered simultaneously with, or before, or after, the postpartum-derived cells.
- the cells are administered at a pre-determined site in the central or peripheral nervous system of the patient. They can be administered by injection or infusion, or encapsulated within an implantable device, or by implantation of a matrix or scaffold containing the cells.
- Another aspect of the invention features a pharmaceutical composition for treating a patient having a neurodegenerative condition, comprising a pharmaceutically acceptable carrier and the postpartum-derived cells described above.
- the neurodegenerative condition to be treated may be an acute neurodegenerative condition, or it may be a chronic or progressive condition.
- the pharmaceutical composition comprises cells that have been induced in vitro to differentiate into a neural lineage cells prior to formulation of the composition, or cells that have been genetically engineered to produce a gene product that promotes treatment of the neurodegenerative condition.
- the pharmaceutical composition comprises at least one other cell type, such as astrocyte, oligodendrocyte, neuron, neural progenitor, neural stem cell or other multipotent or pluripotent stem cell.
- the pharmaceutical composition comprises at least one other agent, such as a drug for neural therapy, or another beneficial adjunctive agent such as an anti-inflammatory agent, anti-apoptotic agents, antioxidant or growth factor.
- the pharmaceutical composition is formulated for administration by injection or infusion. Alternatively, it may comprise an implantable device in which the cells are encapsulated, or a matrix or scaffold containing the cells.
- a kit is provided for treating a patient having a neurodegenerative condition. The kit comprises a pharmaceutically acceptable carrier, a population of the above-described postpartum-derived cells and instructions for using the kit in a method of treating the patient.
- the kit may further comprises at least one reagent and instructions for culturing the postpartum-derived cells. It may also comprise a population of at least one other cell type, or at least one other agent for treating a neurodegenerative condition.
- a method is provided for treating a patient having a neurodegenerative condition, which comprises administering to the patient and a preparation made from the above-described postpartum-derived cells. Such a preparation may comprises a cell lysate (or fraction thereof) of the postpartum-derived cells, an extracellular matrix of the postpartum-derived cells, or a conditioned medium in which the postpartum- derived cells were grown.
- the invention features a pharmaceutical composition
- a pharmaceutically acceptable carrier and a preparation made from the postpartum-derived cells, which may be a cell lysate (or fraction thereof) of the postpartum- derived cells, an extracellular matrix of the postpartum-derived cells or a conditioned medium in which the postpartum-derived cells were grown.
- Kits for practicing this aspect of the invention are also provided. These may include the one or more of a pharmaceutically acceptable carrier or other agent or reagent, one or more of a cell lysate or fraction thereof, an extracellular matrix or a conditioned medium from the postpartum-derived cells, and instructions for use of the kit components.
- Another aspect of the invention features a method for increasing the survival, growth or activity of neural lineage cells.
- the method comprises co-culturing the neural lineage cells with the postpartum-derived cells of the invention, under conditions effective to increase the survival, growth or activity of the neural lineage cells.
- a kit for practicing the method is also provided.
- the kit comprises the postpartum-derived cells and instructions for co-culturing the neural lineage cells with the postpartum-derived cells under conditions effective to increase the survival, growth or activity of the neural lineage cells.
- Stem cells are undifferentiated cells defined by the ability of a single cell both to self- renew, and to differentiate to produce progeny cells, including self-renewing progenitors, non- renewing progenitors, and terminally differentiated cells. Stem cells are also characterized by their ability to differentiate in vitro into functional cells of various cell lineages from multiple germ layers (endoderm, mesoderm and ectoderm), as well as to give rise to tissues of multiple germ layers following transplantation, and to contribute substantially to most, if not all, tissues following injection into blastocysts.
- Stem cells are classified according to their developmental potential as: (1) totipotent; (2) pluripotent; (3) multipotent; (4) oligopotent; and (5) unipotent.
- Totipotent cells are able to give rise to all embryonic and extraembryonic cell types.
- Pluripotent cells are able to give rise to all embryonic cell types.
- Multipotent cells include those able to give rise to a subset of cell lineages, but all within a particular tissue, organ, or physiological system (for example, hematopoietic stem cells (HSC) can produce progeny that include HSC (self-renewal), blood cell-restricted oligopotent progenitors, and all cell types and elements (e.g., platelets) that are normal components of the blood).
- HSC hematopoietic stem cells
- Cells that are oligopotent can give rise to a more restricted subset of cell lineages than multipotent stem cells; and cells that are unipotent are able to give rise to a single cell lineage (e.g., spermatogenic stem cells).
- Stem cells are also categorized on the basis of the source from which they may be obtained.
- An adult stem cell is generally a multipotent undifferentiated cell found in tissue comprising multiple differentiated cell types.
- the adult stem cell can renew itself. Under normal circumstances, it can also differentiate to yield the specialized cell types of the tissue from which it originated, and possibly other tissue types.
- An embryonic stem cell is a pluripotent cell from the inner cell mass of a blastocyst-stage embryo.
- fetal stem cell is one that originates from fetal tissues or membranes.
- a postpartum stem cell is a multipotent or pluripotent cell that originates substantially from extraembryonic tissue available after birth, namely, the placenta and the umbilical cord.
- Postpartum stem cells may be blood-derived (e.g., as are those obtained from umbilical cord blood) or non-blood-derived (e.g., as obtained from the non-blood tissues of the umbilical cord and placenta).
- Embryonic tissue is typically defined as tissue originating from the embryo (which in humans refers to the period from fertilization to about six weeks of development.
- Fetal tissue refers to tissue originating from the fetus, which in humans refers to the period from about six weeks of development to parturition.
- Extraembryonic tissue is tissue associated with, but not originating from, the embryo or fetus.
- Extraembryonic tissues include extraembryonic membranes (chorion, amnion, yolk sac and allantois), umbilical cord and placenta (which itself forms from the chorion and the maternal decidua basalis).
- Differentiation is the process by which an unspecialized ("uncommitted") or less specialized cell acquires the features of a specialized cell, such as a nerve cell or a muscle cell, for example.
- a differentiated cell is one that has taken on a more specialized ("committed") position within the lineage of a cell.
- the term committed when applied to the process of differentiation, refers to a cell that has proceeded in the differentiation pathway to a point where, under normal circumstances, it will continue to differentiate into a specific cell type or subset of cell types, and cannot, under normal circumstances, differentiate into a different cell type or revert to a less differentiated cell type.
- De-differentiation refers to the process by which a cell reverts to a less specialized (or committed) position within the lineage of a cell.
- the lineage of a cell defines the heredity of the cell, i.e. which cells it came from and what cells it can give rise to.
- the lineage of a cell places the cell within a hereditary scheme of development and differentiation. In a broad sense, a.
- progenitor cell is a cell that has the capacity to create progeny that are more differentiated than itself, and yet retains the capacity to replenish the pool of progenitors.
- stem cells themselves are also progenitor cells, as are the more immediate precursors to terminally differentiated cells.
- this broad definition of progenitor cell may be used.
- a progenitor cell is often defined as a cell that is intermediate in the differentiation pathway, i.e., it arises from a stem cell and is intermediate in the production of a mature cell type or subset of cell types. This type of progenitor cell is generally not able to self- renew.
- this type of cell it will be referred to as a non- renewing progenitor cell or as an intermediate progenitor or precursor cell.
- the phrase differentiates into a neural lineage or phenotype refers to a cell that becomes partially or fully committed to a specific neural phenotype of the CNS or PNS, i.e., a neuron or a glial cell, the latter category including without limitation astrocytes, oligodendrocytes, Schwann cells and microglia.
- the cells of the present invention are generally referred to as postpartum-derived cells (or PPDCs).
- umbilicus-derived cells o ⁇ placenta-derived cells (UDCs or PDCs).
- the cells may be described as being stem or progenitor cells, the latter term being used in the broad sense.
- the term derived is used to indicate that the cells have been obtained from their biological source and grown or otherwise manipulated in vitro (e.g., cultured in a Growth Medium to expand the population and/or to produce a cell line).
- the in vitro manipulations of umbilical stem cells and the unique features of the umbilicus-derived cells of the present invention are described in detail below. Various terms are used to describe cells in culture.
- Cell culture refers generally to cells taken from a living organism and grown under controlled condition ("in culture” or "cultured”).
- a primary cell culture is a culture of cells, tissues, or organs taken directly from an organism(s) before the first subculture. Cells are expanded in culture when they are placed in a Growth Medium under conditions that facilitate cell growth and/or division, resulting in a larger population of the cells. When cells are expanded in culture, the rate of cell proliferation is sometimes measured by the amount of time needed for the cells to double in number. This is referred to as doubling time.
- a cell line is a population of cells formed by one or more subcultivations of a primary cell culture. Each round of subculturing is referred to as a passage.
- cells When cells are subcultured, they are referred to as having been passaged.
- a specific population of cells, or a cell line is sometimes referred to or characterized by the number of times it has been passaged.
- a cultured cell population that has been passaged ten times may be referred to as a PI 0 culture.
- the primary culture i.e., the first culture following the isolation of cells from tissue, is designated P0.
- P0 a cultured cell population that has been passaged ten times
- the cells are described as a secondary culture (PI or passage 1).
- P2 or passage 2 tertiary culture
- a conditioned medium is a medium in which a specific cell or population of cells has been cultured, and then removed. When cells are cultured in a medium, they may secrete cellular factors that can provide trophic support to other cells.
- trophic factors include, but are not limited to hormones, cytokines, extracellular matrix (ECM), proteins, vesicles, antibodies, and granules.
- the medium containing the cellular factors is the conditioned medium.
- a trophic factor is defined as a substance that promotes survival, growth, differentiation, proliferation and /or maturation of a cell, or stimulates increased activity of a cell.
- the interaction between cells via trophic factors may occur between cells of different types. Cell interaction by way of trophic factors is found in essentially all cell types, and is a particularly significant means of communication among neural cell types.
- Trophic factors also can function in an autocrine fashion, i.e., a cell may produce trophic factors that affect its own survival, growth, differentiation, proliferation and or maturation.
- senescence also replicative senescence or cellular senescence refers to a property attributable to finite cell cultures; namely, their inability to grow beyond a finite number of population doublings (sometimes referred to as Hayflick's limit).
- fibroblast-like cells most normal human cell types that can be grown successfully in culture undergo cellular senescence.
- the in vitro lifespan of different cell types varies, but the maximum lifespan is typically fewer than 100 population doublings (this is the number of doublings for all the cells in the culture to become senescent and thus render the culture unable to divide). Senescence does not depend on chronological time, but rather is measured by the number of cell divisions, or population doublings, the culture has undergone. Thus, cells made quiescent by removing essential growth factors are able to resume growth and division when the growth factors are re- introduced, and thereafter carry out the same number of doublings as equivalent cells grown continuously. Similarly, when cells are frozen in liquid nitrogen after various numbers of population doublings and then thawed and cultured, they undergo substantially the same number of doublings as cells maintained unfrozen in culture.
- neurodegenerative condition is an inclusive term encompassing acute and chronic conditions, disorders or diseases of the central or peripheral nervous system.
- a neurodegenerative condition may be age-related, or it may result from injury or trauma, or it may be related to a specific disease or disorder.
- Acute neurodegenerative conditions include, but are not limited to, conditions associated with neuronal cell death or compromise including cerebrovascular insufficiency, focal or diffuse brain trauma, diffuse brain damage, spinal cord injury or peripheral nerve trauma, e.g., resulting from physical or chemical burns, deep cuts or limb severance.
- Examples of acute neurodegenerative disorders are: cerebral ischemia or infarction including embolic occlusion and thrombotic occlusion, reperfusion following acute ischemia, perinatal hypoxic-ischemic injury, cardiac arrest, as well as intracranial hemorrhage of any type (such as epidural, subdural, subarachnoid and intracerebral), and intracranial and intravertebral lesions (such as contusion, penetration, shear, compression and laceration), as well as whiplash and shaken infant syndrome.
- cerebral ischemia or infarction including embolic occlusion and thrombotic occlusion, reperfusion following acute ischemia, perinatal hypoxic-ischemic injury, cardiac arrest, as well as intracranial hemorrhage of any type (such as epidural, subdural, subarachnoid and intracerebral), and intracranial and intravertebral lesions (such as contusion, penetration, shear, compression and laceration), as well
- Chronic neurodegenerative conditions include, but are not limited to, Alzheimer's disease, Pick's disease, diffuse Lewy body disease, progressive supranuclear palsy (Steel-Richardson syndrome), multisystem degeneration (Shy-Drager syndrome), chronic epileptic conditions associated with neurodegeneration, motor neuron diseases including amyotrophic lateral sclerosis, degenerative ataxias, cortical basal degeneration, ALS-Parkinson's-Dementia complex of Guam, subacute sclerosing panencephalitis, Huntington's disease, Parkinson's disease, synucleinopathies (including multiple system atrophy), primary progressive aphasia, striatonigral degeneration, Machado- Joseph disease / spinocerebellar ataxia type 3 and olivopontocerebellar degenerations, Gilles De La Tourette's disease, bulbar and pseudobulbar palsy, spinal and spinobulbar muscular atrophy (Kennedy's disease), primary lateral sclerosis
- neurodegenerative conditions include tumors and other neoplastic conditions affecting the CNS and PNS. Though the underlying disease is considered proliferative (rather than neurodegenerative), surrounding tissues may be compromised. Furthermore, cell therapy may be utilized to deliver apoptotic or other antineoplastic molecules to the tumor site, e.g., via delivery of genetically modified cells producing such agents.
- neurodegenerative conditions include various neuropathies, such as multifocal neuropathies, sensory neuropathies, motor neuropathies, sensory-motor neuropathies, infection- related neuropathies, autonomic neuropathies, sensory-autonomic neuropathies, demyelinating neuropathies (including, but not limited to, Guillain-Barre syndrome and chronic inflammatory demyelinating polyradiculoneuropathy), other inflammatory and immune neuropathies, neuropathies induced by drugs, neuropathies induced by pharmacological treatments, neuropathies induced by toxins, traumatic neuropathies (including, but not limited to, compression, crush, laceration and segmentation neuropathies), metabolic neuropathies, endocrine and paraneoplastic neuropathies, among others.
- demyelinating neuropathies including, but not limited to, Guillain-Barre syndrome and chronic inflammatory demyelinating polyradiculoneuropathy
- neuropathies induced by drugs include, but not limited to, Guillain-Barre syndrome and chronic
- neurodegenerative conditions include dementias, regardless of underlying etiology, including age-related dementia and other dementias and conditions with memory loss including dementia associated with Alzheimer's disease, vascular dementia, diffuse white matter disease (Binswanger's disease), dementia of endocrine or metabolic origin, dementia of head trauma and diffuse brain damage, dementia pugilistica and frontal lobe dementia.
- the term treating (or treatment of) a neurodegenerative condition refers to ameliorating the effects of, or delaying, halting or reversing the progress of, or delaying or preventing the onset of, a neurodegenerative condition as defined herein.
- an effective amount refers to a concentration or amount of a reagent or pharmaceutical composition, such as a growth factor, differentiation agent, trophic factor, cell population or other agent, that is effective for producing an intended result, including cell growth and/or differentiation in vitro or in vivo, or treatment of a neurodegenerative condition as described herein.
- a reagent or pharmaceutical composition such as a growth factor, differentiation agent, trophic factor, cell population or other agent, that is effective for producing an intended result, including cell growth and/or differentiation in vitro or in vivo, or treatment of a neurodegenerative condition as described herein.
- growth factors an effective amount may range from about 1 nanogram/milliliter to about 1 microgram/milliliter.
- PPDCs as administered to a patient in vivo
- an effective amount may range from as few as several hundred or fewer to as many as several million or more.
- an effective amount may range from 10 3 -10 n , more specifically at least about 10 4 cells.
- the number of cells to be administered will vary depending on the specifics of the disorder to be treated, including but not limited to size or total volume/surface area to be treated, as well as proximity of the site of administration to the location of the region to be treated, among other factors familiar to the medicinal biologist.
- effective period (or time) and effective conditions refer to a period of time or other controllable conditions (e.g., temperature, humidity for in vitro methods), necessary or preferred for an agent or pharmaceutical composition to achieve its intended result.
- patient or subject refers to animals, including mammals, preferably humans, who are treated with the pharmaceutical compositions or in accordance with the methods described herein.
- pharmaceutically acceptable carrier refers to reagents, cells, compounds, materials, compositions, and/or dosage forms that are not only compatible with the cells and other agents to be administered therapeutically, but also are, within the scope of sound medical judgment, suitable for use in contact with the tissues of human beings and animals without excessive toxicity, irritation, allergic response, or other complication commensurate with a reasonable benefit risk ratio.
- pharmaceutically acceptable carriers suitable for use in the present invention include liquids, semi-solid (e.g., gels) and solid materials (e.g., cell scaffolds and matrices, tubes sheets and other such materials as known in the art and described in greater detail herein).
- biodegradable materials may be designed to resist degradation within the body (non-biodegradable) or they may be designed to degrade within the body (biodegradable, bioerodable).
- a biodegradable material may further be bioresorbable or bioabsorbable, i.e., it may be dissolved and absorbed into bodily fluids (water-soluble implants are one example), or degraded and ultimately eliminated from the body, either by conversion into other materials or breakdown and elimination through natural pathways.
- Several terms are used herein with respect to cell replacement therapy.
- autologous transfer, autologous transplantation, autograft and the like refer to treatments wherein the cell donor is also the recipient of the cell replacement therapy.
- allogeneic transfer allogeneic transplantation, allograft and the like refer to treatments wherein the cell donor is of the same species as the recipient of the cell replacement therapy, but is not the same individual.
- a cell transfer in which the donor's cells and have been histocompatibly matched with a recipient is sometimes referred to as a syngeneic transfer.
- xenogeneic transfer, xenogeneic transplantation, xenograft and the like refer to treatments wherein the cell donor is of a different species than the recipient of the cell replacement therapy.
- Neurodegenerative conditions which encompass acute, chronic and progressive disorders and diseases having widely divergent causes, have as a common feature the dysfunction or loss of a specific or vulnerable group of neural cells. This commonality enables development of similar therapeutic approaches for the repair and regeneration of vulnerable or damaged neural tissue, one of which is cell-based therapy.
- the present invention features methods and pharmaceutical compositions for neural repair and regeneration that utilize progenitor cells and cell populations derived from postpartum tissues.
- the invention is applicable to any neurodegenerative condition, but is expected to be particularly suitable for a number of neural disorders for which treatment or cure heretofore has been difficult or unavailable.
- the invention in one of its aspects is generally directed to isolated postpartum-derived cells (PPDCs), which are derived from placental or umbilical cord tissue that has been rendered substantially free of blood.
- PPDCs are capable of self-renewal and expansion in culture and have the potential to differentiate into cells of neural phenotypes.
- Certain embodiments features populations comprising such cells, pharmaceutical compositions comprising the cells or components or products thereof, and methods of using the pharmaceutical compositions for treatment of patients with acute or chronic neurodegenerative conditions.
- the postpartum-derived cells have been characterized by their growth properties in culture, by their cell surface markers, by their gene expression, by their ability to produce certain biochemical trophic factors, and by their immunological properties.
- Preparation of PPDCs According to the methods described herein, a mammalian placenta and umbilical cord are recovered upon or shortly after termination of either a full-term or pre-term pregnancy, for example, after expulsion after birth.
- the postpartum tissue may be transported from the birth site to a laboratory in a sterile container such as a flask, beaker, culture dish, or bag.
- the container may have a solution or medium, including but not limited to a salt solution, such as, for example, Dulbecco's Modified Eagle's Medium (DMEM) or phosphate buffered saline (PBS), or any solution used for transportation of organs used for transplantation, such as University of Wisconsin solution or perfluorochemical solution.
- a salt solution such as, for example, Dulbecco's Modified Eagle's Medium (DMEM) or phosphate buffered saline (PBS), or any solution used for transportation of organs used for transplantation, such as University of Wisconsin solution or perfluorochemical solution.
- DMEM Dulbecco's Modified Eagle's Medium
- PBS phosphate buffered saline
- antibiotic and/or antimycotic agents such as but not limited to penicillin, streptomycin, amphotericin B, gentamicin, and nystatin, may be added to the medium or buffer.
- the postpartum tissue may be rinse
- the tissue not be frozen prior to extraction of PPDCs. Isolation of PPDCs preferably occurs in an aseptic environment.
- the umbilical cord may be separated from the placenta by means known in the art. Alternatively, the umbilical cord and placenta are used without separation. Blood and debris are preferably removed from the postpartum tissue prior to isolation of PPDCs.
- the postpartum tissue may be washed with buffer solution, such as but not limited to phosphate buffered saline.
- the wash buffer also may comprise one or more antimycotic and/or antibiotic agents, such as but not limited to penicillin, streptomycin, amphotericin B, gentamicin, and nystatin.
- Postpartum tissue comprising a whole placenta or a fragment or section thereof is disaggregated by mechanical force (mincing or shear forces).
- the isolation procedure also utilizes an enzymatic digestion process.
- Many enzymes are known in the art to be useful for the isolation of individual cells from complex tissue matrices to facilitate growth in culture. Ranging from weakly digestive (e.g. deoxyribonucleases and the neutral protease, dispase) to strongly digestive (e.g. papain and trypsin), such enzymes are available commercially.
- a nonexhaustive list of enzymes compatible herewith includes mucolytic enzyme activities, metalloproteases, neutral proteases, serine proteases (such as trypsin, chymotrypsin, or elastase), and deoxyribonucleases.
- enzyme activities selected from metalloproteases, neutral proteases and mucolytic activities.
- collagenases are known to be useful for isolating various cells from tissues.
- Deoxyribonucleases can digest single-stranded DNA and can minimize cell-clumping during isolation.
- Preferred methods involve enzymatic treatment with for example collagenase and dispase, or collagenase, dispase, and hyaluronidase, and such methods are provided wherein in certain preferred embodiments, a mixture of collagenase and the neutral protease dispase are used in the dissociating step. More preferred are those methods which employ digestion in the presence of at least one collagenase from Clostridium histolyticum, and either of the protease activities, dispase and thermolysin. Still more preferred are methods employing digestion with both collagenase and dispase enzyme activities. Also preferred are methods which include digestion with a hyaluronidase activity in addition to collagenase and dispase activities.
- enzyme treatments are known in the art for isolating cells from various tissue sources.
- the LIBERASE Blendzyme (Roche) series of enzyme combinations are suitable for use in the instant methods.
- Other sources of enzymes are known, and the skilled artisan may also obtain such enzymes directly from their natural sources.
- the skilled artisan is also well-equipped to assess new, or additional enzymes or enzyme combinations for their utility in isolating the cells of the invention.
- Preferred enzyme treatments are 0.5, 1, 1.5, or 2 hours long or longer.
- the tissue is incubated at 37°C during the enzyme treatment of the dissociation step.
- postpartum tissue is separated into sections comprising various aspects of the tissue, such as neonatal, neonatal/maternal, and maternal aspects of the placenta, for instance.
- the separated sections then are dissociated by mechanical and/or enzymatic dissociation according to the methods described herein.
- Cells of neonatal or maternal lineage may be identified by any means known in the art, for example, by karyotype analysis or in situ hybridization for a Y chromosome. Isolated cells or postpartum tissue from which PPDCs grow out may be used to initiate, or seed, cell cultures.
- Isolated cells are transferred to sterile tissue culture vessels either uncoated or coated with extracellular matrix or ligands such as laminin, collagen (native, denatured or crosslinked), gelatin, fibronectin, and other extracellular matrix proteins.
- PPDCs are cultured in any culture medium capable of sustaining growth of the cells such as, but not limited to, DMEM (high or low glucose), advanced DMEM, DMEM/MCDB 201, Eagle's basal medium, Ham's F10 medium (F10), Ham's F-12 medium (F12), Iscove's modified Dulbecco's medium, Mesenchymal Stem Cell Growth Medium (MSCGM), DMEM/F12, RPMI 1640, and CELL-GRO-FREE.
- DMEM high or low glucose
- advanced DMEM DMEM/MCDB 201
- Eagle's basal medium Eagle's basal medium
- Ham's F10 medium (F10) Ham's F-12 medium (F12)
- the culture medium may be supplemented with one or more components including, for example, fetal bovine serum (FBS), preferably about 2-15% (v/v); equine serum (ES); human serum(HS); beta-mercaptoethanol (BME or 2-ME), preferably about 0.001% (v/v); one or more growth factors, for example, platelet-derived growth factor (PDGF), epidermal growth factor (EGF), fibroblast growth factor (FGF), vascular endothelial growth factor (VEGF), insulin-like growth factor- 1 (IGF-1), leukocyte inhibitory factor (LIF) and erythropoietin; amino acids, including L-valine; and one or more antibiotic and/or antimycotic agents to control microbial contamination, such as, for example, penicillin G, streptomycin sulfate, amphotericin B, gentamicin, and nystatin, either alone or in combination.
- FBS fetal bovine serum
- ES equine serum
- the culture medium preferably comprises Growth Medium (DMEM-low glucose, serum, BME, and an antibiotic agent).
- the cells are seeded in culture vessels at a density to allow cell growth.
- the cells are cultured at about 0 to about 5 percent by volume CO 2 in air.
- the cells are cultured at about 2 to about 25 percent O 2 in air, preferably about 5 to about 20 percent O 2 in air.
- the cells preferably are cultured at about 25 to about 40°C and more preferably are cultured at 37°C.
- the cells are preferably cultured in an incubator.
- the medium in the culture vessel can be static or agitated, for example, using a bioreactor.
- PPDCs preferably are grown under low oxidative stress (e.g., with addition of glutathione, Vitamin C, Catalase, Vitamin E, N-Acetylcysteine).
- Low oxidative stress refers to conditions of no or minimal free radical damage to the cultured cells.
- PPDCs are passaged, or removed to a separate culture vessel containing fresh medium of the same or a different type as that used initially, where the population of cells can be mitotically expanded.
- the cells of the invention may be used at any point between passage 0 and senescence.
- the cells preferably are passaged between about 3 and about 25 times, more preferably are passaged about 4 to about 12 times, and preferably are passaged 10 or 11 times. Cloning and/or subcloning may be performed to confirm that a clonal population of cells has been isolated.
- the different cell types present in postpartum tissue are fractionated into subpopulations from which the PPDCs can be isolated.
- This may be accomplished using standard techniques for cell separation including, but not limited to, enzymatic treatment to dissociate postpartum tissue into its component cells, followed by cloning and selection of specific cell types, for example but not limited to selection based on morphological and/or biochemical markers; selective growth of desired cells (positive selection), selective destruction of unwanted cells (negative selection); separation based upon differential cell agglutinability in the mixed population as, for example, with soybean agglutinin; freeze- thaw procedures; differential adherence properties of the cells in the mixed population; filtration; conventional and zonal centrifugation; centrifugal elutriation (counter-streaming centrifugation); unit gravity separation; countercurrent distribution; electrophoresis; and fluorescence activated cell sorting (FACS).
- FACS fluorescence activated cell sorting
- the culture medium is changed as necessary, for example, by carefully aspirating the medium from the dish, for example, with a pipette, and replenishing with fresh medium. Incubation is continued until a sufficient number or density of cells accumulate in the dish.
- the original explanted tissue sections may be removed and the remaining cells trypsinized using standard techniques or using a cell scraper. After trypsinization, the cells are collected, removed to fresh medium and incubated as above.
- the medium is changed at least once at approximately 24 hours post-trypsinization to remove any floating cells.
- the cells remaining in culture are considered to be PPDCs.
- PPDCs may be cryopreserved. Accordingly, in a preferred embodiment described in greater detail below, PPDCs for autologous transfer (for either the mother or child) may be derived from appropriate postpartum tissues following the birth of a child, then cryopreserved so as to be available in the event they are later needed for transplantation.
- Characteristics of PPDCs may be characterized, for example, by growth characteristics (e.g., population doubling capability, doubling time, passages to senescence), karyotype analysis (e.g., normal karyotype; maternal or neonatal lineage), flow cytometry (e.g., FACS analysis), immunohistochemistry and/or immunocytochemistry (e.g., for detection of epitopes), gene expression profiling (e.g., gene chip arrays; polymerase chain reaction (for example, reverse transcriptase PCR, real time PCR, and conventional PCR)), protein arrays, protein secretion (e.g., by plasma clotting assay or analysis of PDC-conditioned medium, for example, by Enzyme Linked ImmunoSorbent Assay (ELISA)), mixed lymphocyte reaction (e.g., as measure of stimulation of PBMCs), and/or other methods known in the art.
- growth characteristics e.g., population doubling capability, doubling time, passages to
- Examples of PPDCs derived from placental tissue were deposited with the American Type Culture Collection (ATCC, Manassas, VA) and assigned ATCC Accession Numbers as follows: (1) strain designation PLA 071003 (P8) was deposited June 15, 2004 and assigned Accession No. PTA-6074; (2) strain designation PLA 071003 (Pl l) was deposited June 15 , 2004 and assigned Accession No. PTA-6075; and (3) strain designation PLA 071003 (P16) was deposited June 16, 2004 and assigned Accession No. PTA-6079.
- Examples of PPDCs derived from umbilicus tissue were deposited with the American Type Culture Collection on June 10, 2004, and assigned ATCC Accession Numbers as follows: (1) strain designation UMB 022803 (P7) was assigned Accession No.
- the PPDCs possess one or more of the following growth features (1) they require L-valine for growth in culture; (2) they are capable of growth in atmospheres containing oxygen from about 5% to at least about 20% (3) they have the potential for at least about 40 doublings in culture before reaching senescence; and (4) they attach and expand on a coated or uncoated tissue culture vessel, wherein the coated tissue culture vessel comprises a coating of gelatin, laminin, collagen, polyomithine, vitronectin or fibronectin.
- the PPDCs possess a normal karyotype, which is maintained as the cells are passaged.
- Karyotyping is particularly useful for identifying and distinguishing neonatal from maternal cells derived from placenta. Methods for karyotyping are available and known to those of skill in the art.
- the PPDCs may be characterized by production of certain proteins, including (1) production of at least one of tissue factor, vimentin, and alpha-smooth muscle actin; and (2) production of at least one of CD10, CD13, CD44, CD73, CD90, PDGFr-alpha, PD-L2 and HLA-A,B,C cell surface markers, as detected by flow cytometry.
- the PPDCs may be characterized by lack of production of at least one of CD31, CD34, CD45, CD80, CD86, CD117, CD141, CD178, B7-H2, HLA-G, and HLA-DR,DP,DQ cell surface markers, as detected by flow cytometry.
- Particularly preferred are cells that produce at least two of tissue factor, vimentin, and alpha-smooth muscle actin. More preferred are those cells producing all three of the proteins tissue factor, vimentin, and alpha-smooth muscle actin.
- the PPDCs may be characterized by gene expression, which relative to a human cell that is a fibroblast, a mesenchymal stem cell, or an ileac crest bone marrow cell, is increased for a gene encoding at least one of interleukin 8; reticulon 1; chemokine (C-X-C motif) ligand 1 (melonoma growth stimulating activity, alpha); chemokine (C-X-C motif) ligand 6 (granulocyte chemotactic protein 2); chemokine (C-X-C motif) ligand 3; tumor necrosis factor, alpha-induced protein 3; C-type lectin superfamily member 2; Wilms tumor 1; aldehyde dehydrogenase 1 family member A2; renin; oxidized low density lipoprotein receptor 1; Homo sapiens clone IMAGE:4179671; protein kinase C zeta; hypothetical protein DKFZp56
- the PPDCs may be characterized by gene expression, which relative to a human cell that is a fibroblast, a mesenchymal stem cell, or an ileac crest bone marrow cell, is reduced for a gene encoding at least one of: short stature homeobox 2; heat shock 27 kDa protein 2; chemokine (C-X-C motif) ligand 12 (stromal cell-derived factor 1); elastin (supravalvular aortic stenosis, Williams-Beuren syndrome); Homo sapiens mRNA; cDNA DKFZp586M2022 (from clone DKFZp586M2022); mesenchyme homeo box 2 (growth arrest- specific homeo box); sine oculis homeobox homolog 1 (Drosophila); crystallin, alpha B; disheveled associated activator of morphogenesis 2; DKFZP586B2420 protein; similar to neuralin
- the PPDCs may be characterized by secretion of at least one of MCP-1, EL-6, IL-8, GCP-2, HGF, KGF, FGF, HB-EGF, BDNF, TPO, MlPla, RANTES, and TIMPl.
- the PPDCs may be characterized by lack of secretion of at least one of TGF-beta2, ANG2, PDGFbb, MlPlb, 1309, MDC, and VEGF, as detected by ELISA.
- the cell comprises two or more of the above-listed growth, protein/surface marker production, gene expression or substance-secretion characteristics.
- cells comprising, three, four, or five or more of the characteristics. Still more preferred are PPDCs comprising six, seven, or eight or more of the characteristics. Still more preferred presently are those cells comprising all of above characteristics.
- postpartum cells having the characteristics described above and more particularly those wherein the cells have normal karyotypes and maintain normal karyotypes with passaging, and further wherein the cells express each of the markers CD10, CD13, CD44, CD73, CD90, PDGFr-alpha, and HLA-A,B,C, wherein the cells produce the immunologically-detectable proteins which correspond to the listed markers.
- cells which in addition to the foregoing do not produce proteins corresponding to any of the markers CD31, CD34, CD45, CD117, CD141, or HLA-DR,DP,DQ, as detected by flow cytometry.
- Certain cells having the potential to differentiate along lines leading to various phenotypes are unstable and thus can spontaneously differentiate.
- Presently preferred for use with the invention are cells that do not spontaneously differentiate, for example along neural lines.
- Preferred cells, when grown in Growth Medium are substantially stable with respect to the cell markers produced on their surface, and with respect to the expression pattern of various genes, for example as determined using an Affymetrix GENECHTP. The cells remain substantially constant, for example in their surface marker characterisitics over passaging, through multiple population doublings.
- PPDCs may be deliberately induced to differentiate into neural lineage phenotypes by subjecting them to differentiation-inducing cell culture conditions. This may be accomplished by one or more methods known in the art. For instance, as exemplified herein, PPDCs may be plated on flasks coated with laminin in Neurobasal-A medium (Invitrogen, Carlsbad, CA) containing B27 (B27 supplement, Invitrogen), L-glutamine and Penicillin/Streptomycin, the combination of which is referred to herein as Neural Progenitor Expansion (NPE) medium. NPE media may be further supplemented with bFGF and or EGF.
- NPE Neural Progenitor Expansion
- PPDCs may be induced to differentiate in vitro by (1) co-culturing the PPDCs with neural progenitor cells, or (2) growing the PPDCs in neural progenitor cell-conditioned medium. Differentiation of the PPDCs may be demonstrated by a bipolar cell morphology with extended processes. The induced cell populations may stain positive for the presence of nestin. Differentiated PPDCs may be assessed by detection of nestin, TuJl (BUI tubulin), GFAP, tyrosine hydroxylase, GABA, O4 and/or MBP. In some embodiments, PPDCs have exhibited the ability to form three-dimensional bodies characteristic of neuronal stem cell formation of neurospheres.
- the cell population is heterogeneous.
- a heterogeneous cell population of the invention may comprise at least about 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or 95% PPDCs of the invention.
- the heterogeneous cell populations of the invention may further comprise stem cells or other progenitor cells, such as neural progenitor cells, or it may further comprise fully differentiated neural cells.
- the population is substantially homogeneous, i.e., comprises substantially only PPDCs (preferably at least about 96%, 97%, 98%, 99% or more PPDCs).
- the homogeneous cell population of the invention may comprise umbilicus- or placenta-derived cells.
- Homogeneous populations of umbilicus-derived cells are preferably free of cells of maternal lineage.
- Homogeneous populations of placenta- derived cells may be of neonatal or maternal lineage.
- Homogeneity of a cell population may be achieved by any method known in the art, for example, by cell sorting (e.g., flow cytometry) or by clonal expansion in accordance with known methods.
- preferred homogeneous PPDC populations may comprise a clonal cell line of postpartum-derived cells. Such populations are particularly useful when a cell clone with highly desirable functionality has been isolated.
- populations of cells incubated in the presence of one or more factors, or under conditions, that stimulate stem cell differentiation along a neurogenic pathway are known in the art and the skilled artisan will appreciate that determination of suitable conditions for differentiation can be accomplished with routine experimentation. Optimization of such conditions can be accomplished by statistical experimental design and analysis, for example response surface methodology allows simultaneous optimization of multiple variables, for example in a biological culture.
- Presently preferred factors include, but are not limited to factors, such as growth or trophic factors, demethylating agents, co-culture with neural lineage cells or culture in neural lineage cell-conditioned medium, as well other conditions known in the art to stimulate stem cell differentiation along a neurogenic pathway or lineage (see, e.g., Lang, K.J.D.
- PPDCs may also be genetically modified to produce neurotherapeutically useful gene products, or to produce antineoplastic agents for treatment of tumors, for example.
- Genetic modification may be accomplished using any of a variety of vectors including, but not limited to, integrating viral vectors, e.g., retrovirus vector or adeno-associated viral vectors; non-integrating replicating vectors, e.g., papilloma virus vectors, SV40 vectors, adenoviral vectors; or replication-defective viral vectors.
- Other methods of introducing DNA into cells include the use of liposomes, electroporation, a particle gun, or by direct DNA injection.
- Hosts cells are preferably transformed or transfected with DNA controlled by or in operative association with, one or more appropriate expression control elements such as promoter or enhancer sequences, transcription terminators, polyadenylation sites, among others, and a selectable marker.
- any promoter may be used to drive the expression of the inserted gene.
- viral promoters include, but are not limited to, the CMV promoter/enhancer, SV 40, papillomavirus, Epstein-Barr virus or elastin gene promoter.
- the control elements used to control expression of the gene of interest can allow for the regulated expression of the gene so that the product is synthesized only when needed in vivo.
- constitutive promoters are preferably used in a non-integrating and/or replication-defective vector.
- inducible promoters could be used to drive the expression of the inserted gene when necessary.
- Inducible promoters include, but are not limited to, those associated with metallothionein and heat shock proteins.
- engineered cells may be allowed to grow in enriched media and then switched to selective media.
- the selectable marker in the foreign DNA confers resistance to the selection and allows cells to stably integrate the foreign DNA as, for example, on a plasmid, into their chromosomes and grow to form foci which, in turn, can be cloned and expanded into cell lines. This method can be advantageously used to engineer cell lines that express the gene product.
- the cells of the invention may be genetically engineered to "knock out” or “knock down” expression of factors that promote inflammation or rejection at the implant site.
- Negative modulatory techniques for the reduction of target gene expression levels or target gene product activity levels are discussed below.
- Negative modulation refers to a reduction in the level and or activity of target gene product relative to the level and/or activity of the target gene product in the absence of the modulatory treatment.
- the expression of a gene native to a neuron or glial cell can be reduced or knocked out using a number of techniques including, for example, inhibition of expression by inactivating the gene using the homologous recombination technique.
- an exon encoding an important region of the protein is interrupted by a positive selectable marker, e.g., neo, preventing the production of normal mRNA from the target gene and resulting in inactivation of the gene.
- a gene may also be inactivated by creating a deletion in part of a gene, or by deleting the entire gene. By using a construct with two regions of homology to the target gene that are far apart in the genome, the sequences intervening the two regions can be deleted (Mombaerts et al., 1991, Proc. Nat. Acad. Sci. U.S.A. 88:3084).
- Antisense, DNAzymes, ribozymes, small interfering RNA (siRNA) and other such molecules that inhibit expression of the target gene can also be used to reduce the level of target gene activity.
- antisense RNA molecules that inhibit the expression of major histocompatibility gene complexes (HLA) have been shown to be most versatile with respect to immune responses.
- triple helix molecules can be utilized in reducing the level of target gene activity.
- the invention provides cell lysates and cell soluble fractions prepared from PPDCs, or heterogeneous or homogeneous cell populations comprising PPDCs, as well as PPDCs or populations thereof that have been genetically modified or that have been stimulated to differentiate along a neurogenic pathway.
- PPDC lysate soluble fraction i.e., substantially free of membranes
- lysing cells are well-known in the art and include various means of mechanical disruption, enzymatic disruption, or chemical disruption, or combinations thereof.
- Such cell lysates may be prepared from cells directly in their Growth Medium and thus containing secreted growth factors and the like, or may be prepared from cells washed free of medium in, for example, PBS or other solution. Washed cells may be resuspended at concentrations greater than the original population density if preferred.
- whole cell lysates are prepared, e.g., by disrupting cells without subsequent separation of cell fractions.
- a cell membrane fraction is separated from a soluble fraction of the cells by routine methods known in the art, e.g., centrifugation, filtration, or similar methods.
- Cell lysates or cell soluble fractions prepared from populations of postpartum-derived cells may be used as is, further concentrated, by for example, ultrafiltration or lyophilization, or even dried, partially purified, combined with pharmaceutically-acceptable carriers or diluents as are known in the art, or combined with other compounds such as biologicals, for example pharmaceutically useful protein compositions.
- Cell lysates or fractions thereof may be used in vitro or in vivo, alone or for example, with autologous or syngeneic live cells.
- the lysates, if introduced in vivo may be introduced locally at a site of treatment, or remotely to provide, for example needed cellular growth factors to a patient.
- PPDCs can be cultured in vitro to produce biological products in high yield.
- such cells which either naturally produce a particular biological product of interest (e.g., a trophic factor), or have been genetically engineered to produce a biological product, can be clonally expanded using the culture techniques described herein.
- cells may be expanded in a medium that induces differentiation to a neural lineage.
- biological products produced by the cell and secreted into the medium can be readily isolated from the conditioned medium using standard separation techniques, e.g., such as differential protein precipitation, ion-exchange chromatography, gel filtration chromatography, electrophoresis, and HPLC, to name a few.
- a "bioreactor” may be used to take advantage of the flow method for feeding, for example, a three-dimensional culture in vitro. Essentially, as fresh media is passed through the three-dimensional culture, the biological product is washed out of the culture and may then be isolated from the outflow, as above. Alternatively, a biological product of interest may remain within the cell and, thus, its collection may require that the cells be lysed, as described above. The biological product may then be purified using any one or more of the above-listed techniques. In other embodiments, the invention provides conditioned medium from cultured PPDCs for use in vitro and in vivo as described below.
- Conditioned medium is prepared by culturing cells in a culture medium, then removing the cells from the medium.
- Conditioned medium prepared from populations of postpartum-derived cells may be used as is, further concentrated, by for example, ultrafiltration or lyophilization, or even dried, partially purified, combined with pharmaceutically-acceptable carriers or diluents as are known in the art, or combined with other compounds such as biologicals, for example pharmaceutically useful protein compositions.
- Conditioned medium may be used in vitro or in vivo, alone or for example, with autologous or syngeneic live cells.
- the conditioned medium if introduced in vivo, may be introduced locally at a site of treatment, or remotely to provide, for example needed cellular growth or trophic factors to a patient.
- an extracellular matrix (ECM) produced by culturing PPDCs on liquid, solid or semi-solid substrates is prepared, collected and utilized as an alternative to implanting live cells into a subject in need of tissue repair or replacement.
- PPDCs are cultured in vitro, on a three dimensional framework as described elsewhere herein, under conditions such that a desired amount of ECM is secreted onto the framework.
- the comprising the new tissue are removed, and the ECM processed for further use, for example, as an injectable preparation.
- cells on the framework are killed and any cellular debris removed from the framework.
- This process may be carried out in a number of different ways.
- the living tissue can be flash-frozen in liquid nitrogen without a cryopreservative, or the tissue can be immersed in sterile distilled water so that the cells burst in response to osmotic pressure.
- the cellular membranes may be disrupted and cellular debris removed by treatment with a mild detergent rinse, such as EDTA, CHAPS or a zwitterionic detergent.
- the tissue can be enzymatically digested and/or extracted with reagents that break down cellular membranes and allow removal of cell contents.
- reagents that break down cellular membranes and allow removal of cell contents.
- enzymes include, but are not limited to, hyaluronidase, dispase, proteases, and nucleases.
- detergents include non-ionic detergents such as, for example, alkylaryl polyether alcohol (TRITON X-100), octylphenoxy polyethoxy-ethanol (Rohm and Haas Philadelphia, PA), BRLT-35, a polyethoxyethanol lauryl ether (Atlas Chemical Co., San Diego, CA), polysorbate 20 (TWEEN 20), a polyethoxyethanol sorbitan monolaureate (Rohm and Haas), polyethylene lauryl ether (Rohm and Haas); and ionic detergents such as, for example, sodium dodecyl sulphate, sulfated higher aliphatic alcohols, sulfonated alkanes and sulfonated alkylarenes containing 7 to 22 carbon atoms in a branched or unbranched chain.
- non-ionic detergents such as, for example, alkylaryl polyether alcohol (TRITON X-100), octy
- the collection of the ECM can be accomplished in a variety of ways, depending, for example, on whether the new tissue has been formed on a three-dimensional framework that is biodegradable or non-biodegradable.
- the framework is non-biodegradable
- the ECM can be removed by subjecting the framework to sonication, high pressure water jets, mechanical scraping, or mild treatment with detergents or enzymes, or any combination of the above.
- the framework is biodegradable
- the ECM can be collected, for example, by allowing the framework to degrade or dissolve in solution.
- the biodegradable framework is composed of a material that can itself be injected along with the ECM, the framework and the ECM can be processed in toto for subsequent injection.
- the ECM can be removed from the biodegradable framework by any of the methods described above for collection of ECM from a non-biodegradable framework. All collection processes are preferably designed so as not to denature the ECM. After it has been collected, the ECM may be processed further. For example, the ECM can be homogenized to fine particles using techniques well known in the art such as by sonication, so that it can pass through a surgical needle. The components of the ECM can be crosslinked, if desired, by gamma irradiation. Preferably, the ECM can be irradiated between 0.25 to 2 mega rads to sterilize and crosslink the ECM.
- the amounts and/or ratios of proteins, such as the various types of collagen present in the ECM, may be adjusted by mixing the ECM produced by the cells of the invention with ECM of one or more other cell types.
- biologically active substances such as proteins, growth factors and/or drugs, can be incorporated into the ECM.
- tissue growth factors such as TGF-beta, and the like, which promote healing and tissue repair at the site of the injection.
- additional agents may be utilized in any of the embodiments described herein above, e.g., with whole cell lysates, soluble cell fractions, or further purified components and products produced by the PPDCs.
- compositions comprising PPDCs, PPDC components or products
- the invention provides pharmaceutical compositions that utilize the PPDCs, PPDC populations, components and products of PPDCs in various methods for treatment of neurodegenerative conditions.
- Certain embodiments encompass pharmaceutical compositions comprising live cells (PPDCs alone or admixed with other cell types).
- Other embodiments encompass pharmaceutical compositions comprising PPDC cellular components (e.g., cell lysates, soluble cell fractions, conditioned medium, ECM, or components of any of the foregoing) or products (e.g., trophic and other biological factors produced naturally by PPDCs or through genetic modification, conditioned medium from PPDC culture).
- the pharmaceutical composition may further comprise other active agents, such as anti-inflammatory agents, anti-apoptotic agents, antioxidants, growth factors, neurotrophic factors or neuroregenerative or neuroprotective drugs as known in the art.
- active agents such as anti-inflammatory agents, anti-apoptotic agents, antioxidants, growth factors, neurotrophic factors or neuroregenerative or neuroprotective drugs as known in the art.
- other components include, but are not limited to: (1) other neuroprotective or neurobeneficial drugs; (2) selected extracellular matrix components, such as one or more types of collagen known in the art, and/or growth factors, platelet-rich plasma, and drugs (alternatively, PPDCs may be genetically engineered to express and produce growth factors); (3) anti-apoptotic agents (e.g., erythropoietin (EPO), EPO mimetibody, thrombopoietin, insulin-like growth factor (IGF)-I, IGF-II, hepatocyte growth factor, caspase inhibitors); (4) anti-inflammatory
- compositions of the invention comprise PPDCs, or components or products thereof, formulated with a pharmaceutically acceptable carrier or medium.
- suitable pharmaceutically acceptable carriers include water, salt solution (such as Ringer's solution), alcohols, oils, gelatins, and carbohydrates, such as lactose, amylose, or starch, fatty acid esters, hydroxymethylcellulose, and polyvinyl pyrolidine.
- Such preparations can be sterilized, and if desired, mixed with auxiliary agents such as lubricants, preservatives, stabilizers, wetting agents, emulsifiers, salts for influencing osmotic pressure, buffers, and coloring.
- compositions comprising PPDC components or products, but not live cells are formulated as liquids (or as solid tablets, capsules and the like, when oral delivery is appropriate). These may be formulated for administration by any acceptable route known in the art to achieve delivery of drugs and biological molecules to the target neural tissue, including, but not limited to, oral, nasal, ophthalmic and parenteral, including intravenous.
- compositions comprising PPDC live cells are typically formulated as liquids, semisolids (e.g., gels) or solids (e.g., matrices, scaffolds and the like, as appropriate for neural tissue engineering). Liquid compositions are formulated for administration by any acceptable route known in the art to achieve delivery of live cells to the target neural tissues.
- these include injection or infusion into the CNS or PNS, either in a diffuse fashion or targeted to the site of neurological disease or distress, by a route of administration including, but not limited to, intraocular, intracerebral, intraventricular, intracerebroventricular, intrathecal, intracistemal, intraspinal and/or peri-spinal routes of administration by delivery via intracranial or intravertebral needles and/or catheters with or without pump devices.
- Pharmaceutical compositions comprising live cells in a semi-solid or solid carrier are typically formulated for surgical implantation at the site of neurological damage or distress. It will be appreciated that liquid compositions also may be administered by surgical procedures.
- semi-solid or solid pharmaceutical compositions may comprise semi- permeable gels, lattices, cellular scaffolds and the like, which may be non-biodegradable or biodegradable.
- semi-permeable gels lattices, cellular scaffolds and the like, which may be non-biodegradable or biodegradable.
- it may be desirable or appropriate to sequester the exogenous cells from their surroundings, yet enable the cells to secrete and deliver biological molecules (e.g. neurotrophic factors) to surrounding neural cells.
- cells may be formulated as autonomous implants comprising living PPDCs or cell population comprising PPDCs surrounded by a non-degradable, selectively permeable barrier that physically separates the transplanted cells from host tissue.
- Such implants are sometimes referred to as “immunoprotective,” as they have the capacity to prevent immune cells and macromolecules from killing the transplanted cells in the absence of pharmacologically induced immunosuppression (for a review of such devices and methods, see, e.g., P.A. Tresco et al., 2000, Adv. Drug Delivery Rev. 42: 3-27).
- degradable materials particularly suitable for sustained release formulations include biocompatible polymers, such as poly(lactic acid), poly (lactic-co-glycolic acid), methylcellulose, hyaluronic acid, collagen, and the like.
- degradable polymers in drug delivery vehicles have been reviewed in several publications, including, A. Domb et al., 1992, Polymers for Advanced Technologies 3:279.
- biodegradable, preferably bioresorbable or bioabsorbable, scaffold or matrix typically three-dimensional biomaterials contain the living cells attached to the scaffold, dispersed within the scaffold, or incorporated in an extracellular matrix entrapped in the scaffold.
- scaffold or matrix (sometimes referred to collectively as "framework") material that may be used in the present invention include nonwoven mats, porous foams, or self assembling peptides.
- Nonwoven mats may, for example, be formed using fibers comprised of a synthetic absorbable copolymer of glycolic and lactic acids (PGA PLA), sold under the tradename VICRYL (Ethicon, Inc., Somerville, NJ), Foams, composed of, for example, poly(epsilon-caprolactone)/poly(glycolic acid) (PCL/PGA) copolymer, formed by processes such as freeze-drying, or lyophilized, as discussed in U.S. Patent No. 6,355,699, also may be utilized. Hydrogels such as self-assembling peptides (e.g., RAD16) may also be used.
- PGA PLA synthetic absorbable copolymer of glycolic and lactic acids
- VICRYL Ethicon, Inc., Somerville, NJ
- Foams composed of, for example, poly(epsilon-caprolactone)/poly(glycolic acid) (PCL/PGA) copolymer, formed by processes
- degradable networks are also suitable for use in the invention (see, e.g., Anseth, K.S. et al., 2002, J. Controlled Release 78: 199-209; Wang, D. et al., 2003, Biomaterials 24: 3969-3980; U.S. Patent Publication 2002/0022676 to He et al.).
- These materials are formulated as fluids suitable for injection, then may be induced by a variety of means (e.g., change in temperature, pH, exposure to light) to form degradable hydrogel networks in situ or in vivo.
- the framework is a felt, which can be composed of a multifilament yam made from a bioabsorbable material, e.g., PGA, PLA, PCL copolymers or blends, or hyaluronic acid.
- the yam is made into a felt using standard textile processing techniques consisting of crimping, cutting, carding and needling.
- cells are seeded onto foam scaffolds that may be composite structures.
- the framework may be molded into a useful shape, such as that of the spinal cord with segregated columns for nerve tract repair, for example (Friedman JA et al., 2002, Neurosurgery 51: 742-51).
- PPDCs may be cultured on pre-formed, non-degradable surgical or implantable devices, e.g., in a manner corresponding to that used for preparing fibroblast-containing GDC endovascular coils, for instance (Marx, W.F. et al., 2001, Am. J. Neuroradiol. 22: 323-333).
- the matrix, scaffold or device may be treated prior to inoculation of cells in order to enhance cell attachment.
- nylon matrices can be treated with 0.1 molar acetic acid and incubated in polylysine, PBS, and/or collagen to coat the nylon.
- Polystyrene can be similarly treated using sulfuric acid.
- the external surfaces of a framework may also be modified to improve the attachment or growth of cells and differentiation of tissue, such as by plasma coating the framework or addition of one or more proteins (e.g., collagens, elastic fibers, reticular fibers), glycoproteins, glycosaminoglycans (e.g., heparin sulfate, chondroitin-4-sulfate, chondroitin-6-sulfate, dermatan sulfate, keratin sulfate), a cellular matrix, and or other materials such as, but not limited to, gelatin, alginates, agar, agarose, and plant gums, among others.
- proteins e.g., collagens, elastic fibers, reticular fibers
- glycoproteins e.g., glycoproteins, glycosaminoglycans (e.g., heparin sulfate, chondroitin-4-sulfate, chondroitin-6-sulfate, dermatan
- cells can be grown freely in a culture vessel to sub-confluency or confluency, lifted from the culture and inoculated onto the framework.
- Growth factors may be added to the culture medium prior to, during, or subsequent to inoculation of the cells to trigger differentiation and tissue formation, if desired.
- the frameworks themselves may be modified so that the growth of cells thereon is enhanced, or so that the risk of rejection of the implant is reduced.
- one or more biologically active compounds including, but not limited to, anti- inflammatories, immunosuppressants or growth factors, may be added to the framework for local release.
- PPDCs may be used in a variety of ways to support and facilitate repair and regeneration of neural cells and tissues. Such utilities encompass in vitro, ex vivo and in vivo methods. In vitro and ex vivo methods: In one embodiment, PPDCs may be used in vitro to screen a wide variety of compounds for effectiveness and cytotoxicity of pharmaceutical agents, growth factors, regulatory factors, and the like.
- such screening may be performed on substantially homogeneous populations of PPDCs to assess the efficacy or toxicity of candidate compounds to be formulated with, or co-administered with, the PPDCs, for treatment of a neurodegenerative condition.
- screening may be performed on PPDCs that have been stimulated to differentiate into a neural cell or neural progenitor cell, for the purpose of evaluating the efficacy of new pharmaceutical drug candidates.
- the PPDCs are maintained in vitro and exposed to the compound to be tested.
- the activity of a potentially cytotoxic compound can be measured by its ability to damage or kill cells in culture. This may readily be assessed by vital staining techniques.
- PPDCs can be cultured in vitro to produce biological products that are either naturally produced by the cells, or produced by the cells when induced to differentiate into neural lineages, or produced by the cells via genetic modification.
- TEMPI, TPO, KGF, HGF, FGF, HBEGF, BDNF, MlPlb, MCP1, RANTES, 1309, TARC, MDC, and EL-8 were found to be secreted from umbilicus-derived cells grown in Growth Medium.
- TEMPI, TPO, KGF, HGF, HBEGF, BDNF, MlPla, MCP-1, RANTES, TARC, Eotaxin, and IL-8 were found to be secreted from placenta-derived PPDCs cultured in Growth Medium (see Examples).
- trophic factors as yet undetected or unexamined, of use in neural repair and regeneration, are likely to be produced by PPDCs and possibly secreted into the medium.
- another embodiment of the invention features use of PPDCs for production of conditioned medium, either from undifferentiated PPDCs or from PPDCs incubated under conditions that stimulate differentiation into a neural lineage.
- conditioned media are contemplated for use in in vitro or ex vivo culture of neurogeneic precursor cells, or in vivo to support transplanted cells comprising homogeneous populations of PPDCs or heterogeneous populations comprising PPDCs and neural progenitors, for example.
- Yet another embodiment comprises the use of PPCD cell lysates, soluble cell fractions or components thereof, or ECM or components thereof, for a variety of purposes. As mentioned above, some of these components may be used in pharmaceutical compositions.
- a cell lysate or ECM is used to coat or otherwise treat substances or devices to be used surgically, or for implantation, or for ex vivo purposes, to promote healing or survival of cells or tissues contacted in the course of such treatments.
- PPDCs have demonstrated the ability to support survival, growth and differentiation of adult neural progenitor cells when grown in co-culture with those cells.
- PPDCs are used advantageously in co- cultures in vitro to provide trophic support to other cells, in particular neural cells and neural progenitors.
- the PPDCs and the desired other cells may be co-cultured under conditions in which the two cell types are in contact. This can be achieved, for example, by seeding the cells as a heterogeneous population of cells in culture medium or onto a suitable culture substrate.
- the PPDCs can first be grown to confluence, and then will serve as a substrate for the second desired cell type in culture.
- the cells may further be physically separated, e.g., by a membrane or similar device, such that the other cell type may be removed and used separately, following the co-culture period.
- a membrane or similar device e.g., a membrane or similar device
- Use of PPDCs in co-culture to promote expansion and differentiation of neural cell types may find applicability in research and in clinical/therapeutic areas.
- PPDC co-culture may be utilized to facilitate growth and differentiation of neural cells in culture, for basic research purposes or for use in drug screening assays, for example.
- PPDC co-culture may also be utilized for ex vivo expansion of neural progenitors for later administration for therapeutic purposes.
- neural progenitor cells may be harvested from an individual, expanded ex vivo in co- culture with PPDCs, then returned to that individual (autologous transfer) or another individual (syngeneic or allogeneic transfer).
- autologous transfer or another individual (syngeneic or allogeneic transfer).
- the mixed population of cells comprising the PPDCs and neural progenitors could be administered to a patient in need of treatment.
- the co-cultured cell populations may be physically separated in culture, enabling removal of the autologous neural progenitors for administration to the patient.
- PPDCs have been shown to be effectively transplanted into the body, and to supply lost neural function in an animal model accepted for its predictability of efficacy in humans. These results support a preferred embodiment of the invention, wherein PPDCs are used in cell therapy for treating a neurodegenerative condition.
- PPDCs Once transplanted into a target neural location in the body, PPDCs may themselves differentiate into one or more neural phenotypes, or they may provide trophic support for neural progenitors and neural cells in situ, or they may exert a beneficial effect in both of those fashions, among others.
- PPDCs may be administered alone (e.g., as substantially homogeneous populations) or as admixtures with other cells.
- PPDCs may be administered as formulated in a pharmaceutical preparation with a matrix or scaffold, or with conventional pharmaceutically acceptable carriers. Where PPDCs are administered with other cells, they may be administered simultaneously or sequentially with the other cells (either before or after the other cells).
- Cells that may be administered in conjunction with PPDCs include, but are not limited to, neurons, astrocytes, oligodendrocytes, neural progenitor cells, neural stem cells and/or other multipotent or pluripotent stem cells.
- the cells of different types may be admixed with the PPDCs immediately or shortly prior to administration, or they may be co-cultured together for a period of time prior to administration.
- the PPDCs may be administered with other neuro-beneficial drugs or biological molecules, or other active agents, such as anti-inflammatory agents, anti-apoptotic agents, antioxidants, growth factors, neurotrophic factors or neuroregenerative or neuroprotective drugs as known in the art.
- active agents such as anti-inflammatory agents, anti-apoptotic agents, antioxidants, growth factors, neurotrophic factors or neuroregenerative or neuroprotective drugs as known in the art.
- PPDCs When PPDCs are administered with other agents, they may be administered together in a single pharmaceutical composition, or in separate pharmaceutical compositions, simultaneously or sequentially with the other agents (either before or after administration of the other agents).
- PPDCs examples include, but are not limited to: (1) other neuroprotective or neurobeneficial drugs; (2) selected extracellular matrix components, such as one or more types of collagen known in the art, and/or growth factors, platelet-rich plasma, and drugs (alternatively, PPDCs may be genetically engineered to express and produce growth factors); (3) anti-apoptotic agents (e.g., erythropoietin (EPO), EPO mimetibody, thrombopoietin, insulin-like growth factor (IGF)-I, IGF-II, hepatocyte growth factor, caspase inhibitors); (4) anti-inflammatory compounds (e.g., p38 MAP kinase inhibitors, TGF-beta inhibitors, statins, IL-6 and IL-1 inhibitors, PEMIROLAST, TRANILAST, REMICADE, SIROLEVIUS, and non-steroidal anti-inflammatory drugs (NSAIDS) (such as TEPOXALIN), EPOXALIN,
- PPDCs are administered as undifferentiated cells, i.e., as cultured in Growth Medium.
- PPDCs may be administered following exposure in culture to conditions that stimulate differentiation toward a desired neural phenotype, e.g., astrocyte, oligodendrocyte or neuron, and more specifically, serotoninergic, dopaminergic, cholinergic, GABA-ergic or glutamatergic neurons (see, e.g., Isacson, O., 2003. The Lancet (Neurology) 2: 417-424).
- the cells of the invention may be surgically implanted, injected, delivered (e.g., by way of a catheter or syringe), or otherwise administered directly or indirectly to the site of neurological damage or distress.
- Routes of administration of the cells of the invention or compositions thereof include, but are not limited to, intravenous, intramuscular, subcutaneous, intranasal, intracerebral, intraventricular, intracerebroventricular, intrathecal, intracistemal, intraspinal and/or peri-spinal routes of administration by delivery via intracranial or intravertebral needles and/or catheters with or without pump devices.
- When cells are administered in semi-solid or solid devices, surgical implantation into a precise location in the body is typically a suitable means of administration.
- Liquid or fluid pharmaceutical compositions may be administered to a more general location in the CNS or PNS (e.g., throughout a diffusely affected area, such as would be the case in Parkinson's disease or diffuse ischemic injury, for example), inasmuch as neural progenitor cells have been shown to be capable of extensive migration from a point of entry to the nervous system to a particular location, e.g., by following radial glia or by responding to chemical signals. Indeed, this migratory ability of neural stem cells has opened a new avenue for treatment of malignant brain tumors, i.e., use of progenitor cells for delivery of therapeutic genes/gene products for the treatment of these migratory tumors.
- PPDCs are also expected to be suitable for this type of use, i.e., PPDCs genetically modified to produce an apoptotic or other antineoplastic agent, e.g., IL-12 (Ehtesham, M.
- tumor necrosis factor-related apoptosis-inducing ligand may be injected or otherwise administered to a general site of a malignant tumor (e.g., glioblastoma), whereafter the PPDCs can migrate to the tumor cells for local delivery of the therapeutic agent.
- a malignant tumor e.g., glioblastoma
- compositions comprising PPDC cellular components (e.g., cell lysates or components thereof) or products (e.g., trophic and other biological factors produced naturally by PPDCs or through genetic modification, conditioned medium from PPDC culture).
- these methods may further comprise administering other active agents, such as growth factors, neurotrophic factors or neuroregenerative or neuroprotective drugs as known in the art.
- Dosage forms and regimes for administering PPDCs or any of the other pharmaceutical compositions described herein are developed in accordance with good medical practice, taking into account the condition of the individual patient, e.g., nature and extent of the neurodegenerative condition, age, sex, body weight and general medical condition, and other factors known to medical practitioners. Thus, the effective amount of a pharmaceutical composition to be administered to a patient is determined by these considerations as known in the art. Because the CNS is a somewhat immunoprivileged tissue, it may not be necessary or desirable to immunosuppress a patient prior to initiation of cell therapy with PPDCs. In addition, as set forth in Example 11, PPDCs have been shown not to stimulate allogeneic PBMCs in a mixed lymphocyte reaction.
- PPDCs transplantation with allogeneic, or even xenogeneic, PPDCs may be tolerated in some instances.
- systemic or local immunosuppressive agents or it may be accomplished by delivering the cells in an encapsulated device, as described above.
- PPDCs may be genetically modified to reduce their immunogenicity, as mentioned above.
- Survival of transplanted PPDCs in a living patient can be determined through the use of a variety of scanning techniques, e.g., computerized axial tomography (CAT or CT) scan, magnetic resonance imaging (MRI) or positron emission tomography (PET) scans. Determination of transplant survival can also be done post mortem by removing the neural tissue, and examining it visually or through a microscope. Alternatively, cells can be treated with stains that are specific for neural cells or products thereof, e.g., neurotransmitters.
- CAT or CT computerized axial tomography
- MRI magnetic resonance imaging
- PET positron emission tomography
- Transplanted cells can also be identified by prior incorporation of tracer dyes such as rhodamine- or fluorescein- labeled microspheres, fast blue, ferric microparticles, bisbenzamide or genetically introduced reporter gene products, such as beta-galactosidase or beta-glucuronidase.
- tracer dyes such as rhodamine- or fluorescein- labeled microspheres, fast blue, ferric microparticles, bisbenzamide or genetically introduced reporter gene products, such as beta-galactosidase or beta-glucuronidase.
- Functional integration of transplanted PPDCs into neural tissue of a subject can be assessed by examining restoration of the neural function that was damaged or diseased.
- Such functions include, but are not limited to motor, cognitive, sensory and endocrine functions, in accordance with procedures well known to neurobiologists and physicians.
- Kits and banks comprising PPDCs, PPDC components or products
- the invention provides kits that utilize the PPDCs, PPDC populations, components and products of PPDCs in various methods for neural regeneration and repair as described above.
- the kits may include one or more cell populations, including at least PPDCs and a pharmaceutically acceptable carrier (liquid, semi-solid or solid).
- the kits also optionally may include a means of administering the cells, for example by injection.
- the kits further may include instructions for use of the cells.
- Kits prepared for field hospital use, such as for military use may include full-procedure supplies including tissue scaffolds, surgical sutures, and the like, where the cells are to be used in conjunction with repair of acute injuries.
- Kits for assays and in vitro methods as described herein may contain one or more of (1) PPDCs or components or products of PPDCs, (2) reagents for practicing the in vitro method, (3) other cells or cell populations, as appropriate, and (4) instructions for conducting the in vitro method.
- the invention also provides for banking of tissues, cells, cellular components and cell populations of the invention. As discussed above, the cells are readily cryopreserved. The invention therefore provides methods of cryopreserving the cells in a bank, wherein the cells are stored frozen and associated with a complete characterization of the cells based on immunological, biochemical and genetic properties of the cells.
- the frozen cells can be thawed and expanded or used directly for autologous, syngeneic, or allogeneic therapy, depending on the requirements of the procedure and the needs of the patient.
- the information on each cryopreserved sample is stored in a computer, which is searchable based on the requirements of the surgeon, procedure and patient with suitable matches being made based on the characterization of the cells or populations.
- the cells of the invention are grown and expanded to the desired quantity of cells and therapeutic cell compositions are prepared either separately or as co-cultures, in the presence or absence of a matrix or support.
- the remainder can be cryopreserved and banked by freezing the cells and entering the information in the computer to associate the computer entry with the samples.
- the bank system makes it easy to match, for example, desirable biochemical or genetic properties of the banked cells to the therapeutic needs.
- the sample is retrieved and prepared for therapeutic use.
- Cell lysates, ECM or cellular components prepared as described herein may also be cryopreserved or otherwise preserved (e.g., by lyophilization) and banked in accordance with the present invention.
- the term Growth Medium generally refers to a medium sufficient for the culturing of PPDCs.
- one presently preferred medium for the culturing of the cells of the invention in comprises Dulbecco's Modified Essential Media (also abbreviated DMEM herein).
- DMEM-low glucose also DMEM-LG herein
- the DMEM-low glucose is preferably supplemented with 15% (v/v) fetal bovine serum (e.g.
- Growth Medium refers to DMEM-low glucose with 15% fetal bovine serum and antibiotics/antimycotics (when penicillin/streptomycin are included, it is preferably at 50 U/milliliter and 50 microgram/milliliter respectively; when penicillin/streptomycin/amphotericin B are use, it is preferably at 100 U/milliliter, 100 microgram/milliliter and 0.25 microgram/milliliter, respectively). In some cases different growth media are used, or different supplementations are provided, and these are normally indicated in the text as supplementations to Growth Medium.
- standard growth conditions refers to culturing of cells at 37°C, in a standard atmosphere comprising 5% CO 2 . While foregoing the conditions are useful for culturing, it is to be understood that such conditions are capable of being varied by the skilled artisan who will appreciate the options available in the art for culturing cells.
- ANG2 (or Ang2) for angiopoietin 2; APC for antigen-presenting cells; BDNF for brain-derived neurotrophic factor; bFGF for basic fibroblast growth factor; bid (BID) for "bis in die” (twice per day); CK18 for cytokeratin 18; CNS for central nervous system; CXC ligand 3 for chemokine receptor ligand 3; DMEM for Dulbecco's Minimal Essential Medium; DMEM g (or DMEM.Lg, DMEM.LG) for DMEM with low glucose; EDTA for ethylene diamine tetraacetic acid; EGF (or E) for epidermal growth factor; FACS for fluorescent activated cell sorting; ERS for fetal bovine serum; FGF (or F) for fibroblast growth factor; GCP-2 for granulocyte chemotactic protein-2; GFAP for glial fibr
- EXAMPLE 1 Derivation of Cells from Postpartum Tissue This example describes the preparation of postpartum-derived cells from placental and umbilical cord tissues. Postpartum umbilical cords and placentae were obtained upon birth of either a full term or pre-term pregnancy. Cells were harvested from 5 separate donors of umbilicus and placental tissue. Different methods of cell isolation were tested for their ability to yield cells with: 1) the potential to differentiate into cells with different phenotypes, a characteristic common to stem cells, or 2) the potential to provide trophic factors useful for other cells and tissues.
- Umbilical cell isolation Umbilical cords were obtained from National Disease Research Interchange (NDRI , Philadelphia, PA). The tissues were obtained following normal deliveries. The cell isolation protocol was performed aseptically in a laminar flow hood. To remove blood and debris, the cord was washed in phosphate buffered saline (PBS; Invitrogen, Carlsbad, CA) in the presence of antimycotic and antibiotic (100 units/milliliter penicillin, 100 micrograms/milliliter streptomycin, 0.25 micrograms/milliliter amphotericin B).
- PBS phosphate buffered saline
- antibiotic 100 units/milliliter penicillin, 100 micrograms/milliliter streptomycin, 0.25 micrograms/milliliter amphotericin B).
- the tissues were then mechanically dissociated in 150 cm 2 tissue culture plates in the presence of 50 milliliters of medium (DMEM-Low glucose or DMEM- ⁇ igh glucose; Invitrogen), until the tissue was minced into a fine pulp.
- the chopped tissues were transferred to 50 milliliter conical tubes (approximately 5 grams of tissue per tube).
- the tissue was then digested in either DMEM- Low glucose medium or DMEM- ⁇ igh glucose medium, each containing antimycotic and antibiotic as described above.
- C:D collagenase (Sigma, St Louis, MO), 500 Units/milliliter; and dispase (Invitrogen), 50 Units/milliliter in DMEM:-Low glucose medium).
- C:D: ⁇ collagenase, dispase, 50 Units/milliliter; and hyaluronidase (Sigma), 5 Units/milliliter, in DMEM:-Low glucose).
- the conical tubes containing the tissue, medium and digestion enzymes were incubated at 37°C in an orbital shaker (Environ, Brooklyn, NY) at 225 rpm for 2 hrs. After digestion, the tissues were centrifuged at 150 x g for 5 minutes, the supernatant was aspirated. The pellet was resuspended in 20 milliliters of Growth Medium (DMEM:Low glucose (Invitrogen), 15 percent (v/v) fetal bovine serum (FBS; defined bovine serum; Lot#AND18475; Hyclone, Logan, UT), 0.001% (v/v) 2-mercaptoethanol (Sigma), 1 milliliter per 100 milliliters of antibiotic/antimycotic as described above.
- DMEM Growth Medium
- FBS defined bovine serum
- 0.001% (v/v) 2-mercaptoethanol Sigma
- the cell suspension was filtered through a 70- micrometer nylon cell strainer (BD Biosciences). An additional 5 milliliters rinse comprising Growth Medium was passed through the strainer. The cell suspension was then passed through a 40-micrometer nylon cell strainer (BD Biosciences) and chased with a rinse of an additional 5 milliliters of Growth Medium. The filtrate was resuspended in Growth Medium (total volume 50 milliliters) and centrifuged at 150 x g for 5 minutes. The supernatant was aspirated and the cells were resuspended in 50 milliliters of fresh Growth Medium. This process was repeated twice more.
- Cells were then replenished with Growth Medium and allowed to grow to confluence (about 10 days from passage 0) to passage 1. On subsequent passages (from passage 1 to 2 and so on), cells reached sub-confluence (75-85 percent confluence) in 4-5 days. For these subsequent passages, cells were seeded at 5000 cells/cm 2 . Cells were grown in a humidified incubator with 5 percent carbon dioxide and atmospheric oxygen, at 37°C. Placental Cell Isolation. Placental tissue was obtained from NDRI (Philadelphia, PA). The tissues were from a pregnancy and were obtained at the time of a normal surgical delivery. Placental cells were isolated as described for umbilical cell isolation.
- the following example applies to the isolation of separate populations of maternal- derived and neonatal-derived cells from placental tissue.
- the cell isolation protocol was performed aseptically in a laminar flow hood.
- the placental tissue was washed in phosphate buffered saline (PBS; Invitrogen, Carlsbad, CA) in the presence of antimycotic and antibiotic (as described above) to remove blood and debris.
- PBS phosphate buffered saline
- the placental tissue was then dissected into three sections: top-line (neonatal side or aspect), mid-line (mixed cell isolation neonatal and maternal) and bottom line (maternal side or aspect).
- the separated sections were individually washed several times in PBS with antibiotic/antimycotic to further remove blood and debris.
- Each section was then mechanically dissociated in 150 cm 2 tissue culture plates in the presence of 50 milliliters of DMEM/Low glucose, to a fine pulp.
- the pulp was transferred to 50 milliliter conical tubes.
- Each tube contained approximately 5 grams of tissue.
- the tissue was digested in either DMEM-Low glucose or DMEM-High glucose medium containing antimycotic and antibiotic (100 U/milliliter penicillin, 100 micrograms/milliliter streptomycin, 0.25 micrograms/milliliter amphotericin B) and digestion enzymes.
- C:D collagenase and dispase
- collagenase Sigma, St Louis, MO
- dispase Invitrogen
- DMEM-Low glucose medium a mixture of collagenase, dispase and hyaluronidase (C:D:H) was used (collagenase, 500 Units/milliliter; dispase, 50 Units/milliliter; and hyaluronidase (Sigma), 5 Units/milliliter in DMEM-Low glucose).
- the conical tubes containing the tissue, medium, and digestion enzymes were incubated for 2 h at 37°C in an orbital shaker (Environ, Brooklyn, NY) at 225 rpm. After digestion, the tissues were centrifuged at 150 x g for 5 minutes, the resultant supernatant was aspirated off. The pellet was resuspended in 20 milliliters of Growth Medium with penicillin/streptomycin/amphotericin B. The cell suspension was filtered through a 70 micometer nylon cell strainer (BD Biosciences), chased by a rinse with an additional 5 milliliters of Growth Medium.
- the total cell suspension was passed through a 40 micometer nylon cell strainer (BD Biosciences) followed with an additional 5 milliliters of Growth Medium as a rinse.
- the filtrate was resuspended in Growth Medium (total volume 50 milliliters) and centrifuged at 150 x g for 5 minutes.
- the supernatant was aspirated and the cell pellet was resuspended in 50 milliliters of fresh Growth Medium. This process was repeated twice more.
- supernatant was aspirated and the cell pellet was resuspended in 5 milliliters of fresh Growth Medium.
- a cell count was determined using the Trypan Blue Exclusion test. Cells were then cultured at standard conditions. LIBERASE Cell Isolation.
- Enzymes compared for digestion included: i) collagenase; ii) dispase; iii) hyaluronidase; iv) collagenase:dispase mixture (C;D); v) collagenase:hyaluronidase mixture (C:H); vi) dispase:hyaluronidase mixture (D:H); and vii) collagenase:dispase:hyaluronidase mixture (C:D:H). Differences in cell isolation utilizing these different enzyme digestion conditions were observed (Table 1-1).
- Isolation of cells from residual blood in the cords Other attempts were made to isolate pools of cells from umbilical cord by different approaches. In one instance umbilical cord was sliced and washed with Growth Medium to dislodge the blood clots and gelatinous material. The mixture of blood, gelatinous material and Growth Medium was collected and centrifuged at 150 x g. The pellet was resuspended and seeded onto gelatin-coated flasks in Growth Medium. From these experiments a cell population was isolated that readily expanded. Isolation of cells from cord blood. Cells have also been isolated from cord blood samples attained from NDRI. The isolation protocol used here was that of International Patent Application US0229971 by Ho et al (Ho, T. W.
- WO2003025149 A2 Samples (50 milliliter and 10.5 milliliters, respectively) of umbilical cord blood (NDRI, Philadelphia PA) were mixed with lysis buffer (filter-sterilized 155 mM ammonium chloride, 10 millimolar potassium bicarbonate, 0.1 millimolar EDTA buffered to pH 7.2 (all components from Sigma, St. Louis, MO)). Cells were lysed at a ratio of 1:20 cord blood to lysis buffer. The resulting cell suspension was vortexed for 5 seconds, and incubated for 2 minutes at ambient temperature. The lysate was centrifuged (10 minutes at 200 x g).
- the cell pellet was resuspended in complete minimal essential medium (Gibco, Carlsbad CA) containing 10 percent fetal bovine serum (Hyclone, Logan UT), 4 millimolar glutamine (Mediatech Hemdon, VA ), 100 Units penicillin per 100 milliliters and 100 micrograms streptomycin per 100 milliliters (Gibco, Carlsbad, CA).
- the resuspended cells were centrifuged (10 minutes at 200 x g), the supernatant was aspirated, and the cell pellet was washed in complete medium.
- T75 flasks Coming, NY
- T75 laminin-coated flasks T175 fibronectin-coated flasks
- T175 fibronectin-coated flasks both Becton Dickinson, Bedford, MA. Isolation of cells using different enzyme combinations and growth conditions. To determine whether cell populations could be isolated under different conditions and expanded under a variety of conditions immediately after isolation, cells were digested in Growth Medium with or without 0.001 percent (v/v) 2-mercaptoethanol (Sigma, St. Louis, MO), using the enzyme combination of C:D:H, according to the procedures provided above. Placental-derived cells so isolated were seeded under a variety of conditions. All cells were grown in the presence of penicillin/streptomycin. (Table 1-2).
- Table 1-2 Isolation and culture expansion of postpartum cells under varying conditions:
- collagenase a matrix metal loprotease
- dispase a neutral protease
- hyaluronidase a mucolytic enzyme that breaks down hyaluronic acid
- Blendzyme 3 which is collagenase (4 Wunsch units/g) and thermolysin (1714 casein Units/g) was also used together with hyaluronidase to isolate cells. These cells expanded readily over many passages when cultured in Growth Medium on gelatin coated plastic. Cells were also isolated from residual blood in the cords, but not cord blood. The presence of cells in blood clots washed from the tissue, that adhere and grow under the conditions used, may be due to cells being released during the dissection process.
- PPDCs postpartum-derived cells
- the process of cell expansion to senescence is referred to as Hayflick's limit (Hayflick L. 1974a, 1974b).
- Postpartum-derived cells are highly suited for therapeutic use because they can be readily expanded to sufficient cell numbers.
- Tissue culture plastic flasks were coated by adding 20 milliliters 2% (w/v) porcine gelatin (Type B: 225 Bloom; Sigma, St Louis, MO) to a T75 flask (Coming, Coming, NY) for 20 minutes at room temperature. After removing the gelatin solution, 10 milliliters phosphate-buffered saline (PBS) (Invitrogen, Carlsbad, CA) was added and then aspirated. Comparison of expansion potential of PPDCs with other cell populations.
- PBS phosphate-buffered saline
- Cloning was used in order to expand a population of neonatal cells from placental tissue. Following isolation of three ditterential cell populations from the placenta (as described herein), these cell populations were expanded under standard growth conditions and then karyotyped to reveal the identity of the isolated cell populations. Because the cells were isolated from a mother who delivered a boy, it was straightforward to distinguish between the male and female chromosomes by performing metaphase spreads.
- fetal-aspect cells were karyotype positive for neonatal phenotpye
- mid-layer cells were karyotype positive for both neonatal and maternal phenotypes
- matemal-aspect cells were karyotype positive for maternal cells.
- Expansion of cells in low oxygen culture conditions It has been demonstrated that low oxygen cell culture conditions can improve cell expansion in certain circumstances (US 20040005704).
- cultures of umbilical-derived cells were grown in low oxygen conditions. Cells were seeded at 5000 cells/cm 2 in Growth Medium on gelatin coated flasks.
- Cells were initially cultured under standard atmospheric conditions through passage 5, at which point they were transferred to low oxygen (5% O 2 ) culture conditions. Other growth conditions. In other protocols, cells were expanded on non-coated, collagen-coated, fibronectin-coated, laminin-coated and extracellular matrix protein-coated plates. Cultures have been demonstrated to expand well on these different matrices.
- Table 2-1 Growth characteristics for different cell populations grown to senescence
- Umbilicus-derived, placenta-derived and fibroblast cells expanded for greater than 10 passages generating cell yields of > 1E11 cells in 60 days (Table 2-2). After 60 days under these conditions the fibroblasts became senescent whereas the umbilicus-derived and placenta-derived cell populations senesced after 80 days, completing >50 and > 40 population doublings respectively.
- Table2- 2 Growth characteristics for different cell populations using low density growth expansion from passage 10 till senescence
- PPDCs Expansion of PPDCs at low density from initial cell seeding.
- PPDCs were expanded at low density (1,000 cells/cm 2 ) on gelatin-coated and uncoated plates or flasks. Growth potential of these cells under these conditions was good. The cells expanded readily in a log phase growth. The rate of cell expansion was similar to that observed when placenta-derived cells were seeded at 5000 cells/cm 2 on gelatin-coated flasks in Growth Medium. No differences were observed in cell expansion potential between culturing on either uncoated flasks or gelatin- coated flasks. However, cells appeared phenotypically much smaller on gelatin-coated flasks and more larger cell phenotypes were observed on uncoated flasks.
- a clonal neonatal or maternal cell population can be expanded from placenta-derived cells isolated from the neonatal aspect or the maternal aspect, respectively, of the placenta.
- Cells are serially diluted and then seeded onto gelatin-coated plates in Growth medium for expansion at 1 cell/well in 96- well gelatin coated plates. From this initial cloning, expansive clones are identified, trypsinized, and reseeded in 12-well gelatin-coated plates in Growth medium and then subsequently passaged into T25 gelatin-coated flasks at 5,000 cells/cm 2 in Growth medium.
- Subcloning is performed to ensure that a clonal population of cells has been identified.
- cells are trypsinized and reseeded at 0.5 cells/well.
- the subclones that grow well are expanded in gelatin- coated T25 flasks at 5,000 cells cm 2 /flask .
- Cells are passaged at 5,000 cells cm 2 /T75 flask.
- the growth characteristics of a clone may be plotted to demonstrate cell expansion.
- Karyotyping analysis can confirm that the clone is either neonatal or maternal. Expansion of cells in low oxygen culture conditions.
- lower density culture conditions e.g. 1000 cells/cm 2
- postpartum-derived cells are preferred for generating large pools of cells.
- postpartum-derived cell expansion can likewise be altered. This strategy may be used to enhance the proliferative and differentiative capacity of these cell populations.
- postpartum-derived cells expand readily to large numbers.
- placenta-derived cells were evaluated for their ability to support the growth of placenta-derived cells.
- the growth of placenta-derived cells in normal (20%) and low (5%) oxygen was assessed after 3 days using the MTS colorimetric assay.
- Methods & Materials Placenta-derived cells at passage 8 (P8) were seeded at 1 x 10 cells/well in 96 well plates in Growth Medium with penicillin/streptomycin. After 8 hours the medium was changed as described below and cells were incubated in normal (atmospheric) or low (5%, v/v) oxygen at 37°C, 5% CO 2 for 48 hours.
- MTS was added to the culture medium (CELLTITER 96 AQueous One Solution Cell Proliferation Assay, Promega, Madison, WI) for 3 hours and the absorbance measured at 490 nanometers (Molecular Devices, Sunnyvale CA).
- Results Standard curves for the MTS assay established a linear correlation between an increase in absorbance and an increase in cell number.
- the absorbance values obtained were converted into estimated cell numbers and the change (%) relative to the initial seeding was calculated.
- the Effect of Serum The addition of serum to media at normal oxygen conditions resulted in a reproducible dose-dependent increase in absorbance and thus the viable cell number.
- the addition of serum to complete MSCGM resulted in a dose-dependent decrease in absorbance. In the media without added serum, cells only grew appreciably in CELLGRO- FREE, Ham's F10 and DMEM.
- the Effect of Oxygen Reduced oxygen appeared to increase the growth rate of cells in Growth Medium, Ham's F10, and MSCGM.
- Placenta-derived cells may be grown in a variety of culture media in normal or low oxygen. Short term growth of placenta-derived cells was determined in twelve basal media with 0, 2 and 10% (v/v) serum in 5% or atmospheric oxygen. In general, placenta-derived cells did not grow as well in serum-free conditions with the exception of Ham's F10 and CELLGRO-Free, which are also protein-free. Growth in these serum-free media was about 25- 33% of the maximal growth observed with media containing 15% serum.
- P3 Methods & Materials k Placenta-derived cells (P3), fibroblasts (P9) and umbilical-derived cells (P5) were seeded at 5 x 10 3 cells/cm 2 in gelatin-coated T75 flasks (Coming, Co ing, NY). After 24 hours the medium was removed and the cells were washed with phosphate buffered saline (PBS) (Gibco, Carlsbad, CA) to remove residual medium.
- PBS phosphate buffered saline
- the medium was replaced with a Modified Growth Medium (DMEM with D-valine (special order Gibco), 15% (v/v) dialyzed fetal bovine serum (Hyclone, Logan, UT), 0.001% (v/v) betamercaptoethanol (Sigma), penicillin/streptomycin (Gibco)).
- DMEM Modified Growth Medium
- D-valine special order Gibco
- 15% (v/v) dialyzed fetal bovine serum Hyclone, Logan, UT
- betamercaptoethanol Sigma
- penicillin/streptomycin Gabco
- the cell suspension was centrifuged and resuspended in 1 milliliter of each media below and transferred into Cryovials (Nalgene).
- Growth Medium +10% (v/v) DMSO (Hybrimax, Sigma, St. Louis, MO) 2.
- Cell Freezing medium serum-free C2639, Sigma, St. Louis, MO
- Cell Freezing Medium w/glycerol C6039, Sigma, St.
- the cells were cooled at approximately -l°C/min overnight in a -80°C freezer using a "Mr Frosty" freezing container according to the manufacturer's instructions (Nalgene, Rochester, NY). Vials of cells were transferred into liquid nitrogen for 2 days before thawing rapidly in a 37°C water bath. The cells were added to 10 milliliters Growth Medium and centrifuged before the cell number and viability was estimated. Cells were seeded onto gelatin-coated flasks at 5,000 cells/cm 2 to determine whether the cells would attach and proliferate.
- the initial viability of the cells to be cryopreserved was assessed by trypan blue staining to be 100%.
- the initial viability of the cells to be cryopreserved was assessed by trypan blue staining to be 100%.
- the viable cells cryopreserved in all four solutions attached, divided, and produced a confluent monolayer within 3 days. There was no discemable difference in estimated growth rate.
- Summary The cryopreservation of cells is one procedure available for preparation of a cell bank or a cell product. Four cryopreservation mixtures were compared for their ability to protect human placenta-derived cells from freezing damage. Dulbecco's modified Eagle's medium (DMEM) and 10% (v/v) dimethylsulfoxide (DMSO) is the preferred medium of those compared for cryopreservation of placenta-derived cells.
- DMEM Dulbecco's modified
- Cell lines used in cell therapy are preferably homogeneous and free from any contaminating cell type.
- Cells used in cell therapy should have a normal chromosome number (46) and structure.
- placenta- and umbilicus-derived cell lines that are homogeneous and free from cells of non-postpartum tissue origin karyotypes of cell samples were analyzed.
- PPDCs from postpartum tissue of a male neonate were cultured in Growth Medium containing penicillin/streptomycin.
- Postpartum tissue from a male neonate (X,Y) was selected to allow distinction between neonatal-derived cells and maternal derived cells (X,X).
- Cells were seeded at 5,000 cells per square centimeter in Growth Medium in a T25 flask (Coming, Coming,
- N- Neonatal aspect V- villous region
- M- maternal aspect M- maternal aspect
- Chromosome analysis identified placenta- and umbilicus-derived cellswhose karyotypes appeared normal as interpreted by a clinical cytogenetic laboratory.
- Karyotype analysis also identified cell lines free from maternal cells, as determined by homogeneous karyotype.
- Characterization of cell surface proteins or "markers" by flow cytometry can be used to determine a cell line's identity. The consistency of expression can be determined from multiple donors, and in cells exposed to different processing and culturing conditions. Postpartum- derived cell (PPDC) lines isolated from the placenta and umbilicus were characterized (by flow cytometry), providing a profile for the identification of these cell lines.
- PPDC Postpartum- derived cell
- Cells were harvested, centrifuged, and resuspended in 3% (v/v) FBS in PBS at a cell concentration of lxlO 7 per milliliter.
- antibody to the cell surface marker of interest (see below) was added to one hundred microliters of cell suspension and the mixture was incubated in the dark for 30 minutes at 4°C. After incubation, cells were washed with PBS and centrifuged to remove unbound antibody. Cells were resuspended in 500 microliter PBS and analyzed by flow cytometry. Flow cytometry analysis was performed with a FACScalibur instrument (Becton Dickinson, San Jose, CA). The following antibodies to cell surface markers were used.
- Placenta and umbilicus comparison Placenta-derived cells were compared to umbilicus-derive cells at passage 8. Passage to passage comparison. Placenta- and umbilicus-derived cells were analyzed at passages 8, 15, and 20. Donor to donor comparison. To compare differences among donors, placenta-derived cells from different donors were compared to each other, and umbilicus-derived cells from different donors were compared to each other. Surface coating comparison. Placenta-derived cells cultured on gelatin-coated flasks was compared to placenta-derived cells cultured on uncoated flasks.
- Umbilicus-derived cells cultured on gelatin-coated flasks was compared to umbilicus-derived cells cultured on uncoated flasks. Digestion enzyme comparison. Four treatments used for isolation and preparation of cells were compared. Cells isolated from placenta by treatment with 1) collagenase; 2) collagenase/dispase; 3) collagenase/hyaluronidase; and 4) collagenase/hyaluronidase/dispase were compared. Placental layer comparison. Cells derived from the matemal aspect of placental tissue were compared to cells derived from the villous region of placental tissue and cells derived from the neonatal fetal aspect of placenta.
- Placenta vs. umbilicus comparison results placenta vs. umbilicus comparison.
- Placenta- and umbilicus-derived cells analyzed by flow cytometry showed positive expression of CD10, CD13, CD44, CD73, CD 90, PDGFr-alpha and HLA-A, B, C, indicated by the increased values of fluorescence relative to the IgG control.
- These cells were negative for detectable expression of CD31, CD34, CD45, CD117, CD141, and HLA-DR, DP, DQ, indicated by fluorescence values comparable to the IgG control. Variations in fluorescence values of positive curves were accounted for.
- CD90 of the positive curves showed some variation, but the curves appeared normal, confirming a homogenous population. Both curves individually exhibited values greater than the IgG control.
- the cells were negative for expression of CD31, CD34, CD45, CD117, CD141, and HLA-DR, DP, DQ having fluorescence values consistent with the IgG control.
- Umbilicus-derived cells at passage 8, 15, and 20 analyzed by flow cytometry all expressed CD10, CD13, CD44, CD73, CD 90, PDGFr-alpha and HLA-A, B, C, indicated by increased fluorescence relative to the IgG control. These cells were negative for CD31, CD34, CD45, CD117, CD141, and HLA-DR, DP, DQ, indicated by fluorescence values consistent with the IgG control.
- Placenta-derived cells isolated from separate donors analyzed by flow cytometry each expressed CD10, CD 13, CD44, CD73, CD 90, PDGFr-alpha and HLA-A, B, C, with increased values of fluorescence relative to the IgG control.
- the cells were negative for expression of CD31, CD34, CD45, CD117, CD141, and HLA-DR, DP, DQ as indicated by fluorescence value consistent with the IgG control.
- Umbilicus-derived cells isolated from separate donors analyzed by flow cytometry each showed positive expression of CD10, CD13, CD44, CD73, CD 90, PDGFr-alpha and HLA-A, B, C, reflected in the increased values of fluorescence relative to the IgG control. These cells were negative for expression of CD31, CD34, CD45, CD117, CD141, and HLA-DR, DP, DQ with fluorescence values consistent with the IgG control. The effect of surface coating with gelatin on placenta-derived cells.
- Placenta-derived cells expanded on either gelatin-coated or uncoated flasks analyzed by flow cytometry all expressed of CD10, CD13, CD44, CD73, CD 90, PDGFr-alpha and HLA-A, B, C, reflected in the increased values of fluorescence relative to the IgG control. These cells were negative for expression of CD31, CD34, CD45, CD117, CD141, and HLA-DR, DP, DQ indicated by fluorescence values consistent with the IgG control. The effect of surface coating with gelatin on umbilicus-derived cells.
- Placenta-derived cells isolated using various digestion enzymes analyzed by flow cytometry all expressed CD10, CD 13, CD44, CD73, CD 90, PDGFr-alpha and HLA-A, B, C, as indicated by the increased values of fluorescence relative to the IgG control. These cells were negative for expression of CD31, CD34, CD45, CDl 17, CD141, and HLA-DR, DP, DQ as indicated by fluorescence values consistent with the IgG control ⁇ Placental layer comparison.
- Cells isolated from the maternal, villous, and neonatal layers of the placenta, respectively, analyzed by flow cytometry showed positive expression of CD10, CD13, CD44, CD73, CD 90, PDGFr-alpha and HLA-A, B, C, as indicated by the increased value of fluorescence relative to the IgG control. These cells were negative for expression of CD31, CD34, CD45, CDl 17, CD141, and HLA-DR, DP, DQ as indicated by fluorescence values consistent with the IgG control. Summary. Analysis of placenta- and umbilicus-derived cells by flow cytometry has established of an identity of these cell lines.
- Placenta- and umbilicus-derived cells are positive for CD10, CD13, CD44, CD73, CD90, PDGFr-alpha, HLA-A,B,C and negative for CD31, CD34, CD45, CDl 17, CD141and HLA-DR, DP, DQ.
- This identity was consistent between variations in variables including the donor, passage, culture vessel surface coating, digestion enzymes, and placental layer. Some variation in individual fluorescence value histogram curve means and ranges was observed, but all positive curves under all conditions tested were normal and expressed fluorescence values greater than the IgG control, thus confirming that the cells comprise a homogenous population that has positive expression,of the markers.
- anti-human GROalpha - PE (1:100; Becton Dickinson, Franklin Lakes, NJ)
- anti-human GCP-2 (1:100; Santa Cruz Biotech, Santa Cruz, CA)
- anti-human oxidized LDL receptor 1 ox- LDL Rl; 1:100; Santa Cruz Biotech
- anti-human NOGO-A (1:100; Santa Cruz Biotech).
- Fixed specimens were trimmed with a scalpel and placed within OCT embedding compound (Tissue-Tek OCT; Sakura, Torrance, CA) on a dry ice bath containing ethanol. Frozen blocks were then sectioned (10 ⁇ m thick) using a standard cryostat (Leica Microsystems) and mounted onto glass slides for staining.
- Immunohistochemistry was performed similar to previous studies (e.g., Messina, et al., 2003, Exper. Neurol. 184: 816-829). Tissue sections were washed with phosphate-buffered saline (PBS) and exposed to a protein blocking solution containing PBS, 4% (v/v) goat serum (Chemicon, Temecula, CA), and 0.3% (v/v) Triton (Triton X-100; Sigma) for 1 hour to access intracellular antigens. In instances where the epitope of interest would be located on the cell surface (CD34, ox-LDL Rl), Triton was omitted in all steps of the procedure in order to prevent epitope loss.
- PBS phosphate-buffered saline
- Triton Triton X-100
- Vimentin, desmin, SMA, CK18, vWF, and CD34 markers were expressed in a subset of the cells found within umbilical cord.
- vWF and CD34 expression were restricted to blood vessels contained within the cord.
- CD34+ cells were on the innermost layer (lumen side).
- Vimentin expression was found throughout the matrix and blood vessels of the cord.
- SMA was limited to the matrix and outer walls of the artery & vein, but not contained with the vessels themselves.
- CK18 and desmin were observed within the vessels only, desmin being restricted to the middle and outer layers. Placenta characterization.
- Vimentin, desmin, SMA, CK18, vWF, and CD34 were all observed within the placenta and regionally specific.
- GROalpha, GCP-2, ox-LDL Rl, and NOGO-A Tissue Expression None of these markers were observed within umbilical cord or placental tissue. Summary. Vimentin, desmin, alpha-smooth muscle actin, cytokeratin 18, von Willebrand Factor, and CD 34 are expressed in cells within human umbilical cord and placenta.
- Affymetrix GENECHJP arrays were used to compare gene expression profiles of umbilicus- and placenta-derived cells with fibroblasts, human mesenchymal stem cells, and another cell line derived from human bone marrow. This analysis provided a characterization of the postpartum-derived cells and identified unique molecular markers for these cells.
- Human umbilical cords and placenta were obtained from National Disease Research Interchange (NDRI, Philadelphia, PA) from normal full term deliveries with patient consent. The tissues were received and cells were isolated as described in Example 1. Cells were cultured in Growth Medium (using DMEM-LG) on gelatin-coated tissue culture plastic flasks. The cultures were incubated at 37° C with 5 % CO 2 . Human dermal fibroblasts were purchased from Cambrex Incorporated (Walkersville, MD; Lot number 9F0844) and ATCC CRL-1501 (CCD39SK).
- hMSC Human mesenchymal stem cells
- Cambrex Incorporated Walkersville, MD; Lot numbers 2F1655, 2F1656 and 2F1657 and cultured according to the manufacturer's specifications in MSCGM Media (Cambrex).
- the cells were grown on standard tissue cultured plastic at 37 °C with 5 % CO 2 .
- Human ileac crest bone marrow was received from NDRI with patient consent.
- the marrow was processed according to the method outlined by Ho, et al. (WO03/025149).
- the marrow was mixed with lysis buffer (155 mM NH4CI, 10 mM KHCO 3 , and 0.1 mM EDTA, pH 7.2) at a ratio of 1 part bone marrow to 20 parts lysis buffer.
- the cell suspension was vortexed, incubated for 2 minutes at ambient temperature, and centrifuged for 10 minutes at 500 x g. The supernatant was discarded and the cell pellet was resuspended in Minimal Essential Medium- alpha (Invitrogen) supplemented with 10 % (v/v) fetal bovine serum and 4 mM glutamine.
- the cells were centrifuged again and the cell pellet was resuspended in fresh medium.
- the viable mononuclear cells were counted using trypan-blue exclusion (Sigma, St. Louis, MO).
- the mononuclear cells were seeded in tissue-cultured plastic flasks at 5 x 104 cells/cm 2 .
- the cells were incubated at 37 °C with 5% CO 2 at either standard atmospheric O or at 5% O 2 .
- Cells were cultured for 5 days without a media change. Media and non-adherent cells were removed after 5 days of culture. The adherent cells were maintained in culture. Isolation of mRNA and GENECHIP Analysis.
- Table 9-2 shows the Euclidean distances that were calculated for the comparison of the cell pairs.
- the Euclidean distances were based on the comparison of the cells based on the 290 genes that were differentially expressed among the cell types.
- the Euclidean distance is inversely proportional to similarity between the expression of the 290 genes (i.e., the greater the distance, the less similarity exists).
- Tables 9-3, 9-4, and 9-5 show the expression of genes increased in placenta-derived cells (Table 9-3), increased in umbilicus-derived cells (Table 9-4), and reduced in umbilicus- and placenta- derived cells (Table 9-5).
- the column entitled “Probe Set ED” refers to the manufacturer's identification code for the sets of several oligonucleotide probes located on a particular site on the chip, which hybridize to the named gene (column "Gene Name”), comprising a sequence that can be found within the NCBI (GenBank) database at the specified accession number (column "NCBI Accession Number”).
- Tables 9-6, 9-7, and 9-8 show the expression of genes increased in human fibroblasts (Table 9-6), ICBM cells (Table 9-7), and MSCs (Table 9-8).
- ICBM Cells cardiac ankyrin repeat protein •MHC class I region ORF •integrin, alpha 10 •hypothetical protein FLJ22362 •UDP-N-acetyl-alpha-D-galactosamine:polypeptide N-acetylgalactosaminyltransferase 3 (GalNAc-T3) •interferon-induced protein 44 •SRY (sex determining region Y)-box 9 (campomelic dysplasia, autosomal sex-reversal) •keratin associated protein 1-1 •hippocalcin-like 1 •jagged 1 (Alagille syndrome) •proteoglycan 1, secretory granule
- the present examination was performed to provide a molecular characterization of the postpartum cells derived from umbilical cord and placenta. This analysis included cells derived from three different umbilical cords and three different placentas. The examination also included two different lines of dermal fibroblasts, three lines of mesenchymal stem cells, and three lines of ileac crest bone marrow cells. The mRNA that was expressed by these cells was analyzed using an oligonucleotide array that contained probes for 22,000 genes. Results showed that 290 genes are differentially expressed in these five different cell types. These genes include ten genes that are specifically increased in the placenta-derived cells and seven genes specifically increased in the umbilical cord-derived cells.
- Fifty-four genes were found to have specifically lower expression levels in placenta and umbilical cord, as compared with the other cell types. The expression of selected genes has been confirmed by PCR (see the example that follows). These results demonstrate that the postpartum-derived cells have a distinct gene expression profile, for example, as compared to bone marrow-derived cells and fibroblasts.
- similarities and differences in cells derived from the human placenta and the human umbilical cord were assessed by comparing their gene expression profiles with those of cells derived from other sources (using an oligonucleotide array).
- Six "signature” genes were identified: oxidized LDL receptor 1, interleukin-8, rennin, reticulon, chemokine receptor ligand 3 (CXC ligand 3), and granulocyte chemotactic protein 2 (GCP-2). These "signature” genes were expressed at relatively high levels in postpartum-derived cells.
- Placenta-derived cells three isolates, including one isolate predominately neonatal as identified by karyotyping analysis), umbilicus-derived cells (four isolates), and Normal Human Dermal Fibroblasts (NHDF; neonatal and adult) grown in Growth Medium with penicillin/streptomycin in a gelatin-coated T75 flask.
- Mesechymal Stem Cells were grown in Mesenchymal Stem Cell Growth Medium Bullet kit (MSCGM; Cambrex, Walkerville, MD).
- IL-8 protocol cells were thawed from liquid nitrogen and plated in gelatin-coated flasks at 5,000 cells/cm 2 , grown for 48 hours in Growth Medium and then grown for further 8 hours in 10 milliliters of serum starvation medium [DMEM -low glucose (Gibco, Carlsbad, CA), penicillin/streptomycin (Gibco, Carlsbad, CA) and 0.1% (w/v) Bovine Serum Albumin (BSA;
- serum starvation medium [DMEM -low glucose (Gibco, Carlsbad, CA), penicillin/streptomycin (Gibco, Carlsbad, CA) and 0.1% (w/v) Bovine Serum Albumin (BSA;
- Cells were resuspended in 4 milliliters culture medium and counted. Cells were grown in a 75 cm 2 flask containing 15 milliliters of Growth Medium at 375,000 cell/flask for 24 hours. The medium was changed to a serum starvation medium for 8 hours. Serum starvation medium was collected at the end of incubation, centrifuged at 14,000 x g for 5 minutes (and stored at -20 °C). To estimate the number of cells in each flask, 2 milliliters of tyrpsin EDTA (Gibco, Carlsbad, CA) was added each flask. After cells detached from the flask, trypsin activity was neutralized with 8 milliliters of Growth Medium.
- tyrpsin EDTA Gibco, Carlsbad, CA
- RNA isolation RNA was extracted from confluent postpartum-derived cells and fibroblasts or for EL-8 expression from cells treated as described above.
- PCR was performed on cDNA samples using Assays-on-DemandTM gene expression products: oxidized LDL receptor (Hs00234028); rennin (Hs00166915); reticulon (Hs00382515); CXC ligand 3 (Hs00171061); GCP-2 (Hs00605742); IL-8 (Hs00174103); and GAPDH (Applied Biosystems, Foster City, CA) were mixed with cDNA and TaqMan Universal PCR master mix according to the manufacturer's instructions (Applied Biosystems, Foster City, CA) using a 7000 sequence detection system with ABI Prism 7000 SDS software (Applied Biosystems, Foster City, CA).
- Thermal cycle conditions were initially 50°C for 2 min and 95 °C for 10 min, followed by 40 cycles of 95 °C for 15 sec and 60°C for 1 min.
- PCR data was analyzed according to manufacturer's specifications (User Bulletin #2 from Applied Biosystems for ABI Prism 7700 Sequence Detection System).
- Conventional PCR was performed using an ABI PRISM 7700 (Perkin Elmer Applied Biosystems, Boston, Massachusetts, USA) to confirm the results from real-time PCR. PCR was performed using 2 microliters of cDNA solution, lx AmpliTaq Gold universal mix PCR reaction buffer (Applied Biosystems, Foster City, CA) and initial denaturation at 94°C for 5 minutes. Amplification was optimized for each primer set.
- EL-8 For EL-8, CXC ligand 3, and reticulon (94°C for 15 seconds, 55°C for 15 seconds and 72°C for 30 seconds for 30 cycles); for rennin (94°C for 15 seconds, 53°C for 15 seconds and 72°C for 30 seconds for 38 cycles); for oxidized LDL receptor and GAPDH (94°C for 15 seconds, 55°C for 15 seconds and 72°C for 30 seconds for 33 cycles).
- Primers used for amplification are listed in Table 1. Primer concentration in the final PCR reaction was 1 micromolar except for GAPDH, which was 0.5 micromolar. GAPDH primers were the same as real-time PCR, except that the manufacturer's TaqMan probe was not added to the final PCR reaction.
- Interleukin-8 5'- TCTGCAGCTCTGTGTGAAGG-3 ' (SEQ ID NO: 7) 5 ' -CTTCAAAAACTTCTCCACAACC- 3' (SEQ ID NO: 8)
- Chemokine (CXC) ligand 3 5'- CCCACGCCACGCTCTCC-3' (SEQ ID NO: 9) 5 ' -TCCTGTCAGTTGGTGCTCC -3' (SEQ ID NO: 10)
- PPDCs were fixed with cold 4% (w/v) paraformaldehyde (Sigma-Aldrich, St. Louis, MO) for 10 minutes at room temperature.
- One isolate each of umbilicus- and placenta-derived cells at passage 0 (P0) (directly after isolation) and passage 11 (PI 1) (two isolates of placenta-derived, two isolates of umbilicus-derived cells) and fibroblasts (Pll) were used.
- Immunocytochemistry was performed using antibodies directed against the following epitopes: vimentin (1:500, Sigma, St.
- Triton X-100 was omitted in all steps of the procedure in order to prevent epitope loss.
- the primary antibody was raised against goat (GCP-2, ox-LDL Rl, NOGO-A)
- 3% (v/v) donkey serum was used in place of goat serum throughout.
- the primary antibody solutions were removed and the cultures were washed with PBS prior to application of secondary antibody solutions (1 hour at room temperature) containing block along with goat anti-mouse IgG - Texas Red (1:250; Molecular Probes, Eugene, OR) and/or goat anti-rabbit IgG - Alexa 488 (1:250; Molecular Probes) or donkey anti- goat IgG - FITC (1:150, Santa Cruz Biotech). Cultures were then washed and 10 micromolar DAPI (Molecular Probes) applied for 10 minutes to visualize cell nuclei. Following immunostaining, fluorescence was visualized using an appropriate fluorescence filter on an Olympus inverted epi-fluorescent microscope (Olympus, Melville, NY).
- results of real-time PCR for selected "signature" genes performed on cDNA from cells derived from human placentae, adult and neonatal fibroblasts and Mesenchymal Stem Cells (MSCs) indicate that both oxidized LDL receptor and rennin were expressed at higher level in the placenta-derived cells as compared to other cells.
- the data obtained from real-time PCR were analyzed by the ⁇ CT method and expressed on a logarithmic scale. Levels of reticulon and oxidized LDL receptor expression were higher in umbilicus-derived cells as compared to other cells. No significant difference in the expression levels of CXC ligand 3 and GCP-2 were found between postpartum-derived cells and controls.
- Table 10-1 EL-8 protein amount measured by ELISA
- Placenta-derived cells were also examined for the production of oxidized LDL receptor, GCP-2 and GROalpha by FACS analysis. Cells tested positive for GCP-2. Oxidized LDL receptor and GRO were not detected by this method. Placenta-derived cells were also tested for the production of selected proteins by immunocytochemical analysis. Immediately after isolation (passage 0), cells derived from the human placenta were fixed with 4% paraformaldehyde and exposed to antibodies for six proteins: von Willebrand Factor, CD34, cytokeratin 18, desmin, alpha-smooth muscle actin, and vimentin. Cells stained positive for both alpha-smooth muscle actin and vimentin. This pattern was preserved through passage 11.
- PPDCs Postpartum-derived cells
- APC antigen-presenting cells
- the cell lines were also analyzed by flow cytometry for the expression of HLA-G (Abbas & Lichtman, 2003, supra), CD 178 (Coumans, et al., (1999) Journal of Immunological Methods 224, 185-196), and PD-L2 (Abbas & Lichtman, 2003, supra; Brown, et. al. (2003) 77 ⁇ e Journal of Immunology 170, 1257-1266).
- HLA-G Abbas & Lichtman, 2003, supra
- CD 178 Cells, et al., (1999) Journal of Immunological Methods 224, 185-196
- PD-L2 Abbas & Lichtman, 2003, supra; Brown, et. al. (2003) 77 ⁇ e Journal of Immunology 170, 1257-1266.
- the expression of these proteins by cells residing in placental tissues is thought to mediate the immuno-privileged status of placental tissues in utero.
- MLR mixed lymphocyte reaction
- Cell culture Cells were cultured to confluence in Growth Medium containing penicillin/streptomycin in T75 flasks (Coming, Co ing, NY) coated with 2% gelatin (Sigma, St. Louis, MO). Antibody Staining. Cells were washed in phosphate buffered saline (PBS) (Gibco, Carlsbad, CA) and detached with Trypsin/EDTA (Gibco, Carlsbad, MO). Cells were harvested, centrifuged, and re-suspended in 3% (v/v) FBS in PBS at a cell concentration of lxlO 7 per milliliter.
- PBS phosphate buffered saline
- Antibody (Table 11-1) was added to one hundred microliters of cell suspension as per manufacturer's specifications and incubated in the dark for 30 minutes at 4°C. After incubation, cells were washed with PBS and centrifuged to remove unbound antibody. Cells were resuspended in five hundred microliters of PBS and analyzed by flow cytometry using a FACSCalibur instrument (Becton Dickinson, San Jose, CA).
- PBMCs Peripheral blood mononuclear cells
- Stimulator (donor) allogeneic PBMC, autologous PBMC, and postpartum cell lines were treated with mitomycin C.
- Autologous and mitomycin C-treated stimulator cells were added to responder (recipient) PBMCs and cultured for 4 days.
- the stimulation index for the allogeneic donor was calculated as the mean proliferation of the receiver plus mitomycin C-treated allogeneic donor divided by the baseline proliferation of the receiver.
- the stimulation index of the PPDCs was calculated as the mean proliferation of the receiver plus mitomycin C-treated postpartum cell line divided by the baseline proliferation of the receiver.
- Table 11-3 Average stimulation index of placenta cells and an allogeneic donor in a mixed lymphocyte reaction with six individual allogeneic receivers
- Table 11-5 Average stimulation index of umbilicus-derived cells and an allogeneic donor in a mixed lymphocyte reaction with five individual allogeneic receivers.
- Antigen presenting cell markers - placenta-derived cells Histograms of placenta- derived cells analyzed by flow cytometry show negative expression of HLA-DR, DP, DQ, CD80, CD86, and B7-H2, as noted by fluorescence value consistent with the IgG control, indicating that placental cell lines lack the cell surface molecules required to directly stimulate CD4 + T cells. Immunomodulating markers - placenta-derived cells. Histograms of placenta- derived cells analyzed by flow cytometry show positive expression of PD-L2, as noted by the increased value of fluorescence relative to the IgG control, and negative expression of CD178 and HLA-G, as noted by fluorescence value consistent with the IgG control.
- Antigen presenting cell markers - umbilicus-derived cells Histograms of umbilicus- derived cells analyzed by flow cytometry show negative expression of HLA-DR, DP, DQ, CD80, CD86, and B7-H2, as noted by fluorescence value consistent with the IgG control, indicating that umbilical cell lines lack the cell surface molecules required to directly stimulate CD4 + T cells.
- Immunomodulating cell markers - umbilicus-derived cells Histograms of umbilicus- derived cells analyzed by flow cytometry show positive expression of PD-L2, as noted by the increased value of fluorescence relative to the IgG control, and negative expression of CD178 and HLA-G, as noted by fluorescence value consistent with the IgG control.
- the average stimulation index ranged from 1.3 to 3, and that of the allogeneic positive controls ranged from 46.25 to 279.
- the average stimulation index ranged from 6.5 to 9, and that of the allogeneic positive controls ranged from 42.75 to 70.
- Placenta- and umbilicus-derived cell lines were negative for the expression of the stimulating proteins HLA-DR, HLA-DP, HLA-DQ, CD80, CD86, and B7-H2, as measured by flow cytometry.
- Placenta- and umbilicus-derived cell lines were negative for the expression of immuno-modulating proteins HLA-G and CD178 and positive for the expression of PD-L2, as measured by flow cytometry.
- Allogeneic donor PBMCs contain antigen-presenting cells expressing HLA-DR, DQ, CD8, CD86, and B7-H2, thereby allowing for the stimulation of na ⁇ ve CD4 + T cells.
- the absence of antigen-presenting cell surface molecules on placenta- and umbilicus-derived cells required for the direct stimulation of naive CD4 + T cells and the presence of PD-L2, an immunomodulating protein, may account for the low stimulation index exhibited by these cells in a MLR as compared to allogeneic controls.
- HGF hepatocyte growth factor
- MCP-1 monocyte chemotactic protein 1
- IL-8 interleukin-8
- keratinocyte growth factor KGF
- basic fibroblast growth factor bFGF
- VEGF vascular endothelial growth factor
- TPO matrix metalloproteinase 1
- ANG2 angiopoietin 2
- PDGF-bb platelet derived growth factor
- TPO thrombopoietin
- HB-EGF stromal-derived factor lalpha
- SDF-lalpha neurotrophic/neuroprotective activity, such as brain-derived neurotrophic factor (BDNF) (Cheng et al.
- BDNF brain-derived neurotrophic factor
- chemokine activity such as macrophage inflammatory protein lalpha (M Pla), macrophage inflammatory protein lbeta (MlPlb), monocyte chemoattractant-1 (MCP-1), Rantes (regulated on activation, normal T cell expressed and secreted), 1309, thymus and activation- regulated chemokine (TARC), Eotaxin, macrophage-derived chemokine (MDC), IL-8).
- M Pla macrophage inflammatory protein lalpha
- MlPlb macrophage inflammatory protein lbeta
- MCP-1 monocyte chemoattractant-1
- Rantes regulated on activation, normal T cell expressed and secreted
- TARC thymus and activation- regulated chemokine
- Eotaxin Eotaxin
- MDC macrophage-derived chemokine
- PPDCs from placenta and umbilicus as well as human fibroblasts derived from human neonatal foreskin were cultured in Growth Medium with penicillin/streptomycin on gelatin-coated T75 flasks. Cells were cryopreserved at passage 11 and stored in liquid nitrogen. After thawing of the cells, Growth Medium was added to the cells followed by transfer to a 15 milliliter centrifuge tube and centrifugation of the cells at 150 x g for 5 minutes. The supernatant was discarded. The cell pellet was resuspended in 4 milliliters Growth Medium, and cells were counted.
- Cells were seeded at 375,000 cells/75 cm 2 flask containing 15 milliliters of Growth Medium and cultured for 24 hours.
- the medium was changed to a serum-free medium (DMEM- low glucose (Gibco), 0.1% (w/v) bovine serum albumin (Sigma), penicillin/streptomycin (Gibco)) for 8 hours.
- Conditioned serum-free medium was collected at the end of incubation by centrifugation at 14,000 x g for 5 minutes and stored at -20°C.
- To estimate the number of cells in each flask cells were washed with PBS and detached using 2 milliliters trypsin/EDTA. Trypsin activity was inhibited by addition of 8 milliliters Growth Medium.
- ELISA assay Cells were centrifuged at 150 x g for 5 minutes. Supernatant was removed, and cells were resuspended in 1 milliliter Growth Medium. Cell number was estimated using a hemocytometer. ELISA assay. Cells were grown at 37°C in 5% carbon dioxide and atmospheric oxygen. Placenta-derived cells (batch 101503) also were grown in 5% oxygen or beta-mercaptoethanol (BME). The amount of MCP-1, IL-6, VEGF, SDF-lalpha , GCP-2 , IL-8, and TGF-beta 2 produced by each cell sample was measured by an ELISA assay (R&D Systems, Minneapolis, MN). All assays were performed according to the manufacturer's instructions.
- the arrays are produced by spotting a 2 x 2, 3 x 3, or 4 x 4 pattern of four to 16 different capture antibodies into each well of a 96-well plate. Following a sandwich ELISA procedure, the entire plate is imaged to capture chemiluminescent signal generated at each spot within each well of the plate. The amount of signal generated in each spot is proportional to the amount of target protein in the original standard or sample.
- MCP-1 and IL-6 were secreted by placenta- and umbilicus-derived cells and dermal fibroblasts (Table 12-1). SDF-lalpha was secreted by placenta-derived cells cultured in 5% O 2 and by fibroblasts. GCP-2 and IL-8 were secreted by umbilicus-derived cells and by placenta-derived cells cultured in the presence of BME or 5% O . GCP-2 also was secreted by human fibroblasts. TGF-beta2 was not detectable by ELISA assay.
- TIMPl, TPO, KGF, HGF, FGF, HBEGF, BDNF, MlPlb, MCP1, RANTES, 1309, TARC, MDC, and IL-8 were secreted from umbilicus- derived cells (Tables 12-2 and 12-3).
- TIMPl, TPO, KGF, HGF, HBEGF, BDNF, MlPla, MCP- 1, RANTES, TARC, Eotaxin, and EL-8 were secreted from placenta-derived cells (Tables 12-2 and 12-3). No Ang2, VEGF, or PDGF-bb were detected.
- hFB human fibroblasts
- PI placenta-derived cells (042303)
- Ul umbilicus-derived cells (022803)
- P3 placenta-derived cells(071003)
- U3 umbilicus-derived cells (071003)
- ND Not Detected.
- hFB human fibroblasts
- PI placenta-derived PPDC
- Ul umbilicus-derived PPDC
- P3 placenta-derived PPDC
- U3 umbilicus-derived PPDC (071003)).
- ND Not Detected.
- Umbilicus- and placenta-derived cells secreted a number of trophic factors. Some of these trophic factors, such as HGF, bFGF, MCP-1 and IL-8, play important roles in angiogenesis. Other trophic factors, such as BDNF and IL-6, have important roles in neural regeneration.
- placenta- and umbilicus-derived cells collectively postpartum-derived cells or PPDCs
- mesenchymal stem cells P3; 1F2155; Cambrex, Walkersville, MD
- osteoblasts P5; CC2538; Cambrex
- adipose-derived cells Artecel, US6555374 Bl
- P6; Donor 2 neonatal human dermal fibroblasts
- All cells were initially expanded for 4 days in DMEM/F12 medium (Invitrogen,
- FBS fetal bovine serum
- bFGF basic fibroblast growth factor
- EGF epidermal growth factor
- Peprotech penicillin/streptomycin
- Cells were then cultured for 1 - 6 hours in an induction medium which was comprised of DMEM/F12 (serum-free) containing 200 mM butylated hydroxyanisole, 10 ⁇ M potassium chloride, 5 milligram/milliliter insulin, 10 ⁇ M forskolin, 4 ⁇ M valproic acid, and 2 ⁇ M hydrocortisone (all chemicals from Sigma, St. Louis, MO). Cells were then fixed in 100% ice-cold methanol and immunocytochemistry was performed (see methods below) to assess human nestin protein expression.
- DMEM/F12 serum-free
- PPDCs umbilicus (022803) Pl l; placenta (042203) Pll
- adult human dermal fibroblasts (1F1853, PI 1) were thawed and culture expanded in Growth Medium at 5,000 cells/cm2 until sub-confluence (75%) was reached.
- Cells were then trypsinized and seeded at similar density as in (A), but onto (1) 24 well tissue culture-treated plates (TCP, Falcon brand, NWR International), (2) TCP wells + 2% (w/v) gelatin adsorbed for 1 hour at room temperature, or (3) TCP wells + 20 ⁇ g/milliliter adsorbed mouse laminin (adsorbed for a minimum of 2 hours at 37°C; Invitrogen).
- NPE Neural Progenitor Expansion medium
- This medium was removed 4 days later and cultures were fixed with ice-cold 4% (w/v) paraformaldehyde (Sigma) for 10 minutes at room temperature, and stained for nestin, GFAP, and TuJl protein expression (see Table Nl-1).
- PPDCs umbilicus (042203) Pll, placenta (022803) Pll
- adult human dermal fibroblasts Pll; 1F1853; Cambrex
- NPE + F + E adult rat neural progenitors isolated from hippocampus
- Umbilicus-derived cells (PI 1; (042203)) were thawed and culture expanded in Growth Medium at 5,000 cells/cm 2 until sub-confluence (75%) was reached. Cells were then trypsinized and seeded at 2,000 cells/cm 2 , onto 24 well laminin-coated plates (BD Biosciences) in the presence of NPE + F (20 nanograms/milliliter) + E (20 nanograms/milliliter). In addition, some wells contained NPE + F + E + 2% FBS or 10% FBS.
- Neural progenitor co-culture protocol Adult rat hippocampal progenitors (062603) were plated as neurospheres or single cells (10,000 cells/well) onto laminin-coated 24 well dishes (BD Biosciences) in NPE + F (20 nanograms/milliliter) + E (20 nanograms/milliliter). Separately, umbilicus-derived cells (042203) Pl l and placenta-derived cells (022803) PI 1 were thawed and culture expanded in NPE + F (20 nanograms/milliliter) + E (20 nanograms/milliliter) at 5,000 cells/cm 2 for a period of 48 hours.
- Cultures were washed with phosphate-buffered saline (PBS) and exposed to a protein blocking solution containing PBS, 4% (v/v) goat serum (Chemicon, Temecula, CA), and 0.3% (v/v) Triton (Triton X-100; Sigma) for 30 minutes to access intracellular antigens.
- Primary antibodies, diluted in blocking solution, were then applied to the cultures for a period of 1 hour at room temperature.
- positive staining represented fluorescence signal above control staining where the entire procedure outlined above was followed with the exception of application of a primary antibody solution.
- Representative images were captured using a digital color videocamera and ImagePro software (Media Cybernetics, Carlsbad, CA). For triple-stained samples, each image was taken using only one emission filter at a time. Layered montages were then prepared using Adobe Photoshop software (Adobe, San Jose, CA).
- PPDCs were plated onto cultures of rat neural progenitors seeded two days earlier in neural expansion conditions (NPE + F + E). While visual confirmation of plated PPDCs proved that these cells were plated as single cells, human-specific nuclear staining (hNuc) 4 days post-plating (6 days total) showed that they tended to ball up and avoid contact with the neural progenitors.
- neural progenitors extended neurites to PPDCs in a way that indicates the progenitors differentiated into neurons and innervated the PPDCs.
- cultures of neural progenitors and PPDCs had more cells of rat origin and larger amounts of differentiation than control cultures of neural progenitors alone, further indicating that plated PPDCs provided soluble factors and or contact-dependent mechanisms that stimulated neural progenitor survival, proliferation, and/or differentiation.
- EXAMPLE 14 Long-Term Neural Differentiation of Postpartum-Derived Cells The ability of umbilicus and placenta-derived cells (collectively postpartum-derived cells or PPDCs) to undergo long-term differentiation into neural lineage cells was evaluated.
- PPDCs were isolated and expanded as described in previous Examples. PPDC Cell Thaw and Plating. Frozen aliquots of PPDCs (umbilicus (022803) Pl l;
- NPE Neural Progenitor Expansion
- NPE media was further supplemented with bFGF (20 nanograms/milliliter, Peprotech, Rocky Hill, NJ) and EGF (20 nanograms/milliliter, Peprotech, Rocky Hill, NJ), herein referred to as NPE + bFGF + EGF.
- Control Cell Plating In addition, adult human dermal fibroblasts (Pll, Cambrex, Walkersville, MD) and mesenchymal stem cells (P5, Cambrex) were thawed and plated at the same cell seeding density on laminin-coated T-75 flasks in NPE + bFGF + EGF.
- fibroblasts, umbilicus, and placenta PPDCs were grown in Growth Medium for the period specified for all cultures.
- Immunocytochemistry After a period of one month, all flasks were fixed with cold 4% (w/v) paraformaldehyde (Sigma) for 10 minutes at room temperature. Immunocytochemistry was performed using antibodies directed against TuJl (Bill Tubulin; 1:500; Sigma, St.
- GFAP glial fibrillary acidic protein; 1:2000; DakoCytomation, Carpinteria, CA. Briefly, cultures were washed with phosphate-buffered saline (PBS) and exposed to a protein blocking solution containing PBS, 4% (v/v) goat serum (Chemicon, Temecula, CA), and 0.3% (v/v) Triton (Triton X-100; Sigma) for 30 minutes to access intracellular antigens. Primary antibodies, diluted in blocking solution, were then applied to the cultures for a period of 1 hour at room temperature.
- PBS phosphate-buffered saline
- Triton Triton X-100
- positive staining represented fluorescence signal above control staining where the entire procedure outlined above was followed with the exception of application of a primary antibody solution.
- Representative images were captured using a digital color videocamera and ImagePro software (Media Cybernetics, Carlsbad, CA). For triple-stained samples, each image was taken using only one emission filter at a time. Layered montages were then prepared using Adobe Photoshop software (Adobe, San Jose, CA).
- Example 14 Mayer-Proschel, M. et al. (1997). Neuron. 19(4): 773-85. (2) Yang, H. et al. (2000). PNAS. 97(24): 13366-71.
- EXAMPLE 15 PPDC Trophic Factors for Neural Progenitor Support
- NPE medium was washed in Neurobasal-A medium (Invitrogen, Carlsbad, CA) containing B27 (B27 supplement; Invitrogen), L-glutamine (4mM; Invitrogen), and penicillin/streptomycin (Invitrogen), the combination of which is herein referred to as Neural Progenitor Expansion (NPE) medium.
- NPE medium was further supplemented with bFGF (20 nanograms/milliliter, Peprotech, Rocky Hill, NJ) and EGF (20 nanograms/milliliter, Peprotech, Rocky Hill, NJ), herein referred to as NPE + bFGF + EGF. Following wash, the overlying meninges were removed, and the tissue minced with a scalpel.
- Minced tissue was collected and trypsin/EDTA (Invitrogen) added as 75% of the total volume. DNAse (100 microliters per 8 milliliters total volume, Sigma, St. Louis, MO) was also added. Next, the tissue/media was sequentially passed through an 18 gauge needle, 20 gauge needle, and finally a 25 gauge needle one time each (all needles from Becton Dickinson, Franklin Lakes, NJ). The mixture was centrifuged for 3 minutes at 250 g. Supernatant was removed, fresh NPE + bFGF + EGF was added and the pellet resuspended.
- the resultant cell suspension was passed through a 40 micrometer cell strainer (Becton Dickinson), plated on laminin-coated T-75 flasks (Becton Dickinson) or low cluster 24-well plates (Becton Dickinson), and grown in NPE + bFGF + EGF media until sufficient cell numbers were obtained for the studies outlined.
- PPDC plating Postpartum-derived cells (umbilicus (022803) P12, (042103) P12, (071003) P12; placenta (042203) P12) previously grown in Growth Medium were plated at 5,000 cells / transwell insert (sized for 24 well plate) and grown for a period of one week in Growth Medium in inserts to achieve confluence.
- Neural progenitor plating Neural progenitors, grown as neurospheres or as single cells, were seeded onto laminin-coated 24 well plates at an approximate density of 2,000 cells / well in NPE + bFGF + EGF for a period of one day to promote cellular attachment.
- transwell inserts containing postpartum cells were added according to the following scheme: (1) Transwell (umbilicus-derived cells in Growth Media, 200 microliters) + neural progenitors (NPE + bFGF + EGF, 1 milliliter) (2) Transwell (placenta-derived cells in Growth Media, 200 microliters) + neural progenitors (NPE + bFGF + EGF, 1 milliliter) (3) Transwell (adult human dermal fibroblasts [1F1853; Cambrex, Walkersville, MD] P12 in Growth Media, 200 microliters) + neural progenitors (NPE + bFGF + EGF, 1 milliliter) (4) Control: neural progenitors alone (NPE + bFGF + EGF, 1 milliliter) (5) Control: neural progenitors alone (NPE only, 1 milliliter) Immunocytochemistry. After 7 days in co-culture, all conditions were fixed with cold
- positive staining represented fluorescence signal above control staining where the entire procedure outlined above was followed with the exception of application of a primary antibody solution.
- Representative images were captured using a digital color videocamera and ImagePro software (Media Cybernetics, Carlsbad, CA). For triple-stained samples, each image was taken using only one emission filter at a time. Layered montages were then prepared using Adobe Photoshop software (Adobe, San Jose, CA).
- TuJl (BIU Tubulin) 1:500 Sigma, St. Louis, MO
- MBP Myelin Basic Protein
- Quantitative analysis of neural progenitor differentiation Quantification of hippocampal neural progenitor differentiation was examined. A minimum of 1000 cells were counted per condition or if less, the total number of cells observed in that condition. The percentage of cells positive for a given stain was assessed by dividing the number of positive cells by the total number of cells as determined by DAPI (nuclear) staining.
- Mass spectrometry analysis & 2D gel electrophoresis In order to identify unique, secreted factors as a result of co-culture, conditioned media samples taken prior to culture fixation were frozen down at -80°C overnight. Samples were then applied to ultrafiltration spin devices (MW cutoff 30 kD).
- umbilicus- and placenta-derived cells induced cell differentiation, the degree of differentiation for all three lineages was less in co-cultures with placenta-derived cells than in co-cultures with umbilicus- derived cells.
- the percentage of differentiated neural progenitors following co-culture with umbilicus- derived cells was quantified (Table 15-2).
- Umbilicus-derived cells significantly enhanced the number of mature oligodendrocytes (MBP) (24.0% vs 0% in both control conditions). Furthermore, co-culture enhanced the number of GFAP+ astrocytes and TuJl+ neurons in culture (47.2% and 8.7% respectively).
- EXAMPLE 16 Transplantation of Postpartum-Derived Cells
- PPDCs postpartum-derived cells
- SCID mice The tissue produced by postpartum-derived cells (PPDCs) transplanted into SCID mice with a biodegradable material was evaluated.
- the materials evaluated were Vicryl non- woven, 35/65 PCL/PGA foam, and RAD 16 self-assembling peptide hydrogel.
- Placenta- and umbilicus-derived cells were grown in Growth Medium (DMEM-low glucose (Gibco, Carlsbad CA), 15% (v/v) fetal bovine serum (Cat. #SH30070.03; Hyclone, Logan, UT), 0.001% (v/v) betamercaptoethanol (Sigma, St. Louis, MO), penicillin/streptomycin (Gibco)) in a gelatin-coated flasks. Sample Preparation.
- DMEM-low glucose Gibco, Carlsbad CA
- fetal bovine serum Cat. #SH30070.03
- Hyclone Logan, UT
- betamercaptoethanol Sigma, St. Louis, MO
- penicillin/streptomycin Gabco
- RAD 16 self-assembling peptides (3D Matrix, Cambridge, MA under a material transfer agreement) was obtained as a sterile 1 % (w/v) solution in water, which was mixed 1:1 with 1 x 10 6 cells in 10% (w/v) sucrose (Sigma, St Louis, MO), 10 mM HEPES in Dulbecco's modified medium (DMEM; Gibco) immediately before use.
- the final concentration of cells in RAD16 hydrogel was 1 x 10 6 cells/100 microliters.
- mice Animal Preparation. The animals were handled and maintained in accordance with the current requirements of the Animal Welfare Act. Compliance with the above Public Laws were accomplished by adhering to the Animal Welfare regulations (9 CFR) and conforming to the current standards promulgated in the Guide for the Care and Use of Laboratory Animals, 7th edition. Mice (Mus Musculus)/Fox Chase SCID/Male (Harlan Sprague Dawley, Inc., Indianapolis, Indiana), 5 weeks of age. All handling of the SCID mice took place under a hood.
- mice were individually weighed and anesthetized with an intraperitoneal injection of a mixture of 60 milligrams/kg KETASET (ketamine hydrochloride, Aveco Co., Inc., Fort Dodge, Iowa) and 10 milligrams/kg ROMPUN (xylazine, Mobay Co ⁇ ., Shawnee, Kansas) and saline.
- KETASET ketamine hydrochloride, Aveco Co., Inc., Fort Dodge, Iowa
- ROMPUN xylazine, Mobay Co ⁇ ., Shawnee, Kansas
- Ophthalmic ointment was applied to the eyes to prevent drying of the tissue during the anesthetic period.
- Subcutaneous Implantation Technique Four skin incisions, each approximately 1.0 cm in length, were made on the dorsum of the mice. Two cranial sites were located transversely over the dorsal lateral thoracic region, about 5-mm caudal to the palpated inferior edge of the scapula, with one to the left and one to the right of the vertebral column. Another two were placed transversely over the gluteal muscle area at the caudal sacro-lumbar level, about 5-mm caudal to the palpated iliac crest, with one on either side of the midline.
- Implants were randomly placed in these sites in accordance with the experimental design.
- the skin was separated from the underlying connective tissue to make a small pocket and the implant placed (or injected for RAD16) about 1-cm caudal to the incision.
- the appropriate test material was implanted into the subcutaneous space.
- the skin incision was closed with metal clips.
- Animal Housing. Mice were individually housed in microisolator cages throughout the course of the study within a temperature range of 64°F - 79°F and relative humidity of 30% to 70%, and maintained on an approximate 12 hour light/12 hour dark cycle. The temperature and relative humidity were maintained within the stated ranges to the greatest extent possible.
- Diet consisted of Irradiated Pico Mouse Chow 5058 (Purina Co.) and water fed ad libitum. Mice were euthanized at their designated intervals by carbon dioxide inhalation. The subcutaneous implantation sites with their overlying skin were excised and frozen for histology. Histology. Excised skin with implant was fixed with 10% neutral buffered formalin (Richard-Allan Kalamazoo, MI). Samples with overlying and adjacent tissue were centrally bisected, paraffin-processed, and embedded on cut surface using routine methods. Five-micron tissue sections were obtained by microtome and stained with hematoxylin and eosin (Poly Scientific Bay Shore, NY) using routine methods.
- EXAMPLE 17 Use of Postpartum-Derived Cells in Nerve Repair Retinal ganglion cell (RGC) lesions have been extensively used as models for various repair strategies in the adult mammalian CNS. It has been demonstrated that retrobulbar section of adult rodent RGC axons results in abortive sprouting (Zeng et al., 1995) and progressive death of the parent cell population (Villegas-Perez et al., 1993). Numerous studies have demonstrated the stimulatory effects of various exogenous and endogenous factors on the survival of axotomized RGC's and regeneration of their axons (Yip and So, 2000; Fischer et al., 2001).
- cell transplants can be used to promote regeneration of severed nerve axons (Li et al., 2003; Ramon-Cueto et al., 2000).
- cell based therapy can be utilized for the treatment of neural disorders that affect the spinal cord, peripheral nerves, pudendal nerves, optic nerves or other diseases/trauma due to injury in which nervous damage can occur.
- Self-assembling peptides have been developed to act as a scaffold for cell- attachment to encapsulate cells in 3-D, plate cells in 2-D coatings, or as microcarriers in suspension cultures.
- Three-dimensional cell culture has required either animal-derived materials (mouse sarcoma extract), with their inherent reproducibility and cell signaling issues, or much larger synthetic scaffolds, which fail to approximate the physical nanometer-scale and chemical attributes of native ECM.
- RAD 16 (NH2-(RADA) 3 -COOH) and KLD (NH2-(KLDL) 3 -COOH) are synthesized in small (RAD16 is 5 nanometers) oligopeptide fragments that self-assemble into nanofibers on a scale similar to the in vivo extracellular matrix (ECM) (3D Matrix, Inc Cambridge, MA). The self-assembly is initiated by mono- or di-valent cations found in culture media or the physiological environment. In the protocols described in this example, RAD 16 was used as a microcarrier for the implantation of postpartum cells into the ocular defect.
- ECM extracellular matrix
- transplants of postpartum-derived cells PPDCs can provide efficacy in an adult rat optic nerve axonal regeneration model.
- Methods & Materials Cells Cultures of human adult PPDCs (umbilicus and placenta) and fibroblast cells (passage 10) were expanded for 1 passage. All cells were initially seeded at 5,000 cells/cm 2 on gelatin-coated T75 flasks in Growth Medium with 100 Units per milliliter penicillin, 100 micrograms per milliliter streptomycin, 0.25 micrograms per milliliter amphotericin B (Invitrogen, Carlsbad, CA). At passage 11 cells were trypsinized and viability was determined using trypan blue staining.
- a glass micropipette with a 30-50 millimeter tip was inserted tangentially through the sclera behind the lens, and two 4-5 microliter aliquots of a 1% retrograde tracer-cholera toxin B (CTB) aqueous solution (List Biologic, Campbell, CA) was injected into the vitreous. Animals were perfused with fixative and optic nerves were collected in the same fixative for 1 hour. The optic nerves were transferred into sucrose overnight.
- CTB retrograde tracer-cholera toxin B
- Rats were given 4 cubic centimeters of urethane and were then perfused with PBS (0.1 molar) then with 4% Para formaldehyde.
- the spinal cord was cut and the bone removed from the head to expose the colliculus.
- the colliculus was then removed and placed in 4% paraformaldehyde.
- the eye was removed by cutting around the outside of the eye and going as far back as possible. Care was given not to cut the optic nerve that lies on the underside of the eye. The eye was removed and the muscles were cut exposing the optic nerve this was then placed in 4% paraformaldehyde.
- Optic nerve regrowth was observed in 4/5 animals transplanted with placenta-derived cells, 3/6 animals transplanted with adult dermal fibroblasts and in 1/4 animals transplanted with umbilicus-derived cells.
- CTB labeling confirmed regeneration of retinal ganglion cell axons, which were demonstrated to penetrate through the transplant area.
- GFAP labeling was also performed to determine the level of glial scarring. The GFAP expression was intensified at the proximal stump with some immunostaining being observed through the reinervated graft. Summary.
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EP04777235.5A EP1641916B1 (en) | 2003-06-27 | 2004-06-25 | Regeneration and repair of neural tissue using postpartum-derived cells |
JP2006517760A JP4950661B2 (en) | 2003-06-27 | 2004-06-25 | Neural tissue regeneration and repair using postpartum cells |
ES04777235.5T ES2568463T3 (en) | 2003-06-27 | 2004-06-25 | Regeneration and repair of neural tissue using postpartum cells derived from the umbilical cord |
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PCT/US2004/020957 WO2005001080A2 (en) | 2003-06-27 | 2004-06-25 | Postpartum-derived cells for use in treatment of disease of the heart and circulatory system |
PCT/US2004/020931 WO2005003334A2 (en) | 2003-06-27 | 2004-06-25 | Postpartum cells derived from umbilical cord tissue, and methods of making and using the same |
PCT/US2004/020956 WO2005001079A2 (en) | 2003-06-27 | 2004-06-25 | Soft tissue repair and regeneration using postpartum-derived cells |
PCT/US2004/020822 WO2005001077A2 (en) | 2003-06-27 | 2004-06-25 | Repair and regeneration of ocular tissue using postpartum-derived cells |
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PCT/US2004/020957 WO2005001080A2 (en) | 2003-06-27 | 2004-06-25 | Postpartum-derived cells for use in treatment of disease of the heart and circulatory system |
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