US20100303868A1 - Ex vivo, fast and efficient process to obtain activated antigen-presenting cells that are useful for therapies against cancer and immune system-related diseases - Google Patents

Ex vivo, fast and efficient process to obtain activated antigen-presenting cells that are useful for therapies against cancer and immune system-related diseases Download PDF

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US20100303868A1
US20100303868A1 US12/680,709 US68070908A US2010303868A1 US 20100303868 A1 US20100303868 A1 US 20100303868A1 US 68070908 A US68070908 A US 68070908A US 2010303868 A1 US2010303868 A1 US 2010303868A1
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Flavio Andrés Salazar Onfray
Mercedes Natalia López Nitsche
Cristián Javier Pereda Ramos
Raquel Elvira Aguilera Insunza
Alejandro Felipe Escobar Álvarez
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Universidad de Chile
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Definitions

  • This invention refers to an ex vivo, fast and efficient process to obtain activated antigen-presenting cells that are useful for therapies against cancer and immune system-related diseases. At the same time, it is related to a cellular composition that contributes to stimulate the activated antigen-presenting cells to induce a specific immune response against tumors in patients with cancer or other pathologies involving immune responses.
  • Cancer is a pathology in which cells with an uncontrolled capacity for growth and spreading are able to invade their originating organs or tissues and spread towards the body through the blood or lymphatic tissues. Its aberrant expansion destroys healthy tissues, producing metabolic unbalances and altering the function of organs, many times causing death. In the light of recent developments, the treatment for this disease has been improved. However, this pathology still remains one of the primary causes of death worldwide.
  • antitumoral immune therapy may be used as a complement for usual treatments of oncological conditions, such as surgery, chemotherapy and radiotherapy.
  • immune therapy Although some types of immune therapy are already a part of the usual treatment of some types of cancer, there are others in a preclinical or clinical trial stage.
  • immune molecules such as interferons, interleukins, colony-stimulating factors and monoclonal antibodies has been of vital importance.
  • a different strategy is the active immunization against tumors, which is commonly known as cancer vaccines.
  • Therapeutic vaccines for cancer disorders are a form of specific immune therapy, whose purpose is stimulating or strengthening a direct response of the patient against the tumor through immunization, for instance with inactivated or radiation exposed tumor cells, or by administering tumor antigen-containing (Ag) vaccines.
  • Tumor-associated antigens or tumor-specific antigens are protein-origin molecules mainly, which are differentially expressed in the tumor and normal tissue, where they become a target for immunological responses.
  • Cancer vaccines are generally provided after the onset of the disease; to this effect complete attenuated cells may be used, as well as cellular compounds or specific antigens with the purpose of stimulating the patient's immune system. These vaccines may be commonly classified as complete tumor cell vaccines or vaccination preparations from tumor antigens. The former may be divided in complete autologous cell vaccines coming from the subject itself and in complete allogeneic cells consisting in a combination of tumor cells of the same histological type but from different patients. These preparations are manufactured in laboratory facilities and they are usually combined with adjuvant.
  • the tumor-associated Ags can be obtained from complete tumor cells, from tumor-purified proteins or peptides, from artificially synthesized peptide sequences or genetic material obtained of the tumors.
  • vaccines of specific proteins/peptides are designed from tumor-associated antigens, which are recognized by T lymphocytes.
  • the antigenic peptide or protein may be administered purified or synthesized as a part of the vaccine composition or by inducing the synthesis of the tumor peptide or antigen into the target cell by transfection.
  • viral vectors such as adenoviruses may be used.
  • adenovirus is the most commonly used virus, retroviruses have also been used with successful results.
  • These viral vectors might also encode additional cytokine genes beside the tumor-associated antigen.
  • the DNA vaccines consisting in plasmids coding tumor Ag have the advantage of acting independently from the subject's MHC haplotype.
  • New strategies are currently being developed for this kind of vaccines involving the fusion of genes, such as coding agents for idiotypic determinants of the immunoglobulin molecule with a sequence of the titanic toxoid antigen, which enables the activation of the immune system's effector mechanisms.
  • Another therapeutic alternative corresponds to the dendritic cell vaccines or professional antigen-presenting cells (APC), which is a technique recently incorporated to clinical practice and seems to be interestingly effective for generating a specific CTL response against tumors and infectious agents.
  • APC professional antigen-presenting cells
  • the success of active immunotherapy in cancer treatment may be affected by multiple factors such as the heterogeneity existing among tumor cells, for instance, the low immunogenicity of tumor antigens and the immune evasion mechanisms developed by tumors to avoid the immunological response.
  • the tumor-associated antigens may be effective targets for cancer vaccines, but they may also be present in normal cells and not be recognized by the immunological system for different reasons, such as the cryptic expression due to the physical orientation or configuration of Ag on the cell surface, the physical separation, the separation by cell membranes or masking by other cell components; lower antigenic expression than the required for immune recognition or a different surface distribution regarding tumor cells.
  • Treg regulatory lymphocytes
  • objectives pursued by the active immune therapy against cancer would be: overcoming the immune suppression produced by tumor-deriving factors, increasing the immunogenicity of antigens that may help eliminating tumors and metastasis and the clinical recovery of patients when treated with any antitumoral vaccine.
  • DC dendritic cell
  • the development of dendritic cell (DC) vaccines is an explored alternative with promissory results.
  • the DCs are originated in the bone marrow from pluripotential progenitors and about 0.5% of total blood mononuclear cells correspond to DC in circulation and they are very hard to maintain in culture conditions (Fearnley D. B. et al. 1999).
  • DCs are a subgroup of leukocytes with a great antigen-presentation capacity and the potential to induce and regulate the immune response (Svane I M et al. 2003, Banchereau J et al. 2003).
  • DCs have proven to be the most effective antigen-presenting cells (APC); this is why they are called professional APCs.
  • DCs are strategically positioned in peripheral tissues in possible antigen-entering areas, where they are able to capture process and present them associated with histocompatibility molecules (HCM).
  • HCM histocompatibility molecules
  • DCs cytoplasmatic prolongations increase as well as the characteristic markers of immature DCs (DCi) decrease; at the same time the expression of co-stimulating molecules begin to increase, such as CD40, CD80 and CD86, CD83, class I and II MHC molecules and the chemokine receptor CCR-7, which recognizes chemokines CCL19 and CCL21, which guide migration of DCs to the T zone of secondary lymphoid organs, where the naive antigen-specific LT clone may be found (Mellman I et al. 2001, Delamarre L et al. 2003).
  • co-stimulating molecules such as CD40, CD80 and CD86, CD83, class I and II MHC molecules and the chemokine receptor CCR-7, which recognizes chemokines CCL19 and CCL21, which guide migration of DCs to the T zone of secondary lymphoid organs, where the naive antigen-specific LT clone may be found (Mellman I et
  • the method described in US20020155108 consists in an ex vivo DC co-culture performed along with soluble antigens, without physical contact, an antibody is included against the soluble antigen in order to form immune complexes which the DCs are able to absorb, process and present on the cell surface.
  • a method is disclosed to obtain DC vaccines with antigen-presenting activity.
  • the mentioned method consists in incubating a DC with antigen-presenting activity with the following components: a suspension of cells containing a DC cellular precursor, for instance bone marrow cells, blood cells from umbilical cord or peripheral blood monocytes; a differentiation-inducing agent, for instance combinations of GM-CSF, IL-4, TNF- ⁇ , stem cells factor and TNF- ⁇ ; and a chemokine.
  • a suspension of cells containing a DC cellular precursor for instance bone marrow cells, blood cells from umbilical cord or peripheral blood monocytes
  • a differentiation-inducing agent for instance combinations of GM-CSF, IL-4, TNF- ⁇ , stem cells factor and TNF- ⁇
  • a chemokine for instance combinations of GM-CSF, IL-4, TNF- ⁇ , stem cells factor and TNF- ⁇ .
  • WO02053176 describes a method to produce autologous APCs loaded with a mixture of at least two lysate of allogeneic melanoma tumor cells. Maturation of DC is induced with TNF, E2 prostaglandin and/or polyribocytidilic acid.
  • the US 2007/0014795 describes in turn a method for activation of antigen presenting cells, which might be DCs.
  • the methods described in the art provide both operating disadvantages and inefficiencies as compared with this invention.
  • classic DCs require a longer in vitro incubation time (7-9 days) which increases the production cost, increasing the use of reagents acting as differentiation factors and culture media, in addition to an increased risk of infection or cell's death.
  • the rate of DCs obtained from blood mononuclear cells (PBMC) is at least three times lower than the obtained by using the method proposed in this invention.
  • the APCs obtained according to this invention have characteristics that make them more effective to be used as anti-tumor therapy in patients with cancer.
  • this invention refers to an extract or lysate of tumor tissue or cells and to a fast an effective method to produce APCs, from pre activated peripheral blood monocytes by differentiation cytokines and matured with components of cell lysate of tumor tissue.
  • Lysate obtained through our treatment have a double function: on one hand, they are able to induce differentiation and maturation of activated monocytes into APCs highly similar to mature DCs and they are also able to provide a wide range of tumor antigens able to induce the activation of T lymphocytes with the potential to recognize and destroy tumor cells.
  • FIG. 1 corresponds to a table showing a comparative evaluation of the efficiency between the method proposed herein of rapid differentiation of dendritic cells (Rapid DC) as compared with the traditional method of seven-day DC production (DC standard). It is noted that from the same number of peripheral blood cells (PBMC), nearly 4 times the quantity of DCs is obtained when using the method proposed in this invention, which in turn allows obtaining a greater quantity of doses for vaccination of patients. Also, the use of fewer differentiation factors and culture medium, the facility and cost of production is reduced to half of the value.
  • PBMC peripheral blood cells
  • FIG. 2 shows the expression of melanoma-associated antigens expressed in some lines of melanoma used to obtain an extract or lysate of tumor cells comprising part of the invention.
  • the expression of melanoma-associated antigens was determined by Immunohistochemistry (*), flow cytometry (#) or RT-PCR ( ⁇ ). The combination of these lines altogether is able to express a wide range of melanoma antigens.
  • FIG. 3 shows the morphology of rapid differentiation dendritic cells (Rapid DC) belonging to this invention, which does not differ from the morphology of standard DCs (7 days). DCs are identified with arrows.
  • FIG. 4 shows monocytes incubated with GM-CSF and IL-4 and stimulated with a lysate obtained from the mixing of melanoma lines Mel 1, Mel 2 and Mel 3 called TRIMEL and TNF- ⁇ . These cells develop the characteristic phenotype of mature DCs within 48 hours (Rapid DC).
  • Rapid DCs were generated and stained with monoclonal antibody (MAb) anti-CD11c (myeloid DCs marker) conjugated with PE to be then read through flow cytometry.
  • the gated population represents the percentage of positive CD11c cells from the total cells obtained after culture (figure is representative staining of 5 different patients).
  • CD11c+ DCs were analyzed for the expression of CD83, CD86, CCR7, CD40, class I MHC and class II MHC. The expression analysis of these markers indicated that Rapid DCs had the characteristic phenotype of mature dendritic cells.
  • FIG. 5 shows images illustrating that the cells obtained through the Rapid DC method had a similar phenotype to cells obtained by the short FastDC protocol, as well as traditional 7-day DCs.
  • Monocytes incubated with GM-CSF and IL-4 for 24 hours were cultured for additional 24 hours with culture medium alone, TNF- ⁇ , TRIMEL alone, TNF- ⁇ and tumor lysate TRIMEL or IL-1 ⁇ +IL-6+INF- ⁇ +PG-E2 (Fast DC cells).
  • the expression of myeloid DCs markers, CD11c+ and DCs maturation markers, such as CD86 and CD83 was determined by flow cytometry.
  • FIG. 6 shows that the combination of melanoma lysate called TRIMEL with TNF- ⁇ induces Rapid DC to a powerful maturation process.
  • the evaluation is done by flow cytometry analysis for CD11c, CD86 and CD83 markers of monocytes treated for 24 hours with IL-4 and GM-CSF and without a later stimulus, only stimulated with TRIMEL or TNF- ⁇ or with TRIMEL and TNF- ⁇ .
  • the bars represent the MFI percentage of positive CD11c cells. This result also indicates that the tumor lysate called TRIMEL is able by itself and without TNF- ⁇ to induce the expression of markers associated with mature DCs.
  • FIG. 7 shows that lysate from normal cells are not able to induce Rapid DC maturation.
  • Lysate were prepared from autologous and allogeneic PBL and they were used to stimulate the Rapid DCs.
  • the expression of CD11c, CD86 and CD83 markers was measured by flow cytometry.
  • the bars represent the fluorescence percentage as regards the maximum fluorescence of positive Colic cells.
  • PBL peripheral blood lymphocytes
  • FIG. 8 shows that tumor lysate other than TRIMEL, made of other three melanoma cell lines is also able to induce Rapid DC maturation process.
  • a tumor lysate called NO TRIMEL lysate was prepared from 3 cell lines, FM 55 (skin melanoma), OCM-1 and OCM-3 (eye melanoma) and the maturation inducing effect was evaluated on monocytes.
  • the expression of CD11c, CD83 and MHC II markers was determined by flow cytometry. Levels of maturation markers are similar to those obtained using TRIMEL. This result indicates that the combination of different melanoma lysate obtained from different individuals is able to induce the maturation process of monocytes into mature DCs.
  • FIG. 9 shows that the Rapid DCs have a low capacity of endocytosis, similar to traditional mature DCs, which is an indication that Rapid DCs are in a final phase of differentiation, that is, optimal for the induction of T lymphocyte activation.
  • a phagocytosis assay was performed with FITC-linked Dextran and the results were measured by flow cytometry. As a control of passive endocytosis cells were kept at 4° C.
  • FIG. 10 shows that Rapid DC secretes IL-12 and IL-10 cytokines.
  • FIG. 11 shows that LTs stimulated with Rapid DC recognize melanoma cells.
  • Autologous PBL were co-cultured for 12 hours with Rapid DC, allogeneic melanoma cells (Mel 1, Mel 2 and 0505 Mel), the NK-sensitive prototype called K562 and rat fibroblast (NIH 3T3).
  • the secretion of IFN- ⁇ was determined by ELISPOT. This result shows that the Rapid DCs are able to stimulate T lymphocytes in vitro with anti-tumor activity.
  • FIG. 12 shows the results of a Phase I clinical trial using Rapid DC for the treatment of 9 patients with malign advanced melanoma, two patients with pulmonary carcinoma, one with ovarian cancer, one with colorectal carcinoma and one with prostate cancer. None of the patients treated showed important adverse effects, and only in some patients, redness of the injection area and local rash was observed, which provides evidence that the treatment is biologically safe and well tolerated. In addition, 70% of patients develop a type IV delayed hypersensitivity in vivo response (DTH) specific against the tumor antigens, which exceeds the studies published before (Escobar et al. Clin. and Exp. Immunol. 2005) where standard DCs produced immunological response in 50% of patients.
  • DTH delayed hypersensitivity in vivo response
  • this invention refers to an extract of cells and/or tumor tissues with the capacity to induce differentiation and activation of APCs.
  • Another aspect of the invention is related to a method to produce DCs ex vivo from peripheral blood monocytes in a shorter time, as compared with the state of the art, where the extract mentioned before is used. DCs produced in this way are useful to make up a therapeutic composition as a vaccine, which is useful in the treatment of cancer and other related diseases.
  • the method uses common blood cells obtained from patients, donors or blood banks, among other sources, from which mononuclear cells are separated. Then, monocytes are selected and incubated with growth factors and cytokines to be then exposed to a tumor lysate, preferably in the presence of a growth factor. Under these conditions, and in less than three days after the ex vivo cultivation, preferably within 48 hours of ex vivo culture, these cells express markers associated with traditional mature dendritic cells and acquire the capacity of inducing responses from in vitro anti-tumor cytotoxic lymphocytes and generate in vivo immunological responses in patients vaccinated with these cells.
  • the lysate of tumor cells might be obtained by different means.
  • the lysate of tumor cells contains a mixture of at least two extracts of tumor cells kept under culture.
  • the lysate of tumor cells is obtained from fresh tumor tissue taken from patients with different types of cancer, such as melanoma and uveal melanoma, prostate, kidney, colorectal, gastric, pulmonary, breast, ovarian, testicle carcinomas and other types of neoplasm.
  • the lysate of tumor cells is obtained from fresh tumor tissue taken from patients with different types of cancer combined with lysate of allogeneic tumor cell lines of the same tumor type.
  • this invention uses cells obtained from blood of patients, donors or blood banks which are separated from the other components of the blood through traditional methods of the art; preferably leukapheresis.
  • leukocytes are selected through the usual methods known in the art, such as density gradient for example.
  • monocytes are separated through traditional methods known by any expert in the art.
  • the capacity of monocytes to adhere to plastic surfaces is used.
  • monocytes selection can also be performed by separation kits which use antibodies against the CD14 molecule coupled to magnetic beads for magnetic selection of the desired cellular type.
  • the peripheral blood mononuclear cells are incubated at 13 ⁇ 10 6 cells per ml, although concentrations between 10 4 and 10 10 , preferably between 10 5 and 10 7 are also allowed in a culture medium free from bovine fetal serum.
  • the culture may take place in proper containers, such as different well number plates, bottles, cell reactors and others. Temperatures between 30 and 40° C. are tolerated; preferentially 37° C. in an atmosphere of about 5% CO 2 should be used for 1 to 4 hours, with an ideal time of about 2 hours.
  • Cells that remained attached to the container (well) correspond to monocytes, and are kept under culture in the presence of 100 to 800 U/ml, preferably between 400 and 600 and with an ideal concentration of 500 U/ml of cytokines such as interleukins preferentially IL-4; and in the presence of 500 to 1,100, preferably between 700 and 900 and more preferably as an ideal concentration around 800 U/ml of at least one growth factor, most preferably GM-CFS.
  • the incubation can be extended for at least 10 hours, although incubation times of more than 18 hours are preferred reaching and ideal time of about 22 hours.
  • the cells can be incubated for at least 10 more hours, ideally 18 hours, and preferentially for about 24 hours.
  • the cells are kept in culture medium alone or ideally supplemented with a growth factor, like TNF- ⁇ , or with the mixture of tumor cells lysate described above or with both components at the same time.
  • the mixture of tumor cells lysate described above may be combined with other pro-inflammatory cytokines such as IFN- ⁇ , IL-6, IL-1 ⁇ or other factors like prostaglandin E2, CpG, thermal shock proteins, Toll-like receptors (TLR) ligands or other factors that activate DCs maturation.
  • pro-inflammatory cytokines such as IFN- ⁇ , IL-6, IL-1 ⁇ or other factors like prostaglandin E2, CpG, thermal shock proteins, Toll-like receptors (TLR) ligands or other factors that activate DCs maturation.
  • TNF- ⁇ might be used at a concentration between 100 pg/ml to 100 ng/ml, ideally between 1 ng/ml to 50 ng/ml, more preferably between 2 ng/ml to 20 ng/ml and ideally around 10 ng/ml.
  • An integral and essential part of this invention is the mixture of lysate or extracts of tumor cells.
  • This is a mixture made up by at least two cell lines of tumors from metastatic tissue deriving from patients with cancer.
  • the tumor cells are selected from malign melanomas and correspond to three cell lines, preferably deriving from gland metastasis.
  • the lysate of tumor cells is obtained from fresh tumor cell derived from patients with different kinds of cancer combined or not with lysate of allogeneic tumor cell lines of the same tumor type. The phenotype of used cells is confirmed through conventional techniques in order to determine the expression of tumor-associated antigens.
  • the cells or tissues are then incubated between 15 minutes and 4 hours, with a preferred timing of 1 and 3 hours ideally around 2 hours at a temperature that range between 39 and 44° C., more preferably between 40 and 43° C. and preferentially near 42° C. in a serum-free culture medium. Later, the cells and/or tissues are placed at physiological temperature again, that is, around 37° C. for 1 to 6 hours, ideally between 2 and 4 hours preferentially 3 hours before being lysate.
  • Cells treated in this way are subject to 1 to 6 freezing and thawing cycles, preferably 2 to 4 cycles, and ideally 3 cycles are used.
  • the cells are introduced into a tank containing liquid nitrogen, which freezes them instantly and then thawed to 35° to 40° C.
  • the lysate or extract obtained is subject to homogenization by ultrasound for 30-second 2 to 10 cycles at 30 to 40 KHz in a standard sonicator. Finally, the lysate or extract of each tissue is irradiated at doses ranging between 40 and 120 Gy, preferably between 70 and 90 Gy and preferentially around 80 Gy. Later, the lysate may be mixed or not on equal parts or individually used depending on the type of tumor to be treated.
  • the lysate or extract obtained is used in the culture of dendritic cells at a concentration between 1 ⁇ g/ml and 1 mg/ml and ideally around 100 ⁇ g/ml.
  • a quite outstanding development of this invention is that the extract of tumor cell lysate described is able to stimulate the differentiation of dendritic cells from preactivated monocytes with differentiation cytokines. This maturation induction and differentiation occurs even in the absence of other cytokines or maturation factors existing in the state of the art. In these cases, it was noted that after hours of treatment with the lysate, monocytes showed a morphology equivalent to DCs classically incubated for 7 days ( FIG. 3 ), which confirms the advantages of the method proposed and the prominent qualities of the extract developed.
  • the monocytes activated with tumor cells extracts showed the CD11c membrane marker expression, which is characteristic of the myeloid-type DCs in addition to the expression of a number of membrane markers characteristic of mature DCs, such as MHC I and MHC II, CD83, CD86, CD40 and CCR7 ( FIGS. 4 to 6 ).
  • a key feature of this invention is indeed related to the role played by the components of tumor cells in the differentiation of monocytes to DCs and their later maturation. There is indeed some background information in the state of the art on the capacity of some necrotic tumor cells of inducing DC maturation (Bhardwaj N. et al 2000, J Exp Med. 191:411-6; Escobar et al. 2005, Clin. Exp. Immunol.
  • Another aspect of the invention refers to the pharmaceutical composition or vaccine obtained with DCs produced under the methods described above.
  • This invention provides evidence that DCs obtained under the method hereby invented; corresponding to rapid differentiation DCs has the power of inducing potent immune anti-tumor responses.
  • This quality is reflected in the fact that T lymphocytes co-cultured with rapid DCs are able to produce inflammatory cytokines such as interferon- ⁇ and TNF- ⁇ and recognize and destroy lines of allogeneic melanomas through cytolysis ( FIG. 11 ).
  • the cells obtained through the method described herein are able of inducing the proliferation of specific T lymphocytes against tumor cells.
  • Another fundamental outcome of the invention corresponds to the use of dendritic cells obtained under method of the invention in patients with melanoma, other kinds of cancer or another type of immune response-associated diseases ( FIG. 12 ).
  • the method of this invention allows obtaining DCs that may be incorporated to vaccines to treat individuals suffering from different kinds of cancer.
  • blood is obtained through a standard method to obtain blood by-products called leukapheresis.
  • a volume equal to 2 blood volemia is obtained from each patient.
  • Blood is processed in a biohazard laboratory.
  • the leukapheresis product is diluted in PBS in a 1:1 dilution. Then, this product is separated by a density gradient called LymphoprepTM as described in the state of the art.
  • the white fraction of blood consisting in the peripheral blood mononuclear cells (PBMC) is washed three times with PBS and then placed in culture bottles (Nunc T75) at a concentration that ranges between 10 and 40 ⁇ 10 6 of PBMC/ml of a serum-free culture medium, concentrations between 20 and 30 ⁇ 10 6 of PBMC/ml of a medium are used and ideally 25 ⁇ 10 6 of PBMC/ml of a medium (serum free).
  • the PBMCs are cultivated in cell reactors or in roller-type bottles or cultivation bags, keeping the concentration indicated above. The cultivation is supplemented with cytokines such as IL-4 and GM-CSF as already described.
  • the maturation factors are added, which correspond to tumor lysate alone or in presence of cytokines and/or differentiation factors, preferably TNF- ⁇ as already described.
  • DCs are harvested, washed and frozen in 1 ml of freezing medium in cryovials at doses between 1 and 50 ⁇ 10 6 of DCs, preferably between 20 and 30 ⁇ 10 6 in 500 ⁇ l of freezing medium.
  • the freezing medium consists in 90% de-supplemented autologous plasma treated at 56° C. for inactivation of complement for 20 minutes and 10% dimethylsulfoxide (DMSO). Vials are then frozen using isopropanol freezing chambers and kept in liquid nitrogen.
  • the vial is thawed at 37° C. and mixed with 150 ⁇ l of KLH adjuvant (hemocyanin deriving from the Keyhole limpet mollusk) at a concentration of 1 ⁇ g/ml and intradermally injected into one of the patient's limbs.
  • KLH adjuvant hemocyanin deriving from the Keyhole limpet mollusk
  • This process can be repeated between 2 and 10 times, preferably between 3 and 5 times and ideally 4 times, at 7 to 30 day intervals, preferably 10 days.
  • Each immune therapy consists in 4 immunization cycles that may be repeated every 6 months or every year according to the decision of the attending physician.
  • Rapid DC The production process of the antigen presenting cells called Rapid DC is described above.
  • the method is rapid, efficient and cost-effective, thus allowing training antigen presenting cells similar to DCs from peripheral blood monocytes, so that in a short time they may express surface markers according to their function and are able to trigger an immune response.
  • leukocytes are obtained from the blood through leukapheresis. These cells are separated through density gradient using LymphoprepTM in order to eliminate red cells excess. From the fraction of leukocytes, monocytes are separated using their characteristic capacity of adhering to plastic.
  • peripheral blood mononuclear cells are incubated at a concentration of 13 ⁇ 10 6 of cells by ml, in a culture medium free from bovine fetal serum called AIM-V (Life Technologies, USA). Culture is done in wells at 37° C. in an atmosphere of about 5% CO 2 for 2 hours.
  • AIM-V bovine fetal serum
  • the cells remaining adhered to the well correspond to monocytes, and are kept under culture in the presence of 500 U/ml of IL-4; and 800 U/ml of GM-CFS.
  • the cells remain under the above mentioned culture conditions for about 22 hours.
  • the cells are incubated for at least further 24 hours.
  • the cells are kept in a medium supplemented with 10 ng/ml of TNF- ⁇ , and with the mixture of tumor cells lysate as described in this invention.
  • a mixture of lysate or extracts of tumor cells may be used in this invention in order to induce DCs.
  • This mixture is manufactured from three melanoma cell lines obtained from metastatic tissue from patients with malign melanoma, which will be called TRIMEL.
  • TRIMEL metastatic tissue from patients with malign melanoma
  • the cells used are checked through conventional techniques in order to determine the expression of melanoma-associated antigens.
  • Cells or tissues are then incubated for 2 hours at a temperature of 42° C. in a serum-free culture medium. Later, the cells and/or tissues are placed at physiological temperature again, at near 37° C. for 3 hours before being lysate.
  • the cells treated in this way are subject to 3 cycles of freezing and thawing. For each freezing cycle, cells are introduced to a tank containing liquid nitrogen, being instantly frozen and they are then thawed at 37° C.
  • the lysate or extract obtained is subject to a homogenization of 4 cycles of 30-second ultrasound (40 to 40 KHz) in a standard sonicator. Finally the lysate or extract of each tissue is irradiated to 80 Gy doses. Lysate are mixed in equal parts and used for the in vitro activation of monocytes of patients with melanoma. The lysate or extract obtained may be used for the culture of dendritic cells.

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CN114288396A (zh) * 2021-12-21 2022-04-08 皖南医学院第一附属医院（皖南医学院弋矶山医院） 一种肿瘤个体化dc疫苗、制备方法及应用

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