JP2022045297A - Tissue repairing agent, method of using tissue repairing agent and screening method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tissue repairing agent capable of suppressing a plurality of cytokines involved in a cytokine storm, and repairing a tissue damaged by the cytokine storm.

SOLUTION: A tissue repairing agent includes microparticles derived from culture supernatant of dental pulp-derived stem cells, adipose-derived stem cells, bone marrow-derived stem cells, umbilical cord-derived stem cells, or immortalized stem cells thereof, and the microparticles include an effective amount or more of extracellular superoxide dismutase (SOD3) which can repair a tissue or a cell damaged by a cytokine storm. The tissue repairing agent, a method of using the tissue repairing agent, and a screening method that repair the tissue damaged by the cytokine storm through suppression of the cytokine storm.

SELECTED DRAWING: Figure 3

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a tissue repair agent, a method of using the tissue repair agent, and a screening method.

<Cytokine storm>
Cytokine is a general term for proteins involved in inflammatory and immune responses, and more than hundreds of them are known. Cytokines each have various activities, and they maintain or regulate biological functions by interacting in a well-balanced and coordinated manner. Normally, cytokines are produced and released by an immune response to infectious diseases, but for some reason the production and release of cytokines become disordered and the concentrations of multiple types of cytokines in the blood rise abnormally, resulting in tissues in the body. May be damaged. A state in which the concentration of cytokines in the blood rises abnormally is called a cytokine storm (hytokine storm).

Known causes of cytokine storms and diseases that cause cytokine storms include infectious diseases, drug administration, severe surgical invasion, sepsis, systemic inflammatory syndrome (SIRS), disseminated intravascular coagulation (DIC), and multiple organ failure. ing. The most common cause among these is sepsis, and recently it is known that viremia, particularly COVID-19, causes a cytokine storm (Non-Patent Document 1; Inflammation and Regeneration (2020) 40:14).

In animal experiments, administration of lipopolysaccharide (LPS. Endotoxin) induces symptoms of septicemia such as increased concentration of inflammatory cytokines and can induce cytokine storms (Non-Patent Document 2: Medical Hypotheses (2020) 144,109865). ..

<Problems with conventional immunosuppressants>
As a method for suppressing a cytokine storm, a method for suppressing the amount of cytokines such as inflammatory cytokines by using an anti-interleukin (IL) -6 antibody such as tosirizumab or an immunosuppressive agent such as a steroid is widely known. For example, in Non-Patent Document 3 (Nature communications (2016) 7: 11498), when an anti-IL-6 antibody was administered to a mouse to which LPS was administered, the mouse to which the control antibody was administered was 96 hours after LPS administration. It is stated that the survival rate was 75% under the condition that all died.
However, methods of suppressing inflammatory cytokines with anti-IL6 antibodies, immunosuppressive agents such as steroids, etc. are insufficient to suppress cytokine storms and cannot repair (nearby) tissues where cytokine storms have occurred. There was a problem. Therefore, in recent years, it is considered that even if a cytokine storm is treated with an immunosuppressive agent, sequelae derived from the cytokine storm remain.

Patent No. 6327647

Information and Generation (2020) 40:14 Medical Hypotheses (2020) 144,109865 Nature communications (2016) 7: 11498 Stem Cell Rev and Rep (2020) 6: 548-559) Cell Biosci (2020) 10:22 ANTIOXI DANTS & REDOX SIGNALING (2020), 33, 2 STEM CELLS AND DEVEROPMENT (2020), 29, 12, 747-754 CYTOTHEAPY 00 (May 2, 2000) 1-4 Cells (2019) 8, 1605 Front. Bioeng. Biotechnol. (2020), 8:554 Cells (2019) 8, 1240 J. Neurochem. (2010) 114, 1569-1580 Mol Genet Genomic Med. (2019) 7: e831

It is known that a culture supernatant of mesenchymal stem cells, that is, a composition containing fine particles such as unisolated exosomes, suppresses cytokine-related inflammation. For example, Patent Document 1 is a composition for preventing or treating an inflammatory disease, which comprises a culture supernatant obtained by culturing dental pulp stem cells, wherein the inflammatory disease includes fulminant hepatitis, acute hepatitis, and chronic hepatitis. A composition selected from the group consisting of hepatitis, liver cirrhosis, acute interstitial pneumonia, chronic interstitial pneumonia, pulmonary fibrosis, inflammatory autoimmune disease and ischemic heart disease is described. Patent Document 1 [0033] describes systemic inflammation as an inflammatory disease, such as shock induced by cancer chemotherapy in response to pre-inflammatory cytokines (eg, pre-inflammatory cytokine-related shocks). .. However, in Patent Document 1, the exosomes of mesenchymal stem cells have not been investigated.

An object to be solved by the present invention is to provide a tissue repair agent capable of suppressing a plurality of cytokines involved in a cytokine storm and repairing a tissue damaged by the cytokine storm.

<Relationship between SOD3 and cytokine storm>
In the presence of IFNγ and TNF, extracellular superoxide dismutase (SOD3) is known to reduce tissue damage and reduce inflammation (Non-Patent Document 4; Stem Cell Rev and Rep (2020) 6: 548. -559).
It is known that MSCs secrete SOD3, and it is known that SOD3 secreted from MSCs can repair tissues by antioxidant action and immunomodulation (Non-Patent Document 5; Cell Biosci (2020) 10: 22), but there is no description about exosomes.
SOD3 is low in the lungs of the elderly, suggesting that this is associated with the aggravation of COVID-19 derived from cytokine storms (Non-Patent Document 6; ANTIOXI DANTS & REDOX SIGNALING (2020)). , 33, 2).

<Relationship between MSC exosomes and cytokine storms (no suggestion of SOD3)>
Although it is known that MSC exosomes are used to suppress cytokine storms, it is not known that SOD3 is involved in cytokine suppression of MSC exosomes.
For example, mesenchymal stem cells (MSCs) isolated from fat, bone marrow, umbilical cord or MSC exosomes isolated from their culture supernatants suppress inflammatory cytokines or tissue damaged by cytokine storms. The effect of repair is described in the abstract of Non-Patent Document 2 (Medical Cytokines (2020) 144,109865) and the right column on page 2, but SOD3 is not described.
Cytokine storm suppression and treatment regimens by MSC exosomes are described in Non-Patent Document 1 (Inflammation and Regeneration (2020) 40:14) from page 3 right column to page 4 left column, but SOD3 is described. do not have.
Downregulation of cytokine storms by bone marrow-derived MSC exosomes is described in Non-Patent Document 7 (STEM CELLS AND DEVEROPMENT (2020), 29, 12, 747-754), but not SOD3.
It is known that cytokine storm is associated with COVID-19 pneumonia and that the method using extracellular vesicles (exosomes) of mesenchymal stem cells (MSC) is effective for the treatment of COVID-19 infection. (Non-Patent Document 8; Cytokine 00 (May 2, 2000) 1-4), but SOD3 is not described.
In Non-Patent Document 9 (Cells (2019) 8, 1605), MSC exosomes activate autophagy through delivery of mRNA and miRNA as an action to suppress inflammation induced by LPS administration, and apoptosis of damaged tissues. , Suppresses necrosis and oxidative stress and promotes regeneration, but not SOD3.
According to Non-Patent Document 10 (Front. Bioeng. Biotechnol. (2020), 8: 554.), Cytokine storm-state cells and tissues are subjected to oxidative stress, and administration of MSC or exosome suppresses inflammation and oxidative stress. In addition to suppression, it is described that lung regeneration is possible, but SOD3 is not described.

<Tissue repair by MSC exosomes (no suggestion of SOD3 or cytokine storm)>
Non-Patent Document 11 (Cells (2019) 8, 1240) describes that MSC exosomes regenerate damaged kidneys, but does not describe SOD3 or cytokine storms.

<Relationship between MSC and SOD3 (no suggestion of exosomes or cytokine storms)>
Non-Patent Document 12 (J. Neurochem. (2010) 114, 1569-1580) describes that SOD3 secreted by bone marrow-derived MSC protects nerve cells, but does not describe exosomes.
Non-Patent Document 13 (Mol Genet Genometric Med. (2019) 7: e831) describes that MSCs that highly express SOD3 suppress ischemic stroke, but does not describe exosomes.

<New findings in the present invention>
The present inventor has found that microparticles such as exosomes derived from the culture supernatant of specific mesenchymal stem cells contain a large amount of extracellular superoxide dismutase (SOD3) and exhibit high SOD activity.
Not only do these microparticles themselves directly suppress inflammatory cytokines and the like in cytokine storms induced by LPS administration, but also the tissues in which SOD3 contained in these microparticles is damaged in the presence of IFNγ and TNFα among the cytokines. We have found that it has a synergistic effect of advancing the restoration of.

<Differences in mechanism of action from conventional cytokine storm inhibitors, application to the elderly>
So far, it has been known that the SOD3 protein is present in exosomes. However, it is the first finding by the present inventor that the SOD3 activity of exosomes derived from the culture supernatant of a specific mesenchymal stem cell is very high and contains more than an effective amount capable of repairing a tissue damaged by a cytokine storm. .. Without this finding, it is not possible to come up with a tissue repair agent that can suppress cytokines involved in cytokine storms and repair tissues damaged by cytokine storms. Has a completely different mechanism of action.
Furthermore, elderly people with low SOD3 (Non-Patent Document 6; ANTIOXI DANTS & REDOX SIGNALING (2020), 33, 2) are expected to be unable to repair tissues simply by suppressing cytokines due to low SOD3. According to the invention, the tissue damaged by the cytokine storm in the elderly can be remarkably repaired.

As a result of diligent studies to solve the above problems, the present inventors have found that fine particles such as exosomes derived from the culture supernatant of specific mesenchymal stem cells contain extracellular superoxide dismutase (SOD3). And it was found to show high SOD activity. Then, the present inventors have found that by using these fine particles, a plurality of cytokines involved in a cytokine storm can be remarkably suppressed.
Specifically, the present invention and preferred configurations of the present invention are as follows.

[1] Containing fine particles derived from dental pulp-derived stem cells, adipose-derived stem cells, bone marrow-derived stem cells, umbilical cord-derived stem cells, or culture supernatants of these immortalized stem cells.
Fine particles contain extracellular superoxide dismutase (SOD3) in excess of an effective amount capable of repairing tissues or cells damaged by cytokine storms.
A tissue repair agent that repairs tissues damaged by cytokine storms through suppression of cytokine storms.
[2] The tissue repair agent according to [1], wherein the fine particles are exosomes.
[3] The tissue repair agent according to [1] or [2], wherein the fine particles are fine particles purified from the culture supernatant.
[4] Any one of [1] to [3] that suppresses IL-2, IL-4, IL-6, IL-10, IL-17, IFNγ and TNFα in cells or blood. Tissue repair agent described in.
[5] In any one of [1] to [4], when a tissue repair agent is administered to a human or a non-human animal in a cytokine storm state, the survival rate is enhanced as compared with the case where the tissue repair agent is not administered. The tissue repair agent described.
[6] The tissue repair agent according to any one of [1] to [5], wherein the fine particles contain SOD3 in an amount of 1.0 ng / mg or more per 1 mg of the fine particles.
[7] The tissue repair agent according to any one of [1] to [6], which has a SOD3 activity of 0.4 unit / μg or more.
[8] The tissue repair agent according to any one of [1] to [7], which contains 0.01 × 10 ⁸ particles / ml or more of fine particles.
[9] The tissue repair agent according to any one of [1] to [8], which contains 2.0 × 10 ⁹ particles / ml or more of fine particles.
[10] The dental pulp-derived stem cells, adipose-derived stem cells, bone marrow-derived stem cells or umbilical cord-derived stem cells are human dental pulp-derived stem cells, human adipose-derived stem cells, human bone marrow-derived stem cells or human umbilical cord-derived stem cells, [1] to [9]. The tissue repair agent according to any one.
[11] The tissue repair agent according to any one of [1] to [10], wherein the fine particles are fine particles derived from the culture supernatant of dental pulp-derived stem cells.
[12] The tissue repair agent according to any one of [1] to [11], wherein the tissue damaged by the cytokine storm is lung tissue.
[13] The tissue repair agent according to any one of [1] to [12], wherein the dental pulp-derived stem cell, adipose-derived stem cell, bone marrow-derived stem cell or umbilical cord-derived stem cell is genetically modified to highly express SOD. ..
[14] The tissue repair agent according to any one of [1] to [13], which comprises at least one of an anti-IL-6 antibody and a steroid.
[15] The tissue repair agent according to any one of [1] to [14] is administered to humans or non-human animals.
Reduces the amount of cytokines in the cells or blood of humans or non-human animals, and
A method of using a tissue repair agent that repairs tissue damaged by a cytokine storm through suppression of the cytokine storm.
[16] The method for using a tissue repair agent according to [15], wherein the tissue repair agent is used in combination with at least one of an anti-IL-6 antibody and a steroid.
[17] A screening method for factors or combinations thereof that are effective for tissue repair to repair tissues damaged by cytokine storms through suppression of cytokine storms.
Extracellular superoxide dismutase (SOD3) contains one or more components contained in the culture supernatant obtained by culturing dental pulp-derived stem cells, adipose-derived stem cells, bone marrow-derived stem cells, umbilical cord-derived stem cells, or immortalized stem cells thereof. A screening method comprising a step of supplying to an evaluation system for evaluating the characteristics of SOD3.
[18] A tissue repair agent containing a component obtained by evaluating the characteristics related to SOD3 by the screening method according to [17].
The component is derived from dental pulp-derived stem cells, adipose-derived stem cells, bone marrow-derived stem cells, umbilical cord-derived stem cells, or culture supernatants of these immortalized stem cells.
The component contains extracellular superoxide dismutase (SOD3) in an effective amount or more capable of repairing tissues or cells damaged by a cytokine storm.
The component satisfies at least one of the fact that SOD3 is contained in an amount of 1.0 ng / mg or more per 1 mg of the component and that the SOD3 activity is 0.3 unit / μg.
A tissue repair agent that repairs tissues damaged by cytokine storms through suppression of cytokine storms.

According to the present invention, it is possible to provide a tissue repair agent capable of suppressing a plurality of cytokines involved in a cytokine storm and repairing a tissue damaged by the cytokine storm.

FIG. 1 is a graph showing the protein amount of SOD3 in DMEM medium used as a tissue repair agent or control of each example. FIG. 2 shows the elapsed time after LPS administration when a single dose of physiological saline (PBS control) used as a tissue repair agent or control of each example was administered to mice administered with lipopolysaccharide (LPS). It is a graph which showed the relationship between the survival rate and the survival rate. FIG. 3 is a graph showing the relationship between the elapsed time after LPS administration and the survival rate when the tissue repair agent or PBS control of each example was administered twice to LPS-administered mice. FIG. 4 shows the elapsed time and survival rate after LPS administration when the tissue repair agent of Example 1, the culture supernatant of dental pulp-derived stem cells or the PBS control was administered twice to the mice administered with LPS. It is a graph showing the relationship. FIG. 5 is a graph showing the relationship between the elapsed time after LPS administration and the survival rate when the tissue repair agent, pulp-derived stem cells or PBS control of Example 1 was administered to the LPS-administered mice. be.

Hereinafter, the present invention will be described in detail. The description of the constituent elements described below may be based on typical embodiments and specific examples, but the present invention is not limited to such embodiments. In addition, the numerical range represented by using "-" in this specification means the range including the numerical values before and after "-" as the lower limit value and the upper limit value.

[Tissue repair agent]
The tissue repair agent of the present invention contains fine particles derived from dental spinal cord-derived stem cells, adipose-derived stem cells, bone marrow-derived stem cells, umbilical cord-derived stem cells or culture supernatants of these immortalized stem cells, and the fine particles are extracellular superoxide dysmutase ( SOD3) is contained in an effective amount or more capable of repairing a tissue or cell damaged by a cytokine storm, and the tissue damaged by the cytokine storm is repaired through suppression of the cytokine storm.
According to the tissue repair agent of the present invention, a plurality of cytokines involved in a cytokine storm can be suppressed, and tissues damaged by the cytokine storm can be repaired.
Hereinafter, preferred embodiments of the tissue repair agent of the present invention will be described.

The tissue repair agent of the present invention repairs tissue damaged by a cytokine storm through suppression of the cytokine storm.
Repair of damaged tissue includes tissue regeneration, partial regeneration, scarring repair, protection, and the like.
Tissue regeneration means that the damaged tissue is morphologically and functionally restored to the same extent as the original tissue. In this case, it is preferred that the damaged tissue is supplemented with tissue defects by the same cells that make up the original tissue.
Partial regeneration of tissue means that the damaged tissue is restored to some extent, though not morphologically and functionally equivalent to the original tissue. Again, it is preferred that the damaged tissue be replenished with tissue defects by the same cells that make up the original tissue.
Tissue scar repair means that damaged tissue is restored leaving scars (replaced by granulation cells and collagen fibers). In this case, the damaged tissue may be restored to the same extent as the original tissue, either morphologically or functionally.
Tissue protection means suppressing the further increase in the degree of damage to the damaged tissue.
Among these, it is preferable that the tissue repair agent of the present invention can regenerate or partially regenerate the tissue.

In the present invention, the tissue repair agent of the present invention preferably has SOD3 activity because the fine particles contain extracellular superoxide dismutase (SOD3) in an effective amount or more capable of repairing tissues or cells damaged by a cytokine storm. The tissue repair agent of the present invention preferably contains 1.0 ng / mg or more of SOD3, more preferably 3.0 ng / mg or more, particularly preferably 6.0 ng / mg or more, and 10.0 ng / mg. It is more preferable to include the above. A preferred embodiment of the tissue repair agent of the present invention is an embodiment in which SOD3 activity is further enhanced by containing SOD3 in a preferably high concentration. The tissue repair agent of the present invention preferably has a SOD3 activity of 0.3 unit / μg or more, more preferably 1.0 unit / μg or more, and particularly preferably 3.0 unit / μg or more. More preferably, it is 0.0 unit / μg or more.
It is difficult to enhance SOD3 activity if the microparticles do not contain extracellular superoxide dismutase (SOD3) in excess of an effective amount capable of repairing tissues or cells damaged by cytokine storms. A preferred embodiment of the tissue repair agent of the present invention is an embodiment in which the SOD3 activity is further enhanced by containing specific fine particles sufficiently containing SOD3 at a high concentration.

<Tissue damaged by cytokine storm>
The types of tissues that are damaged by the cytokine storm and can be repaired by the tissue repair agent of the present invention are not particularly limited, and all tissues can be mentioned. Tissues that are damaged by the cytokine storm and can be repaired by the tissue repair agents of the present invention are preferably all organs, trachea, nerves and blood vessels, including lung tissue, heart tissue, liver tissue, biliary tissue, spleen tissue and kidney tissue. , Esophageal tissue, gastric tissue, small intestinal tissue, large intestine tissue, rectal tissue, bladder tissue, tracheal tissue, nerve tissue, thyroid tissue, vascular tissue, more preferably lung tissue, tracheal tissue, vascular tissue. Preferable, more preferably lung tissue.

<Suppression of cytokine storm>
(Explanation of each type of cytokine)
The cell repair agent of the present invention suppresses cytokines when repairing tissues damaged by cytokine storms through suppression of cytokine storms. There are no particular restrictions on the cytokines that are suppressed. Examples of cytokines that are suppressed include IL-2, IL-4, IL-6, IL-10, IL-17, IFNγ and TNFα. Other cytokines that are suppressed include IL-1, IL-18, MIG, MIP-1α and the like.

IL-1 is an inflammatory cytokine involved in inflammation and infection defense.
IL-2 is a cytokine involved in cell immunity. Overexpression of IL-2 leads to a selective increase in regulatory T cells (Tregs), a subset of T cells. Treg exerts the effect of maintaining peripheral tolerance by suppressing the immune response of other cells. Disruption of peripheral tolerance is thought to cause autoimmune disease in humans. Therefore, it is believed that Treg's immunosuppressive ability prevents the development of autoimmune diseases. In addition, Tregs are also involved in cancer, and solid tumors and hematological malignancies are accompanied by an increase in the number of Tregs (see [0007] in JP-A-2020-002154).
IL-4 is a non-overlapping cytokine involved in the differentiation of helper T cells into the Th2 (helper T2 type) subset, and Th2 promotes the differentiation of immature B cells into IgE-producing plasma cells. IgE levels are elevated in allergic asthma. Therefore, IL-4 is associated with the development of allergic asthma (see [0008] of JP-A-2020-002154).
IL-6 is a B cell differentiation factor; a B cell stimulator-2; a hepatocyte stimulator; a hybridoma growth factor; and a plasmacytoma growth factor. IL-6 is a representative inflammatory cytokine and also regulates acute inflammatory responses, regulates specific immune responses including B and T cell differentiation, bone metabolism, platelet production, epithelial proliferation, menstruation, nerve cell differentiation, It is a multifunctional cytokine involved in inflammatory reactions that occur in neuroprotection, aging, cancer, and Alzheimer's disease. IL-6 plays a role in the development of numerous diseases and disorders, including fatigue, cachexia, autoimmune disorders, skeletal disorders, cancer, heart disorders, obesity, diabetes, asthma, Alzheimer's disease and multiple sclerosis. (See [0002] to [0005] in JP-A-2019-047787).
IL-10 is a homodimer protein of 160 amino acid residues produced by T cells, macrophages and dendritic cells. IL-10 is known to be involved in macrophage function suppression, B cell activation, etc. (see [0052] in Rev. 2018/212237). It is also an anti-inflammatory cytokine.
IL-17 is a 132 amino acid residue protein produced by CD4 memory T cells and Th17 cells. IL-17 is known to be involved in the production of inflammatory cytokines from macrophages, epithelial cells, endothelial cells, fibroblasts and the like (see [0053] in Rev. 2018/212237).
IL-18 is released when strong stress is applied to cells due to virus infection or active oxygen in cancer.
IFN (interferon) has functions such as inhibition of viral replication and activation of immune cells (for example, natural killer cells and macrophages). IFNs are divided into type I IFNs, type II IFNs, and type III IFNs. Among them, IFNγ, which is a type II IFN, is a multifaceted cytokine produced by activated immune cells and induces cellular responses such as increased macrophage activity, increased expression of MHC molecules, and increased NK cell activity. (See [0209] of JP-A-2020-522254).
TNF (Tumor Necrosis Factor) is a typical inflammatory cytokine. As TNF, TNFα, TNFβ and LTβ are known. Among them, TNFα mediates a number of important living functions, including structural and functional organization of secondary lymphatic organs, apoptosis and antitumor activity, inhibition of viral replication, immunomodulation and inflammation. TNF also plays an important role in the pathogenic development of autoimmune diseases, acute phase reactions, septic shock, fever and cachexia (see [0004] in JP-A-2020-079306).
MIG is a cytokine that controls the type 1 immune response. It is produced from macrophages, epithelial cells, vascular endothelial cells, etc., and causes Th1 cells, CD8T cells, some macrophages, etc. to migrate to the inflamed site.
MIP-1α is a cytokine produced in response to inflammation from macrophages, fibroblasts, epithelial cells, vascular smooth muscle cells and the like.

Among these cytokines, IFNγ and TNFα are important. IFNγ and TNFα present in the case of cytokine storms can coordinate with exosome SOD3 (see Stem Cell Rev and Rep (2020) 6: 548-559) to repair tissue damage caused by cytokine storms. It is preferable that IFNγ and TNFα are not completely suppressed and remain to some extent from the viewpoint of facilitating the repair of tissue damage caused by the cytokine storm.

The tissue repair agent of the present invention comprises at least two of the group consisting of IL (interleukin) -2, IL-4, IL-6, IL-10, IL-17, IFNγ and TNFα in cells or blood. It is preferable to suppress cytokines, and it is more preferable to suppress at least 4 types of cytokines in these groups. It is particularly preferable that the tissue repair agent of the present invention suppresses all of IL-2, IL-6, IL-10, IL-17, IFNγ and TNFα, and IL-2, IL-4, IL-6 and IL are particularly preferable. It is more preferable to suppress any of -10, IL-17, IFNγ and TNFα.
In addition, the tissue repair agent of the present invention preferably enhances extracellular superoxide dismutase (SOD3) activity when a cytokine storm inhibitor is administered to a human or non-human animal in a cytokine storm state.
In addition, the tissue repair agent of the present invention preferably increases the survival rate when a cytokine storm inhibitor is administered to a human or a non-human animal in a cytokine storm state, as compared with the case where the cytokine storm inhibitor is not administered.

<Use>
The tissue repair agents of the present invention include diseases related to cytokine storms such as infectious diseases, drug administration, severe surgical invasion, sepsis, systemic inflammatory syndrome (SIRS), disseminated intravascular coagulation syndrome (DIC), multi-organ failure, etc. It can be used as a therapeutic or prophylactic agent for inflammation, or as a therapeutic or prophylactic agent for the aftereffects of cytokine storms. SOD3 contained in the microparticles contained in the tissue repair agent of the present invention can suppress (downwardly adjust) a plurality of cytokines involved in cytokine storms, and cooperates with IFNγ and TNFα to cause tissue damage caused by cytokine storms. Since it can be repaired, it can be used as a therapeutic or prophylactic agent for these coronavirus infections (such as COVID-19). In fact, the lungs of the elderly are low in SOD3, suggesting that this is associated with aggravation of COVID-19 (ANTIOXITANTS & REDOX SIGNALING (2020), 33, 2). It has also been suggested that cells in a cytokine storm state are under oxidative stress (Front. Bioeng. Biotechnol. (2020), 8: 554) and contain microparticles contained in the tissue repair agent of the present invention. By administering a large amount of highly active SOD3, it is possible to enhance the antioxidant effect and suppress the oxidative stress of cells in a cytokine storm state.
The tissue repair agent of the present invention can thus suppress cytokine storms, prevent or treat diseases related to cytokine storms, and increase survival rate from diseases related to cytokine storms, as well as tissues caused by cytokine storms. It is used as a remedy for the aftereffects of cytokine storms by repairing damage.

However, the tissue repair agent of the present invention may be used for purposes other than these. In either case, the tissue repair agent of the present invention is preferably a pharmaceutical composition.

The tissue repair agent of the present invention can be used as a therapeutic or prophylactic agent for viral diseases such as COVID-19 even in infectious diseases and sepsis. Here, when some coronaviruses such as SARS-CoV and SARS-CoV-2, which is the causative virus of COVID-19, infect humans and animals other than humans, a cytokine storm state occurs.
At the time of filing of this application, the tissue repair agent of the present invention can be used (may be used) as a therapeutic agent for COVID-19 even if the pharmacological test results as a therapeutic agent for COVID-19 are not shown. ).
Being COVID-19 (being a new coronavirus infection) means that the living body of a human or non-human animal has cells infected with SARS-CoV-2. Infectious diseases can be confirmed by methods such as detection or virus titration from respiratory samples or detection of blood circulation SARS-CoV-2 specific antibody. In that case, a known method using PCR is used. Be done.
Prevention of COVID-19 means blocking, or at least reducing the likelihood of its development, infection of humans or non-human animals in vivo by SARS-CoV-2.
The tissue repair agent of the present invention may be used as a therapeutic agent for COVID-19. Treatment of COVID-19 means reducing, weakening, or shortening the recovery period of viral infection-related symptoms (respiratory syndrome, fever, etc.) in humans or non-human animals. do. It is preferable that the virus infection rate (infection titer) of a human or animal living body is reduced by administration of the tissue repair agent of the present invention, and it is more preferable that the virus is completely eliminated from the living body.
Furthermore, the tissue repair agent of the present invention is used as a prophylactic or therapeutic agent for the sequelae of COVID-19. Since the tissue repair agent of the present invention can repair the tissue damage caused by the cytokine storm through suppression of the cytokine storm, a prophylactic or therapeutic agent for the sequelae of COVID-19, which is considered to be caused by the sequelae of the cytokine storm. Used as.

The tissue repair agent of the present invention is easier to mass-produce than a composition that can be used as a conventional cytokine storm inhibitor or immunosuppressant, and is a culture solution of stem cells that was conventionally discarded as industrial waste or the like. There are advantages such as being able to utilize the above, reducing the disposal cost of the stem cell culture solution, and the like. In particular, when the culture supernatant of dental pulp-derived stem cells or the like is a culture supernatant of human dental pulp-derived stem cells, human adipose-derived stem cells, human bone marrow-derived stem cells or human umbilical cord-derived stem cells, the tissue repair agent of the present invention is applied to humans. When applied, it has the advantages of high safety from the viewpoint of immunology and few ethical problems. When the culture supernatant of dental pulp-derived stem cells or the like is a culture supernatant of dental pulp-derived stem cells or the like from patients with various diseases (infertility, etc.), the tissue repair agent of the present invention may be applied to the patient. It will be safer and less ethical.
Since the tissue repair agent of the present invention is derived from the culture supernatant of dental pulp-derived stem cells and the like, it is also used for repair medical purposes. In particular, a composition containing fine particles derived from a culture supernatant such as dental pulp-derived stem cells is preferably used for restoration medical use. Here, it is known that in regenerative medicine premised on stem cell transplantation, stem cells do not play a leading role in regeneration, and the humoral components produced by stem cells repair organs together with their own stem cells. Difficult problems such as canceration, standardization, administration method, storage stability, and culture method associated with conventional stem cell transplantation have been solved, and repaired with a composition using fine particles derived from culture supernatant such as dental pulp-derived stem cells. Medical treatment becomes possible. Compared with stem cell transplantation, repair using the tissue repair agent of the present invention is safer because tumorigenesis is less likely to occur because cells are not transplanted. Further, there is an advantage that the culture supernatant of dental pulp-derived stem cells and the like and the tissue repair agent of the present invention can be used with a constant standardized quality. Since mass production and an efficient administration method can be selected, it can be used at low cost.

<Fine particles>
In the present invention, fine particles derived from a culture supernatant such as dental pulp-derived stem cells are used, and the fine particles contain extracellular superoxide dismutase (SOD3) in an effective amount or more capable of repairing a tissue or cell damaged by a cytokine storm. The fine particles are derived from the dental pulp-derived stem cells or the like by secretion, budding or dispersion from the dental pulp-derived stem cells or the like, and are exuded, released or shed from the cell culture medium. Therefore, the fine particles are contained in the culture supernatant of dental pulp-derived stem cells and the like.
The tissue remodeling agent of the present invention is used in a state where fine particles derived from dental pulp-derived stem cells, adipose-derived stem cells, bone marrow-derived stem cells, umbilical cord-derived stem cells or the culture supernatants of these immortalized stem cells are purified from the culture supernatant. .. That is, it is preferable that the fine particles are fine particles purified from the culture supernatant.
The origin of the fine particles can be determined by a known method. For example, it is possible to determine whether the fine particles are derived from dental pulp-derived stem cells, adipose-derived stem cells, bone marrow-derived stem cells, or umbilical cord-derived stem cells by the method described in J Stem Cell Res Ther (2018) 8: 2. Specifically, the origin of each microparticle can be determined based on the miRNA pattern of the microparticles.

In the present invention, the microparticles contain extracellular superoxide dismutase (SOD3). Here, SOD3 is one type of SOD. SOD is an enzyme that disproportionates superoxide anion radicals (O _2- ⁾ into oxygen (O ₂ ) and hydrogen peroxide (H ₂ O ₂ ). SOD is ubiquitous in oxygen-metabolizing cells and can protect cells from oxygen-mediated free radical damage. SOD is classified into four types according to the difference in metal cofactor and localization, and SOD3 is SOD bound to extracellular fluid or membrane.

(Characteristics of fine particles)
The microparticles are preferably at least one selected from the group consisting of exosomes, microvesicles, membrane particles, membrane vesicles, ectosomes and exovesicles, or microvesicles. , Exosomes are more preferred.
The diameter of the fine particles is preferably 10 to 1000 nm, more preferably 30 to 500 nm, and particularly preferably 50 to 150 nm.
The microparticles contain more than an effective amount of SOD3 capable of repairing tissue or cells damaged by a cytokine storm. The fine particles preferably contain SOD3 in an amount of 1.0 ng / mg or more, more preferably 3.0 ng / mg or more, particularly preferably 6.0 ng / mg or more, and 10.0 ng / mg per 1 mg of the fine particles. It is more preferable to include the above. A preferred embodiment of the tissue repair agent of the present invention is an embodiment in which the SOD3 activity is further enhanced by containing specific fine particles thus sufficiently containing SOD3 in a preferably high concentration.
It is more preferable that the fine particles have high SOD3 activity from the viewpoint of easily suppressing the cytokine storm.
Further, it is desirable that a molecule called tetraspanin such as CD9, CD63, and CD81 is present on the surface of the fine particles, which may be CD9 alone, CD63 alone, CD81 alone, or any combination of two or three of them. good.
Hereinafter, preferred embodiments of using exosomes as the fine particles may be described, but the fine particles of the present invention are not limited to exosomes.

Exosomes are preferably extracellular vesicles released from the cell upon fusion of the polytope with the plasma membrane.
The surface of the exosome preferably contains lipids and proteins derived from cell membranes such as dental pulp-derived stem cells.
It is preferable that the inside of the exosome contains intracellular substances such as dental pulp-derived stem cells such as nucleic acids (microRNA, messenger RNA, DNA, etc.) and proteins.
Exosomes are known to be used for cell-to-cell communication by transporting genetic information from one cell to another. Exosomes are easily traceable and can be targeted to specific regions.

(Content of fine particles)
The tissue repair agent of the present invention is not particularly limited in the content of fine particles. The tissue repair agent of the present invention preferably contains 0.5 × 10 ⁸ or more fine particles, more preferably 1.0 × 10 ⁸ or more, and particularly preferably 2.0 × 10 ⁸ or more. It is preferable to include 1.0 × 10 ⁹ or more, and even more preferably 2.0 × 10 ⁹ or more.
Further, the tissue repair agent of the present invention is not particularly limited in the content concentration of fine particles. The tissue repair agent of the present invention preferably contains 0.01 × 10 ⁸ particles / mL or more, more preferably 0.05 × 10 ⁸ particles / mL or more, and 0.1 × 10 ⁸ particles / mL. It is particularly preferable to contain the above, more preferably 1.0 × 10 ⁹ pieces / mL or more, and even more preferably 2.0 × 10 ⁹ pieces / mL or more. A preferred embodiment of the tissue repair agent of the present invention is an embodiment in which SOD3 activity is further enhanced by containing specific fine particles sufficiently containing SOD3 in such a high concentration.

(Culture supernatant of dental pulp-derived stem cells, etc.)
The culture supernatant of dental pulp-derived stem cells and the like is not particularly limited.
It is preferable that the culture supernatant of dental pulp-derived stem cells or the like contains substantially no serum. For example, the culture supernatant of dental pulp-derived stem cells and the like preferably has a serum content of 1% by mass or less, more preferably 0.1% by mass or less, and preferably 0.01% by mass or less. Especially preferable.

-Pulp-derived stem cells, etc.-
The dental pulp-derived stem cells, adipose-derived stem cells, bone marrow-derived stem cells, and umbilical cord-derived stem cells may be derived from humans or non-human animals. Examples of animals other than humans include animals (species) to which the tissue repair agent of the present invention to be administered is administered, which will be described later, and mammals are preferable.

The dental pulp-derived stem cells used in the culture supernatant are not particularly limited. Dropped deciduous dental pulp stem cells (stem cells from exfoliated deciduous teeth), deciduous dental pulp stem cells obtained by other methods, and permanent pulp stem cells (DPSC) can be used. In addition to human deciduous dental pulp stem cells and human permanent dental pulp stem cells, dental pulp-derived stem cells derived from non-human animals such as porcine deciduous dental pulp stem cells can be used.
In addition to exosomes, dental spinal cord-derived stem cells (as well as adipose-derived stem cells, bone marrow-derived stem cells, and umbilical cord-derived stem cells described below) include vascular endothelial growth factor (VEGF), hepatocyte growth factor (HGF), and insulin-like growth factor (IGF). Can produce various cytokines such as platelet-derived growth factor (PDGF), transformed growth factor-beta (TGF-β) -1 and -3, TGF-α, KGF, HBEGF, SPARC, other growth factors, chemokine, etc. .. It can also produce many other bioactive substances.
In the present invention, it is particularly preferable that the dental pulp-derived stem cells used in the culture supernatant of dental pulp-derived stem cells are dental pulp-derived stem cells containing a large amount of protein, and it is preferable to use deciduous dental pulp stem cells. That is, in the present invention, it is preferable to use the culture supernatant of deciduous dental pulp stem cells.

The adipose-derived stem cells used in the culture supernatant are not particularly limited. As the adipose-derived stem cells, somatic stem cells contained in any adipose tissue can be used. In addition to human adipose-derived stem cells, adipose-derived stem cells derived from non-human animals such as porcine adipose stem cells can be used. As the adipose-derived stem cells, for example, adipose-derived stem cells prepared by the methods described in [0023] to [0041] of International Publication WO2018 / 038180 can be used, and the contents of this publication are referred to herein. Will be incorporated into. Further, adipose-derived stem cells prepared by the methods described in [0022] and [0172] to [0187] of JP-A-2018-531979 can be used, and the contents of this publication are referred to in the present specification. Be incorporated.

The bone marrow-derived stem cells used in the culture supernatant are not particularly limited. In addition to human bone marrow-derived stem cells, bone marrow-derived stem cells derived from non-human animals such as porcine bone marrow stem cells can be used. As the bone marrow-derived stem cells, for example, bone marrow-derived stem cells prepared by the methods described in [0027] to [0028] and [0048] of JP-A-2017-132744 can be used, and the contents of this publication can be referred to. And incorporated herein.

The umbilical cord-derived stem cells used in the culture supernatant are not particularly limited. In addition to human umbilical cord-derived stem cells, umbilical cord-derived stem cells derived from non-human animals such as porcine umbilical cord stem cells can be used. As the umbilical cord-derived stem cells, for example, umbilical cord-derived stem cells prepared by the methods described in [0023] to [0033] of JP-A-2017-119646 can be used, and the contents of this publication can be referred to in the present specification. Incorporated into the book.

The dental pulp-derived stem cells and the like used in the present invention may be natural or genetically modified as long as the desired treatment can be achieved.
In particular, in the present invention, immortalized stem cells of dental pulp-derived stem cells, adipose-derived stem cells, bone marrow-derived stem cells, and umbilical cord-derived stem cells can be used. By using immortalized stem cells capable of substantially infinite proliferation, the amount and composition of biological factors contained in the culture supernatant of stem cells can be stabilized for a long period of time. The immortalized stem cells of dental pulp-derived stem cells, adipose-derived stem cells, bone marrow-derived stem cells, and umbilical cord-derived stem cells are not particularly limited. The immortalized stem cells are preferably immortalized stem cells that have not become cancerous. The immortalized stem cells of dental pulp-derived stem cells, adipose-derived stem cells, bone marrow-derived stem cells, and umbilical cord-derived stem cells include the following low-molecular-weight compounds (inhibitors) alone or in the dental pulp-derived stem cells, adipose-derived stem cells, bone marrow-derived stem cells, and umbilical cord-derived stem cells. It can be prepared by adding in combination and culturing.
The TGFβ receptor inhibitor is not particularly limited as long as it has an action of inhibiting the function of the transforming growth factor (TGF) β receptor, and is, for example, 2- (5-benzo [1,3]. ] Dioxol-4-yl-2-tert-butyl-1H-imidazole-4-yl) -6-methylpyrididine, 3- (6-methylpyridin-2-yl) -4- (4-quinolyl) -1- Phenylthiocarbamoyl-1H-pyrazole (A-83-01), 2- (5-chloro-2-fluorophenyl) pteridine-4-yl) Pyridine-4-ylamine (SD-208), 3- (Pyridine-2) -Il) -4- (4-quinonyl)] -1H-pyrazole, 2- (3- (6-methylpyridin-2-yl) -1H-pyrazole-4-yl) -1,5-naphthylidine (above, Merck), SB431542 (Sigma Aldrich) and the like. A-83-01 is preferable.
The ROCK inhibitor is not particularly limited as long as it has an action of inhibiting the function of Rho-binding kinase. Examples of the ROCK inhibitor include GSK269962A (Axonmedchem), Hydrochloride (Tocris Bioscience), Y-27632, H-1152 (hereinafter, Fujifilm Wako Pure Chemical Industries, Ltd.) and the like. Y-27632 is preferable.
The GSK3 inhibitor is not particularly limited as long as it inhibits GSK-3 (Glycogen kinase kinase 3, glycogen synthase 3), such as A 1070722, BIO, BIO-acetone oxime (hereinafter, TOCRIS) and the like. Can be mentioned.
The MEK inhibitor is not particularly limited as long as it has an action of inhibiting the function of MEK (MAP kinase-ERK kinase), and is, for example, AZD6244, CI-1040 (PD184352), PD0325901, RDEA119 (BAY86). -9766), SL327, U0126-EtOH (above, Selleck), PD98059, U0124, U0125 (above, Cosmo Bio Co., Ltd.) and the like.

It is preferable that the dental pulp-derived stem cells and the like used in the present invention are genetically modified so as to highly express SOD3 from the viewpoint of enhancing the effect of the tissue repair agent of the present invention. The gene modification technique for highly expressing SOD is not particularly limited, and a known method can be used. For example, Mol Genet Genomic Med. (2019) 7: The method described in e831 can be used.

When the tissue repair agent of the present invention is used for regenerative medicine, due to the request of the method for ensuring safety such as regenerative medicine, dental pulp-derived stem cells, adipose-derived stem cells, bone marrow-derived stem cells, umbilical cord-derived stem cells or immortalized stem cells thereof (dental pulp-derived stem cells, etc.) ) The composition containing microparticles derived from the culture supernatant shall not contain other somatic stem cells other than dentin-derived stem cells and the like. The tissue repair agent of the present invention may contain mesenchymal stem cells other than dental pulp-derived stem cells and other somatic stem cells, but is preferably not contained.
Examples of other somatic stem cells other than mesenchymal stem cells include, but are not limited to, stem cells derived from the dermis system, digestive system, bone marrow system, nervous system and the like. Examples of somatic stem cells of the dermis system include epithelial stem cells, hair follicle stem cells and the like. Examples of somatic stem cells of the digestive system include pancreatic (general) stem cells, hepatic stem cells and the like. Examples of myeloid somatic stem cells (other than mesenchymal stem cells) include hematopoietic stem cells and the like. Examples of somatic stem cells of the nervous system include neural stem cells, retinal stem cells and the like.
The tissue repair agent of the present invention may contain stem cells other than somatic stem cells, but is preferably not contained. Examples of stem cells other than somatic stem cells include embryonic stem cells (ES cells), induced pluripotent stem cells (iPS cells), and embryonic carcinoma cells (EC cells).
The method for preparing a culture supernatant of dental pulp-derived stem cells, adipose-derived stem cells, bone marrow-derived stem cells, umbilical cord-derived stem cells, or immortalized stem cells thereof is not particularly limited, and conventional methods can be used.
The culture supernatant of dental pulp-derived stem cells and the like is a culture solution obtained by culturing dental pulp-derived stem cells and the like, and does not contain the cells themselves. For example, by separating and removing cell components after culturing dental pulp-derived stem cells or the like, a culture supernatant that can be used in the present invention can be obtained. Culture supernatants that have been appropriately subjected to various treatments (for example, centrifugation, concentration, solvent replacement, dialysis, freezing, drying, freeze-drying, dilution, desalting, storage, etc.) may be used.

Dental pulp-derived stem cells and the like for obtaining a culture supernatant of dental pulp-derived stem cells and the like can be selected by a conventional method, based on the size and morphology of the cells, or as adhesive cells. In the case of dental pulp-derived stem cells, dental pulp cells collected from shed deciduous teeth or permanent teeth can be selected as adhesive cells or passage cells thereof. In the case of adipose-derived stem cells, adipocytes collected from adipose tissue can be selected as adherent cells or passage cells thereof. In the case of umbilical cord-derived stem cells, cells collected from the umbilical cord can be selected as adhesive cells or passage cells thereof. As a culture supernatant of dental pulp-derived stem cells or the like, a culture supernatant obtained by culturing selected stem cells can be used.

The "culture supernatant of dental pulp-derived stem cells and the like" is preferably a culture solution containing no cells themselves obtained by culturing dental pulp-derived stem cells and the like. In one embodiment, the culture supernatant of dental pulp-derived stem cells or the like used in the present invention preferably does not contain cells (regardless of cell type) as a whole. By this feature, the composition of this embodiment is clearly distinguished from various compositions containing dental pulp-derived stem cells and the like as well as dental pulp-derived stem cells and the like themselves. A typical example of this embodiment is a composition that does not contain dental pulp-derived stem cells or the like and is composed only of a culture supernatant of dental pulp-derived stem cells or the like.
The culture supernatant of dental pulp-derived stem cells used in the present invention may contain culture supernatants of both deciduous dental pulp-derived stem cells and adult dental pulp-derived stem cells. The culture supernatant of dental pulp-derived stem cells used in the present invention preferably contains the culture supernatant of deciduous dental pulp-derived stem cells as an active ingredient, more preferably 50% by mass or more, and preferably 90% by mass or more. It is more preferable that the culture supernatant of dental pulp-derived stem cells used in the present invention is a composition composed only of the culture supernatant of deciduous dental pulp-derived stem cells.

As a culture medium such as dental pulp-derived stem cells for obtaining a culture supernatant, a basal medium or a basal medium supplemented with serum or the like can be used. In addition to Dulbecco's modified Eagle's medium (DMEM), Iskov's modified Dulbecco's medium (IMDM) (GIBCO, etc.), Ham F12 medium (HamF12) (SIGMA, GIBCO, etc.), RPMI1640 medium, etc. should be used as the basic medium. Can be done. Examples of components that can be added to the medium include serum (fetal bovine serum, human serum, sheep serum, etc.), serum substitutes (Knockout serum replenishment (KSR), etc.), bovine serum albumin (BSA), antibiotics, and various types. Examples include vitamins and various minerals.
However, in order to prepare a “culture supernatant of dental pulp-derived stem cells, etc.” that does not contain serum, it is advisable to use a serum-free medium throughout the entire process or for several subcultures from the end or the end. For example, by culturing dental pulp-derived stem cells or the like in a serum-free medium (serum-free medium), a culture supernatant of dental pulp-derived stem cells or the like that does not contain serum can be prepared. By performing one or multiple subcultures and culturing the last or several subcultures in a serum-free medium, a culture supernatant of dental pulp-derived stem cells or the like that does not contain serum can be obtained. Can be done. On the other hand, a culture supernatant of dental pulp-derived stem cells or the like that does not contain serum can also be obtained by removing serum from the collected culture supernatant by using dialysis, solvent substitution with a column, or the like.

The conditions usually used can be applied as they are to the culture of dental pulp-derived stem cells and the like for obtaining a culture supernatant. The method for preparing the culture supernatant of dental pulp-derived stem cells or the like may be the same as the cell culture method described later, except that the steps for isolating and selecting stem cells are appropriately adjusted according to the type of stem cells. Those skilled in the art can appropriately isolate and select dental pulp-derived stem cells and the like according to the type of dental pulp-derived stem cells and the like.
In addition, special conditions may be applied to the culture of dental pulp-derived stem cells and the like in order to produce a large amount of specific exosomes that contribute to SOD3 expression and / or SOD3 activity. Special conditions include, for example, low temperature conditions, low oxygen conditions, microgravity conditions, and other conditions for co-culturing with some stimulant.

-Other components contained in the culture supernatant of dental pulp-derived stem cells, etc.-
The culture supernatant of dental pulp-derived stem cells or the like used for preparing exosomes in the present invention may contain other components in addition to the culture supernatant of dental pulp-derived stem cells or the like, but does not substantially contain other components. Is preferable.
However, each type of additive used for the preparation of exosomes may be added to the culture supernatant of dental pulp-derived stem cells or the like and then stored.

(Purification of fine particles)
Fine particles can be purified from the culture supernatant of dental pulp-derived stem cells and the like.
The purification of fine particles is preferably the separation of fractions containing fine particles from the culture supernatant of dental pulp-derived stem cells and the like, and more preferably the isolation of fine particles.
The microparticles can be isolated by being separated from the non-associative components based on the properties of the microparticles. For example, microparticles can be isolated based on molecular weight, size, morphology, composition or biological activity.
In the present invention, fine particles can be purified by separating a specific fraction (for example, a precipitate) containing a large amount of fine particles obtained by centrifuging the culture supernatant of dental pulp-derived stem cells or the like. .. Unnecessary components (insoluble components) of fractions other than the predetermined fraction may be removed. Removal of solvents, dispersion media, and unwanted components from the tissue repair agents of the present invention does not have to be complete removal. An example of the conditions for centrifugation is 100 to 20000 g for 1 to 30 minutes.
In the present invention, fine particles can be purified by filtering a culture supernatant of dental pulp-derived stem cells or the like or a centrifuge thereof. Unnecessary components can be removed by filtration treatment. Further, if a filtration membrane having an appropriate pore size is used, unnecessary components can be removed and sterilization can be performed at the same time. The material and pore size of the filtration membrane used for the filtration treatment are not particularly limited. Filtration can be performed by a known method with a filtration membrane having an appropriate molecular weight or size cutoff. The pore size of the filtration membrane is preferably 10 to 1000 nm, more preferably 30 to 500 nm, and particularly preferably 50 to 150 nm from the viewpoint of easy separation of exosomes.
In the present invention, a culture supernatant of dental pulp-derived stem cells or the like, a centrifugally treated product thereof, or a filtered product thereof can be separated by using a further separation means such as lamb chromatography. For example, high performance liquid chromatography (HPLC) using various columns can be used. The column can be a size exclusion column or a join column.
One or more properties or biological activity of the microparticles can be used to track the microparticles (or their activity) in each fraction at each treatment step. For example, light scattering, refractive index, dynamic light scattering or UV-visible light detectors can be used to track microparticles. Alternatively, ACE2 expression levels, ACE2 activity, and the like can be used to track activity in each fraction.
As a method for purifying fine particles, the methods described in [0034] to [0064] of JP-A-2019-524824 may be used, and the contents of this publication are incorporated herein by reference.

<Other ingredients>
The tissue repair agent of the present invention may contain other components in addition to the fine particles, depending on the type and purpose of the animal to be administered, as long as the effects of the present invention are not impaired. Other ingredients include nutritional ingredients, antibiotics, cytokines, protective agents, carriers, excipients, disintegrants, buffers, emulsifiers, suspensions, soothing agents, stabilizers, preservatives, preservatives and the like. Be done.
Examples of the nutritional component include fatty acids and vitamins.
Examples of the antibiotic include penicillin, streptomycin, gentamicin and the like.
Examples of the carrier include materials known as pharmaceutically acceptable carriers.
The tissue repair agent of the present invention may be the fine particles themselves, or may be a pharmaceutical composition further containing a pharmaceutically acceptable carrier, excipient, or the like. The purpose of the pharmaceutical composition is to facilitate the administration of microparticles to the recipient.

The pharmaceutically acceptable carrier is preferably a carrier (including a diluent) that does not cause significant irritation to the subject and does not suppress the biological activity and properties of the compound being administered. Examples of carriers are propylene glycol; (saline) saline; emulsions; buffers; media such as DMEM or RPMI; cryopreservation media containing components that remove free radicals.

The tissue repair agent of the present invention may contain an active ingredient of a conventionally known cytokine storm inhibitor and / or immunosuppressant. For example, it is preferable that the tissue repair agent of the present invention contains an active ingredient having a mechanism different from that of the present invention, such as an anti-IL-6 antibody and a steroid, from the viewpoint of enhancing, coexisting and / or complementing the effect. The tissue repair agent of the present invention more preferably contains at least one of an anti-IL-6 antibody and a steroid, and particularly preferably contains an anti-IL-6 antibody. When the tissue repair agent of the present invention contains an active ingredient having a mechanism different from that of the present invention, such as an anti-IL-6 antibody or a steroid, the content or concentration of such an active ingredient may be the same as that of a known method. You may. Those skilled in the art can appropriately change these according to the intended use, administration target, and the like.

On the other hand, the tissue repair agent of the present invention preferably does not contain a predetermined substance.
For example, the tissue repair agent of the present invention preferably does not contain dental pulp-derived stem cells or the like.
Moreover, it is preferable that the tissue repair agent of the present invention does not contain MCP-1. However, it may contain cytokines other than MCP-1. Examples of other cytokines include those described in [0014] to [0020] of JP-A-2018-023343.
Moreover, it is preferable that the tissue repair agent of the present invention does not contain Siglec 9. However, it may contain other sialic acid-binding immunoglobulin-like lectins other than Siglec 9.
It is preferable that the tissue repair agent of the present invention does not substantially contain serum (fetal bovine serum, human serum, sheep serum, etc.). Further, it is preferable that the tissue repair agent of the present invention is substantially free of conventional serum substitutes such as Knockout serum replenishment (KSR).
The tissue repair agent of the present invention preferably has a content (solid content) of the above-mentioned other components of 1% by mass or less, more preferably 0.1% by mass or less, and 0.01% by mass. % Or less is particularly preferable.

<Manufacturing method of tissue repair agent>
The method for producing the tissue repair agent of the present invention is not particularly limited.
A culture supernatant of dental pulp-derived stem cells or the like may be prepared by the above method, and then fine particles may be purified from the culture supernatant of dental pulp-derived stem cells or the like to prepare a tissue repair agent of the present invention. Alternatively, the tissue repair agent of the present invention may be prepared by purifying fine particles from a culture supernatant of dental pulp-derived stem cells or the like obtained by commercial purchase. Furthermore, the composition containing the culture supernatant of the discarded dental pulp-derived stem cells and the like is transferred (or the composition is appropriately purified), and fine particles are purified from the composition to purify the tissue repair agent of the present invention. May be prepared.

The final form of the tissue repair agent of the present invention is not particularly limited. For example, the tissue repair agent of the present invention is a form in which fine particles are filled in a container together with a solvent or a dispersion medium; a form in which fine particles are gelled with a gel and filled in a container; the fine particles are frozen and / or dried. Examples thereof include a form in which the particles are solidified and then formulated or filled in a container. Examples of the container include a tube suitable for cryopreservation, a centrifuge tube, a bag and the like. The freezing temperature can be, for example, −20 ° C. to -196 ° C.

[How to use tissue repair agent]
The method of using the tissue repair agent of the present invention is to administer the tissue repair agent to a human or non-human animal to reduce the amount of cytokine in the cells or blood of the human or non-human animal, and to use a cytokine storm. Repairs tissue damaged by cytokine storms through suppression of.

The step of administering the tissue repair agent of the present invention to a human or a non-human animal is not particularly limited.
Examples of the administration method include spraying or aspiration to the oral cavity, nasal cavity or respiratory tract, infusion, local administration, nasal drops and the like, and it is preferable that there is little invasion. Injection is preferable as a method of local administration. In addition, electroporation is also preferable, in which a voltage (electric pulse) is applied to the skin surface to temporarily make fine holes in the cell membrane so that the active ingredient can penetrate into the dermis layer, which cannot be reached by ordinary care. In the case of local administration, intravenous administration, intraarterial administration, intramural administration, intradermal administration, subcutaneous administration, intramuscular administration, intraperitoneal administration, etc. can be mentioned, and it may be intraarterial administration or intravenous administration. More preferably, intravenous administration is more preferable.
The tissue remodeling agent of the present invention is not limited to application to lung tissue, but can be applied to systemic tissues (all organs, blood vessels, etc.). Therefore, as the administration method, intraarterial administration or intravenous administration is more preferable than spraying or aspiration to the oral cavity, nasal cavity or respiratory tract from the viewpoint of easy application to systemic tissues, and intravenous administration is particularly preferable. preferable. The tissue repair agent of the present invention administered to an animal may circulate in the animal body and reach a predetermined tissue.
The number of administrations and the administration interval are not particularly limited. The number of administrations can be 1 to 2 or more, preferably 1 to 5 times, more preferably 1 or 2 times, and particularly preferably 2 times. The dosing interval is preferably 1 to 24 hours, more preferably 12 hours or less. However, it can be appropriately adjusted according to the symptom of the administration target.
The dose is not particularly limited as the microparticles contain extracellular superoxide dismutase (SOD3) in an effective amount or more capable of repairing tissues or cells damaged by a cytokine storm. In the mouse model, it is preferably 1 to 50 μg, more preferably 3 to 25 μg, and even more preferably 5 to 15 μg per mouse (about 25 g). When administered to other animals, it is preferably 0.04 to 2 mg / kg (weight / body weight), more preferably 0.1 to 1 mg / kg, and 0.2 to 0.6 mg / kg. It is particularly preferable to have. However, it can be appropriately adjusted according to the symptom of the administration target.

The target animal (species) to which the tissue repair agent of the present invention is administered is not particularly limited. The target animal to which the tissue repair agent of the present invention is administered is preferably mammals, birds (chicken, quail, duck, etc.), and fish (salmon, trout, tuna, bonito, etc.). The mammal may be a human or a non-human mammal, but humans are particularly preferred. The non-human mammals are more preferably cows, pigs, horses, goats, sheep, monkeys, dogs, cats, mice, rats, guinea pigs and hamsters.

The tissue repair agent of the present invention may be used in combination with a conventionally known cytokine storm inhibitor and / or immunosuppressant. For example, it is preferable to use the tissue repair agent of the present invention in combination with an agent having a mechanism different from that of the present invention, such as an anti-IL-6 antibody or a steroid, from the viewpoint of enhancing, coexisting and / or complementing the effect. In the method of using the tissue repair agent of the present invention, it is more preferable to use the tissue repair agent of the present invention in combination with at least one of an anti-IL-6 antibody and a steroid, and it is particularly preferable to use the tissue repair agent in combination with an anti-IL-6 antibody. .. When the tissue repair agent of the present invention is used in combination with a drug having a mechanism different from that of the present invention, such as an anti-IL-6 antibody or a steroid, the dose, frequency, and timing of administration of such a drug shall be the same as known methods. It may be the same or different. In addition, when the tissue repair agent of the present invention is used in combination with a drug having a different mechanism from the present invention, such as an anti-IL-6 antibody or a steroid, the frequency and timing of administration of both may be the same or different. Those skilled in the art can appropriately change these according to the intended use, administration target, and the like.
The mechanism of anti-IL-6 antibody is to inhibit the function of IL-6 produced by marginal B cells, which is a factor that exacerbates sepsis (cytokine storm) (Nature communications (2016) 7). : 11498). In this paper, 1 hour after LPS administration, typical inflammatory cytokines IL-6 and TNFα are produced in large amounts from macrophages and only slightly from marginal B cells, but 4 after LPS administration. Marginal B cells have been shown to produce more IL-6 than macrophages after hours.
In addition, the mechanism of steroids is to bind to cytoplasmic glucocorticoid (GR) to form active GR, regulate gene expression in nuclear DNA and transcriptional regulators, and cytokine synthesis (IL-1, IL-2). , IL-5, IL-6, IL-8, IFNγ) and the like are known to exert anti-inflammatory and immunosuppressive effects.

[Screening method]
The screening method of the present invention is a screening method for factors or combinations thereof that are effective for tissue repair to repair tissues damaged by cytokine storm through inhibition of cytokine storm, and is a screening method for dental pulp-derived stem cells, adipose-derived stem cells, bone marrow-derived stem cells, and umbilical cord. One or more components contained in the derived stem cells or the culture supernatant obtained by culturing these immortalized stem cells are supplied to an evaluation system for extracellular superoxide dismutase (SOD3) to evaluate the characteristics related to SOD3. Have a process.

According to the screening method of the present invention, which of the components contained in the culture supernatant of dental pulp-derived stem cells and the like is effective for tissue repair to repair the tissue damaged by the cytokine storm through suppression of the cytokine storm. Can be screened by feeding the evaluation system for SOD3 and evaluating the characteristics related to SOD3. In the screening method of the present invention, as a result of evaluating the characteristics of the component with respect to SOD3, for example, it is preferable to identify and obtain a component having a SOD3 protein amount of preferably 1.0 ng / mg or more after purification. Further, for example, it is preferable to identify and obtain a component having a SOD3 activity of preferably 0.3 unit / μg or more after purification.
Further, according to the screening method of the present invention, it is possible to obtain a tissue repair agent or a preventive or therapeutic composition containing the component specified by the screening as an active ingredient. The tissue repair agent or preventive or therapeutic composition obtained by screening is not derived from the culture supernatant of dental pulp-derived stem cells, etc., and is effective for tissue repair by combining commercially available and / or purified specific components. Agents or prophylactic or therapeutic compositions can be obtained. That is, the present invention is a tissue repair agent containing a component obtained by evaluating the characteristics related to SOD3 by the screening method of the present invention, and the component is a tooth pulp-derived stem cell, an adipose-derived stem cell, a bone marrow-derived stem cell, or a umbilical cord-derived stem cell. Alternatively, derived from the culture supernatant of these immortalized stem cells, the component contains extracellular superoxide dysmutase (SOD3) in an effective amount or more capable of repairing a tissue or cell damaged by a cytokine storm, and the component contains 1 mg of SOD3. Also as a tissue repair agent that contains 1.0 ng / mg or more per ng / mg and satisfies at least one of SOD3 activity of 0.3 unit / μg and repairs tissues damaged by the cytokine storm through suppression of the cytokine storm. Related.
A more preferable range of the amount of SOD3 protein and SOD activity of the component is a tissue repair agent using fine particles derived from dental pulp-derived stem cells, adipose-derived stem cells, bone marrow-derived stem cells, umbilical cord-derived stem cells, or culture supernatants of these immortalized stem cells. It is the same as the more preferable range of the amount of SOD3 protein and the SOD activity in the case of.

As the evaluation system for SOD3 used in the screening method of the present invention, a known evaluation system can be used. For example, the method for quantifying SOD3 and the method for measuring SOD3 activity described in the present specification can be applied to model mice for various types of cytokine storm-related diseases, and an evaluation system using related cells can be appropriately selected and used. .. Those skilled in the art can appropriately select each of these types of evaluation systems, and examples of the present specification can also be referred to.

As described above, as the component obtained by evaluating the characteristics related to SOD3 by the screening method of the present invention, microparticles (preferably exosomes) derived from the culture supernatant of dental pulp-derived stem cells and the like can be mentioned.
In the screening method of the present invention, the characteristics related to SOD3 of other components derived from the culture supernatant of dental pulp-derived stem cells and the like can be evaluated and obtained. As described above, culture supernatants of dental pulp-derived stem cells, adipose-derived stem cells, bone marrow-derived stem cells, umbilical cord-derived stem cells or immortalized stem cells thereof are obtained in addition to microparticles such as exosomes, VEGF, HGF, IGF, PDGF), TGF-. It contains β-1, -3, TGF-α, KGF, HBEGF, SPARC, other growth factors, various cytokines such as chemokine, and many other physiologically active substances.

Hereinafter, the features of the present invention will be described in more detail with reference to Examples and Comparative Examples or Reference Examples. The materials, amounts used, ratios, treatment contents, treatment procedures, etc. shown in the following examples can be appropriately changed as long as they do not deviate from the gist of the present invention. Therefore, the scope of the present invention should not be construed as limiting by the specific examples shown below.

[Example 1]
<Preparation of culture supernatant of dental pulp-derived stem cells>
DMEM medium was used instead of DMEM / HamF12 mixed medium, and the culture supernatant of human deciduous dental pulp stem cells was prepared according to the method described in Example 6 of Japanese Patent No. 6296622. In the primary culture, fetal bovine serum (FBS) is added and cultured, and in the subculture, the supernatant of the subculture solution cultured using the primary culture solution is separated so as not to contain FBS, and the deciduous dental pulp stem cells are separated. The culture supernatant of was prepared. DMEM is Dulbecco's modified Eagle's medium, and F12 is Ham F12 medium.

<Preparation of exosomes from culture supernatant of dental pulp-derived stem cells>
From the obtained culture supernatant of deciduous dental pulp stem cells, exosomes of dental pulp-derived stem cells were purified by the following method.
The culture supernatant (100 mL) of deciduous dental pulp stem cells was filtered through a 0.22 micrometer pore-sized filter, and the solution was centrifuged at 100,000 × g at 4 ° C. for 60 minutes. The supernatant was decanted and the exosome concentrated pellet was resuspended in phosphate buffered saline (PBS). The resuspended sample was centrifuged at 100,000 xg for 60 minutes. The pellet was again collected from the bottom of the centrifuge tube as a concentrated sample (approximately 100 μl). Protein concentration was determined by the Micro BSA Protein Assay Kit (Pierce, Rockford, IL). The composition containing exosomes (concentrated solution) was stored at −80 ° C.
The composition containing the obtained exosomes (pulp-derived stem cells EVs) was used as the tissue repair agent of Example 1.

[Example 2] Preparation of adipose-derived stem cells EVs (exosomes) A culture supernatant of adipose-derived stem cells was prepared in the same manner as in Example 1 except that adipose-derived stem cells were used. From the obtained culture supernatant of adipose-derived stem cells, a composition containing exosomes was prepared in the same manner as in Example 1. The obtained composition containing exosomes (adipose-derived stem cell EVs) was used as the tissue repair agent of Example 2.

[Example 3] Preparation of bone marrow-derived stem cells EVs (exosomes) A culture supernatant of bone marrow-derived stem cells was prepared in the same manner as in Example 1 except that bone marrow-derived stem cells were used. From the obtained culture supernatant of bone marrow-derived stem cells, a composition containing exosomes was prepared in the same manner as in Example 1. The obtained exosome (composition containing bone marrow-derived stem cell EVs was used as the tissue repair agent of Example 3.

[Example 4] Preparation of umbilical cord-derived stem cells EVs (exosomes) Culture supernatants of umbilical cord-derived stem cells were prepared in the same manner as in Example 1 except that umbilical cord-derived stem cells were used. From the obtained culture supernatant of umbilical cord-derived stem cells, a composition containing exosomes was prepared in the same manner as in Example 1. The obtained exosome (composition containing umbilical cord-derived stem cell EVs) was used as the tissue repair agent of Example 4.

[evaluation]
<Characteristics of exosomes>
The average particle size of the fine particles contained in the tissue repair agent of each example was 50 to 150 nm.
The tissue repair agent of each example is a high-concentration exosome solution of 1.0 × 10 ⁹ pieces / ml or more, and the tissue repair agent of Example 1 is a high-concentration exosome solution of 2.0 × 10 ⁹ pieces / ml. there were.
In addition, the components of the obtained tissue repair agent of each example were analyzed by a known method. As a result, it was found that the tissue repair agent of each example did not contain stem cells such as dental pulp-derived stem cells, did not contain MCP-1, and did not contain Siglec 9. Therefore, it was found that the active ingredients of MCP-1 and Siglec 9, which are the active ingredients of the culture supernatant of mesenchymal stem cells, and the active ingredients different from their analogs are the active ingredients of the tissue repair agent of each example.

<Quantitative determination of SOD3>
Using SOD3 (Human) ELISA Kit (A-Frontier Co., manufactured by Ltd. (LSR), product number LFEK0107), bone marrow-derived stem cell EVs (tissue repair agent of Example 1) and adipose-derived stem cell EVs (Example 2). Tissue repair agent), umbilical cord-derived stem cell EVs (tissue repair agent of Example 3), bone marrow-derived stem cell EVs (tissue repair agent of Example 4), and the amount of protein of SOD3 in the DMEM medium used as a control by the ELISA sandwich method. Measured (N = 2). The obtained results are shown in FIG.

From FIG. 1, it was found that the exosomes contained in the tissue repair agents of each example contained a large amount of SOD3. In particular, dental pulp-derived stem cell EVs (Example 1) have a higher amount of SOD3 protein than adipose-derived stem cell EVs (Example 2) bone marrow-derived stem cell EVs (Example 3) or umbilical cord-derived stem cell EVs (Example 4). I understand. From these results, it was found that the tissue repair agent of the present invention can regulate the expression of cytokines because it contains a high concentration of SOD3. In addition, the larger the amount of protein in SOD3, the easier it is to regulate the expression of cytokines, and the easier it is to reduce the amount of cytokines of each type in the cytokine storm state.

<Measurement of SOD3 activity>
Pulp-derived stem cells EVs (tissue repair agent of Example 1), adipose-derived stem cells EVs (tissue repair agent of Example 1), adipose-derived stem cells E The SOD3 (Human) activity of (tissue repair agent of Example 3) and bone marrow-derived stem cell EVs (tissue repair agent of Example 4) was measured.
At the time of measurement, the exosome concentration and the amount of the tissue repair agent used in each example were the same, and the amount of exosome was the same. The obtained results are shown in Table 1 below.

From Table 1 above, it was found that the tissue repair agents of each example had high SOD3 activity. In particular, dental pulp-derived stem cell EVs (Example 1) were found to have higher SOD3 activity than adipose-derived stem cell EVs (Example 2) bone marrow-derived stem cell EVs (Example 3) or umbilical cord-derived stem cell EVs (Example 4). rice field. Confirmation of SOD3 activity is more accurate as a method of confirming the ease of adjusting the amount of cytokines than confirmation of the amount of SOD3 protein. The higher the SOD3 activity, the easier it is to regulate the expression of cytokines and the easier it is to reduce the amount of cytokines in each type of cytokine storm state.

<Confirmation of cytokine storm suppression in vitro>
Cytokine storms were induced using human peripheral blood mononuclear cells (PBMC), and the cytokine storm inhibitory effect of each example tissue repair agent containing exosomes was confirmed in vitro by the following method. did.
Human PMBC was cultured and stimulated with concanavalin A (Con-A, manufactured by Wako Pure Chemical Industries, Ltd.), which is a cytokine storm inducer, to induce a cytokine storm.
This system is treated by adding one of the tissue repair agent and the control saline solution of each example, and the quantification of cytokines contained in the culture supernatant of human PMBC is measured by the cytokine measurement ELISA kit (manufactured by R & D Systems). , Product name Cytokine ELISA kit). Quantified cytokines are IL-2, IL-4, IL-6, IL-10, IL-17, IFNγ and TNFα.
The addition of the tissue repair agents of Examples 1 to 3 containing exosomes was treated to 100 parts per cell of PMBC. The amount of cytokines was measured 48 hours after treatment with the tissue repair agent of each example containing exosomes (N = 6).
The obtained results are shown in Table 2 below.

From Table 2 above, the tissue repair agent of each example is administered to cells in which a cytokine storm is induced and the amount of each cytokine is increased, so that the cytokine is compared with the control to which physiological saline is administered. It was found that the amount could be significantly suppressed. In particular, it was found that dental pulp-derived stem cell EVs (Example 1) can significantly suppress the amount of cytokines as compared with adipose-derived stem cell EVs (Example 2) and bone marrow-derived stem cell EVs (Example 3).
Although the umbilical cord-derived stem cell EVs of Example 4 were not used, they have SOD3 protein amount and SOD3 activity between the fat-derived stem cell EVS of Example 2 and the bone marrow-derived stem cell EVs of Example 3, so that they are Examples. It is presumed that the amount of cytokines, which tends to be between 2 and 3, can be adjusted.

<Confirmation of cytokine storm suppression in vivo>
Cytokine storms were induced in a mouse model, and the cytokine storm inhibitory effect of the tissue repair agents of each example containing exosomes was confirmed in vivo by the following method.
Six 8-week-old mice of the C57BL / 6J strain were used per group.
Each mouse was administered 20 mg / kg body weight of lipopolysaccharide (LPS), which is a cytokine storm inducer, into the abdominal cavity of the mice.
Immediately after administration of lipopolysaccharide, one of the tissue repair agent (purified by ultracentrifugation) of each example and the control saline solution were administered from the tail vein of each mouse in the same amount of 10 μg.
After 24 hours, a total blood sample was collected and the serum in the cytokine storm of mice was collected. The quantification of cytokines contained in serum in mouse cytokine storms was performed with Immune Monitoring 48-Plex Mouse ProjectaPlex® Panel (manufactured by Invitrogen). At the same time, all blood was collected from normal mice before administration of lipopolysaccharide, and the cytokines contained in the serum were quantified in the same manner. Quantified cytokines are IL-2, IL-4, IL-6, IL-10, IL-17, IFNγ and TNFα.
The obtained results are shown in Table 3 below.

From Table 3 above, the tissue repair agent of each example was administered to an animal (mouse) in which a cytokine storm was induced and the amount of each cytokine was increased, as compared with the control to which physiological saline was administered. It was found that the amount of cytokines can be significantly suppressed. In particular, it was found that dental pulp-derived stem cell EVs (Example 1) can significantly suppress the amount of cytokines as compared with adipose-derived stem cell EVs (Example 2) and bone marrow-derived stem cell EVs (Example 3).
Although the umbilical cord-derived stem cell EVs of Example 4 were not used, they have SOD3 protein amount and SOD3 activity between the fat-derived stem cell EVS of Example 2 and the bone marrow-derived stem cell EVs of Example 3, so that they are Examples. It is presumed that the amount of cytokines, which tends to be between 2 and 3, can be adjusted.

<Evaluation of survival rate of mouse model of fatal disorder by LPS administration (1)>
(1) Confirmation of the effect of single administration The cytokine storm was induced in a mouse model, and the effect of improving the survival rate by the tissue repair agent of each example containing exosomes was confirmed in vivo by the following method.
Slc: ICR strain mice were used 10 per group.
Each mouse was administered 30 mg / kg body weight of lipopolysaccharide (LPS), which is a cytokine storm inducer, into the abdominal cavity of the mice. This condition is a harsh condition in which all mice die within 96 hours.
Six hours after LPS administration, one of the tissue repair agent (purified by ultracentrifugation) of each example and the control saline solution was administered from the tail vein of each mouse in the same amount of 10 μg per mouse. did.
The survival rate of the mice in each group was confirmed every 12 hours from 12 hours after LPS administration. The obtained results are shown in FIG.
From FIG. 2, when the tissue repair agent of each example was administered to an animal (mouse) in which a cytokine storm was induced, the survival rate was significantly improved as compared with the control to which the saline solution was administered. I found that I could do it. In particular, it was found that dental pulp-derived stem cell EVs (Example 1) can significantly improve the survival rate as compared with adipose-derived stem cell EVs (Example 2) and bone marrow-derived stem cell EVs (Example 3).
This improvement in survival rate suggests that the tissue repair agents of each example may also repair tissues damaged by cytokine storms.

<Evaluation of survival rate of mouse model of lethal disorder by LPS administration (2)>
(2) Confirmation of effect of double administration The cytokine storm was induced in a mouse model, and the effect of improving the survival rate by the tissue repair agent of each example containing exosomes was confirmed in vivo by the following method.
Slc: ICR strain mice were used 10 per group.
Each mouse was administered 30 mg / kg body weight of lipopolysaccharide (LPS), which is a cytokine storm inducer, into the abdominal cavity of the mice.
Six hours after LPS administration, as the first administration, one of the tissue repair agent (purified by ultracentrifugation method) of each example and the control saline solution was applied to each mouse from the tail vein of each mouse. The same amount of 10 μg was administered.
Eighteen hours after LPS administration, as the second administration, one of the tissue repair agents of each example and the control saline solution was administered from the tail vein of each mouse in the same amount of 10 μg per mouse.
The survival rate of the mice in each group was confirmed every 12 hours from 12 hours after LPS administration. The obtained results are shown in FIG.
From FIG. 3, the tissue repair agent of each example was administered to an animal (mouse) in which a cytokine storm was induced, and the survival rate was significantly improved as compared with the control to which the saline solution was administered. I found that I could do it. In particular, it was found that dental pulp-derived stem cell EVs (Example 1) can significantly improve the survival rate as compared with adipose-derived stem cell EVs (Example 2) and bone marrow-derived stem cell EVs (Example 3).
This improvement in survival rate suggests that the tissue repair agents of each example may also repair tissues damaged by cytokine storms.
Furthermore, from the comparison of the results of FIG. 2 and the results of FIG. 3, it was found that the second administration of the tissue repair agent of each example can significantly improve the survival rate as compared with the case of the single administration.
According to Nature communications (2016) 7: 11498, when the anti-IL-6 antibody was administered to C57BL / 6 strain mice to which 600 μg of LPS was administered, LPS was administered to the mice to which the control antibody was administered. It is stated that the survival rate was 75% under the condition that all the mice died 96 hours after the operation. From the description of this paper and the comparison of the results of FIGS. 2 and 3, although there are differences between the mice and the experimental system, the tissue repair agent of each example (particularly the tissue repair agent of Example 1) is evaluated for survival rate. It was found that the effect was almost the same as that of the anti-IL-6 antibody.

<Evaluation of survival rate of mouse model of fatal disorder by LPS administration (3)>
(3) Comparison of purified microparticles and culture supernatant Inducing cytokine storms in a mouse model and culturing dental pulp-derived stem cells to improve the survival rate of the tissue repair agent of Example 1 containing dental pulp-derived stem cell exosomes. Compared with the case of using the supernatant directly, it was confirmed in vivo by the following method.
Slc: Five ICR strain mice were used per group.
Each mouse was administered 30 mg / kg body weight of lipopolysaccharide (LPS), which is a cytokine storm inducer, into the abdominal cavity of the mice.
Six hours after LPS administration, as the first administration, 10 μg of the tissue repair agent of Example 1 (purified by ultracentrifugation method) was applied to each mouse from the tail vein of each mouse, and the culture supernatant of dental pulp-derived stem cells was applied to one mouse. 0.5 ml per mouse and 10 μg of control saline was administered to each mouse. 0.5 ml of the culture supernatant of the pulp-derived stem cells used contains an amount of exosomes corresponding to 10 μg of the tissue repair agent of Example 1.
Eighteen hours after LPS administration, as the second administration, the tissue repair agent of Example 1, the culture supernatant of dental pulp-derived stem cells, and the control saline solution were administered in the same amount as the first administration from the tail vein of each mouse. ..
The survival rate of the mice in each group was confirmed every 12 hours from 12 hours after LPS administration. The obtained results are shown in FIG.
From FIG. 4, the tissue repair agent of Example 1 containing dental pulp-derived stem cell exosomes is administered to an animal (mouse) in which a cytokine storm is induced to directly use the culture supernatant of dental pulp-derived stem cells and It was found that the survival rate could be significantly improved as compared with the control to which the saline solution was administered.
The improvement in the survival rate of the tissue repair agent of Example 1 containing the pulp-derived stem cell exosomes suggests that the tissue damaged by the cytokine storm may be repaired more than when the culture supernatant of the pulp-derived stem cells is directly used. is doing.

<Evaluation of survival rate of mouse model of fatal disorder by LPS administration (4)>
(4) Comparison of purified microparticles and stem cells In the case of inducing a cytokine storm in a mouse model and directly using the pulp-derived stem cells to improve the survival rate of the tissue repair agent of Example 1 containing dental pulp-derived stem cell exosomes. In vivo, it was confirmed by the following method.
Slc: Five ICR strain mice were used per group.
Each mouse was administered 30 mg / kg body weight of lipopolysaccharide (LPS), which is a cytokine storm inducer, into the abdominal cavity of the mice.
Six hours after LPS administration, 10 μg of the tissue repair agent of Example 1 (purified by ultracentrifugation method) was applied to each mouse from the tail vein of each mouse, and pulp-derived stem cells were administered to 2 × ¹⁰⁶ cells per mouse in a control manner. A certain physiological saline solution was administered in an amount of 10 μg per mouse. The amount of dental pulp-derived stem cells used (2 × ¹⁰⁶ cells per mouse) is the maximum number of cells administered to normal animals (the maximum number that does not cause lethality), which is an appropriate amount for comparative experiments.
The survival rate of the mice in each group was confirmed every 12 hours from 12 hours after LPS administration. The obtained results are shown in FIG.
From FIG. 5, the tissue repair agent of Example 1 containing dental pulp-derived stem cell exosomes is administered to a cytokine storm-induced animal (mouse) to directly use dental pulp-derived stem cells and saline. It was found that the survival rate could be significantly improved compared with the administered control.
The improvement in the survival rate of the tissue repair agent of Example 1 containing the pulp-derived stem cell exosomes suggests that the tissue damaged by the cytokine storm may be repaired more than the case of using the pulp-derived stem cells directly.

<Repair of damaged tissue>
Regarding the mice used in the evaluation of survival rate (1) to (4), the effect of the tissue repair agent of each example containing exosomes on repairing systemic tissues damaged by cytokine storm, especially all organs, was observed in each mouse. Confirmation was made based on photographs of tissues of all organs such as lungs and liver.
As a result, the tissue repair agent of each example was administered to an animal (mouse) in which a cytokine storm was induced and the amount of each cytokine was increased, as compared with the control to which physiological saline was administered. It was found that each tissue damaged by a cytokine storm can be repaired. In particular, dental pulp-derived stem cell EVs (Example 1) can significantly repair lung tissue and liver tissue damaged by cytokine storms as compared with adipose-derived stem cell EVs (Example 2) and bone marrow-derived stem cell EVs (Example 3). I understand.
Repair of this damaged tissue suggests that it improves the sequelae of cytokine storms.

Claims (18)

Containing microparticles derived from pulp-derived stem cells, adipose-derived stem cells, bone marrow-derived stem cells, umbilical cord-derived stem cells or culture supernatants of these immortalized stem cells.
The microparticles contain extracellular superoxide dismutase (SOD3) in an effective amount or more capable of repairing tissues or cells damaged by a cytokine storm.
A tissue repair agent that repairs tissues damaged by the cytokine storm through suppression of the cytokine storm. The tissue repair agent according to claim 1, wherein the fine particles are exosomes. The tissue repair agent according to claim 1 or 2, wherein the fine particles are fine particles purified from the culture supernatant. The tissue repair according to any one of claims 1 to 3, which suppresses all of IL-2, IL-4, IL-6, IL-10, IL-17, IFNγ and TNFα in cells or blood. Agent. The tissue according to any one of claims 1 to 4, wherein when the tissue repair agent is administered to a human or a non-human animal in a cytokine storm state, the survival rate is improved as compared with the case where the tissue repair agent is not administered. Restorative agent. The tissue repair agent according to any one of claims 1 to 5, wherein the fine particles contain 1.0 ng / mg or more of the SOD3 per 1 mg of the fine particles. The tissue repair agent according to any one of claims 1 to 6, wherein the SOD3 activity is 0.3 unit / μg or more. The tissue repair agent according to any one of claims 1 to 7, which contains 0.01 × 10 ⁸ particles / ml or more of the fine particles. The tissue repair agent according to any one of claims 1 to 7, which contains 2.0 × 10 ⁹ particles / ml or more of the fine particles. 6. The tissue repair agent according to item 1. The tissue repair agent according to any one of claims 1 to 10, wherein the fine particles are fine particles derived from the culture supernatant of the pulp-derived stem cells. The tissue repair agent according to any one of claims 1 to 11, wherein the tissue damaged by the cytokine storm is lung tissue. The tissue repair agent according to any one of claims 1 to 12, wherein the dental pulp-derived stem cell, the adipose-derived stem cell, the bone marrow-derived stem cell, or the umbilical cord-derived stem cell is genetically modified to highly express the SOD. .. The tissue repair agent according to any one of claims 1 to 13, which comprises at least one of an anti-IL-6 antibody and a steroid. The tissue repair agent according to any one of claims 1 to 14 is administered to humans or non-human animals.
It reduces the amount of cytokines in the cells or blood of the human or non-human animal, and
A method of using a tissue repair agent that repairs a tissue damaged by the cytokine storm through suppression of the cytokine storm. The method for using a tissue repair agent according to claim 15, wherein the tissue repair agent is used in combination with at least one of an anti-IL-6 antibody and a steroid. A screening method for factors or combinations thereof that are effective for tissue repair to repair tissues damaged by cytokine storms through suppression of cytokine storms.
Extracellular superoxide dismutase (SOD3) contains one or more components contained in the culture supernatant obtained by culturing dental pulp-derived stem cells, adipose-derived stem cells, bone marrow-derived stem cells, umbilical cord-derived stem cells, or immortalized stem cells thereof. A screening method comprising a step of supplying to an evaluation system relating to SOD3 and evaluating the characteristics relating to SOD3. A tissue repair agent containing a component obtained by evaluating the properties related to SOD3 by the screening method according to claim 17.
The components are derived from pulp-derived stem cells, adipose-derived stem cells, bone marrow-derived stem cells, umbilical cord-derived stem cells, or culture supernatants of these immortalized stem cells.
The component contains extracellular superoxide dismutase (SOD3) in an effective amount or more capable of repairing a tissue or cell damaged by a cytokine storm.
The component satisfies at least one of the fact that SOD3 is contained in an amount of 1.0 ng / mg or more per 1 mg of the component and that the SOD3 activity is 0.3 unit / μg or more.
A tissue repair agent that repairs tissues damaged by the cytokine storm through suppression of the cytokine storm.

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