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Immunomodulatory effect of mesenchymal stem cells and mesenchymal stem-cell-derived exosomes for COVID-19 treatmen Abstract The world has witnessed unimaginable damage from the coronavirus disease-19 (COVID-19) pandemic. Because the pandemic is growing rapidly, it is important to consider diverse treatment options to effectively treat people worldwide. Since the immune system is at the hub of the infection, it is essential to regulate the dynamic balance in order to prevent the overexaggerated immune responses that subsequently result in multiorgan damage. The use of stem cells as treatment options has gained tremend-ous momentum in the past decade. The revolutionary mea-sures in science have brought to the world mesenchymal stem cells (MSCs) and MSC-derived exosomes (MSC-Exo) as thera-peutic opportunities for various diseases. The MSCs and MSC-Exos have immunomodulatory functions; they can be used as therapy to strike a balance in the immune cells of patients with COVID-19. In this review, we discuss the basics of the cyto-kine storm in COVID-19, MSCs, and MSC-derived exosomes and the potential and stem-cell-based ongoing clinical trials for COVID-19. INTRODUCTION The world has been facing a dreadful situation due to the spread of the Severe Acute Respiratory Syndrome–Coronavirus-2 (SARS-CoV-2) (1). However, neither confirmed effective antiviral medications nor vaccines are available to deal with this emer-gency (2). Many reports have suggested that it is the cytokine storm in COVID-19 that leads to acute respiratory distress syndrome (ARDS) (3). The cytokine storm in COVID-19 refers to the fact that a variety of cytokines are rapidly produced after viral infections (4). In addition, such a cytokine storm induces hypoxia, and direct viral infection can cause cellular damage. Multiorgan damage and injury have been concomitant with COVID-19, and can be observed more in patients with a more severe form of the disease (5). Stem cells are specialized cells that can renew themselves by means of cell division and can differentiate into multilineage cells. Mesenchymal stem cell (MSCs) have immunomodulatory features and secrete cytokines and immune receptors that regulate the microenvironment in the host tissue (6). In addition, it has been observed that the crucial role of MSCs in therapy has been mediated by exosomes released by the MSCs. These exo-somes have exhibited immunomodulatory, antiviral, anti-fibrotic, and tissue-repair-related functions in vivo; similar effects have been observed in vitro (6). COVID-19 AND THE IMMUNE SYSTEM The dynamic equilibrium maintained by innate and adaptive immunity is essential for impeding the progression of COVID-19 (7). In patients infected with SARS-CoV-2, the plasma levels of IL-1β, IL-1RA, IL-7, IL-8, IL-10, IFN-γ, monocyte chemoattrac-tant peptide (MCP)-1, macrophage inflammatory protein (MIP)-1A, MIP-1B, G-CSF, and TNF-α are significantly higher than in controls. The levels of these factors are also increased in patients who were admitted to ICUs (8). Similarly, reductions in the levels of T cells and NK cells have been observed in COVID-19 patients (9). The loss of such cells can impair the immune system (10). The levels of the helper T cells, cytotoxic suppressive T cells, and regulatory T cells are much lower in patients with COVID-19 than in their healthy and less severe counterparts. The decrease in the regulatory T cells may hamper their ability to inhibit the chronic inflammation (11). Interes-tingly, a remarkable increase is observed in the naïve T cells, where as the memory T cells are reduced in infected patients (10). The reduced expression of memory cells may be a plau-sible explanation for the increased rates of reinfection by SARS-CoV-2. THE CYTOKINE STORM SARS-CoV-2 binds to the Angiotensin-converting enzyme 2 (ACE2) receptor and enters the host cell (1). During infection, the innate and adaptive immune systems work together to inactivate the virus. Since leukocytes and neutrophils are present in higher concentrations in COVID-19 individuals, these immune cells may result in the cytokine storm (10). After viral entry, the virus induces pyroptosis and cell death. The dead cells recruit macrophages to the site of injury that phago-cytose them. The phagocytes then express damage-associated molecular patterns (DAMPs), which bind to the toll-like receptors (TLR) and induce nuclear factor kappa B (NF-κb) signalling by means of the MyD88 pathway. NF-κb enters the nucleus and catalyzes the transcription of pro-IL-1β and pro-caspase-1. When additional signals are detected, the pro-IL-1β and procaspase 1 are cleaved into IL-1β and caspase 1 (12). The activated NOD-, LRR- and pyrin domain-containing protein 3 (NLRP3) recruits the apoptosis-associated speck-like protein containing a caspase recruitment domain (ASC) and pro-cas-pase-1 to form the NLRP3 inflammasome (13). In addition, the phagocytosis releases ATP, which binds to the P2X purino-ceptor 7 (P2RX7) and activates the inflammasome (14). The increased calcium levels caused by the viral proteins results in lysosomal damage, thereby releasing cathepsins that activate the inflammasome (15). Further, the binding of SARS-CoV-2 to the ACE2 reduces the available ACE2 receptors on the cell surface. This increases the levels of Angiotensin II (AngII) in the extracellular space, because ACE2 converts AngI and AngII into Ang 1-9 and Ang1-7, respectively. AngII increases the levels of TNF-α and IL-6 in the cell that upregulates NF-κb, activating the inflammasome (12). The continuous activation of the inflammasome results in a cytokine storm, which recruits more immune cells, necrosis, and cell death. This inflamma-some pathway further causes tissue injury in various organs (Fig. 1). MSCs AND IMMUNOMODULATION MSCs are predominantly isolated from the bone marrow, adipose tissue, dental pulp, umbilical cord, Wharton’s jelly, placenta, synovial fluid, endometrium, and peripheral blood. These cells exhibit different cell-surface markers and can be used for a variety of treatment options (Table 1). MSCs can undergo in vitro amplification and self-renewal, and have low immunogenicity and immune-modulatory functions; the latter have attracted attention in clinical trials (16). MSCs have been widely used in various cellular therapies, such as pre-clinical studies, as well as in some clinical trials, because of their high safety and efficacy (17, 18). MSCs can exert immune-modu-latory effects in the host cells of both the innate and the adaptive immune system. The direct or indirect interactions of MSCs with the immune cells make the MSCs activate the immunomodulatory responses (19). The immunomodulatory functions of MSCs depend on the environment of the host cells; based on the inflammatory status, the MSCs decide the type of immunoregulatory effect (20). MSCs represent pro-inflammatory immune reactions and anti-inflammatory reactions (21). MSCs regulate the immune system via the transforming growth factor b1 (TGFβ1), which can trigger the proliferation of Tregs, induce IL-6, which prevents the proliferation of neutrophils, and stimulate the prostaglandin E2 (PGE2), which inhibits the antigen presentation by dendritic cells and proliferations of T-effector cells (22, 23). MSCs mediate these kinds of effects by direct contact, where it releases the regulatory cytokines, such as IFN-γ, indoleamine 2,3-dioxygenase, TGFβ, IL-10, and PGE2 (24). Moreover, MSCs can hinder the proliferation and/or func-tions of the CD4+ Th1 and TH17 cells, CD8+ T cells, and the natural killer (NK) cells, mainly by secreting soluble factors, such as TGFβ1 and hepatocyte growth factor (HGF) (16). MESENCHYMAL STEM CELLS (MSCs) AND MSC SECRETOME It has currently become apparent that MSCs induce therapeutic characteristics by a paracrine pathway by releasing bioactive substances known as secretomes (25). MSC-secretomes are made of soluble proteins, including cytokines, chemokines, growth factors, and extracellular vesicles (EVs), which include micro-vesicles and exosomes (26). Stem cells release these secretomes by common secretory mechanisms. When the culture medium or secretome are injected into the patients, the neighboring cells assimilate the molecules by paracrine signalling (27). The exosomes themselves contain numerous bioactive molecules, which include microRNAs (miRNA), transfer RNAs (tRNA), long noncoding RNAs (lncRNA), growth factors, proteins, and lipids. The lipid content of the exosomes provide an added advantage by aiding in the infusion of the exosomes with the plasma membrane of the neighboring cells (28). The molecules involved in regulation of cell growth, proliferation, survival, and immune responses are released by exosomes, are elaborately illustrated in Fig. 2. Upon internalization of the mole-cules in the secretome, the neighboring cells modulate various downstream pathways, including immunomodulation, suppression of apoptosis, prevention of fibrosis, and remodelling of the injured tissues (25). IMMUNOMODULATORY POTENTIAL OF MSC-EXOS Exosomes are nanoparticles with a diameter of 40-150 nm. To generate and isolate the exosomes, MSCs can be conditioned to increase the release of exosomes by treatment with cyto-kines or by serum starvation or hypoxia (29). The exosomes are then purified and can be subsequently introduced into the body. MSC-Exos can inhibit CD4+ and CD8+ T cells and NK cells (30). They inhibited T cells expressing IL-17 and induced IL-10-expressing regulatory cells that are involved with suppression of inflammation. MSC-Exos also aid in suppressing the differentiation of CD4+ and CD8+ T cells by releasing mole-cules like TGFβ and prevent inflammation in vivo (31). Similarly, treatment with MSC-Exos reduced the proliferation and activa-tion of NK cells (32). MSC-Exos could shift macrophages from the M1 to the M2 phenotype, further suppressing pro-inflam-matory states (33). Moreover, sepsis is an important lethal factor in COVID-19 patients, and treatments with MSC-Exos have increased the rate of survival in mice with sepsis (34). Concomitantly, MSC-Exos also suppressed release of the pro-inflammatory factors TNF-α, IFN-γ, IL-6, IL-17, and IL-1β (35) and promoted release of anti-inflammatory factors, such as IL-4, IL-10 and TGF-β (36). Additionally, MSC-Exos also reduced the number of chemokines in the serum when injected (37). These immunomodulatory effects of MSC-Exos have also been attributed to their anti-inflammatory cargo, such as IDO, HLA-G, PD-L1 and galectin-1 (38, 39). These mechanisms are illustrated in Fig. 3. MSC-EXOS THERAPY FOR COVID-19 In COVID-19, multiorgan damage has been seen in many-infected individuals. MSC-Exos is known to alleviate lung injury in asthmatic models and ARDS (40, 41). MSC-Exos may also be useful in the treatment of cardiovascular (42) and renal pro-blems (43). Hence, they can be used to treat organ damage associated with COVID-19. Similarly, MSC-EVs have also exhi-bited inhibitory activity on the hemagglutination of avian, swine, and human influenza viruses (44). Likewise, MSC-Exos lowered the death rate in H7N9 patients without any toxic effects during follow-up examinations (45). In addition, these exosomes consist of adhesion molecules that accurately guide them to the injured site. The usage of the exosomes may be preferred to the MSCs, since they can easily cross the blood-brain barrier, are inexpensive, and cannot undergo independent self-renewal, hence preventing adverse consequences, such as tumor formation. In this pandemic situation, MSC-Exos may be considered as a good treatment option to alleviate the effect of SARS-CoV-2 infection. CURRENT CLINICAL TRIALS OF STEM CELL-BASED THERAPY IN COVID-19 Of late, stem-cell-based studies in the treatment of COVID-19 have been gaining momentum. The efficiency and safety of usage of exosomes that had been obtained from BM-MSCs was recently tested on 24 SARS-CoV-2 patients (46). These patients exhibited moderate to severe ARDS. When the exosomes were introduced into the patients, there were no side effects, and patients improved in clinical status and oxygenation (46). In a similar study, patients treated with MSCs showed a remark-able improvement in pulmonary function, higher levels of peripheral lymphocytes, and a reduction in the cells that trigger the cytokine storm. Interestingly, the MSCs did not exhibit ACE2 or TMPRSS2 expression, showing that they may not be infected with COVID-19 (47). Several clinical trials are in the pipeline for usage of stem cells for the treatment of COVID-19 (Table 2). Wharton’s jelly-derived MSCs (WJ-MSCs), which have been used in various studies based on stem-cell therapy and trials, are in progress for their usage for COVID-19 treatment (48). Moreover, adipose tissue-derived AD-MSCs have been used in a few studies in various doses and protocols for COVID-19 therapy (49). Likewise, a novel trial includes inhalation of MSC-Exos for alleviation of symptoms (50). In addition, MSCs from dental pulp (51) and olfactory mucosa (52) were administered in various doses. MSCs in the clinical trials are predominantly administered intravenously; i.v. injection and, in some studies, MSCs have been given as adjuvant therapy in addition to drugs like oseltamivir, hormones, hydroxychloroquine, and azithromycin (53, 54). These trials reveal promising new routes for the battle against COVID-19 (55-94). FUTURE DIRECTIONS Stem cells have been studied extensively for their ability to regenerate and for the treatment of various diseases. Recently, we devised an improved protocol for the isolation of urine-derived stem cells and their further differentiation into immune cells (95). Moreover, our research group promoted the hematopoietic differentiation of hiPSCs using a novel small molecule (96). At the advent of COVID-19, it has become mandatory to discover therapeutic strategies that are easily reproducible and cost effective. Drugs currently available for the treatment of COVID-19 include ones that target viral replication. These drugs include camo-stat mesylate, which is involved in the inhibition of viral fusion to the cell membrane, and favipiravir and remdesivir, which are anti-viral drugs. However, because the cytokine storm is found predominantly in COVID-19 patients, it is essential to consider drugs that inhibit viral replication while treating the cytokine storm. Hence, MSC-Exos may be appropriate therapeutic agents for COVID-19 (97). MSCs can be more advantageous than other anti-inflammatory agents, because they can provide immunomodulatory effects based on the host cells. In addition to these effects, MSCs can prevent fibrosis of tissues, enable reversal of lung dysfunction, and aid in the regeneration of damaged tissue, which can be significantly beneficial for COVID-19-associated organ damage (98, 99). Because the healing properties of the MSCs can be primarily attributed to the secretomes or exosomes, using them may be more effective than using MSCs themselves. Exosomes can be mass-produced, administered systematically with minimaltoxicity, and be able to reach the cell targets more efficiently. In addition to their inherent immunomodulatory potential, the MSC-Exos can also be used as a drug-delivery system (100). MSC-Exos can be modified in vivo to release exosomes that have a higher immunomodulatory potential (101) and can be cultured using various cytokines to exhibit an anti-inflammatory state (102). Although MSC-Exos appear to be promising thera-peutic agents for COVID-19, more experimental research is necessary for them to be used clinically. Moreover, it is es-sential to optimize the protocols for storage and isolation of MSC-Exos for the treatment of COVID-19. It is also imperative to do experiments to understand the underlying mechanisms of COVID-19 in order to optimize MSC-Exo therapy for treatment (97). Further, it is also essential to find the optimum dosage, route of administration, and treatment schedule for MSC-Exos. Hence, since MSCs are more widely studied in these aspects than are MSC-Exos, they are predominantly preferred in clinical trials for COVID-19 (103). CONCLUDING REMARKS COVID-19 has invoked frenzy in individuals worldwide. The unceasing increase of infection and death has halted the lives of the citizens of countries everywhere. Hence, it is important to discover novel therapeutic platforms and productive measures without further delay (104). The therapies produced must be easily reproducible and available in large quantities so that enough bioactive molecules will be available for all indivi-duals who have succumbed to COVID-19. MSCs and MSC-Exos can be used for their immunomodulatory effects in indi-viduals with COVID-19. ACKNOWLEDGEMENTS The author Dr. VB would like to thank Bharathiar University for providing the necessary infrastructure facility and Project funded and supported by MHRD-RUSA 2.0 – BEICH to carry out this manuscript of diagnostic and therapeutic approaches (Ref No. BU/RUSA/BEICH/2019/65). Dr. SMD would like to thank the Science and Engineering Research Board (SERB) (ECR/2018/000718), Government of India, New Delhi, for providing necessary help in carrying out this review process. The study was supported by a grant from the National Research Foundation (NRF) funded by the Korean government (Grant no: 2019M3A9H1030682). CONFLICTS OF INTEREST The authors have no conflicting interest. Fig. 1 Role of cytokine storm in COVID-19. When SARS-CoV-2 binds the cell, the ACE2 receptors become occupied. This increases AngII which results in lung fibrosis, inflammation, and damage. The infected cell also undergoes cell death as a result of the viral in-fection. Macrophages engulf the dead cells and release DAMPSs, which bind the TLR and activated NF-κb by means of MyD88. Activated NF-κb binding activates the inflammasome. Binding of the virus to the receptor also upregu-lates IL-6 and TNF-αlpha, further activa-ting NF-κb. Increase in ATP binds the-P2X7 receptor, which in turn increases Ca2+, which causes lysosomal damage and further activation of the inflamma-some. Continuous activation of the in-flammasome produces the cytokine storm, resulting in multiorgan damage. Fig. 2 Molecules released by MSC-Exos. MSC-Exos affect their targets by means of various molecules that they secrete. The MSC-Exos secrete molecules that maintain the homeostasis in the neighboring cells while also secreting glycolytic enzymes. Other molecules involved in cell growth, proliferation, and modulation of the immune response and signalling pathways are secreted by the MSC-Exos. Some membrane-bound molecules that aid in cell signalling and miRNAs with various functions are also released by MSC-Exos. Fig. 3 MSC-Exos therapy for COVID-19. Isolated MSCs are condi-tioned in specialized media that induce release of exosomes. The MSCs identify the external signal and start to pack regulatory factors in secretory vesicles that are released into the culture medium. The exosomes are identified and isolated using specific markers, and are then administered intravenously the i.v. injection. The exosomes inhibit IL-1, IL-6, NK cells, CD4+, and CD8+. This results in suppression of the cytokine storm. Exosomes also activate IL-10, TGF-βeta, M2 macrophages, and T and B regulatory cells to further suppress the immune system. This reduces the proinflammatory cytokines, alleviating symptoms and aiding in recovery of patients. Table 1 Commonly used sources of MSCs S. No Source Extraction route Purity level Proliferation rate Doubling time MSCs Marker 1. Bone Marrow Bone Marrow Aspiration High Lowest 40 Hrs Stro-1, CD271, SSEA-4, CD146 2. Adipose Tissue Liposuction, lipectomy Medium Higher 5 days CD271, CD146 3. Dental pulp Tooth extraction or root canal Low High 30-40 Hrs Stro-1, SSEA-4, CD146 4. Umbilical Cord After birth from umbilical cord High Medium 30 Hrs CD146 5. Wharton’s jelly After birth from umbilical cord High High 30 Hrs CD73, CD90, CD105 6. Placenta Obtained after delivery High High 36 Hrs SSEA-4, CD146 7. Synovial Fluid Synovium or synovial fluid High High 10 days Stro-1, SSEA-4, CD146 8. Endometrium Endometrium biopsies or menstrual blood High High 18-36 Hrs Stro-1, CD146 9. Peripheral Blood Density Gradient Centrifugation Low Low 95 Hrs CD133 Table 2 Ongoing stem cell based clinical trials in COVID-19 Study title Intervention Study size Description Status Country Reference Treatment of COVID-19 patients using Wharton’s Jelly-Mesenchymal Stem Cells WJ-MSCs 5 Dose: 3 IV doses of 1×10e6/kg Phase 1 Jordan 55 Time: 3 days apart Safety and Efficacy study of Allogenic Human Dental Pulp Mesenchymal Stem Cells to Treat Severe COVID-19 Patients Allogenic Human Dental Pulp MSCs 20 Dose: IV of 3.0x10e7 human dental pulp stem cell solution (30 ml) on day 1, day 4 and day 7 Phase 2 China 56 Placebo: Intravenous Saline IV of 3 ml of 0.9% saline at the same interval NestCell Mesenchymal Stem Cells to Treat Patients with Severe COVID-19 Pneumonia NestCell 66 Dose: 2×107 cells (20 million cells) Phase 1 Brazil 57 Time: days 1, 3 and 5 in addition to standard care. On day 7, cells will only be administered if necessary A Randomized, Double-Blind, Placebo-Controlled Clinical Trial to Determine the Safety and Efficacy of Hope Biosciences Allogeneic Mesenchymal Stem Cell Therapy (HB-adMSCs) to Provide Protection Against COVID-19 HB-adMSCs 100 3 groups of patients, will receive five IVs at 200, 100 and 50 million cells/dose Phase 2 USA 58 Infusions will occur at week 0, 2, 6, 10 and 14. Placebo is saline Clinical Trial to Assess the Safety and Efficacy of Intravenous Administration of Allogeneic Adult Mesenchymal Stem Cells of Expanded Adipose Tissue in Patients With Severe Pneumonia Due to COVID-19 Allogenic expanded adMSCs 26 Two doses of 80 million adipose-tissue derived mesenchymal stem cells Phase 2 Spain 59 A Clinical Trial to Determine the Safety and Efficacy of Hope Biosciences Autologous Mesenchymal Stem Cell Therapy (HB-adMSCs) to Provide Protection Against COVID-19 HB-adMSCs 56 Dose: five IV infusions Phase 2 USA 60 Time: follow-up inflammatory data will be obtained at 6, 14, 26 weeks; and PHQ-9 Questionnaires at weeks 2, 6, 10, 14, 18, 22, 26 Novel Coronavirus Induced Severe Pneumonia Treated by Dental Pulp Mesenchymal Stem cells Dental pulp MSCs 24 Dose: 1.0×106 cells/kg Early Phase 1 China 51 The injection of dental mesenchymal stem cells will be increased on day 1, 3 and 7 Mesenchymal Stem Cell Treatment for Pneumonia Patients Infected With COVID-19 MSCs 20 China 61 Treatment With Mesenchymal Stem Cells for Severe Corona Virus Disease 2019 (COVID-19) MSCs 90 3 times of MSCs (3.0*10E7 MSCs intravenously at Day 0, Day 3, Day 6) Phase 1 China 62 Saline containing 1% Human serum albumin (solution of MSC) Bone Marrow-Derived Mesenchymal Stem Cell Treatment for Severe Patients With Coronavirus Disease 2019 (COVID-19) BM-MSCs 20 Participants will receive conventional treatment plus BM-MSCs (1*10E6/kg body weight intravenously at Day 1) Phase 2 China 63 Study of Human Umbilical Cord Mesenchymal Stem Cells in the Treatment of Severe COVID-19 UC-MSCs 48 4 times of UC-MSCs (0.5*10E6 UC-MSCs/kg body weight intravenously at Day 1, Day 3, Day 5, Day 7) Not yet recrui-ting China 64 Safety and Effectiveness of Mesenchymal Stem Cells in the Treatment of Pneumonia of Coronavirus Disease 2019 Drug: Oseltamivir and hormones MSCs 60 Umbilical cord mesenchymal stem cells were given at 106/Kg body weight/time, once every 4 days for a total of 4 times Peripheral intravenous infusion was given within 3 days of first admission Early Phase 1 China 53 Clinical Research of Human Mesenchymal Stem Cells in the Treatment of COVID-19 Pneumonia UC-MSCs 30 1*10E6 UC-MSCs/kg suspended in 100 ml saline Phase 2 China 65 Mesenchymal Stem Cell Therapy for SARS-CoV-2-related Acute Respiratory Distress Syndrome Cell therapy 60 Protocol 1 (n=20). Two doses of MSCs 100×10e6 (± 10%) at Day 0 and Day 2 plus Conventional treatment Phase 3 Iran 66 Protocol 2: Two doses of MSCs 100×10e6 (± 10%)at Day 0 and Day 2, intravenously plus two doses of EVs at Day 4 and Day 6 plus conventional treatment Role of Immune and Inflammatory Response in Recipients of Allogeneic Haematopoietic Stem Cell Transplantation (SCT) Affected by Severe COVID19 No intervention 40 Comparison of biomarkers Active, not re-cruiting United King-dom 67 Use of UC-MSCs for COVID-19 Patients UC-MSCs 24 UC-MSC will be administered at 100×106 cells/infusion administered intravenously in addition to the standard of care treatment Phase 2 USA 68 Stem Cell Educator Therapy Treat the Viral Inflammation in COVID-19 Stem Cell Educator-Treated Mononuclear Cells Apheresis 20 SCE therapy circulates a patient’s blood through a blood cell separator, briefly cocultures the patient’s immune cells with adherent CB-SC in vitro, and returns the autologous immune cells to the patient’s circulation Phase 2 USA 69 Efficacy and Safety Study of Allogeneic HB-adMSCs for the Treatment of COVID-19 Drug: HB-and MSC 110 Dose: 4 IV of HB-adMSCs at 100 million cells/dose + hydroxychloroquine and azithromycin Phase 2 USA 54 Drug: Placebo HB-adMSC infusions will occur at day 0, 3, 7, and 10 Drug: HC Placebo: similar intervals without the HB-adMSCs Drug: AZ Therapy for Pneumonia Patients Infected by 2019 Novel Coronavirus Biological: UC-MSCs N.A 0.5*10E6 UC-MSCs/kg body weight suspended in 100 ml saline containing 1% human albumin intravenously at Day 1, Day 3, Day 5, Day 7 With-drawn China 70 Battle Against COVID-19 Using Mesenchymal Stromal Cells Allogeneic and expanded adipose tissue-derived MSCs 100 Two serial doses of 1.5 million adipose-tissue derived mesenchymal stem cells/kg Phase 2 Madrid 71 Safety and Efficacy of CAStem for Severe COVID-19 Associated With/Without ARDS CAStem 9 A dose-escalation with 3 cohorts with 3 patients/cohort who receive doses of 3, 5 or 10 million cells/kg Phase 2 China 72 ASC Therapy for Patients With Severe Respiratory COVID-19 Stem Cell Product 40 100 million allogeneic adipose-derived mesenchymal stromal cells diluted in 100 ml saline Phase 2 Denmark 73 Mesenchymal Stem Cells (MSCs) in Inflammation-Resolution Programs of Coronavirus Disease 2019 (COVID-19) Induced Acute Respiratory Distress Syndrome (ARDS) MSC 40 Infusion of allogeneic bone marrow-derived human mesenchymal stem (stromal) cells Phase 2 Germany 74 Umbilical Cord(UC)-Derived Mesenchymal Stem Cells(MSCs) Treatment for the 2019-novel Coronavirus (nCOV) Pneumonia UC-MSCs 10 UC-MSCs infusion intravenously on day 1, day 3, day 5, and day 7 Phase 2 China 75 A Pilot Clinical Study on Inhalation of Mesenchymal Stem Cells Exosomes Treating Severe Novel Coronavirus Pneumonia MSCs-derived exosomes 30 5 times aerosol inhalation of MSCs-derived exosomes (2.0*10E8 nano vesicles/3 ml at Day 1, Day 2, Day 3, Day 4, Day 5) Phase 1 China 50 MultiStem Administration for COVID-19 Induced ARDS (MACoVIA) MultiStem 400 IV infusion of MultiStem Phase 3 USA 76 Cell Therapy Using Umbilical Cord-derived Mesenchymal Stromal Cells in SARS-CoV-2-related ARDS UC Wharton’s jelly-derived human 60 Dose: 1 million/kg through an intravenous route Phase 2 France 48 Placebo: NaCl 0.9% Treatment of Severe COVID-19 Pneumonia With Allogeneic Mesenchymal Stromal Cells (COVID_MSV) Mesenchymal Stromal Cells 24 IV injection of 1 million MSV cells/Kg diluted in 100 ml saline Phase 2 Spain 77 Mesenchymal Stromal Cells for the Treatment of SARS-CoV-2 Induced Acute Respiratory Failure (COVID-19 Disease) Mesenchymal Stromal Cells 30 Dose:1 × 108 MSCs through IV Early Phase 1 USA 78 Repair of Acute Respiratory Distress Syndrome by Stromal Cell Administration (REALIST) (COVID-19) Remestemcel-L 300 Administered twice during the first week, with the second infusion at 4 days following the first injection (± 1 day) Phase 3 USA 79 Treatment of Covid-19 Associated Pneumonia With Allogenic Pooled Olfactory Mucosa-derived Mesenchymal Stem Cells Allogenic pooled olfactory mucosa-derived MSCs 40 IV injection Phase 2 Minsk 52 Autologous Adipose-derived Stem Cells (AdMSCs) for COVID-19 Autologous adMSCs 200 3 doses of 200 million cells through IV every 3 days Phase 2 USA 49 Mesenchymal Stem Cell Infusion for COVID-19 Infection MSCs 20 Dose: 2 × 106 cells/kg, administered on day 1, 7 in addition to supportive care Phase 2 Pakistan 80 Safety and Efficacy of Mesenchymal Stem Cells in the Management of Severe COVID-19 Pneumonia (CELMA) UC-MSCs 30 Dose: 1*106 cells/Kg Phase 2 USA 81 Mesenchymal Stem Cell for Acute Respiratory Distress Syndrome Due for COVID-19 (COVID-19) MSC 10 Dose: 1 million/Kg Phase 2 Mexico 82 NestaCellⓇ Mesenchymal Stem Cell to Treat Patients With Severe COVID-19 Pneumonia (HOPE) NestaCellⓇ 90 Dose : 2×107 cells on days 1, 3, 5 and 7 Phase 2 Brazil 83 Treatment With Human Umbilical Cord-derived Mesenchymal Stem Cells for Severe Corona Virus Disease 2019 (COVID-19) UC-MSCs 100 Dose: 3 of 4.0*10E7 cells at Day 0, Day 3, Day 6 Phase 2 China 84 Efficacy of Intravenous Infusions of Stem Cells in the Treatment of COVID-19 Patients MSCs 20 IV injection of Cultured stem cells at days 1, 3 and 5 Phase 2 Turkey 85 Clinical Use of Stem Cells for the Treatment of Covid-19 MSCs 30 Dose: 3 million cells/kg on days 0, 3 and 6 Phase 2 Turkey 86 Safety and Efficacy of Intravenous Wharton’s Jelly Derived Mesenchymal Stem Cells in Acute Respiratory Distress Syndrome Due to COVID 19 WJ-MSCs 40 2 doses Phase 2 Colombia 87 MSCs in COVID-19 ARDS Remestemcel-L 300 Twice in the first week with a gap of 4 days between the injections Phase 3 USA 88 Efficacy and Safety Evaluation of Mesenchymal Stem Cells for the Treatment of Patients With Respiratory Distress Due to COVID-19 (COVIDMES) WJ-MSCs 30 Administration along with standard care Phase 2 Spain 89 Cellular Immuno-Therapy for COVID-19 Acute Respiratory Distress Syndrome - Vanguard (CIRCA-19) MSCs 9 IV administration Phase 1 Canada 90 ACT-20 in Patients With Severe COVID-19 Pneumonia Allogenic UC-MSCs 70 1 million cells/kg body weight in 100 ml in conditioned media Phase 2 91 Study of the Safety of Therapeutic Tx With Immunomodulatory MSC in Adults With COVID-19 Infection Requiring Mechanical Ventilation Allogenic BM-MSC 45 IV administration Phase 1 USA 92 Double-Blind, Multicenter, Study to Evaluate the Efficacy of PLX PAD for the Treatment of COVID-19 MSCs 140 15 IM injections (1 ml each). Twice with an interval of 1 week Phase 2 USA 93 A Study of Cell Therapy in COVID-19 Subjects With Acute Kidney Injury Who Are Receiving Renal Replacement Therapy MSCs and a plasmapheresis device 24 Administered through integration into a Continuous Renal Replacement Therapy circuit Phase 2 94 WJ: Wharton’s Jelly; MSC: Mesenchymal stem cells; adMSCs: adipose derived MSCs; UC: Umbilical cord; IV: Intravenous; BM: Bone marrow; HC: hydroxychloroquine; AZ: azithromycin.

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