Biomolecules & Therapeutics 2020; 28(1): 34-44
Differentiation of Human Mesenchymal Stem Cells towards Neuronal Lineage: Clinical Trials in Nervous System Disorders
Rosa Hernández1,2,3,†, Cristina Jiménez-Luna1,2,4,†, Jesús Perales-Adán1, Gloria Perazzoli1,3, Consolación Melguizo1,2,3,* and José Prados1,2,3
1Institute of Biopathology and Regenerative Medicine (IBIMER), Center of Biomedical Research (CIBM), University of Granada, Granada 18100,
2Department of Anatomy and Embryology, University of Granada, Granada 18016,
3Biosanitary Institute of Granada (ibs.GRANADA), Granada 18012, Spain,
4Department of Oncology, Ludwig Institute for Cancer Research, University of Lausanne, Epalinges 1066, Switzerland
Tel: +34-958249322, Fax: +34-958246296
The first two authors contributed equally to this work.
Received: April 17, 2019; Revised: August 12, 2019; Accepted: August 12, 2019; Published online: October 25, 2019.
© The Korean Society of Applied Pharmacology. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Mesenchymal stem cells (MSCs) have been proposed as an alternative therapy to be applied into several pathologies of the nervous system. These cells can be obtained from adipose tissue, umbilical cord blood and bone marrow, among other tissues, and have remarkable therapeutic properties. MSCs can be isolated with high yield, which adds to their ability to differentiate into non-mesodermal cell types including neuronal lineage both in vivo and in vitro. They are able to restore damaged neural tissue, thus being suitable for the treatment of neural injuries, and possess immunosuppressive activity, which may be useful for the treatment of neurological disorders of inflammatory etiology. Although the long-term safety of MSC-based therapies remains unclear, a large amount of both pre-clinical and clinical trials have shown functional improvements in animal models of nervous system diseases following transplantation of MSCs. In fact, there are several ongoing clinical trials evaluating the possible benefits this cell-based therapy could provide to patients with neurological damage, as well as their clinical limitations. In this review we focus on the potential of MSCs as a therapeutic tool to treat neurological disorders, summarizing the state of the art of this topic and the most recent clinical studies.

Keywords: Mesenchymal stem cells, Nervous system disorders, Cell-based therapy, Neuronal differentiation, Clinical trials

Stem cells are a population of unspecialized cells with the ability to both self-renew and give rise to multiple cell types (Ahmadi et al., 2012). The stem cell niche consists of a heterogeneous cell population, extracellular matrix and different soluble factors, which together provide a suitable microenvironment (Ferroni et al., 2013) for the maintenance of these cells. Stem cells can be classified according to their differentiation capacity into: i) totipotent stem cells, which can generate all cell types of the organism, including embryonic and extraembryonic tissues (Sun and Ma, 2013); ii) pluripotent stem cells, which can differentiate into cell types from any of the three germ layers, thus being able to differentiate into all cells of the adult organism (Mahla, 2016); iii) multipotent stem cells, which can give rise to all cells derived from one specific lineage (Jopling et al., 2011); and finally, iv) unipotent stem cells, which can only generate one cell type (Jaenisch and Young, 2008).

Despite sharing common properties, stem cells exhibit different features when they originate from different sources (Kalladka and Muir, 2014). In fact, stem cells can be categorized as embryonic stem cells (ESCs), fetal stem cells (FSCs), perinatal stem cells (PSCs), adult stem cells (ASCs) and induced pluripotent stem cells (iPSCs). ESCs have the advantage of being pluripotent, although their use involves high risk of tumorigenicity and generates a great ethical controversy, since they derive from embryo at the blastocyst stage (Nadig, 2009). Interestingly, iPSCs have similar characteristics to ESCs, including pluripotency, but are generated from adult somatic cells by epigenetic reprogramming and thus they can be used without ethical debate (Salehi et al., 2016). FSCs are derived from fetal tissues, even though they exhibit a lower division capacity than ESCs (Ilic and Polak, 2011). PSCs are multipotent cells that derive from perinatal extraembryonic tissues and share properties with ESCs and ASCs (Si et al., 2015). The latter, i.e., ASCs, are multipotent cells present in most adult tissues, where they play a key role in tissue regeneration (Nadig, 2009; Mahla, 2016).

The exciting potential of stem cells in tissue regeneration and repair provides an alternative approach to cell-based therapies in various diseases, especially in those that affect the nervous system (NS) (Gage and Temple, 2013). In fact, stem cells may replace some non-functional cells in neurodegenerative disorders and NS lesions (Lunn et al., 2011). In this context, mesenchymal stem cells (MSCs), which are adult stem cells derived from the mesoderm and neuroectoderm (Ferroni et al., 2013), exhibit a high differentiation plasticity. These cells present some advantages compared to other stem cells such as neural stem cells (NSCs), namely lack of teratoma formation capacity since they derive from adult tissues and ability to migrate towards inflammatory foci through expression of chemokine receptors (Honczarenko et al., 2006; Wakao et al., 2012; Laroni et al., 2015; Frese et al., 2016). Moreover, the use of MSCs could avoid the toxicity of the immunosuppressive regimens used with NCS (Fu et al., 2008).

Previous review articles have discussed the MSCs ability to differentiate into neurons and their possible application in clinical trials (Scuteri et al., 2011; Ullah et al., 2015; Squillaro et al., 2016). This review summarizes the potential of MSCs in regenerative medicine applied to neurological disorders, and offers a comprehensive compilation of the most recent clinical studies that employ this type of cell therapy.


MSCs are considered multipotent cells able to give rise to all cell types of mesodermal origin, including bone, cartilage and fat cells. However, their ability to differentiate into non-mesodermal cell types such as neurons has been widely reported (Drela et al., 2013; Salehi et al., 2016). Although these cells were isolated for the first time from bone marrow (Friedenstein et al., 1974), they reside in almost all tissues, with adipose tissue, placenta and umbilical cord being the most used MSC sources (Ferroni et al., 2013; Teixeira et al., 2013).

In recent decades, MSCs have been hailed as a therapeutic promise in regenerative medicine due to their accessibility and ease of in vitro expansion, reduced immunogenic properties (Salehi et al., 2016) and broad differentiation ability compared to other ASCs types (Drela et al., 2013; Ferroni et al., 2013). The International Society for Cellular Therapy (ISCT) established three minimal criteria for the correct identification of MSCs: i) plastic adherence; ii) positive expression of the CD73, CD90 and CD105 markers and negative for CD34, CD45, HLA-DR, CD14 or CD11B, CD79α or CD19; and iii) capacity of in vitro differentiation into adipocytes, chondrocytes and osteoblasts (Teixeira et al., 2013). Nevertheless, it has been reported that these stem cells may have variable biological features according to the source, the donor or the culture conditions (Han et al., 2017). In addition, the ability of MSCs to differentiate into cells of the neuronal lineage has been questioned. In fact, some stressful culture conditions can produce morphological changes and alter protein expression in MSCs without necessarily turning them into neurons. Among these conditions, serum deprivation, cell fusion or the addition of some components to differentiation media (e.g., dimethyl sulfoxide or β-mercaptoethanol) (Lu et al., 2004; Krabbe et al., 2005; Croft and Przyborski, 2006) have been assayed. However, more recent research has demonstrated successful and stable neuronal differentiation corroborated by multiple techniques both in vitro and in vivo (Mareschi et al., 2006; Zhang et al., 2006; Takeda and Xu, 2015).


Contrary to drug-based treatments, therapies employing living cells have the advantage of dynamically responding to a time-changing environment, rather than being focused on a single way of action (Kalladka and Muir, 2014). In order to treat neurological injuries with MSCs, these cells can be obtained from different sources such as the umbilical cord (HU-MSCs) (Hong et al., 2011), bone marrow (BM-MSCs) (Mahmood et al., 2003), amniotic fluid (Yan et al., 2013) or adipose tissue (AD-MSCs) (Gao et al., 2014a). However, no accurate studies comparing the functionality of MSCs according to their source have been conducted. Once implanted in the injured region, MSCs can exert the following therapeutical mechanisms: secretion of neurotrophic factors (Nagai et al., 2007), induction of neurogenesis and astroglial activation (Yoo et al., 2008), axon growth and enhancement of synaptic connections (Maltman et al., 2011), anti-apoptotic, immunomodulatory (Wang et al., 2012; Budoni et al., 2013) and antiinflammatory effects (Hawryluk et al., 2012), reduction of oxidative stress (Kemp et al., 2010; Chen et al., 2011), secretion of exosomes containing a wide range of bioactive molecules (Kim et al., 2012; Tomasoni et al., 2013), and expression of a great number of genes related to neuronal processes and transcription factors (Arboleda et al., 2011).

In general, transplanted MSCs are previously reprogrammed in vitro with the aim of improving their survival and accelerating their differentiation into nervous cells (Lu et al., 2001; Mahmood et al., 2002). In vitro reprogramming of MSCs towards neuronal lineage can be achieved through four different strategies (Fig. 1A): psychotropic drugs, small molecules, enriched media and epigenetic modifications. On the contrary, other research groups have transplanted MSCs not previously reprogrammed (Bhang et al., 2007), and even followed by the injection of growth factors in the treated zone (Liu et al., 2014).

It is known that some drugs, namely antidepressants and antipsychotics, can increase proliferation and differentiation rates of MSCs into neurons (Nakagawa, 2010). These drugs have proved to reverse gray matter loss and slow down the reduction in brain volume in patients with neurodegenerative disorders such as schizophrenia or depression. However, the mechanisms by which this occurs are not completely understood (Nasrallah et al., 2010), although it has been observed that inhibiting glycogen synthase kinase-3β (GSK-3β) plays a key role in the proliferation of hippocampal neuronal precursor cells (Morales-Garcia et al., 2012). Atypical antipsychotic drugs like risperidone, olanzapine and aripiprazole, and antidepressants like desvenlafaxine (Asokan et al., 2014) have proved to increase in vitro neurogenesis and neuron maturation in rat models, respectively. Additionally, the antidepressants imipramine, desipramine, fluoxetine and tianeptine have shown improved differentiation efficiency of rat MSCs into neuron-like cells (Borkowska et al., 2015).

Small molecules are also emerging as cutting-edge tools in the pharmacotherapy of brain injuries. They can imitate the activity of endogenous proteins and modulate certain signaling pathways. Among these small molecules, a plethora of GSK-3β inhibitors stand out, particularly lithium, a mood stabilizer that accumulates in neurogenic brain regions and increases adult hippocampal neurogenesis (Boku et al., 2010; Zanni et al., 2017). Vitamin derivatives such as retinoic acid, known to induce differentiation of MSCs into neurogenic cells (Gao et al., 2014b; Halder et al., 2015), also play a role in the differentiation of neural progenitors. Finally, Alexanian et al. (2013) tested a combination of SMAD signaling inhibitors (SMAD1/3 and SMAD3/5/8) with chromatin modifying agents (trichostatin A and RG108) and modulators of cAMP levels, showing a high rate of BM-MSCs differentiation into neuron-like cells and an enhanced formation of synaptic-like structures. In addition, enrichment of culture media with growth factors and other inductor substances allow the in vitro differentiation of MSCs towards various cell types with morphological and functional differences (Zhu et al., 2009; Kajiyama et al., 2010; Ferro et al., 2011). Since the publication of the first neuronal differentiation medium for MSCs in 2000 (Woodbury et al., 2000), a number of media have been used for this purpose. Table 1 summarizes the substances most commonly employed and the neuronal markers most frequently studied to evaluate the differentiation efficiency of MSCs.

Epigenetic changes lead MSCs to a particular lineage by repressing genes related to the undifferentiated state and expressing those associated with differentiation (Teven et al., 2011; Herlofsen et al., 2013). A recent study stated that changes in the neuronal phenotype of MSCs can be a result of epigenetic modifications (Alexanian, 2015). Exposing MSCs to epigenetic modifiers and neuronal induction factors turns them into neuronal lineage-like cells, suggesting that cell plasticity can be handled by combining epigenetic modulating enzymes and specific signaling pathways. Nevertheless, the mechanisms by which MSCs undergo trans-differentiation are still unclear. Alexanian (2015) developed a protocol for neuronal differentiation based on testing various epigenetic modulators such as trichostatin (TSA), valproic acid (VPA), sodium butyrate, DNZep, RG108, 5-aza-dC, zebularine or BIX 01294, in combination with substances that promote iPSCs differentiation into neuronal lineage. These authors demonstrated that chromatin-modifying compounds increase the plasticity of already differentiated cells and make them suitable to respond to differentiation-inducing signals. Some studies have shown that the exposure of MSCs to VPA, a histone deacetylase inhibitor, leads to overexpression of specific markers of neural progenitors like GFAP and nestin (Dong et al., 2013). Fila-Danilow et al. (2017) confirmed that TSA and VPA affected the expression of neuronal lineage genes, and inhibited cell proliferation and neurospheres formation in a culture of rat MSCs.

Genetic modifications of MSCs can be an effective method to achieve a faster and more durable neuronal differentiation, either alone or in combination with differentiation media. Genetically modified MSCs have demonstrated the potential to secrete brain-derived neurotrophic factors, such as BDNF, VEGF, NGF, IGF-1 (Song et al., 2009; Gu et al., 2010; Wyse et al., 2014) and neurotrophins (Zhang et al., 2012), among others, and to serve as cellular vehicles for pro-drug gene therapy (Choi et al., 2012) to treat neurodegenerative disorders. The manipulation of MSCs towards a desired epigenetic status for their differentiation into the proper neuronal lineages could be the tool for the development of alternative cell therapies focused on neurodegenerative disorders.


The plasticity of MSCs has allowed the development of numerous clinical trials, many of which have not yet been completed (Table 2). However, data from the most recent ones show that the use of MSCs to treat NS pathologies does not imply adverse effects or structural changes. Furthermore, the increasing amount of positive results in vivo in phase I and II trials suggests that the transplantation of MSCs may lead to functional improvements and tissue regeneration.

After trauma, normal brain functioning may be disrupted, producing severe physical and emotional damage, which is known as traumatic brain injury (TBI). It has been shown that MSCs have potential applications in TBI to reduce brain damage and clinical sequelae. In fact, MSCs can reduce inflammation through immunosuppressive mechanisms and induce the secretion of growth factors that benefit neurons (Hasan et al., 2017). Two recent clinical trials, NCT02742857 and NCT02525432, use intrathecal and intravenous transplantation of MSCs to improve the prognosis of patients with TBI, although results are ongoing. Stroke occurs when a sudden interruption of blood flow takes place in the brain. Currently, TBI is one of the main objectives for the application of MSCs (Fig. 1B). The possibility that MSCs may be implanted into injury as self-renewing neuronal cells has been assayed (Maria Ferri et al., 2016). In fact, the use of the modified SB623 stem cells in this pathology improved the clinical evolution of the patient for at least one year. Numerous clinical trials are underway using BM-MSCs, HU-MSCs or placenta-derived cells transplanted by different methods to determine the utility of this therapy in stroke (Table 2).

On the other hand, spinal cord injury (SCI) triggers a severe loss of motor, sensory, and autonomic functions that lack proper treatment. The neurological deficit results from the direct trauma associated with a secondary injury characterized by local immune reaction, apoptosis of neurons, tissue atrophy with cavitation and glial scar formation (Fig. 1C). Recently, it has been demonstrated that MSCs promote the repair of spinal cord tissues in animal models, suggesting their potential clinical use (Qu and Zhang, 2017). A clinical trial using repeated doses of autologous BM-MSCs by subarachnoid route (NCT02165904) showed no secondary effects -at least after one year-, and functional improvements were reported. Some other studies showed similar results (NCT02352077, NCT01909154, NCT01325103).

Multiple sclerosis and amyotrophic lateral sclerosis (ALS) may be excellent candidates for MSCs-based therapies. The former is an inflammatory disease in which activated T cells induce axonal demyelination and neurological disability. The latter is a neurodegenerative disorder characterized by major alterations of the neuromuscular system with an unknown etiology, although the activity of the immune system is thought to play a relevant role. In both conditions, the therapeutic plasticity of MSCs may benefit the evolution and prognosis of the patients (Fig. 1D) (Ardeshiry Lajimi et al., 2013; Lewis and Suzuki, 2014). A recent clinical trial employing autologous BM-MSCs intrathecally followed by MSCs conditioned media to treat multiple sclerosis (NCT01895439) showed improvements in all the tests conducted (except for lesion volume), demonstrating the safety and feasibility of this treatment. A more recent study (NCT01933802) using the same cells and route of administration improved muscular strength and bladder function with minor secondary effects. In relation to ALS, a recent phase II study (NCT01777646) showed that MSCs induced the secretion of neurotrophic factors, and slowed its natural progression without adverse effects for at least 6 month. Similar results were observed in other studies employing MSCs from different sources and with different routes of administration (NCT01771640, NCT02290886 and NCT02987413).

Finally, MSCs are being tested in clinical trials in other NS disorders, such as Shy-Drager syndrome, Werdnig-Hoffman disease, Huntington’s chorea and Alzheimer’s disease (Table 2). Regarding Alzheimer’s disease, the use of stem cells can be a hope. However, although some clinical studies support the safety and efficacy of this therapy, there is no unifying hypothesis for an underlying mechanism of action. The presence of neurotrophic factors, the activation of immunomodulatory molecules and the increase in the expression of synaptic proteins have been implicated (Bali et al., 2017). An ongoing phase II clinical trial with autologous AD-MSCs administered intravenously did not show adverse effects after 3 years (NCT03117738). Similar results have been found in other clinical trials (NCT02054208, NCT01547689).

In conclusion, different methods supporting and stimulating endogenous neurogenesis have shown significant beneficial effects on brain regeneration, e.g., improving functions lost by injury or disease. However, it seems that the efficiency of endogenous neurogenesis supported by extrinsic stimuli is not sufficient for the regeneration of large brain deficits.


The best pre-clinical results regarding the use of stem cells to treat nervous system diseases have been obtained with an early administration of cells following neuronal injury, aiming to inhibit the initial inflammatory response and to activate the immune cells. There is little evidence supporting significant benefits when cells are administered after one week (Woodcock and Morganti-Kossmann, 2013). Currently, the clinical usage of autologous MSCs is limited, mainly due to the difficulty of generating large amounts of cells to treat the patient in a short period of time. The high economic cost also constitutes a significant hindrance, especially when it comes to generating, processing and storing stem and progenitor cells before administering them to the patient. Other technical aspects that are worth considering before employing MSCs in the clinic include (Clement et al., 2017): i) difficulty of standardizing isolation protocols; ii) MSCs heterogeneicity, which affects their in vitro expansion; iii) long-term expansion of a limited number of clones with loss of multipotency; iv) choice of the route of administration, which can alter the distribution or localization of MSCs in the damaged tissue; v) dose and time of patient’s follow-up; or vi) spontaneous transformation of MSCs in other cell types during the proliferative phase, including tumor cells. Although the main objective of these therapies is functional recovery, there are several unspecific effects that stem and progenitor cells can exert, like stabilization of the blood-brain barrier or brain edema in case of trauma. In order to ensure the safety and efficacy of the treatment, monitoring should be conducted by combining magnetic resonance imaging to show the brain injury and perfusion, the study of biological parameters such as systemic concentration of pro- and antiinflammatory cytokines, and neurological tests that allow a comprehensive assessment of the neurological state of the patient.

In neuronal lineage-differentiated cells, not only the genome must be preserved, but also the epigenetic pattern must be carefully considered in order to certify the identity of cells after differentiation so as to guarantee that the cell type used at the beginning of the research is the same as the one transplanted into the patient. Neuronal stem cells can turn into neuronal tumor cells due to epigenetic and genetic modifications, first transforming differentiated cells into more primitive ones, and finally into tumor cells (Achanta et al., 2010). However, using autologous cell sources diminishes the risk of malignant transformation. Further studies are required to elucidate the mechanisms underlying stem cell transformation, which will significantly contribute to regulate cell destination and oncogenesis inhibition.


It is worth noting that, in spite of promising results from a large number of pre-clinical and clinial trials, MSCs therapies still have significant limitations. It is necessary to isolate and culture homogeneous populations of MSCs, improve the differentiation efficiency and regeneration rate, establish an optimal transplantation methodology and ensure long-term biosecurity after transplantation. It is known that the process of neuronal differentiation is mostly controlled by changes in gene expression, and thus understanding the genetic behavior of MSCs during differentiation would help to create a more effective approach to cell therapy. To date, despite several methods to stimulate neurogenesis -with notable benefits for the patient- are known, their efficiency is not enough to repair the neuronal damage secondary to severe nervous system diseases. In order to restore the normal function of the damaged tissue, conventional therapeutic approaches may not be sufficient. In this regard, combining tissue engineering, pharmacology and classic rehabilitation could be the most promising strategy. Moreover, understanding the regeneration mechanisms of the nervous tissue will allow to coordinate and improve these therapies. New in vivo and in vitro studies are needed to identify the molecular interactions between the cell graft and the host, eventually leading to a better translation to the clinic from a responsible and accesible perspective.


The authors declare no conflict of interest.

Fig. 1. Schematic process of the in vitro differentiation of mesenchymal stem cells (MSCs). Differentiation factors as drugs, small molecules, the enrichment of culture media and epigenetics changes (A) make different effects on MSC like increase reactive astrocytosis, synaptogenesis, neurogenesis, myelination, apoptosis inhibition and angiogenesis. In addition, inhibition apoptosis and inflamation are also induced. MSC may be applied to promote remyelination (i.e., multiple sclerosis) where the presence of MSC marks the sites where the oligodendrocyte progenitor cell (OPC) has to join to repair the lost myelin (B). Moreover, MSCs may be used to induce restitution of injured areas and damaged circuitry of the brain after stroke (C). Finally, therapeutic application of MSCs may represent a promising approach in the treatment of spinal cord injury (D).

In vitro neuronal differentiation of MSC. Substances commonly used for neural differentiation and neuronal markers more frequently studied after the differentiation process

CompoundsNeuronal markersTypes of MSCRef.
EGFCHAT, TH, TUB-III, MAP2AD-MSCMarei et al., 2018
InsulinGFAP, TUB-IIIAD-MSCYing et al., 2012
5-AzacytineMAP2AD-MSCZemel’ko et al., 2013
bFGFGFAP, MAP2, MBP, nestinUCSCRafieemehr et al., 2015
NGFTUB-III, NF-M, PSD-95UCSCJahan et al., 2017
SHHHb-9, Pax-6, NF, CHATUCSCYousef et al., 2017
cAMPTUB-III, NSE, MAP2, GFAPUCSCShahbazi et al., 2016
BDNFNestin, NSE, GFAPBM-MSCLiu et al., 2015
DMSONSE, GFAPBM-MSCXu et al., 2016
Retinoic acidNFBM-MSCWang et al., 2013
BMENestin, NSEBM-MSCShi et al., 2016
IBMXTUB-III, GFAP, NF, NeuN, MAP2BM-MSC / eMSCZemel’ko et al., 2014
BHAMAP2, NSE, GFAPBM-MSCMu et al., 2015
LIFNestin, TUB-III, GFAP, MBP, THhDPSCChun et al., 2016

AD-MSC, adipose-derived mesenchymal stem cells; BDNF, brain-derived neurotrophic factor; bFGF, basic fibroblast growth factor; BHA, butylated hydroxyanisole; BM-MSC, bone marrow-derived mesenchymal stem cells; BME, 2-mercaptoethanol; CHAT, choline O-acetyltransferase; DMSO, dimethyl sulfoxide; EGF, epidermal growth factor; eMSC, menstrual blood mesenchymal stem cells; GFAP, glial fibrillary acidic protein; Hb-9, homeobox gene 9; hDPSC, human dental pulp stem cells; IBMX, 3-isobutyl-1-methylxanthine; LIF, leukemia inhibitory factor; MAP2, microtubule-associated protein 2; MBP, myelin basic protein; MSC, mesenchymal stem cells; NCC, neural crest cells; NF, neurofilament; NGF, nerve growth factor; NSE, neuron-specific enolase; Pax-6, paired box protein 6; PSD-95, postsynaptic density protein 95; SHH, sonic hedgehog; TH, tyrosine hydroxylase; TUB-III, ß-tubulin III; UCSC, umbilical cord blood stem cells.

Clinical trials using MSCs for neural disorders

Identifier/CountryStudyPhase/PatientsYearSafety and effectivenessDisease
NCT02742857/IndiaIntrathecal transplantation of bioactive peptides, MSC and transcranial laser stimulation1/202017OngoingTraumatic brain injury
NCT02525432/USAIntravenous transplantation of autologous BM-MSC2/552017OngoingTraumatic brain injury
NCT00875654/FranceIntravenous injection of autologous BM-MSC2/312017OngoingStroke
NCT01287936/USATransplantation of modified SB623 stem cells into ischemic, chronic and stable cerebrovascular accident1–2/182016Cells safe Improvement after 12 monthsStroke
NCT01310114/USAIntravenous administration of placenta-derived cells2/442018OngoingIschemic stroke
NCT03356821/HollandIntranasal transplantation of BM-MSC in perinatal1–2/102017OngoingArterial infarction
NCT01678534/SpainTransplantation of allogeneic AD-MSC2/202017OngoingIschemic stroke
NCT01468064/ChinaTransplantation of autologous BM-MSC and endothelial progenitors1–2/202017OngoingIschemic stroke
NCT01922908/USATransplantation of autologous BM-MSC1–2/482017OngoingIschemic stroke
NCT03371329/USATransplantation of BM-MSC1/122017OngoingIntracerebral hemorrhage
NCT02580019/ChinaTransplantation of HU-MSC2/22017OngoingIschemic stroke
NCT02378974 South KoreaIntravenous transplantation of HU-MSC1–2/182017OngoingIschemic stroke
NCT03176498/ChinaIntravenous transplant of HU-MSC1–2/402017OngoingIschemic stroke (convalescence)
NCT03186456/ChinaTransplantation of HU-MSC1/402017OngoingIschemic stroke
NCT01716481/South KoreaIntravenous transplantation of autologous MSC expanded with autologous serum3/602017OngoingStroke
NCT01297413/USATransplantation of allogeneic BM-MSC1–2/382017OngoingIschemic stroke
NCT02849613/FranceIntravenous transplantation of allogeneic ADSC2–3/4002016OngoingStroke
NCT02165904/SpainSubarachnoid transfer of autologous BM-MSC2/102017No secondary effects (1 year) Functional improvementsSpinal cord injury
NCT02481440/ChinaTransplantation of allogeneic umbilical cord-derived MSC1–2/442018OngoingSpinal cord injury
NCT01676441/South KoreaAutologous MSC transplantation2–3/322016OngoingSpinal cord injury
NCT02574585/BrazilTransfer of autologous BM-MSC2/402017OngoingSpinal cord (lumbar) injury
NCT02574572/BrazilTransfer of autologous BM-MSC1/102018OngoingSpinal cord (cervical) injury
NCT02152657/BrazilTransfer of autologous MSC in spinal cord injuries by percutaneous puncture5/12017No publication availableSpinal cord injury
NCT02482194/PakistanIntrathecal transfer of autologous BM-MSC1/92016No secondary effects (2 years)Spinal cord injury
NCT02688049/ChinaCombined treatment of MSC and NeuroRegen scaffold1–2/302017OngoingSpinal cord injury
NCT02570932/SpainIntrathecal transfer of autologous BM-MSC2/102017OngoingSpinal cord injury
NCT01769872/South KoreaAD-MSC transplantation1–2/152016No publication availableSpinal cord injury
NCT03003364 SpainIntrathecal transfer of autologous WJ-MSC1–2/102017No publication availableSpinal cord injury
NCT02352077/ChinaTransplantation of BM-MSC and NeuroRegen scaffold1/302016No secondary effects (1 year)
Small sensorial improvements
Spinal cord injury
NCT02981576 JordanComparison of AD- and BM-MSC transplantation1–2/142017OngoingSpinal cord injury
NCT02917291/SpainTransplantation of allogenic AD-MSC combined with H2O2 and HC016 cells1–2/462017OngoingSpinal cord injury
NCT03308565/USAAD-MSC transplantation in cerebrospinal fluid1/102017OngoingSpinal cord injury
NCT01909154/SpainTransfer of autologous BM-MSC1/122017No secondary effects
Small sensorial improvements
Spinal cord injury
NCT01393977/ChinaDifferences between rehabilitation and transplantation2/602017No publication availableSpinal cord injury
NCT02881489/PolandTransplantation of autologous BM-MSC1/302017OngoingSpinal cord injury
NCT01873547/ChinaDifferences between rehabilitation and transplantation3/3002018No publication availableSpinal cord injury
NCT01325103/BrazilTransplantation of autologous BM-MSC1/202017No secondary effects
Neurological improvements
Spinal cord injury
NCT01377870/IranEvaluation of the autologous MSC transplantation in multiple sclerosis1–2/302018No publication availableMultiple sclerosis
NCT01895439/JordanIntrathecal administration of autologous BM-MSC1–2/302017No adverse secondary effects
General improvement
Multiple sclerosis
NCT00813969/USAAutologous MSC transplantation1/242016No publication availableMultiple sclerosis
NCT01933802/USAIntrathecal administration of autologous MSC1/202018Minor secondary effects (24 hours)
Improvements in muscular strength and bladder
Multiple sclerosis
NCT01606215/United KingdomTransplantation of MSC1–2/132016No publication availableMultiple sclerosis
NCT01745783/SpainIntravenous transplantation of autologous BM-MSC1–2/302018No publication availableMultiple sclerosis
NCT02611167/USAIntravenous transplantation of allogeneic BM-MSC1–2/202018OngoingParkinson
NCT01609283/USAIntrathecal transplantation of autologous MSC1/272018OngoingALS
NCT01759797/IranIntravenous transplantation of autologous MSC1/62016No secondary effectsALS
NCT02492516/IranIntravenous transplantation of autologous AD-MSC1/192016No publication availableALS
NCT02987413/BrazilIntrathecal transplantation of autologous MSC1/32017No secondary effects (1year)ALS
NCT01771640/IranIntrathecal transplantation of autologous MSC1/82018No secondary effects (6 months)ALS
NCT02917681/BrazilIntrathecal transplantation of autologous MSC1–2/282016No secondary effects (10 months)ALS
NCT02290886/SpainIntravenous transplantation of AD-MSC1–2/402018No secondary effects (10 months)ALS
NCT03268603/USATransplantation of autologous AD-MSC2/602018OngoingALS
NCT03280056/USAIntrathecal transplantation of autologous BM-MSC3/2002018OngoingALS
NCT03296501 PolandIntraspinal transplantation of AD-MSC1/302017OngoingALS
NCT01777646/IsraelTransplantation of autologous BM-MSC secreting neurotrophic factors2/142018No secondary effects (10 months)ALS
NCT02600130/USAIntravenous transplantation of MSC versus placebo1/302018OngoingAlzheimer
NCT02833792/USATransplantation of allogeneic MSC2/402018OngoingAlzheimer
NCT02054208/South KoreaTransplantation of HU-MSC1–2/452017No secondary effects (2 years)Alzheimer
NCT01547689/ChinaTransplantation of HU-MSC1–2/302016No secondary effects (10 months)Alzheimer
NCT03117738/USAIntravenous transplantation of autologous AD-MSC1–2/602018No secondary effects (3 years)Alzheimer
NCT03172117/South KoreaTransplantation of HU-MSC1–2/452017OngoingAlzheimer
NCT02672306/ChinaTransplantation of HU-MSC1–2/402018OngoingAlzheimer
NCT02899091/South KoreaIntravenous transplantation of MSC1–2/242016OngoingAlzheimer
NCT02315027/USAIntrathecal transplantation of autologous MSC1/302017No secondary effects (1 year)SDS-MSA
NCT00911365/South KoreaTransplantation of autologous MSC versus placebo2/272017No secondary effectsSDS-MSA
NCT03265444/South KoreaTransplantation of BM-MSC1/92018OngoingMSA
NCT02855112/IranTransplantation of allogeneic AD-MSC1–2/102017No secondary effectsSMA1
NCT02728115/BrazilIntravenous transplantation of autologous MSC1/62017OngoingHuntington’s chorea
NCT03252535/BrazilTransplantation of MSC2/352017OngoingHuntington’s chorea

AD-MSC, adipose tissue-derived mesenchymal stem cells; ALS, amyotrophic lateral sclerosis; BM-MSC, bone marrow-derived mesenchymal stem cells; HU-MSC, human umbilical mesenchymal stem cells; SDS-MSA, Shy-Drager syndrome (multiple system atrophy); SMA1, spinal muscular atrophy type 1 (Werdnig-Hoffman disease); WJ-MSC, Wharton’s jelly-derived mesenchymal stem cells.

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