Perivascular mesenchymal stem cells in the adult human brain: a future target for neuroregeneration?
© Özen et al.;licensee Springer. 2012
Received: 28 October 2012
Accepted: 20 November 2012
Published: 23 November 2012
Perivascular adult stem cells have been isolated from several tissues, including the adult human brain. They have unique signatures resembling both pericytes and mesenchymal stem cells. Understanding the nature of these cells in their specific vascular niches is important to determine their clinical potential as a new adult stem cell source. Indeed, they have promising features in vitro in terms of multipotency, immunomodulation and secretion of growth factors and cytokines. However, their in vivo function is less known as yet. Recent emerging data show a crucial role of perivascular mesenchymal stem cells in tissue homeostasis and repair. Furthermore, these cells may play an important role in adult stem cell niche regulation and in neurodegeneration. Here we review the recent literature on perivascular mesenchymal stem cells, discuss their different in vitro functions and highlight especially the specific properties of brain-derived perivascular mesenchymal stem cells. We summarize current evidence that suggests an important in vivo function of these cells in terms of their regenerative potential that may indicate a new target cell for endogenous tissue regeneration and repair.
KeywordsPericytes Mesenchymal stem cells Perivascular niche Neuroregeneration
Adult stem cells
Adult stem cells (ASCs) are found in almost all organs of the postnatal human body. They reside in the perivascular niche, a specific microenvironment that allows ASCs to retain their multi-lineage potential and self-renewal capacity[1, 2]. The perivascular niche consists of ASCs, neighbouring cells and extracellular matrix[1, 3, 4].
Adult stem cells are a source for organ-specific cell replacement either during the normal cell turnover or under pathological conditions[5, 6]. These stem cells often remain dormant until they are activated by the body’s need to maintain tissues, or in response to disease or tissue injury. Some ASC types, such as hematopoietic stem cells (HSCs) or enteric stem cells, have a high proliferation rate, whereas in other organs, ASCs only divide under certain conditions, stimulated by injury for example.
In contrast to embryonic stem cells, the differentiation potential of ASCs is regarded as more restricted, usually to the cells of the tissue in which they reside. This suggests that the differentiation of an ASC into a specialized cell might be dependent on the surrounding tissue. However, this classical paradigm of tissue-specific differentiation capacity has been challenged by observations of a different degree of plasticity in some adult tissues that has resulted in differentiation beyond tissue boundaries.
Mesenchymal stem cells
One ASC type that has specifically attracted attention during the past years are mesenchymal stem cells (MSCs)[7–12]. Friedenstein and co-workers were the first to describe MSCs, originally termed mesenchymal stromal cells, as a rare population of plastic-adherent cells that could be isolated from the bone marrow but was different from HSCs. Mesenchymal stem cells are isolated by adherence to plastic, possess a high proliferative potential and are characterized by the expression of a panel of surface markers and their capacity to differentiate along mesodermal lineages such as osteoblasts, chondrocytes and adipocytes. They have gained interest because they are not only multipotent, they also support hematopoiesis[16–18], are immunomodulatory[19–23] and have an intriguing pro-regenerative capacity due to the secretion of different growth factors and mitogens[12, 23].
Mesenchymal stem cells reside in the perivascular niche
Interestingly, sources for MSCs are not restricted to the bone marrow. Indeed, MSCs have been isolated from several tissues in different species[7, 10] but also from different human tissues and organs[24–26] including bone marrow, dental pulp[27, 28], adipose tissue, umbilical cord Wharton’s jelly, placenta and recently also from the adult human brain. Importantly, these MSCs are located in the perivascular niche and exhibit similarities to pericytes in terms of phenotype, gene expression and differentiation capacity[25, 26, 32].
Evidence, that MSCs and pericytes are biologically related had remained indirect for a long time, but a more systematic analysis of their association has only recently been made[25, 26, 33, 34]. Now it has been shown that MSCs may reside in the perivascular compartment and have characteristics identical to a subclass of pericytes[10, 24–26, 32, 34]. However, pericytes around capillaries are suggested not to be the only ancestors of MSC’s. Adventitial cells that reside around larger vessels also natively express MSC surface markers[35, 36].
Pericytes are a heterogeneous cell population in the vascular niche, that line the abluminal side of endothelial cells in the perivascular space and are embedded within a shared basement membrane[38, 39]. They span the entire microvasculature. The phenotypic identification of pericytes is rather difficult due to the lack of one specific pericyte marker. Therefore, besides their location, a panel of different markers is usually used to identify pericytes[38, 40–42].
This diversity in pericyte marker expression may be due to differences in tissue location, vessel size or embryonic origin. It is generally proposed that pericytes are either mesodermal or neural crest-derived[43, 44], depending on their location in any given organ. In addition to their multiple embryonic origins, pericytes may develop from several adult cell types[38, 42, 45]. In the resting stage, pericytes are quiescent slow-cycling cells. Once isolated from different tissues, pericytes have the capacity to proliferate and differentiate into different cell types in vitro.
Perivascular mesenchymal stem cells - a novel stem cell in the human brain
For many decades, the adult brain, in contrast to other tissues, was thought to not be capable of regeneration. However, it is now widely accepted that the adult human brain contains neural progenitors[47–53]. In the brain, adult neural stem cells are also found in specialized vascular niches, mainly in the neurogenic zones, the subventricular zone and the subgranular zone of the dentate gyrus[54–57]. In these vascular niches, the neural stem cells contact the vasculature at the sites that lack astrocyte endfeet and pericyte coverage.
Neural progenitor cells could also be derived from a variety of adult brain regions other than the known neurogenic zones[49, 52, 59, 60]. Human adult progenitor cells isolated from non-neurogenic regions multiply in vitro and give rise to cells with the characteristics of neurons, astrocytes, and oligodendrocytes[59, 61, 62].
Marker expression of perivascular MSC isolated from the adult human brain
Neural/ glial progenitor markers
Most interestingly, when isolated perivascular MSCs were exposed to glial induction medium, the cells differentiated into oligodendrocytes or astrocytes, pericyte-specific antigens were downregulated and cells expressed glial fibrillary acidic protein (GFAP).
Furthermore, upon neuronal induction, the same perivascular MSC clones downregulated mRNA for pericyte markers (α-SMA, Nestin, RGS5, NG2 and PDGFR-β) and upregulated mRNA for neuronal transcription factors (NeuroD1, Pax6, Tbr1, Tbr2) and neuronal markers (DCX, Tuj1) and consistently expressed neuron-specific proteins (DCX; HuC/D, Map2, Tuj1, NSE). A proportion of neurons expressed the synaptic marker PSD95 and GABA A-receptor, indicating a more mature neuronal phenotype. Cells exhibited typical electrophysiological features of immature neurons, consistent with the slow maturation of human neurons.
Thus, perivascular MSCs have a broader stem cell potential than classical neural stem cells. Moreover, perivascular MSCs are not restricted to a certain perivascular niche in neurogenic regions but could be easily isolated from non-neurogenic regions in the brain. Thus, the perivascular MSC is a novel, unique population distinct from the neural stem cells in the adult brain that has both neuroectodermal and mesodermal differentiation capacity in vitro. This differentiation capacity was retained in long-term proliferating cultures.
The most intriguing question to be answered now is obviously which role these cells play for disease and repair in vivo and whether this reflects their in vitro potential.
Regenerative potential of perivascular mesenchymal stem cells
Perivascular MSCs possess both MSC and pericyte features. Both cell types have been described to have different properties that may play a role in regeneration.
Mesenchymal stem cells in vitro have shown several interesting features such as multipotentiality, immunomodulation, and pro-regenerative capacities[9, 12, 15]. Due to these properties, MSCs have become one of the most promising ASC types and are currently being tested in several clinical trials. Indeed, MSCs are explored as a treatment for Crohn’s disease[67–70], for acute graft versus host reaction[71–73], myocardial infarct[74–76], limb ischemia[77, 78], osteogenesis imperfecta[79–81], and for neurological disorders such as stroke[82–84], cerebral palsy, amyotrophic lateral sclerosis[86, 87] and multiple sclerosis[88–91]. A current search gives a total of 298 clinical studies using different sources of MSCs and mesenchymal stromal cells (http://www.clinicaltrials.gov). In most of these clinical trials, MSCs are used in an autologous and allogenic ex vivo transplantation setting for repair.
Akin to MSCs, pericytes have been reported to be able to differentiate into osteoblasts[25, 63, 64], chondrocytes, adipocytes[25, 65, 66], muscle cells[25, 92], but also neuroectodermal lineages[32, 93].
It remains to be answered whether and to what extent these described in vitro properties reflect the in vivo function of perivascular MSCs as these properties might be altered upon isolation and culture in vitro.
Multipotentiality in vivo
In vivo multipotency of pericytes/perivascular MSC
Differentiated cell type
Chemical ablation in testis
Type A pericyte
Spinal cord injury
Genetic fate mapping
Genetic fate mapping
Follicular dendritic cell
They have been shown to have an inhibitory effect on lymphocytes[105, 106], on B-cells, dendritic cells and natural killer cells[109, 110]. Furthermore, MSCs modulate the inflammatory response of microglial cells, resident immunocompetent cells in the brain. Mesenchymal stem cells hereby inhibit the expression and release of inflammatory molecules and stress-associated proteins and change microglial cells from a detrimental to a more neuroprotective phenotype. Thus, these immunomodulatory features of MSCs may have an indirect neuroprotective effect. Mesenchymal stem cells lead to amelioration in multiple sclerosis through inhibition of the pathogenic immune response and the release of neuroprotective molecules. They have also been shown to suppress ischemia-induced inflammation. The neuroprotective effect of MSCs in stroke was also mediated via a change in resident microglia to a more neuroprotective type. Furthermore, in a model of Parkinson’s disease, dopaminergic cell death that was induced by activated microglia could be prevented by grafting MSCs. Similar results, demonstrating decreased activation of astrocytes and microglia by MSCs in a mouse model of multiple system atrophy have recently been reported[117, 118].
Similarly to MSCs, pericytes have been described to regulate T-cell activation, recruit T- and B-lymphocytes to areas of tissue injury[119, 120] and control transmigration of thymocytes from the thymus across the blood vessel wall. In addition, brain pericytes have been shown to secrete different cytokines in vitro.
Should these immunomodulatory features be present on resident perivascular MSCs in vivo, they could indeed play a primary role in inhibiting immunosurveillance and thereby establish a regenerative environment.
A third, and most important feature of isolated MSCs is their pro-regenerative capacity. Mesenchymal stem cells secrete a large number of cytokines, growth factors, mitogens and angiogenic factors[12, 95]. This raises the question of whether MSCs could also be promoting a regenerative environment by production of growth factors and cytokines in vivo.
The most interesting scientific question now is whether their in vivo perivascular counterparts hold similar properties mentioned above. It is conceivable that resident perivascular MSCs support the local ASC niche either directly by differentiating into tissue-specific cells as indicated above, or indirectly, by regulating the stem cell niche. Interestingly, pericytes have been shown to contribute to tissue repair and wound healing in vivo by substantially enhancing the tissue-regenerative capacity of human epidermal cells.
The HSC niche, where MSCs were first identified, is currently the best characterized example of an ASC niche in vivo function of resident MSC in the HSC niche was recently revealed by lineage-tracing using nestin as a marker for MSC. This data suggests that resident MSCs are responsible for the maintenance of the HSC niche by regulating the proliferation and survival of HSCs.
Do perivascular mesenchymal stem cells/pericytes play a role in brain repair?
Whether the properties and functions of perivascular MSCs vary between tissues or whether these cells are biologically equivalent will need to be systematically evaluated. The diversity of pericytes is largely unexplored, but there are indications that pericytes in the brain may have specific potential and functions[119, 123, 125–127]. The brain is one of the most vascularized organs and pericytes have a higher density in the brain, and the brain has a lower endothelial/pericyte ratio compared to other organs. Consistent with their higher density, pericytes appear to act as a key modulator of the neurovascular unit in the brain. Neurovascular pericytes regulate the blood brain barrier[123, 126], capillary flow, angiogenesis and immune responses[37, 39, 41, 129, 130]. Minor disturbances in the blood vessels can compromise neuronal performance because of the importance of the vasculature for neuronal homeostasis, delivery of oxygen and nutrients, removal of metabolic waste and preservation of the neuronal microenvironment. This is reflected in the fact that vascular damage in pericyte-deficient mice preceeds neuronal damage and neurodegeneration, suggesting that neurodegeneration may develop secondary to disturbances in cerebral vascular homeostasis. Thus, microvascular dysfunction due to pericyte degeneration may initiate neurodegenerative changes. Resident perivascular MSCs may thus regulate the local ASC niche. Another hypothesis could be that pericytes respond to injury by tissue-specific differentiation as evident from other organs (Table2). Pericytes have been shown to migrate in response to traumatic brain injury. Recent studies that have isolated brain pericytes indicate that the differentiation potential of brain-derived pericytes in vitro extends beyond the mesodermal lineage to the neuroectodermal lineage[32, 93]. This may at least partially reflect their inherent differentiation potential and could, in analogy to emerging studies in other tissues, possibly indicate their in vivo capacity.
However, the role that is played by these cells in brain development and repair remains most speculative and yet, represents one of the most fascinating questions to be raised. It now remains to be shown whether perivascular MSCs/pericytes resident in the brain have similar or equal functional characteristics in vivo, supporting the stem cell niche and controlling stem cell proliferation and differentiation. This could place resident perivascular MSCs in a crucial position for contributing to brain disease and regeneration, as much pathology has been associated with a dysregulation of the stem cell niche.
We believe that the properties of these cells observed in other tissues may also apply to the brain. Thus, from a therapeutic perspective, resident MSCs emerge as an extremely promising target or agent for tissue regeneration.
In a time when the world’s population is aging, the health burden of neurodegenerative diseases such as Alzheimer’s disease and Parkinson’s disease but also conditions such as stroke is constantly increasing. To manage the larger number of patients and the connected health costs, brain research will have to direct a sharp focus towards developing neurorestorative and neuroprotective treatments.
In the next few years, the focus will be on studying the in vivo function of the newly discovered perivascular stem cells in the brain. Evidence from in vitro work and in vivo observations in other tissues gives hope that these perivascular stem cells may play a key role for regeneration of the brain in response to trauma, injury or degeneration. The aim is to control and enhance any pro-regenerative capacities of these cells by delivering therapies targeted at stimulating the cells to relocate to sites of injury or damage.
To understand and harness the reparative potential of ASCs in the brain will be key in setting the course for future research on neurodegeneration and neurorestoration.
Adult Stem Cells
Mesenchymal Stem Cells
Hematopoietic Stem Cells
Endoglin cell membrane glycoprotein
Cluster differentiation marker
Platelet-Derived Growth Factor Receptor beta
Fluorescence-Activated Cell Sorting
Leukocyte common antigen
Ecto-5′-nucleotidase (NT5E). GPI-anchored purine enzyme expressed on the surface of human T and B lymphocytes
Thymocyte differentiation antigen 1 (Thy-1)
Vascular cell adhesion protein 1 (VCAM-1)
Alpha subunit of integrin alpha4beta1
Regulator of G-protein Signaling 5
Alpha Smooth Muscle Actin
Chondroitin Sulfate Proteoglycan
Sox gene 1
Paired box protein 6
Glial Fibrillary Acidic Protein
T-box brain 1 transcription factor
T-box brain 2 transcription factor
Neuronal class III beta-tubulin
Anti human neuronal protein HuC/D
Microtubule-associated protein 2
Postsynaptic Density Protein 95
Potassium channel subunit
S100 calcium-binding protein
Single chain transmembrane glycoprotein selectively expressed on human lymphoid and myeloid hematopoietic progenitors cells
Activated leukocyte cell adhesion molecule
Neural cell adhesion molecule (N-CAM)
Cluster of differentiation 14, cell surface receptor and differentiation marker
Macrophage antigen 1 (Mac-1)
Mesenchymal/stromal stem cell marker 1
Peroxisome proliferator-activated receptor gamma
Forkhead box transcription factor 1.
We thank Alexandra Maria Lee for help with proofreading the manuscript and Edward Visse for assistance with drawing Figure 1.
Our work is supported by the Swedish Medical Research Council, the Anérs Foundation, and J.B. is supported by a grant from the European Union (FP7).
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