Neural stem cell
|Neural stem cell|
Neural progenitor cells (green) in the rat olfactory bulb
|Latin||Cellula nervosa praecursoria|
Neural stem cells (NSCs) are self-renewing, multipotent cells that generate the main phenotype of the nervous system. Stem cells are characterized by their capability to differentiate into multiple cell types via exogenous stimuli from their environment. They undergo asymmetric cell division into two daughter cells, one non-specialized and one specialized. NSCs primarily differentiate into neurons, astrocytes, and oligodendrocytes.
- 1 History
- 2 Aging and development
- 3 Functions during differentiation and disease
- 4 Potential clinical applications
- 5 Basic laboratory studies
- 6 Assays
- 7 Neural Stem Cell Institute
- 8 See also
- 9 References
In 1989, Sally Temple described multipotent, self-renewing progenitor and stem cells in the subventricular zone (SVZ) of the mouse brain. In 1992, Brent A. Reynolds and Samuel Weiss were the first to isolate neural progenitor and stem cells from the adult striatal tissue, including the SVZ — one of the neurogenic areas — of adult mice brain tissue. In the same year the team of Constance Cepko and Evan Y. Snyder were the first to isolate multipotent cells from the mouse cerebellum and stably transfected them with the oncogene v-myc. Interestingly, this molecule is one of the genes widely used now to reprogram adult non-stem cells into pluripotent stem cells. Since then, neural progenitor and stem cells have been isolated from various areas of the adult brain, including non-neurogenic areas, such as the spinal cord, and from various species including humans.
Aging and development
In vivo origin
There are two basic types of stem cell: adult stem cells, which are limited in their ability to differentiate, and embryonic stem cells (ESCs), which are pluripotent. ESCs are not limited to a particular cell fate; rather they have the capability to differentiate into any cell type. ESCs are derived from the inner cell mass of the blastocyst with the potential to self-replicate.
NSCs are considered adult stem cells because they are limited in their capability to differentiate. NSCs are generated throughout an adult's life via the process of neurogenesis. Since neurons do not divide within the central nervous system (CNS), NSCs can be differentiated to replace lost or injured neurons or in many cases even glial cells. NSCs are differentiated into new neurons within the SVZ of lateral ventricles, a remnant of the embryonic germinal neuroepithelium, as well as the dentate gyrus of the hippocampus.
In vitro origin
Adult NSCs were first isolated from mouse striatum in the early 1990s. They are capable of forming multipotent neurospheres when cultured in vitro. Neurospheres can produce self-renewing and proliferating specialized cells. These neurospheres can differentiate to form the specified neurons, glial cells, and oligodendrocytes. In previous studies, cultured neurospheres have been transplanted into the brains of immunodeficient neonatal mice and have shown engraftment, proliferation, and neural differentiation.
Communication and migration
NSCs are stimulated to begin differentiation via exogenous cues from the microenvironment, or stem cell niche. This capability of the NSCs to replace lost or damaged neural cells is called neurogenesis. Some neural cells are migrated from the SVZ along the rostral migratory stream which contains a marrow-like structure with ependymal cells and astrocytes when stimulated. The ependymal cells and astrocytes form glial tubes used by migrating neuroblasts. The astrocytes in the tubes provide support for the migrating cells as well as insulation from electrical and chemical signals released from surrounding cells. The astrocytes are the primary precursors for rapid cell amplification. The neuroblasts form tight chains and migrate towards the specified site of cell damage to repair or replace neural cells. One example is a neuroblast migrating towards the olfactory bulb to differentiate into periglomercular or granule neurons which have a radial migration pattern rather than a tangential one.
On the other hand, the dentate gyrus neural stem cells produce excitatory granule neurons which are involved in learning and memory. One example of learning and memory is pattern separation, a cognitive process used to distinguish similar inputs.
Neural stem cell proliferation declines as a consequence of aging. Various approaches have been taken to counteract this age-related decline. Because FOXO proteins regulate neural stem cell homeostasis, FOXO proteins have been used to protect neural stem cells by inhibiting Wnt signaling.
Functions during differentiation and disease
Epidermal growth factor (EGF) and fibroblast growth factor (FGF) are mitogens that promote neural progenitor and stem cell growth in vitro, though other factors synthesized by the neural progenitor and stem cell populations are also required for optimal growth. It is hypothesized that neurogenesis in the adult brain originates from NSCs. The origin and identity of NSCs in the adult brain remain to be defined.
The most widely accepted model of an adult NSC is a radial, astrocytes-like, GFAP-positive cell. Quiescent stem cells are Type B that are able to remain in the quiescent state due to the renewable tissue provided by the specific niches composed of blood vessels, astrocytes, microglia, ependymal cells, and extracellular matrix present within the brain. These niches provide nourishment, structural support, and protection for the stem cells until they are activated by external stimuli. Once activated, the Type B cells develop into Type C cells, active proliferating intermediate cells, which then divide into neuroblasts consisting of Type A cells. The undifferentiated neuroblasts form chains that migrate and develop into mature neurons. In the olfactory bulb, they mature into GABAergic granule neurons, while in the hippocampus they mature into dentate granule cells.
NSCs have an important role during development producing the enormous diversity of neurons, astrocytes and oligodendrocytes in the developing CNS. They also have important role in adult animals, for instance in learning and hippocampal plasticity in the adult mice in addition to supplying neurons to the olfactory bulb in mice.
Notably the role of NSCs during diseases is now being elucidated by several research groups around the world. The responses during stroke, multiple sclerosis, and Parkinson's disease in animal models and humans is part of the current investigation. The results of this ongoing investigation may have future applications to treat human neurological diseases.
Neural stem cells have been shown to engage in migration and replacement of dying neurons in classical experiments performed by Sanjay Magavi and Jeffrey Macklis. Using a laser-induced damage of cortical layers, Magavi showed that SVZ neural progenitors expressing Doublecortin, a critical molecule for migration of neuroblasts, migrated long distances to the area of damage and differentiated into mature neurons expressing NeuN marker. In addition Masato Nakafuku's group from Japan showed for the first time the role of hippocampal stem cells during stroke in mice. These results demonstrated that NSCs can engage in the adult brain as a result of injury. Furthermore, in 2004 Evan Y. Snyder's group showed that NSCs migrate to brain tumors in a directed fashion. Jaime Imitola, M.D and colleagues from Harvard demonstrated for the first time, a molecular mechanism for the responses of NSCs to injury. They showed that chemokines released during injury such as SDF-1a were responsible for the directed migration of human and mouse NSCs to areas of injury in mice. Since then other molecules have been found to participate in the responses of NSCs to injury. All these results have been widely reproduced and expanded by other investigators joining the classical work of Richard L. Sidman in autoradiography to visualize neurogenesis during development, and neurogenesis in the adult by Joseph Altman in the 1960s, as evidence of the responses of adult NSCs activities and neurogenesis during homeostasis and injury.
The search for additional mechanisms that operate in the injury environment and how they influence the responses of NSCs during acute and chronic disease is matter of intense research.
Potential clinical applications
Regenerative therapy of the CNS
Cell death is a characteristic of acute CNS disorders as well as neurodegenerative disease. The loss of cells is amplified by the lack of regenerative abilities for cell replacement and repair in the CNS. One way to circumvent this is to use cell replacement therapy via regenerative NSCs. NSCs can be cultured in vitro as neurospheres. These neurospheres are composed of neural stem cells and progenitors (NSPCs) with growth factors such as EGF and FGF. The withdrawal of these growth factors activate differentiation into neurons, astrocytes, or oligodendrocytes which can be transplanted within the brain at the site of injury. The benefits of this therapeutic approach have been examined in Parkinson's disease, Huntington's disease, and multiple sclerosis. NSPCs induce neural repair via intrinsic properties of neuroprotection and immunomodulation. Some possible routes of transplantation include intracerebral transplantation and xenotransplantation.
An alternative therapeutic approach to the transplantation of NSPCs is the pharmacological activation of endogenous NSPCs (eNSPCs). Activated eNSPCs produce neurotrophic factors,several treatments that activate a pathway that involves the phosphorylation of STAT3 on the serine residue and subsequent elevation of Hes3 expression (STAT3-Ser/Hes3 Signaling Axis) oppose neuronal death and disease progression in models of neurological disorder.
Basic laboratory studies
Generation of 3D in vitro models of the human CNS
Human midbrain-derived neural progenitor cells (hmNPCs) have the ability to differentiate down multiple neural cell lineages that lead to neurospheres as well as multiple neural phenotypes. The hmNPC can be used to develop a 3D in vitro model of the human CNS. There are two ways to culture the hmNPCs, the adherent monolayer and the neurosphere culture systems. The neurosphere culture system has previously been used to isolate and expand CNS stem cells by its ability to aggregate and proliferate hmNPCs under serum-free media conditions as well as with the presence of epidermal growth factor (EGF) and fibroblast growth factor-2 (FGF2). Initially, the hmNPCs were isolated and expanded before performing a 2D differentiation which was used to produce a single-cell suspension. This single-cell suspension helped achieve a homogenous 3D structure of uniform aggregate size. The 3D aggregation formed neurospheres which was used to form an in vitro 3D CNS model.
Bioactive scaffolds as traumatic brain injury treatment
Traumatic brain injury (TBI) can deform the brain tissue, leading to necrosis primary damage which can then cascade and activate secondary damage such as excitotoxicity, inflammation, ischemia, and the breakdown of the blood-brain-barrier. Damage can escalate and eventually lead to apoptosis or cell death. Current treatments focus on preventing further damage by stabilizing bleeding, decreasing intracranial pressure and inflammation, and inhibiting pro-apoptoic cascades. In order to repair TBI damage, an upcoming therapeutic option involves the use of NSCs derived from the embryonic peri-ventricular region. Stem cells can be cultured in a favorable 3-dimensional, low cytotoxic environment, a hydrogel, that will increase NSC survival when injected into TBI patients. The intracerebrally injected, primed NSCs were seen to migrate to damaged tissue and differentiate into oligodendrocytes or neuronal cells that secreted neuroprotective factors.
Galectin-1 in neural stem cells
Galectin-1 is expressed in adult NSCs and has been shown to have a physiological role in the treatment of neurological disorders in animal models. There are two approaches to using NSCs as a therapeutic treatment: (1) stimulate intrinsic NSCs to promote proliferation in order to replace injured tissue, and (2) transplant NSCs into the damaged brain area in order to allow the NSCs to restore the tissue. Lentivirus vectors were used to infect human NSCs (hNSCs) with Galectin-1 which were later transplanted into the damaged tissue. The hGal-1-hNSCs induced better and faster brain recovery of the injured tissue as well as a reduction in motor and sensory deficits as compared to only hNSC transplantation.
Neural stem cells are routinely studied in vitro using a method referred to as the Neurosphere Assay (or Neurosphere culture system), first developed by Reynolds and Weiss. Neurospheres are intrinsically heterogeneous cellular entities almost entirely formed by a small fraction (1 to 5%) of slowly dividing neural stem cells and by their progeny, a population of fast-dividing nestin-positive progenitor cells. The total number of these progenitors determines the size of a neurosphere and, as a result, disparities in sphere size within different neurosphere populations may reflect alterations in the proliferation, survival and/or differentiation status of their neural progenitors. Indeed, it has been reported that loss of β1-integrin in a neurosphere culture does not significantly affect the capacity of β1-integrin deficient stem cells to form new neurospheres, but it influences the size of the neurosphere: β1-integrin deficient neurospheres were overall smaller due to increased cell death and reduced proliferation.
While the Neurosphere Assay has been the method of choice for isolation, expansion and even the enumeration of neural stem and progenitor cells, several recent publications have highlighted some of the limitations of the neurosphere culture system as a method for determining neural stem cell frequencies. In collaboration with Reynolds, STEMCELL Technologies has developed a collagen-based assay, called the Neural Colony-Forming Cell (NCFC) Assay, for the quantification of neural stem cells. Importantly, this assay allows discrimination between neural stem and progenitor cells.
Neural Stem Cell Institute
The damaged CNS tissue has very limited regenerative and repair capacity so that loss of neurological function is often chronic and progressive. Cell replacement from stem cells is being actively pursued as a therapeutic option. In 2009, a research institute dedicated solely to translating neural stem research into therapies for patients was created outside of Albany, New York, The Neural Stem Cell Institute.
- J Cancer Res Ther. 2011 Jan-Mar;7(1):58-63. doi:10.4103/0973-1482.80463
Intensity-modulated radiation to spare neural stem cells in brain tumors: a computational platform for evaluation of physical and biological dose metrics. Jaganathan A, Tiwari M, Phansekar R, Panta R, Huilgol N.
- Clarke, D.; Johansson, C; Wilbertz, J; Veress, B; Nilsson, E; Karlstrom, H; Lendahl, U; Frisen, J (2000). "Generalized Potential of Adult Neural Stem Cells.". Science. 288 (5471): 1660–63. Bibcode:2000Sci...288.1660C. doi:10.1126/science.288.5471.1660. PMID 10834848.
- Alenzi, F; Bahkali, A (2011). "Stem cells: Biology and clinical potential". African Journal of Biotechnology. 10 (86): 19929–40. doi:10.5897/ajbx11.046.
- Temple, S (1989). "Division and differentiation of isolated CNS blast cells in microculture". Nature. 340 (6233): 471–73. Bibcode:1989Natur.340..471T. doi:10.1038/340471a0.
- Reynolds, B.; Weiss, S (1992). "Generation of neurons and astrocytes from isolated cells of the adult mammalian central nervous system". Science. 255 (5052): 1707–10. Bibcode:1992Sci...255.1707R. doi:10.1126/science.1553558. PMID 1553558.
- Snyder, Evan Y.; Deitcher, David L.; Walsh, Christopher; Arnold-Aldea, Susan; Hartwieg, Erika A.; Cepko, Constance L. (1992). "Multipotent neural cell lines can engraft and participate in development of mouse cerebellum". Cell. 68 (1): 33–51. doi:10.1016/0092-8674(92)90204-P. PMID 1732063.
- Zigova, Tanja; Sanberg, Paul R.; Sanchez-Ramos, Juan Raymond, eds. (2002). Neural stem cells: methods and protocols. Humana Press. ISBN 978-0-89603-964-3. Retrieved 18 April 2010.[page needed]
- Taupin, Philippe; Gage, Fred H. (2002). "Adult neurogenesis and neural stem cells of the central nervous system in mammals". Journal of Neuroscience Research. 69 (6): 745–9. doi:10.1002/jnr.10378. PMID 12205667.
- Paspala, S; Murthy, T; Mahaboob, V; Habeeb, M (2011). "Pluripotent stem cells – A review of the current status in neural regeneration". Neurology India. 59 (4): 558–65. doi:10.4103/0028-3886.84338. PMID 21891934.
- Sakaguchi, M; Okano, H (2012). "Neural stem cells, adult neurogenesis, and galectin-1: From bench to bedside". Developmental Neurobiology. 72 (7): 1059–67. doi:10.1002/dneu.22023. PMID 22488739.
- Kuhn HG, Dickinson-Anson H, Gage FH (1996). "Neurogenesis in the dentate gyrus of the adult rat: age-related decrease of neuronal progenitor proliferation" (PDF). Journal of Neuroscience. 16 (6): 2027–2033. PMID 8604047.
- Artegiani B, Calegari F; Calegari (2012). "Age-related cognitive decline: can neural stem cells help us?". Aging. 4 (3): 176–186. doi:10.18632/aging.100446. PMC . PMID 22466406.
- Renault VM, Rafalski VA, Morgan AA, Salih DA, Brett JO, Webb AE, Villeda SA, Thekkat PU, Guillerey C, Denko NC, Palmer TD, Butte AJ, Brunet A (2009). "FoxO3 regulates neural stem cell homeostasis". Cell Stem Cell. 5 (5): 527–539. doi:10.1016/j.stem.2009.09.014. PMC . PMID 19896443.
- Paik JH, Ding Z, Narurkar R, Ramkissoon S, Muller F, Kamoun WS, Chae SS, Zheng H, Ying H, Mahoney J, Hiller D, Jiang S, Protopopov A, Wong WH, Chin L, Ligon KL, DePinho RA (2009). "FoxOs cooperatively regulate diverse pathways governing neural stem cell homeostasis". CELL: Stem Cell. 5 (5): 540–553. doi:10.1016/j.stem.2009.09.013. PMC . PMID 19896444.
- Taupin, Philippe; Ray, Jasodhara; Fischer, Wolfgang H; Suhr, Steven T; Hakansson, Katarina; Grubb, Anders; Gage, Fred H (2000). "FGF-2-Responsive Neural Stem Cell Proliferation Requires CCg, a Novel Autocrine/Paracrine Cofactor". Neuron. 28 (2): 385–97. doi:10.1016/S0896-6273(00)00119-7. PMID 11144350.
- Bergstrom, T; Forsbery-Nilsson, K (2012). "Neural stem cells: Brain building blocks and beyond". Upsala Journal of Medical Sciences. 117 (2): 132–42. doi:10.3109/03009734.2012.665096. PMC . PMID 22512245.
- MacKlis, Jeffrey D.; Magavi, Sanjay S.; Leavitt, Blair R. (2000). "Induction of neurogenesis in the neocortex of adult mice". Nature. 405 (6789): 951–5. doi:10.1038/35016083. PMID 10879536.
- Nakatomi, Hirofumi; Kuriu, Toshihiko; Okabe, Shigeo; Yamamoto, Shin-Ichi; Hatano, Osamu; Kawahara, Nobutaka; Tamura, Akira; Kirino, Takaaki; Nakafuku, Masato (2002). "Regeneration of Hippocampal Pyramidal Neurons after Ischemic Brain Injury by Recruitment of Endogenous Neural Progenitors". Cell. 110 (4): 429–41. doi:10.1016/S0092-8674(02)00862-0. PMID 12202033.
- Imitola J, Raddassi K, Park KI, Mueller FJ, Nieto M, Teng YD, Frenkel D, Li J, Sidman RL, Walsh CA, Snyder EY, Khoury SJ (December 28, 2004). "Directed migration of neural stem cells to sites of CNS injury by the stromal cell-derived factor 1alpha/CXC chemokine receptor 4 pathway". Proc. Natl. Acad. Sci. U.S.A. 101 (52): 18117–22. Bibcode:2004PNAS..10118117I. doi:10.1073/pnas.0408258102. PMC . PMID 15608062.
- Sohur US, US.; Emsley JG; Mitchell BD; Macklis JD. (September 29, 2006). "Adult neurogenesis and cellular brain repair with neural progenitors, precursors and stem cells". Philosophical Transactions of the Royal Society of London B. 361 (1473): 1477–97. doi:10.1098/rstb.2006.1887. PMC . PMID 16939970.
- Bonnamain, V; Neveu, I; Naveilhan, P (2012). "Neural stem/progenitor cells as promising candidates for regenerative therapy of the central nervous system". Frontiers in Cellular Neuroscience. 6. doi:10.3389/fncel.2012.00017.
- Xu, X; Warrington, A; Bieber, A; Rodriguez, M (2012). "Enhancing Central Nervous System Repair-The Challenges". CNS Drugs. 25 (7): 555–73. doi:10.2165/11587830-000000000-00000. PMC . PMID 21699269.
- Androutsellis-Theotokis A, et al. (August 2006). "Notch signalling regulates stem cell numbers in vitro and in vivo". Nature. 442 (7104): 823–6. Bibcode:2006Natur.442..823A. doi:10.1038/nature04940. PMID 16799564.
- Androutsellis-Theotokis A, et al. (August 2009). "Targeting neural precursors in the adult brain rescues injured dopamine neurons". Proc. Natl. Acad. Sci. U.S.A. 106 (32): 13570–5. Bibcode:2009PNAS..10613570A. doi:10.1073/pnas.0905125106. PMC . PMID 19628689.
- Brito, C; Simao, D; Costa, I; Malpique, R; Pereira, C; Fernandes, P; Serra, M; Schwarz, S; Schwarz, J; Kremer, E; Alves, P (2012). "Generation and genetic modification of 3D cultures of human dopaminergic neurons derived from neural progenitor cells". Methods. 56 (3): 452–60. doi:10.1016/j.ymeth.2012.03.005. PMID 22433395.
- Stabenfeldt, S; Irons, H; LaPlace, M (2011). "Stem Cells and Bioactive Scaffolds as a Treatment for Traumatic Brain Injury". Current Stem Cell Research & Therapy. 6 (3): 208–20. doi:10.2174/157488811796575396.
- Ratajczak, J; Zuba-Surma, E; Paczkowska, K; Kucia, M; Nowacki, P; Ratajczak, MZ (2011). "Stem cells for neural regeneration--a potential application of very small embryonic-like stem cells". J. Physiol. Pharmacol. 62 (1): 3–12. PMID 21451204.
- Campos, L. S.; Leone, DP; Relvas, JB; Brakebusch, C; Fässler, R; Suter, U; Ffrench-Constant, C (2004). "β1 integrins activate a MAPK signalling pathway in neural stem cells that contributes to their maintenance". Development. 131 (14): 3433–44. doi:10.1242/dev.01199. PMID 15226259.
- Lobo, M. V. T.; Alonso, F. J. M.; Redondo, C.; Lopez-Toledano, M. A.; Caso, E.; Herranz, A. S.; Paino, C. L.; Reimers, D.; Bazan, E. (2003). "Cellular Characterization of Epidermal Growth Factor-expanded Free-floating Neurospheres". Journal of Histochemistry & Cytochemistry. 51 (1): 89–103. doi:10.1177/002215540305100111. PMID 12502758.
- Leone, D. P.; Relvas, JB; Campos, LS; Hemmi, S; Brakebusch, C; Fässler, R; Ffrench-Constant, C; Suter, U (2005). "Regulation of neural progenitor proliferation and survival by β1 integrins". Journal of Cell Science. 118 (12): 2589–99. doi:10.1242/jcs.02396. PMID 15928047.
- Singec, Ilyas; Knoth, Rolf; Meyer, Ralf P; MacIaczyk, Jaroslaw; Volk, Benedikt; Nikkhah, Guido; Frotscher, Michael; Snyder, Evan Y (2006). "Defining the actual sensitivity and specificity of the neurosphere assay in stem cell biology". Nature Methods. 3 (10): 801–6. doi:10.1038/nmeth926. PMID 16990812.
- Louis, Sharon A.; Rietze, Rodney L.; Deleyrolle, Loic; Wagey, Ravenska E.; Thomas, Terry E.; Eaves, Allen C.; Reynolds, Brent A. (2008). "Enumeration of Neural Stem and Progenitor Cells in the Neural Colony-Forming Cell Assay". Stem Cells. 26 (4): 988–96. doi:10.1634/stemcells.2007-0867. PMID 18218818.