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of or relating to or containing large star-shaped cells in the neuroglia
comparatively large neuroglial cell

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/07/09 12:37:48」(JST)

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Astrocytes (Astro from Greek astron = star and cyte from Greek "kyttaron" = cell), also known collectively as astroglia, are characteristic star-shaped glial cells in the brain and spinal cord. The proportion of astrocytes in the brain is not well defined. Depending on the counting technique used, studies have found that the astrocyte proportion varies by region and ranges from 20% to 40% of all glia.^[1] They perform many functions, including biochemical support of endothelial cells that form the blood–brain barrier, provision of nutrients to the nervous tissue, maintenance of extracellular ion balance, and a role in the repair and scarring process of the brain and spinal cord following traumatic injuries.

Research since the mid-1990s has shown that astrocytes propagate intercellular Ca²⁺ waves over long distances in response to stimulation, and, similar to neurons, release transmitters (called gliotransmitters) in a Ca²⁺-dependent manner. Data suggest that astrocytes also signal to neurons through Ca²⁺-dependent release of glutamate.^[2] Such discoveries have made astrocytes an important area of research within the field of neuroscience.

23-week-old fetal brain culture human astrocyte

1 Structure
- 1.1 Development
2 Function
- 2.1 Bergmann glia
- 2.2 Tripartite synapse
3 Clinical significance
- 3.1 Astrocytomas
- 3.2 Neurodevelopment disorders
- 3.3 Chronic pain
  - 3.3.1 Two states of persistent pain
- 3.4 Other pathologies
4 Recent studies
5 Classification
- 5.1 Lineage and antigenic phenotype
- 5.2 Anatomical classification
- 5.3 Transporter/receptor classification
6 See also
7 References
8 Further reading
9 External links

Structure

Astrocytes are a sub-type of glial cells in the central nervous system. They are also known as astrocytic glial cells. Star-shaped, their many processes envelop synapses made by neurons. Astrocytes are classically identified using histological analysis; many of these cells express the intermediate filament glial fibrillary acidic protein (GFAP).^[3] Several forms of astrocytes exist in the Central Nervous System including fibrous (in white matter), protoplasmic (in grey matter), and radial. The fibrous glia are usually located within white matter, have relatively few organelles, and exhibit long unbranched cellular processes. This type often has "vascular feet" that physically connect the cells to the outside of capillary walls when they are in close proximity to them. The protoplasmic glia are the most prevalent and are found in grey matter tissue, possess a larger quantity of organelles, and exhibit short and highly branched tertiary processes. The radial glia are disposed in planes perpendicular to axis of ventricles. One of their processes abuts the pia mater, while the other is deeply buried in gray matter. Radial glia are mostly present during development, playing a role in neuron migration. Müller cells of retina and Bergmann glia cells of cerebellar cortex represent an exception, being present still during adulthood. When in proximity to the pia mater, all three forms of astrocytes send out processes to form the pia-glial membrane.

Astrocytes (red-yellow) among neurons (green) in the living cerebral cortex

Development

Astrocytes are depicted in red. Cell nuclei are depicted in blue. Astrocytes were obtained from brains of newborn mice

Astrocytes are macroglial cells in the central nervous system. Astrocytes are derived from heterogeneous populations of progenitor cells in the neuroepithelium of the developing central nervous system. Recent works, summarized in a review by Rowitch and Kriegstein,^[4] indicate that there is remarkable similarity between the well known genetic mechanisms that specify the lineage of diverse neuron subtypes and that of macroglial cells. Just as with neuronal cell specification, canonical signaling factors like Sonic hedgehog (SHH), Fibroblast growth factor (FGFs), WNTs and bone morphogenetic proteins (BMPs), provide positional information to developing macroglial cells through morphogen gradients along the dorsal–ventral, anterior–posterior and medial–lateral axes. The resultant patterning along the neuraxis leads to segmentation of the neuroepithelium into progenitor domains (p0, p1 p2, p3 and pMN) for distinct neuron types in the developing spinal cord. On the basis of several studies it is now believed that that this model also applies to macroglial cell specification. Studies carried out by Hochstim and colleagues have demonstrated that three distinct populations of astrocytes arise from the p1, p2 and p3 domains.^[5] These subtypes of astrocytes can be identified on the basis of their expression of different transcription factors (PAX6, NKX6.1) and cell surface markers (reelin and SLIT1). The three populations of astrocyte subtypes which have been identified are 1) dorsally located VA1 astrocytes, derived from p1 domain, express PAX6 and reelin 2) ventrally located VA3 astrocytes, derived from p3, express NKX6.1 and SLIT1 and 3) and intermediate white-matter located VA2 astrocyte, derived from the p2 domain, which express PAX6, NKX6.1, reelin and SLIT1.^[6] After astrocyte specification has occurred in the developing CNS, it is believed that astrocyte precursors migrate to their final positions within the nervous system before the process of terminal differentiation occurs.

Function

Metabolic interactions between astrocytes and neurons.^[7]

Previously in medical science, the neuronal network was considered the only important function of astrocytes, and they were looked upon as gap fillers. More recently, the function of astrocytes has been reconsidered, and they are now thought to play a number of active roles in the brain, including the secretion or absorption of neural transmitters and maintenance of the blood–brain barrier.^[8] Following on this idea the concept of a "tripartite synapse" has been proposed, referring to the tight relationship occurring at synapses among a presynaptic element, a postsynaptic element and a glial element.^[9]

Structural: They are involved in the physical structuring of the brain. Astrocytes get their name because they are "star-shaped". They are the most abundant glial cells in the brain that are closely associated with neuronal synapses. They regulate the transmission of electrical impulses within the brain.
Glycogen fuel reserve buffer: Astrocytes contain glycogen and are capable of glycogenesis. The astrocytes next to neurons in the frontal cortex and hippocampus store and release glycogen. Thus, Astrocytes can fuel neurons with glucose during periods of high rate of glucose consumption and glucose shortage. Recent research suggests there may be a connection between this activity and exercise.^[10]
Metabolic support: They provide neurons with nutrients such as lactate.
Blood–brain barrier: The astrocyte end-feet encircling endothelial cells were thought to aid in the maintenance of the blood–brain barrier, but recent research indicates that they do not play a substantial role; instead, it is the tight junctions and basal lamina of the cerebral endothelial cells that play the most substantial role in maintaining the barrier.^[11] However, it has recently been shown that astrocyte activity is linked to blood flow in the brain, and that this is what is actually being measured in fMRI.^[12]^[13]
Transmitter uptake and release: Astrocytes express plasma membrane transporters such as glutamate transporters for several neurotransmitters, including glutamate, ATP, and GABA. More recently, astrocytes were shown to release glutamate or ATP in a vesicular, Ca²⁺-dependent manner.^[14] (This has been disputed for hippocampal astrocytes.)^[15]
Regulation of ion concentration in the extracellular space: Astrocytes express potassium channels at a high density. When neurons are active, they release potassium, increasing the local extracellular concentration. Because astrocytes are highly permeable to potassium, they rapidly clear the excess accumulation in the extracellular space.^[16] If this function is interfered with, the extracellular concentration of potassium will rise, leading to neuronal depolarization by the Goldman equation. Abnormal accumulation of extracellular potassium is well known to result in epileptic neuronal activity.^[17]
Modulation of synaptic transmission: In the supraoptic nucleus of the hypothalamus, rapid changes in astrocyte morphology have been shown to affect heterosynaptic transmission between neurons.^[18] In the hippocampus, astrocytes suppress synaptic transmission by releasing ATP, which is hydrolyzed by ectonucliotidases to yield adenosine. Adenosine acts on neuronal adenosine receptors to inhibit synaptic transmission, thereby increasing the dynamic range available for LTP.^[19]
Vasomodulation: Astrocytes may serve as intermediaries in neuronal regulation of blood flow.^[20]
Promotion of the myelinating activity of oligodendrocytes: Electrical activity in neurons causes them to release ATP, which serves as an important stimulus for myelin to form. However, the ATP does not act directly on oligodendrocytes. Instead, it causes astrocytes to secrete cytokine leukemia inhibitory factor (LIF), a regulatory protein that promotes the myelinating activity of oligodendrocytes. This suggests that astrocytes have an executive-coordinating role in the brain.^[21]
Nervous system repair: Upon injury to nerve cells within the central nervous system, astrocytes fill up the space to form a glial scar, repairing the area by transformation into neurons^[22] and replacing the CNS cells that cannot regenerate.^{[citation needed]}
Long-term potentiation: Scientists debate whether astrocytes integrate learning and memory in the hippocampus. Recently it has been shown that engrafting human glial progenitor cell in the nascent mice brains will cause the cells to differentiate into astrocytes. After differentiation these cells increase LTP and improve memory performance in the mice.^[23]

Astrocytes are linked by gap junctions, creating an electrically coupled (functional) syncytium.^[24] Because of this ability of astrocytes to communicate with their neighbors, changes in the activity of one astrocyte can have repercussions on the activities of others that are quite distant from the original astrocyte.

An influx of Ca²⁺ ions into astrocytes is the essential change that ultimately generates calcium waves. Because this influx is directly caused by an increase in blood flow to the brain, calcium waves are said to be a kind of hemodynamic response function. An increase in intracellular calcium concentration can propagate outwards through this functional syncytium. Mechanisms of calcium wave propagation include diffusion of calcium ions and IP3 through gap junctions and extracellular ATP signalling.^[25] Calcium elevations are the primary known axis of activation in astrocytes, and are necessary and sufficient for some types of astrocytic glutamate release.^[26]

Given the importance of calcium signaling in astrocytes, tight regulatory mechanisms for the progression of the spatio-temporal calcium signaling have been developed. Via mathematical analysis it has been shown that localized inflow of Ca²⁺ ions yields a localized raise in the cytosolic concentration of Ca²⁺ ions.^[27] Moreover, cytosolic Ca²⁺ accumulation is independent of every intracellular calcium flux and depends on the Ca²⁺ exchange across the membrane, cytosolic calcium diffusion, geometry of the cell, extracellular calcium perturbation, and initial concentrations.^[27]

Bergmann glia

SLC1A3 expression highlights Bergmann glia in the brain of a mouse at 7th postnatal day, sagittal section.

Bergmann glia, a type of glia^[28]^[29] also known as radial epithelial cells (as named by Camillo Golgi) or Golgi epithelial cells (GCEs; not to be mixed up with Golgi cells), are astrocytes in the cerebellum that have their cell bodies in the Purkinje cell layer and processes that extend into the molecular layer, terminating with bulbous endfeet at the pial surface. Bergmann glia express high densities of glutamate transporters that limit diffusion of the neurotransmitter glutamate during its release from synaptic terminals. Besides their role in early development of the cerebellum, Bergmann glia are also required for the pruning or addition of synapses.^{[citation needed]}

Tripartite synapse

Within the dorsal horn of the spinal cord, activated astrocytes have the ability to respond to almost all neurotransmitters^[30] and, upon activation, release a multitude of neuroactive molecules such as glutamate, ATP, nitric oxide (NO), prostaglandins (PG), and D-serine, which in turn influences neuronal excitability. The close association between astrocytes and presynaptic and postsynaptic terminals as well as their ability to integrate synaptic activity and release neuromodulators has been termed the "tripartite synapse".^[9] Synaptic modulation by astrocytes takes place because of this 3-part association.

Clinical significance

Astrocytomas

Astrocytomas are primary intracranial tumors derived from astrocytes cells of the brain. It is also possible that glial progenitors or neural stem cells give rise to astrocytomas.

Astrocytomas are brain tumors that develop from astrocytes. They may occur in many parts of the brain and sometimes in the spinal cord. They can occur at any age and they primarily occur in males. Astrocytomas are divided into two categories: Low grade (I and II) and High Grade (III and IV). Low grade tumors are more common in children and high grade tumors are more common in adults.^[31]

Pilocytic astrocytoma are Grade I tumors. They are considered benign and slow growing tumors. Pilocytic astrocytomas frequently have cystic portions filled with fluid and a nodule, which is the solid portion. Most are located in the cerebellum. Therefore, most symptoms are related to balance or coordination difficulties.^[31] They also occur more frequently in children and teens.^[32]

Grade II Tumors grow relatively slow but invade surrounding healthy tissue. Usually considered benign but can grow into malignant tumors. Other names that are used are Fibrillary or Protoplasmic astrocytomas. They are prevalent in younger people who are often present with seizures.^[32]

Anaplastic astrocytoma is classified as grade III and are malignant tumors. They grow more rapidly than lower grade tumors and tend to invade nearby healthy tissue. Anaplastic astrocytomas recur more frequently than lower grade tumors because of their tendency to spread into surrounding tissue makes them difficult to completely remove surgically.^[31]

Glioblastoma Multiforme is also a malignant tumor and classified as a grade IV. Glioblastomas can contain more than one cell type (i.e., astrocytes, oligondroctyes). Also, while one cell type may die off in response to a particular treatment, the other cell types may continue to multiply. Glioblastomas are the most invasive type of glial tumors as they grow rapidly and spread to nearby tissue. Approximately 50% of astrocytomas are glioblastomas and are very difficult to treat.^[31]

Neurodevelopment disorders

A relatively new direction has emerged in the field of neurodevelopmental disorders. This view states that astrocyte dysfunction may play a role in the aberration of neuronal circuitry that underlies certain psychiatric disorders, including the autism spectrum disorders (ASDs) and schizophrenia.^[33]^[34]

Chronic pain

Under normal conditions, pain conduction begins with some noxious signal followed by an action potential carried by nociceptive (pain sensing) afferent neurons, which elicit excitatory postsynaptic potentials (EPSP) in the dorsal horn of the spinal cord. That message is then relayed to the cerebral cortex, where we translate those EPSPs into "pain." Since the discovery of astrocytic influence, our understanding of the conduction of pain has been dramatically complicated. Pain processing is no longer seen as a repetitive relay of signals from body to brain, but as a complex system that can be up- and down-regulated by a number of different factors. One factor at the forefront of recent research is in the pain-potentiating synapse located in the dorsal horn of the spinal cord and the role of astrocytes in encapsulating these synapses. Garrison and co-workers^[35] were the first to suggest association when they found a correlation between astrocyte hypertrophy in the dorsal horn of the spinal cord and hypersensitivity to pain after peripheral nerve injury, typically considered an indicator of glial activation after injury. Astrocytes detect neuronal activity and can release chemical transmitters, which in turn control synaptic activity.^[30]^[36]^[37] In the past, hyperalgesia was thought to be modulated by the release of substance P and excitatory amino acids (EAA), such as glutamate, from the presynaptic afferent nerve terminals in the spinal cord dorsal horn. Subsequent activation of AMPA (α-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid), NMDA (N-methyl-D-aspartate) and kainate subtypes of ionotropic glutamate receptors follows. It is the activation of these receptors that potentiates the pain signal up the spinal cord. This idea, although true, is an oversimplification of pain transduction. A litany of other neurotransmitter and neuromodulators, such as calcitonin gene-related peptide (CGRP), adenosine triphosphate (ATP), brain-derived neurotrophic factor (BDNF), somatostatin, vasoactive intestinal peptide (VIP), galanin, and vasopressin are all synthesized and released in response to noxious stimuli. In addition to each of these regulatory factors, several other interactions between pain-transmitting neurons and other neurons in the dorsal horn have added impact on pain pathways.

Two states of persistent pain

After persistent peripheral tissue damage there is a release of several factors from the injured tissue as well as in the spinal dorsal horn. These factors increase the responsiveness of the dorsal horn pain-projection neurons to ensuing stimuli, termed "spinal sensitization," thus amplifying the pain impulse to the brain. Release of glutamate, substance P, and calcitonin gene-related peptide (CGRP) mediates NMDAR activation (originally silent because it is plugged by Mg2+), thus aiding in depolarization of the postsynaptic pain-transmitting neurons (PTN). In addition, activation of IP3 signaling and MAPKs (mitogen-activated protein kinases) such as ERK and JNK, bring about an increase in the synthesis of inflammatory factors that alter glutamate transporter function. ERK also further activates AMPARs and NMDARs in neurons. Nociception is further sensitized by the association of ATP and substance P with their respective receptors (P₂X₃) and neurokinin 1 receptor (NK1R), as well as activation of metabotropic glutamate receptors and release of BDNF. Persistent presence of glutamate in the synapse eventually results in dysregulation of GLT1 and GLAST, crucial transporters of glutamate into astrocytes. Ongoing excitation can also induce ERK and JNK activation, resulting in release of several inflammatory factors.

As noxious pain is sustained, spinal sensitization creates transcriptional changes in the neurons of the dorsal horn that lead to altered function for extended periods. Mobilization of Ca²⁺ from internal stores results from persistent synaptic activity and leads to the release of glutamate, ATP, tumor necrosis factor-α (TNF-α), interleukin 1β (IL-1β), IL-6, nitric oxide (NO), and prostaglandin E2 (PGE2). Activated astrocytes are also a source of matrix metalloproteinase 2 (MMP2), which induces pro-IL-1β cleavage and sustains astrocyte activation. In this chronic signaling pathway, p38 is activated as a result of IL-1β signaling, and there is a presence of chemokines that trigger their receptors to become active. In response to nerve damage, heat shock proteins (HSP) are released and can bind to their respective TLRs, leading to further activation.

Other pathologies

Other clinically significant pathologies involving astrocytes include astrogliosis and astrocytopathy.^[38]

Recent studies

A recent study, done in November 2010 and published March 2011, was done by a team of scientists from the University of Rochester and University of Colorado School of Medicine. They did an experiment to attempt to repair trauma to the Central Nervous System of an adult rat by replacing the glial cells. When the glial cells were injected into the injury of the adult rat’s spinal cord, astrocytes were generated by exposing human glial precursor cells to bone morphogenetic protein (Bone morphogenetic protein is important because it is considered to create tissue architecture throughout the body). So, with the bone protein and human glial cells combined, they promoted significant recovery of conscious foot placement, axonal growth, and obvious increases in neuronal survival in the spinal cord laminae. On the other hand, human glial precursor cells and astrocytes generated from these cells by being in contact with ciliary neurotrophic factors, failed to promote neuronal survival and support of axonal growth at the spot of the injury.^[39]

One study done in Shanghai had two types of hippocampal neuronal cultures: In one culture, the neuron was grown from a layer of astrocytes and the other culture was not in contact with any astrocytes, but they were instead fed a glial conditioned medium (GCM), which inhibits the rapid growth of cultured astrocytes in the brains of rats in most cases. In their results they were able to see that astrocytes had a direct role in Long-term potentiation with the mixed culture (which is the culture that was grown from a layer of astrocytes) but not in GCM cultures.^[40]

Recent studies have shown that astrocytes play an important function in the regulation of neural stem cells. Research from the Schepens Eye Research Institute at Harvard shows the human brain to abound in neural stem cells, which are kept in a dormant state by chemical signals (ephrin-A2 and ephrin-A3) from the astrocytes. The astrocytes are able to activate the stem cells to transform into working neurons by dampening the release of ephrin-A2 and ephrin-A3.^{[citation needed]}

In a study published in a 2011 issue of Nature Biotechnology^[41] a group of researchers from the University of Wisconsin reports that it has been able to direct embryonic and induced human stem cells to become astrocytes.

A 2012 study^[42] of the effects of marijuana on short term memories found that THC activates CB1 receptors of astrocytes which cause receptors for AMPA to be removed from the membranes of associated neurons.

Classification

There are several different ways to classify astrocytes.

Lineage and antigenic phenotype

These have been established by classic work by Raff et al. in early 1980s on Rat optic nerves.

Type 1: Antigenically Ran2⁺, GFAP⁺, FGFR3⁺, A2B5⁻, thus resembling the "type 1 astrocyte" of the postnatal day 7 rat optic nerve. These can arise from the tripotential glial restricted precursor cells (GRP), but not from the bipotential O2A/OPC (oligodendrocyte, type 2 astrocyte precursor, also called Oligodendrocyte progenitor cell) cells.
Type 2: Antigenically A2B5⁺, GFAP⁺, FGFR3⁻, Ran 2⁻. These cells can develop in vitro from the either tripotential GRP (probably via O2A stage) or from bipotential O2A cells (which some people^[who?] think may in turn have been derived from the GRP) or in vivo when these progenitor cells are transplanted into lesion sites (but probably not in normal development, at least not in the rat optic nerve). Type-2 astrocytes are the major astrocytic component in postnatal optic nerve cultures that are generated by O2A cells grown in the presence of fetal calf serum but are not thought to exist in vivo.^[43]

Anatomical classification

Protoplasmic: found in grey matter and have many branching processes whose end-feet envelop synapses. Some protoplasmic astrocytes are generated by multipotent subventricular zone progenitor cells.^[44]^[45]
Gömöri-positive astrocytes. These are a subset of protoplasmic astrocytes that contain numerous cytoplasmic inclusions, or granules, that stain positively with Gömöri's chrome-alum hematoxylin stain. It is now known that these granules are formed from the remnants of degenerating mitochondria engulfed within lysosomes,^[46] Some type of oxidative stress appears to be responsible for the mitochondrial damage within these specialized astrocytes. Gömöri-positive astrocytes are much more abundant within the arcuate nucleus of the hypothalamus and in the hippocampus than in other brain regions. They may have a role in regulating the response of the hypothalamus to glucose.^[47]^[48]

Fibrous: found in white matter and have long thin unbranched processes whose end-feet envelop nodes of Ranvier. Some fibrous astrocytes are generated by radial glia.^[49]^[50]^[51]^[52]^[53]

Transporter/receptor classification

GluT type: these express glutamate transporters (EAAT1/SLC1A3 and EAAT2/SLC1A2) and respond to synaptic release of glutamate by transporter currents. The function and availability of EAAT2 is modulated by TAAR1, an intracellular receptor in human astrocytes.^[54]
GluR type: these express glutamate receptors (mostly mGluR and AMPA type) and respond to synaptic release of glutamate by channel-mediated currents and IP3-dependent Ca²⁺ transients.

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^ Garrison, C.J.; Dougherty, P.M.; Kajander, K.C.; Carlton, S.M. (1991). "Staining of glial fibrillary acidic protein (GFAP) in lumbar spinal cord increases following a sciatic nerve constriction injury". Brain Research 565 (1): 1–7. doi:10.1016/0006-8993(91)91729-K. PMID 1723019.
^ Volterra, A. & Meldolesi, J. (2005). "Astrocytes, from brain glue to communication elements: the revolution continues". Nature Reviews Neuroscience 6 (8): 626–640. doi:10.1038/nrn1722. PMID 16025096.
^ Halassa, M.M.; Fellin, T. & Haydon, P.G. (2006). "The tripartite synapse: roles for gliotransmission in health and disease". Trends in Mol. Sci 13 (2): 54–63. doi:10.1016/j.molmed.2006.12.005. PMID 17207662.
^ Michael V. Sofroniew, Astrogliosis, Advance, November 7, 2014, doi:10.1101/cshperspect.a020420
^ Davies SJA; Shih C-H; Noble M; Mayer-Proschel M; Davies JE; et al. (2011). Combs, Colin, ed. "Transplantation of Specific Human Astrocytes Promotes Functional Recovery after spinal Cord Injury". PLoS ONE 6 (3): e17328. doi:10.1371/journal.pone.0017328. PMC 3047562. PMID 21407803.
^ Yang, Y. (2003). "Contribution of astrocytes to hippocampal long-term potentiation through release of D-serine". Proceedings of the National Academy of Sciences of the United States of America 100 (25): 15194–15199. doi:10.1073/pnas.2431073100.
^ Krencik, Robert; Weick, Jason P; Liu, Yan; Zhang, Zhi-Jian; Zhang, Su-Chun (2011). "Specification of transplantable astroglial subtypes from human pluripotent stem cells". Nature Biotechnology 29 (6): 528–534. doi:10.1038/nbt.1877. . Lay summary: Human Astrocytes Cultivated From Stem Cells In Lab Dish by U of Wisconsin Researchers. sciencedebate.com (22 May 2011)
^ Han J, Kesner P, Metna-Laurent M, Duan T, Xu L, Georges F, Koehl M, Abrous DN, Mendizabal-Zubiaga J, Grandes P, Liu Q, Bai G, Wang Q, Xiong L, Ren Q, Marsicano G, Zhang X (2012). "Acute Cannabinoids Impair Working Memory through Astroglial CB1 Receptor Modulation of Hippocampal LTD". Cell 148 (5): 1039–50. doi:10.1016/j.cell.2012.01.037. PMID 22385967.
^ Fulton, B. P.; Burne, J. F.; Raff, M. C. (1992). "Visualization of O-2A progenitor cells in developing and adult rat optic nerve by quisqualate-stimulated cobalt uptake". The Journal of neuroscience : the official journal of the Society for Neuroscience 12 (12): 4816–33. PMID 1281496.
^ Levison SW, Goldman JE (1993). "Both oligodendrocytes and astrocytes develop from progenitors in the subventricular zone of postnatal rat forebrain". Neuron 10 (2): 201–12. doi:10.1016/0896-6273(93)90311-E. PMID 8439409.
^ Zerlin M, Levison SW, Goldman JE (1995). "Early patterns of migration, morphogenesis, and intermediate filament expression of subventricular zone cells in the postnatal rat forebrain". J. Neurosci. 15 (11): 7238–49. PMID 7472478.
^ Brawer JR; Stein, Robert; Small, Lorne; Cissé, Soriba; Schipper, Hyman M. (1994). "Composition of Gomori-positive inclusions in astrocytes of the hypothalamic arcuate nucleus". Anatomical Record 240 (3): 407–415. doi:10.1002/ar.1092400313. PMID 7825737.
^ Young, J. K.; McKenzie, J. C. (2004). "GLUT2 immunoreactivity in Gomori-positive astrocytes of the hypothalamus". Journal of Histochemistry and Cytochemistry 52 (11): 1519–24. doi:10.1369/jhc.4A6375.2004. PMC 3957823. PMID 15505347.
^ Marty N (2005). "Regulation of glucagon secretion by glucose transporter type 2 (glut2) and astrocyte-dependent glucose sensors". J. Clinical Investigation 115 (12): 3545–3553. doi:10.1172/jci26309.
^ Choi BH, Lapham LW (1978). "Radial glia in the human fetal cerebrum: a combined Golgi, immunofluorescent and electron microscopic study". Brain Res. 148 (2): 295–311. doi:10.1016/0006-8993(78)90721-7. PMID 77708.
^ Schmechel DE, Rakic P (1979). "A Golgi study of radial glial cells in developing monkey telencephalon: morphogenesis and transformation into astrocytes". Anat. Embryol. 156 (2): 115–52. doi:10.1007/BF00300010. PMID 111580.
^ Misson JP, Edwards MA, Yamamoto M, Caviness VS (November 1988). "Identification of radial glial cells within the developing murine central nervous system: studies based upon a new immunohistochemical marker". Brain Res. Dev. Brain Res. 44 (1): 95–108. doi:10.1016/0165-3806(88)90121-6. PMID 3069243.
^ Voigt T (November 1989). "Development of glial cells in the cerebral wall of ferrets: direct tracing of their transformation from radial glia into astrocytes". J. Comp. Neurol. 289 (1): 74–88. doi:10.1002/cne.902890106. PMID 2808761.
^ Goldman SA, Zukhar A, Barami K, Mikawa T, Niedzwiecki D (August 1996). "Ependymal/subependymal zone cells of postnatal and adult songbird brain generate both neurons and nonneuronal siblings in vitro and in vivo". J. Neurobiol. 30 (4): 505–20. doi:10.1002/(SICI)1097-4695(199608)30:4<505::AID-NEU6>3.0.CO;2-7. PMID 8844514.
^ Cisneros IE, Ghorpade A (October 2014). "Methamphetamine and HIV-1-induced neurotoxicity: role of trace amine associated receptor 1 cAMP signaling in astrocytes". Neuropharmacology 85: 499–507. doi:10.1016/j.neuropharm.2014.06.011. PMID 24950453. Moreover, TAAR1 overexpression significantly decreased EAAT-2 levels and glutamate clearance that were further reduced by METH. Taken together, our data show that METH treatment activated TAAR1 leading to intracellular cAMP in human astrocytes and modulated glutamate clearance abilities. Furthermore, molecular alterations in astrocyte TAAR1 levels correspond to changes in astrocyte EAAT-2 levels and function.

External links

Cell Centered Database – Astrocyte
UIUC Histology Subject 57
"Astrocytes" at Society for Neuroscience
The Department of Neuroscience at Wikiversity
NIF Search – Astrocyte via the Neuroscience Information Framework

UpToDate Contents

全文を閲覧するには購読必要です。 To read the full text you will need to subscribe.

1. 神経膠腫の分類 classification of gliomas
2. 白色瞳孔を有する小児に対するアプローチ approach to the child with leukocoria
3. 低悪性度神経膠腫の診断および分類 diagnosis and classification of low grade gliomas
4. 悪性神経膠腫の病因と分子生物学 pathology and molecular pathogenesis of diffuse gliomas
5. 乏突起膠腫の臨床的特徴、病理、および予後因子 clinical features pathology and prognostic factors for oligodendroglial tumors

English Journal

A novel cognitive impairment mechanism that astrocytic p-connexin 43 promotes neuronic autophagy via activation of P2X7R and down-regulation of GLT-1 expression in the hippocampus following traumatic brain injury in rats.

Sun L1, Gao J2, Zhao M2, Cui J3, Li Y1, Yang X1, Jing X4, Wu Z5.
Behavioural brain research.Behav Brain Res.2015 Sep 15;291:315-24. doi: 10.1016/j.bbr.2015.05.049. Epub 2015 May 29.
Connexin 43 (Cx43) is one of the major gap junction proteins in astrocytes. Our previous studies reported that astrocytic phosphorylated Cx43 (p-CX43) regulated neuronic autophagy levels in the rat hippocampus after traumatic brain injury (TBI). In this study, we explored the underlying molecular me
PMID 26031379

Astrocytes regulate α-secretase-cleaved soluble amyloid precursor protein secretion in neuronal cells: Involvement of group IIA secretory phospholipase A2.

Yang X1, Sheng W2, Ridgley DM3, Haidekker MA4, Sun GY2, Lee JC5.
Neuroscience.Neuroscience.2015 Aug 6;300:508-17. doi: 10.1016/j.neuroscience.2015.05.052. Epub 2015 May 30.
Astrocytes are major supportive cells in brains with important functions including providing nutrients and regulating neuronal activities. In this study, we demonstrated that astrocytes regulate amyloid precursor protein (APP) processing in neuronal cells through secretion of group IIA secretory pho
PMID 26037803

Comparison of mechanisms of allodynia induced by acromelic acid A between early and late phases.

Omoto H1, Matsumura S2, Kitano M3, Miyazaki S4, Minami T5, Ito S6.
European journal of pharmacology.Eur J Pharmacol.2015 Aug 5;760:42-8. doi: 10.1016/j.ejphar.2015.03.075. Epub 2015 Apr 8.
We previously showed that intrathecal administration of acromelic acid A (ACRO-A) provoked tactile allodynia in mice. As well, recent studies have demonstrated that the activation of NMDA glutamate receptor-neuronal nitric oxide synthase (nNOS) pathway and glia play crucial roles in the development
PMID 25861935

Japanese Journal

拡散性伝達によるアストロサイトの活性化 (特集グリア研究の最先端) -- (グリア機能の基礎研究)

生体の科学 66(6), 551-555, 2015-11
NAID 40020670492

Rhabdoid Glioblastoma: An Aggressive Variety of Astrocytic Tumor

Nagoya Journal of Medical Science 77(1-2), 321-328, 2015-02
NAID 120005549579

脊髄腫瘍・脊髄血管障害に対する手術治療:—術中蛍光診断/神経内視鏡を併用して—

脳神経外科ジャーナル 24(5), 310-317, 2015
NAID 130005072410

Related Pictures

★リンクテーブル★

拡張検索	「astrocytic glioma」「astrocytic tumor」

「astrocytic glioma」

Astrocyte
	An astrocytic cell from rat brain grown in tissue culture and stained with antibodies to GFAP (red) and vimentin (green). Both proteins are present in large amounts in the intermediate filaments of this cell, so the cell appears yellow. The blue material shows DNA visualized with DAPI stain, and reveals the nuclei of the astrocyte and other cells. Image courtesy of EnCor Biotechnology Inc.
Details
Identifiers
Latin	Astrocytus
NeuroLex ID	Astrocyte
Dorlands; /Elsevier	12165688
	Anatomical terminology [edit on Wikidata]

　　[★]

星細胞腫、星状芽細胞腫

関: anaplastic astrocytoma、astroblastoma、astrocytoma、astroglioma、fibrillary astrocytoma、gemistocytic astrocytoma、grade I astrocytoma、grade II astrocytoma、grade III astrocytoma、juvenile pilocytic astrocytoma、mixed oligoastrocytoma、pilocytic astrocytoma、subependymal giant cell astrocytoma

「astrocytic tumor」

　　[★]

同: 星状細胞系腫瘍

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[3] Sarma, PotukuchiVenkata Gurunadha Krishna; Srikanth, Lokanathan; Vengamma, Bhuma; Venkatesh, Katari; Chandrasekhar, Chodimella; Mouleshwara Prasad, BodapatiChandra; Sanjeevkumar, Akula (2013). "In vitro differentiation of cultured human CD34+ cells into astrocytes". Neurology India 61 (4): 383–8. doi:10.4103/0028-3886.117615. PMID 24005729.

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[6] Hochstim, C; Deneen, B; Lukaszewicz, A; Zhou, Q; Anderson, DJ (2008). "Identification of positionally distinct astrocyte subtypes whose identities are specified by a homeodomain code". Cell 133 (3): 510–522. doi:10.1016/j.cell.2008.02.046. PMC 2394859. PMID 18455991.

[7] Çakιr, Tunahan; Alsan, Selma; Saybaşιlι, Hale; Akιn, Ata; Ülgen, Kutlu Ö (2007). "Reconstruction and flux analysis of coupling between metabolic pathways of astrocytes and neurons: application to cerebral hypoxia". Theoretical Biology and Medical Modelling 4 (1): 48. doi:10.1186/1742-4682-4-48. PMC 2246127. PMID 18070347.

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[10] Reynolds, Gretchen (22 February 2012). "How Exercise Fuels the Brain". New York Times.

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[14] Santello M, Volterra A (2008). "Synaptic modulation by astrocytes via Ca²⁺-dependent glutamate release.". Neuroscience. Mar 158 (1): 253–9. doi:10.1016/j.neuroscience.2008.03.039. PMID 18455880.

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[16] Walz W (2000). "Role of astrocytes in the clearance of excess extracellular potassium". Neurochemistry International 36 (4-5): 291–300. doi:10.1016/S0197-0186(99)00137-0.

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[18] Piet R, Vargová L, Syková E, Poulain D, Oliet S (2004). "Physiological contribution of the astrocytic environment of neurons to intersynaptic crosstalk". Proceedings of the National Academy of Sciences of the United States of America 101 (7): 2151–5. doi:10.1073/pnas.0308408100. PMC 357067. PMID 14766975.

[19] Pascual O, Casper KB, Kubera C, Zhang J, Revilla-Sanchez R, Sul JY, Takano H, Moss SJ, McCarthy K, Haydon PG (2005). "Astrocytic purinergic signaling coordinates synaptic networks". Science 310 (5745): 113–6. doi:10.1126/science.1116916. PMID 16210541.

[20] Parri R, Crunelli V (2003). "An astrocyte bridge from synapse to blood flow". Nature Neuroscience 6 (1): 5–6. doi:10.1038/nn0103-5. PMID 12494240.

[21] Ishibashi T, Dakin K, Stevens B, Lee P, Kozlov S, Stewart C, Fields R (2006). "Astrocytes Promote Myelination in Response to Electrical Impulses". Neuron 49 (6): 823–32. doi:10.1016/j.neuron.2006.02.006. PMC 1474838. PMID 16543131.

[22] ttp://lenta.ru/news/2014/10/12/cvi/

[23] Han, Xiaoning; Chen, Michael; Wang, Fushun; Windrem, Martha; Wang, Su; Shanz, Steven; Xu, Qiwu; Oberheim, Nancy Ann; Bekar, Lane (2013-07-03). "Forebrain Engraftment by Human Glial Progenitor Cells Enhances Synaptic Plasticity and Learning in Adult Mice". Cell Stem Cell 12 (3): 342–353. doi:10.1016/j.stem.2012.12.015. ISSN 1934-5909. PMC 3700554. PMID 23472873.

[24] Bennett M, Contreras J, Bukauskas F, Sáez J (2003). "New roles for astrocytes: gap junction hemichannels have something to communicate". Trends Neurosci 26 (11): 610–7. doi:10.1016/j.tins.2003.09.008. PMID 14585601.

[25] Newman, E. A. (2001). "Propagation of intercellular calcium waves in retinal astrocytes and Müller cells". The Journal of neuroscience : the official journal of the Society for Neuroscience 21 (7): 2215–23. PMC 2409971. PMID 11264297.

[26] Parpura V, Haydon P (2000). "Physiological astrocytic calcium levels stimulate glutamate release to modulate adjacent neurons". Proceedings of the National Academy of Sciences of the United States of America 97 (15): 8629–34. doi:10.1073/pnas.97.15.8629. PMC 26999. PMID 10900020.

[Spatial-27] Lopez-Caamal, F.; Oyarzun, D.A.; Middleton, R.H.; Garcia, M.R. (May 2014). "Spatial Quantification of Cytosolic Ca2+ Accumulation in Nonexcitable Cells:An Analytical Study". IEEE/ACM Transactions on Computational Biology and Bioinformatics 11 (3): 592–603. doi:10.1109/TCBB.2014.2316010.

[28] Riquelme R, Miralles C, De Blas A (2002). "Bergmann glia GABA(A) receptors concentrate on the glial processes that wrap inhibitory synapses". J. Neurosci. 22 (24): 10720–30. PMID 12486165.

[29] Yamada K, Watanabe M (2002). "Cytodifferentiation of Bergmann glia and its relationship with Purkinje cells". Anatomical Science International 77 (2): 94–108. doi:10.1046/j.0022-7722.2002.00021.x. PMID 12418089.

[Haydon2001-30] Haydon, Philip G. (2001). "Glia: listening and talking to the synapse" (PDF). Nature Reviews Neuroscience 2 (3): 185–193. doi:10.1038/35058528. PMID 11256079.

[ref32-31] Astrocytomas. International RadioSurgery Association (2010).

[ref33-32] Astrocytoma Tumors. American Association of Neurological Surgeons (August 2005).

[33] Barker, AJ; Ullian, EM (2008). "New roles for astrocytes in developing synaptic circuits.". Communicative & integrative biology 1 (2): 207–11. doi:10.4161/cib.1.2.7284. PMID 19513261.

[34] Sloan, SA; Barres, BA (Mar 29, 2014). "Mechanisms of astrocyte development and their contributions to neurodevelopmental disorders.". Current Opinion in Neurobiology 27C: 75–81. doi:10.1016/j.conb.2014.03.005. PMID 24694749.

[35] Garrison, C.J.; Dougherty, P.M.; Kajander, K.C.; Carlton, S.M. (1991). "Staining of glial fibrillary acidic protein (GFAP) in lumbar spinal cord increases following a sciatic nerve constriction injury". Brain Research 565 (1): 1–7. doi:10.1016/0006-8993(91)91729-K. PMID 1723019.

[36] Volterra, A. & Meldolesi, J. (2005). "Astrocytes, from brain glue to communication elements: the revolution continues". Nature Reviews Neuroscience 6 (8): 626–640. doi:10.1038/nrn1722. PMID 16025096.

[37] Halassa, M.M.; Fellin, T. & Haydon, P.G. (2006). "The tripartite synapse: roles for gliotransmission in health and disease". Trends in Mol. Sci 13 (2): 54–63. doi:10.1016/j.molmed.2006.12.005. PMID 17207662.

[38] Michael V. Sofroniew, Astrogliosis, Advance, November 7, 2014, doi:10.1101/cshperspect.a020420

[ref34-39] Davies SJA; Shih C-H; Noble M; Mayer-Proschel M; Davies JE; et al. (2011). Combs, Colin, ed. "Transplantation of Specific Human Astrocytes Promotes Functional Recovery after spinal Cord Injury". PLoS ONE 6 (3): e17328. doi:10.1371/journal.pone.0017328. PMC 3047562. PMID 21407803.

[ref36-40] Yang, Y. (2003). "Contribution of astrocytes to hippocampal long-term potentiation through release of D-serine". Proceedings of the National Academy of Sciences of the United States of America 100 (25): 15194–15199. doi:10.1073/pnas.2431073100.

[41] Krencik, Robert; Weick, Jason P; Liu, Yan; Zhang, Zhi-Jian; Zhang, Su-Chun (2011). "Specification of transplantable astroglial subtypes from human pluripotent stem cells". Nature Biotechnology 29 (6): 528–534. doi:10.1038/nbt.1877. . Lay summary: Human Astrocytes Cultivated From Stem Cells In Lab Dish by U of Wisconsin Researchers. sciencedebate.com (22 May 2011)

[42] Han J, Kesner P, Metna-Laurent M, Duan T, Xu L, Georges F, Koehl M, Abrous DN, Mendizabal-Zubiaga J, Grandes P, Liu Q, Bai G, Wang Q, Xiong L, Ren Q, Marsicano G, Zhang X (2012). "Acute Cannabinoids Impair Working Memory through Astroglial CB1 Receptor Modulation of Hippocampal LTD". Cell 148 (5): 1039–50. doi:10.1016/j.cell.2012.01.037. PMID 22385967.

[43] Fulton, B. P.; Burne, J. F.; Raff, M. C. (1992). "Visualization of O-2A progenitor cells in developing and adult rat optic nerve by quisqualate-stimulated cobalt uptake". The Journal of neuroscience : the official journal of the Society for Neuroscience 12 (12): 4816–33. PMID 1281496.

[pmid8439409-44] Levison SW, Goldman JE (1993). "Both oligodendrocytes and astrocytes develop from progenitors in the subventricular zone of postnatal rat forebrain". Neuron 10 (2): 201–12. doi:10.1016/0896-6273(93)90311-E. PMID 8439409.

[pmid7472478-45] Zerlin M, Levison SW, Goldman JE (1995). "Early patterns of migration, morphogenesis, and intermediate filament expression of subventricular zone cells in the postnatal rat forebrain". J. Neurosci. 15 (11): 7238–49. PMID 7472478.

[46] Brawer JR; Stein, Robert; Small, Lorne; Cissé, Soriba; Schipper, Hyman M. (1994). "Composition of Gomori-positive inclusions in astrocytes of the hypothalamic arcuate nucleus". Anatomical Record 240 (3): 407–415. doi:10.1002/ar.1092400313. PMID 7825737.

[47] Young, J. K.; McKenzie, J. C. (2004). "GLUT2 immunoreactivity in Gomori-positive astrocytes of the hypothalamus". Journal of Histochemistry and Cytochemistry 52 (11): 1519–24. doi:10.1369/jhc.4A6375.2004. PMC 3957823. PMID 15505347.

[48] Marty N (2005). "Regulation of glucagon secretion by glucose transporter type 2 (glut2) and astrocyte-dependent glucose sensors". J. Clinical Investigation 115 (12): 3545–3553. doi:10.1172/jci26309.

[pmid77708-49] Choi BH, Lapham LW (1978). "Radial glia in the human fetal cerebrum: a combined Golgi, immunofluorescent and electron microscopic study". Brain Res. 148 (2): 295–311. doi:10.1016/0006-8993(78)90721-7. PMID 77708.

[pmid111580-50] Schmechel DE, Rakic P (1979). "A Golgi study of radial glial cells in developing monkey telencephalon: morphogenesis and transformation into astrocytes". Anat. Embryol. 156 (2): 115–52. doi:10.1007/BF00300010. PMID 111580.

[pmid3069243-51] Misson JP, Edwards MA, Yamamoto M, Caviness VS (November 1988). "Identification of radial glial cells within the developing murine central nervous system: studies based upon a new immunohistochemical marker". Brain Res. Dev. Brain Res. 44 (1): 95–108. doi:10.1016/0165-3806(88)90121-6. PMID 3069243.

[pmid2808761-52] Voigt T (November 1989). "Development of glial cells in the cerebral wall of ferrets: direct tracing of their transformation from radial glia into astrocytes". J. Comp. Neurol. 289 (1): 74–88. doi:10.1002/cne.902890106. PMID 2808761.

[pmid8844514-53] Goldman SA, Zukhar A, Barami K, Mikawa T, Niedzwiecki D (August 1996). "Ependymal/subependymal zone cells of postnatal and adult songbird brain generate both neurons and nonneuronal siblings in vitro and in vivo". J. Neurobiol. 30 (4): 505–20. doi:10.1002/(SICI)1097-4695(199608)30:4<505::AID-NEU6>3.0.CO;2-7. PMID 8844514.

[Astrocyte-localized_TAAR1-54] Cisneros IE, Ghorpade A (October 2014). "Methamphetamine and HIV-1-induced neurotoxicity: role of trace amine associated receptor 1 cAMP signaling in astrocytes". Neuropharmacology 85: 499–507. doi:10.1016/j.neuropharm.2014.06.011. PMID 24950453. Moreover, TAAR1 overexpression significantly decreased EAAT-2 levels and glutamate clearance that were further reduced by METH. Taken together, our data show that METH treatment activated TAAR1 leading to intracellular cAMP in human astrocytes and modulated glutamate clearance abilities. Furthermore, molecular alterations in astrocyte TAAR1 levels correspond to changes in astrocyte EAAT-2 levels and function.

Astrocyte
An astrocytic cell from rat brain grown in tissue culture and stained with antibodies to GFAP (red) and vimentin (green). Both proteins are present in large amounts in the intermediate filaments of this cell, so the cell appears yellow. The blue material shows DNA visualized with DAPI stain, and reveals the nuclei of the astrocyte and other cells. Image courtesy of EnCor Biotechnology Inc.
Details
Identifiers
Latin	Astrocytus
NeuroLex ID	Astrocyte
Dorlands /Elsevier	12165688
*Anatomical terminology* [edit on Wikidata]

匿名

検索

案内

案内

astrocytic