Astrocytes: biology and pathology
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TLDR
Astrocyte functions in healthy CNS, mechanisms and functions of reactive astrogliosis and glial scar formation, and ways in which reactive astrocytes may cause or contribute to specific CNS disorders and lesions are reviewed.Abstract:
Astrocytes are specialized glial cells that outnumber neurons by over fivefold. They contiguously tile the entire central nervous system (CNS) and exert many essential complex functions in the healthy CNS. Astrocytes respond to all forms of CNS insults through a process referred to as reactive astrogliosis, which has become a pathological hallmark of CNS structural lesions. Substantial progress has been made recently in determining functions and mechanisms of reactive astrogliosis and in identifying roles of astrocytes in CNS disorders and pathologies. A vast molecular arsenal at the disposal of reactive astrocytes is being defined. Transgenic mouse models are dissecting specific aspects of reactive astrocytosis and glial scar formation in vivo. Astrocyte involvement in specific clinicopathological entities is being defined. It is now clear that reactive astrogliosis is not a simple all-or-none phenomenon but is a finely gradated continuum of changes that occur in context-dependent manners regulated by specific signaling events. These changes range from reversible alterations in gene expression and cell hypertrophy with preservation of cellular domains and tissue structure, to long-lasting scar formation with rearrangement of tissue structure. Increasing evidence points towards the potential of reactive astrogliosis to play either primary or contributing roles in CNS disorders via loss of normal astrocyte functions or gain of abnormal effects. This article reviews (1) astrocyte functions in healthy CNS, (2) mechanisms and functions of reactive astrogliosis and glial scar formation, and (3) ways in which reactive astrocytes may cause or contribute to specific CNS disorders and lesions.read more
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Journal ArticleDOI
Neurotoxic reactive astrocytes are induced by activated microglia
Shane A. Liddelow,Kevin A. Guttenplan,Laura E. Clarke,Frederick C. Bennett,Christopher J. Bohlen,Lucas Schirmer,Mariko L. Bennett,Alexandra E. Münch,Won-Suk Chung,Todd C. Peterson,Daniel K. Wilton,Arnaud Frouin,Brooke A. Napier,Nikhil Panicker,Manoj Kumar,Marion S. Buckwalter,David H. Rowitch,Valina L. Dawson,Ted M. Dawson,Beth Stevens,Ben A. Barres +20 more
TL;DR: It is shown that activated microglia induce A1 astrocytes by secreting Il-1α, TNF and C1q, and that these cytokines together are necessary and sufficient to induce A2 astroCytes, which are abundant in various human neurodegenerative diseases.
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Neuroinflammation in Alzheimer's disease
Michael T. Heneka,Monica J. Carson,Joseph El Khoury,Gary E. Landreth,Frederic Brosseron,Douglas L. Feinstein,Andreas H. Jacobs,Tony Wyss-Coray,Tony Wyss-Coray,Javier Vitorica,Richard M. Ransohoff,Karl Herrup,Sally A. Frautschy,Bente Finsen,Guy C. Brown,Alexei Verkhratsky,Alexei Verkhratsky,Alexei Verkhratsky,Koji Yamanaka,Jari Koistinaho,Eicke Latz,Eicke Latz,Annett Halle,Gabor C. Petzold,Terrence Town,Dave Morgan,Mari L. Shinohara,V. Hugh Perry,Clive Holmes,Clive Holmes,Nicolas G. Bazan,David J. Brooks,Stéphane Hunot,Bertrand Joseph,Nikolaus Deigendesch,Olga Garaschuk,Erik Boddeke,Charles A. Dinarello,John C.S. Breitner,Greg M. Cole,Douglas T. Golenbock,Markus P. Kummer +41 more
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Degeneration and regeneration of the nervous system
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Immune attack: the role of inflammation in Alzheimer disease
TL;DR: As inflammation in AD primarily concerns the innate immune system — unlike in 'typical' neuroinflammatory diseases such as multiple sclerosis and encephalitides — the concept of neuroinflammation in AD may need refinement.
Book ChapterDOI
The role of glia in the spinal cord in neuropathic and inflammatory pain
TL;DR: Here microglia and astrocytes respond to the increased input from the periphery and change morphology, increase in number and release pro-nociceptive mediators such as ATP, cytokines and chemokines which contribute to central sensitization which is fundamental for the generation of allodynia, hyperalgesia and spontaneous pain.
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