Neuroimmunological implications of AQP4 in astrocytes

Hiroko Ikeshima-Kataoka

    Research output: Contribution to journalReview article

    15 Citations (Scopus)

    Abstract

    The brain has high-order functions and is composed of several kinds of cells, such as neurons and glial cells. It is becoming clear that many kinds of neurodegenerative diseases are more-or-less influenced by astrocytes, which are a type of glial cell. Aquaporin-4 (AQP4), a membrane-bound protein that regulates water permeability is a member of the aquaporin family of water channel proteins that is expressed in the endfeet of astrocytes in the central nervous system (CNS). Recently, AQP4 has been shown to function, not only as a water channel protein, but also as an adhesion molecule that is involved in cell migration and neuroexcitation, synaptic plasticity, and learning/memory through mechanisms involved in long-term potentiation or long-term depression. The most extensively examined role of AQP4 is its ability to act as a neuroimmunological inducer. Previously, we showed that AQP4 plays an important role in neuroimmunological functions in injured mouse brain in concert with the proinflammatory inducer osteopontin (OPN). The aim of this review is to summarize the functional implication of AQP4, focusing especially on its neuroimmunological roles. This review is a good opportunity to compile recent knowledge and could contribute to the therapeutic treatment of autoimmune diseases through strategies targeting AQP4. Finally, the author would like to hypothesize on AQP4’s role in interaction between reactive astrocytes and reactive microglial cells, which might occur in neurodegenerative diseases. Furthermore, a therapeutic strategy for AQP4-related neurodegenerative diseases is proposed.

    Original languageEnglish
    Article number1306
    JournalInternational Journal of Molecular Sciences
    Volume17
    Issue number8
    DOIs
    Publication statusPublished - 2016 Aug 10

    Fingerprint

    Aquaporin 4
    Neurodegenerative diseases
    Astrocytes
    Proteins
    Brain
    Aquaporins
    proteins
    brain
    Water
    Neurodegenerative Diseases
    cells
    Neurology
    water
    central nervous system
    Neurons
    Plasticity
    Neuroglia
    Adhesion
    neurons
    plastic properties

    Keywords

    • Aquaporin 4 (AQP4)
    • Astrocyte
    • Blood-brain barrier (BBB)
    • Central nervous system (CNS)
    • Endofoot
    • Glial fibrillary acidic protein (GFAP)
    • Gliosis
    • IL-6
    • Immunoglobulin G (IgG)
    • Interleukin (IL)-1β
    • Microglia
    • Neuroimmunology
    • Neuromyelitis optica (NMO)
    • Osteopontin (OPN)
    • Reactive astrocyte
    • Tumor necrosis factor (TNF)-α

    ASJC Scopus subject areas

    • Catalysis
    • Molecular Biology
    • Computer Science Applications
    • Spectroscopy
    • Physical and Theoretical Chemistry
    • Organic Chemistry
    • Inorganic Chemistry

    Cite this

    Neuroimmunological implications of AQP4 in astrocytes. / Ikeshima-Kataoka, Hiroko.

    In: International Journal of Molecular Sciences, Vol. 17, No. 8, 1306, 10.08.2016.

    Research output: Contribution to journalReview article

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    AB - The brain has high-order functions and is composed of several kinds of cells, such as neurons and glial cells. It is becoming clear that many kinds of neurodegenerative diseases are more-or-less influenced by astrocytes, which are a type of glial cell. Aquaporin-4 (AQP4), a membrane-bound protein that regulates water permeability is a member of the aquaporin family of water channel proteins that is expressed in the endfeet of astrocytes in the central nervous system (CNS). Recently, AQP4 has been shown to function, not only as a water channel protein, but also as an adhesion molecule that is involved in cell migration and neuroexcitation, synaptic plasticity, and learning/memory through mechanisms involved in long-term potentiation or long-term depression. The most extensively examined role of AQP4 is its ability to act as a neuroimmunological inducer. Previously, we showed that AQP4 plays an important role in neuroimmunological functions in injured mouse brain in concert with the proinflammatory inducer osteopontin (OPN). The aim of this review is to summarize the functional implication of AQP4, focusing especially on its neuroimmunological roles. This review is a good opportunity to compile recent knowledge and could contribute to the therapeutic treatment of autoimmune diseases through strategies targeting AQP4. Finally, the author would like to hypothesize on AQP4’s role in interaction between reactive astrocytes and reactive microglial cells, which might occur in neurodegenerative diseases. Furthermore, a therapeutic strategy for AQP4-related neurodegenerative diseases is proposed.

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