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- W1864517042 abstract "Increase in intracellular calcium ([Ca2+]i) is a key mediator of astrocyte signaling, important for activation of the calcineurin (CN)/nuclear factor of activated T cells (NFAT) pathway, a central mediator of inflammatory events. We analyzed the expression of matrix metalloproteinase 3 (Mmp3) in response to increases in [Ca2+]i and the role of the CN/NFAT pathway in this regulation. Astrocyte Mmp3 expression was induced by overexpression of a constitutively active form of NFATc3, whereas other MMPs and tissue inhibitor of metalloproteinases (TIMP) were unaffected. Mmp3 mRNA and protein expression was also induced by calcium ionophore (Io) and 2′(3′)-O-(4-benzoylbenzoyl) adenosine 5′-triphosphate (Bz-ATP) and Mmp3 upregulation was prevented by the CN inhibitor cyclosporin A (CsA). Ca2+-dependent astrocyte Mmp3 expression was also inhibited by actinomycin D, and a Mmp3 promoter luciferase reporter was efficiently activated by increased [Ca2+]i, indicating regulation at the transcriptional level. Furthermore, Ca2+/CN/NFAT dependent Mmp3 expression was confirmed in pure astrocyte cultures derived from neural stem cells (Ast-NSC), demonstrating that the induced Mmp3 expression occurs in astrocytes, and not microglial cells. In an in vivo stab-wound model of brain injury, MMP3 expression was detected in NFATc3-positive scar-forming astrocytes. Because [Ca2+]i increase is an early event in most brain injuries, these data support an important role for Ca2+/CN/NFAT-induced astrocyte MMP3 expression in the early neuroinflammatory response. Understanding the molecular pathways involved in this regulation could provide novel therapeutic targets and approaches to promoting recovery of the injured brain." @default.
- W1864517042 created "2016-06-24" @default.
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- W1864517042 date "2013-04-26" @default.
- W1864517042 modified "2023-09-27" @default.
- W1864517042 title "NFATc3 promotes Ca<sup>2+</sup>-dependent MMP3 expression in astroglial cells" @default.
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- W1864517042 doi "https://doi.org/10.1002/glia.22494" @default.
- W1864517042 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23625833" @default.
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