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Evidence for activation of astrocytes via reactive microglial cells following hypoglossal nerve transection
Author(s) -
Svensson M.,
Eriksson N. P.,
Aldskogius H.
Publication year - 1993
Publication title -
journal of neuroscience research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.72
H-Index - 160
eISSN - 1097-4547
pISSN - 0360-4012
DOI - 10.1002/jnr.490350404
Subject(s) - axotomy , hypoglossal nucleus , glial fibrillary acidic protein , hypoglossal nerve , astrocyte , neuroglia , gfap stain , immunocytochemistry , microglia , biology , in situ hybridization , pathology , neuroscience , chemistry , microbiology and biotechnology , central nervous system , messenger rna , endocrinology , medicine , immunohistochemistry , tongue , immunology , biochemistry , gene , inflammation
Abstract Following peripheral nerve injury, resident microglial cells proliferate and astrocytes undergo hypertrophy, as evidenced, e.g., by an increase in the levels of glial fibrillary acidic protein (GFAP). In a previous study we have shown that infusion of cytosine arabinoside (ARA‐C) into the rat brain blocks the axotomy‐induced proliferation of microglial cells. This experimental approach has been used in the present study in order to explore the issue of whether the reactive microglial cells are mediators of the increased GFAP expression in the hypoglossal nucleus of the rat following axotomy. Quantitative analysis of sections processed for immunocytochemistry or in situ hybridization demonstrated a marked increase in GFAP‐like immunoreactivity and GFAP‐mRNA, respectively, in the ipsilateral hypoglossal nucleus 4 and 7 days after axotomy in control experiments. These increases failed to occur in axotomized animals treated with ARA‐C. Therefore, our data are compatible with the hypothesis that activation of astrocytes following axotomy as measured by increased expression of GFAP and its mRNA is induced secondarily to the microglial response. © 1993 Wiley‐Liss, Inc.