Colocalization of taurine and glial fibrillary acidic protein immunoreactivity in mouse hippocampus induced by short-term ethanol exposure

Abstract

Morphological changes of the hippocampus were investigated in mice exhibiting signs of intoxication following short-term exposure to 6% ethanol. These alterations were examined by a double immunofluorescent study using antibodies to taurine and anti-glial fibrillary acidic protein (GFAP) antibody. Antibody-labeled taurine was localized mainly in the astrocytes and endothelial cells of control mice. Ethanol administration resulted in a significant increase in the accumulation of taurine and GFAP immunoreactivity (IR) in the stratum lacunosum-moleculare (sl-m) of the hippocampus. Specifically, the cell bodies of taurine-positive astrocytes were hypertrophied, their processes were elongated in the pericapillary region, and some colocalized with GFAP-IR cells. Furthermore, quantitative analysis revealed that the merged area in ethanol-treated mice was twice that (71.6% vs. 35.8%) of control mice. Since taurine is involved in various neuroprotective functions, the present observations suggest that the expression of taurine IR in reactive astrocytes after ethanol exposure might play an important role in neuroprotective processes.