Cross reactivity of polyclonal GFAP antiserum: implications for the in-vitro characterisation of brain endothelium
2004
Following a recent claim, based on glial acidic fibrillary protein (GFAP) expression, that brain-derived astrocytes in culture are in fact endothelial cells, we immuno-labelled primary cultures of rat brain astrocytes and endothelium with various GFAP antisera. Both cell types stained positively with a polyclonal antibody, although monoclonal antiserum labelled only astrocytes. We conclude that staining of endothelial cells with the polyclonal GFAP antiserum is due to cross reactivity with another protein.
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