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. 1989 Jul;135(1):135–147.

Astrocytes and microglia in human brain share an epitope recognized by a B-lymphocyte-specific monoclonal antibody (LN-1).

D W Dickson 1, L A Mattiace 1
PMCID: PMC1880225  PMID: 2476034

Abstract

A B-lymphocyte-specific mouse monoclonal antibody, LN-1, recognizes two morphologic classes of glial cells in human brain. The nature and duration of tissue fixation and processing are critical in the detection of the two cell types. In tissue that is lightly fixed, LN-1 recognizes astrocytes. The astrocytic nature of the LN-1 reactive glial cell was confirmed by cytologic features, tissue distribution, immunoelectron microscopy, double labeling immunofluorescent microscopy, and staining of serial sections with antibodies to glial fibrillary acidic protein. In tissue that is fixed for longer periods or in Bouin's fixative, two glial cell types are recognized: astrocytes and microglia. The identity of the latter cell type as microglia was confirmed by morphologic features, tissue distribution, immunoelectron microscopy, and double staining with monoclonal antibodies or lectins to macrophage markers, including class II major histocompatibility antigens. The two cell types had different disposition in senile plaques of elderly individuals and of those with Alzheimer's disease. Astrocytes were present at the periphery of the plaques, whereas microglial cells were centrally placed, often in juxtaposition to amyloid. The results are discussed with respect to ontogeny of glial cells and the ability of monoclonal antibodies to recognize epitopes on unrelated proteins.

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