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Pinocytosis as a select marker of ramified microglia in vivo and in vitro

PA Ranson and WE Thomas

Department of Oral Biology, College of Dentistry, Ohio State University, Columbus 43210.

Based on previous observations in tissue culture, we investigated pinocytotic activity as a potential cell marker for brain microglia. This functional activity was assessed in three different preparations derived from rat: primary cultures of mixed cerebral cortical cells, tissue slabs of whole cerebrum, and cultures of isolated or enriched microglial cells. Each preparation was incubated with the fluorescent dye lucifer yellow as a soluble tracer and then processed for light microscopy. Under the conditions utilized, ramified microglia specifically exhibited differentially high pinocytotic labeling in all cases; the dye was mainly localized within the cell somata, where it was sequestered in pinocytotic vesicles. In each preparation, the identity of the labeled cell population was confirmed as microglia through immunohistochemical staining with the monoclonal antibody (MAb) OX-42, a specific microglial marker. Therefore, pinocytotic labeling is proposed as a select cell marker for microglia, which may be extremely useful in the identification and study of ramified microglial cells.

Volume 39, Issue 6, pp. 853-858, 06/01/1991
Copyright © 1991 by The Histochemical Society


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