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. 1991;266(3):541–551. doi: 10.1007/BF00318596

Dynamic features of cells expressing macrophage properties in tissue cultures of dissociated cerebral cortex from the rat

Paul L Booth 1, W Eric Thomas 1
PMCID: PMC7088352  PMID: 1811883

Summary

Two previously identified forms of macrophage were investigated in primary cultures of cerebral cortical cells. Dynamic features were revealed through time-lapse video recording and aspects of macrophage function were assessed. The two cell forms were shown to be different pre-mitotic stages of a single cell type. The cell cycle for these cells involved an initial large, flat, quiescent cell which retracted to yield a slightly rounded form with numerous processes. This latter form lost processes and developed profuse filopodia as it became very rounded just prior to division; both resulting daughter cells then regained the initial large flat appearance. These cells possessed several properties of macrophages, including phagocytosis, nucleoside diphosphatase enzyme, and CR3 receptors. These properties were transient, expressed just before and after mitosis, but subsequently down-regulated in the flat daughter cells. Because of this feature, it was difficult to determine the exact size of this cell population; however, the observed rate of proliferation suggests it may be substantial. It is suggested that these cells correspond to non-microglial macrophages of brain tissue and, because of their significant down-regulation, they may be difficult to detect. This may be important in studies of brain accessory immune cells in tissue culture.

Key words: Brain, vertebrate; Macrophages; Tissue culture; Mitosis; Microglia; Astrocytes; Rat (Sprague-Dawley)

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