Microglia and the developing olfactory bulb

Neuroscience
A O Caggiano, P C Brunjes

Abstract

The developmental appearance of microglia in the rat olfactory bulb was investigated through the use of selective staining with the B4-isolectin from Griffonia simplicifolia. No changes in the density or distribution of either the spherical, macrophage "ameboid" form or the highly arborized "ramified" variety of microglia were observed in the superficial layers of the bulb between postnatal days 10 and 30. The subependymal zone exhibited the only substantial population of ameboid cells and the only developmental increases in ramified cell density during this time-period. External single naris closure, which enhances cell death in the ipsilateral bulb, did not affect microglia density, presumably due to the unusually high numbers of microglia normally present in the bulb. The olfactory bulb has a dense and relatively uniform population of microglial cells from very early stages of postnatal life, perhaps because of the constant turnover of cells and processes.

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