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In Vitro Enfolding of Olfactory Neurites by p75 NGF Receptor Positive Ensheathing Cells from Adult Rat Olfactory Bulb

Secondary cultures of adult rat olfactory bulb (OB) contained three different types of cell: (i) process‐bearing cells; (ii) macrophage‐like cells and (iii) fusiform cells. The immunohistochemical properties of process‐bearing cells closely corresponded to those described for ensheathing glia in vivo. The most distinctive feature of these cells was their immunoreactivity for low affinity nerve growth factor receptor (NGFR). Process‐bearing cells also shared the ultrastructural properties of ensheathing glia in vivo, as well as the ability to ensheath olfactory axons. In contrast, macrophage‐like cells had the immunostaining properties of microglia, and fusiform cells were likely capillary endothelial cells.