Resting microglial cells in vitro: analysis of morphology and adhesion molecule expression in organotypic hippocampal slice cultures

Glia
N HailerR Nitsch

Abstract

Neurons in organotypic hippocampal slice cultures (OHSCs) are known to preserve morphological and physiological features of the in vivo situation; however, little is known about the properties of microglial cells under these in vitro conditions. In this study, we addressed the question whether microglial cells in OHSCs are initially activated following explantation but return to a resting state during in vitro cultivation. Thus, we analyzed a) microglial cell morphology, b) microglial cell distribution, and c) expression of integrin adhesion molecules as putative markers of microglial activation. Hippocampal slices fixed immediately following explantation showed only resting microglial cells, mainly located in the paraventricular regions. After 3 days in vitro (div) OHSC surfaces were covered by activated microglia, whereas intermediate layers contained fewer microglial cells, giving the slices a sandwich-like appearance with the intact hippocampal formation being surrounded by glial tissue. After 3 div, microglial cells in intermediate layers of OHSCs showed activated morphology with ovaloid cytoplasm and no or merely few cytoplasmic processes; after 6 div, however, an increasing degree of ramification could be observed. After...Continue Reading

Citations

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