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01-07-2013 | Original Article

Differential distribution and activation of microglia in the brain of male C57BL/6J mice

Authors: Ting-Ting Yang, Chingju Lin, Chao-Tien Hsu, Tzu-Feng Wang, Fang-Yi Ke, Yu-Min Kuo

Published in: Brain Structure and Function | Issue 4/2013

Abstract

Upon certain stimuli, microglia undergo different degrees of transformation in order to maintain homeostasis of the CNS. However, chronic microglia activation has been suggested to play an active role in the pathogenesis of neurodegenerative diseases. The density of microglia and the degree of microglia activation vary among brain regions; such differences may underlie the brain region-specific characteristics of neurodegenerative diseases. In this study, we aim to characterize the temporal and spatial profiles of microglia activation induced by peripheral inflammation in male C57BL/6J mice. Our results showed that, on average, microglia densities were highest in the cortex, followed by the limbic area, basal nuclei, diencephalon, brainstem and cerebellum. Among the 22 examined brain nuclei/regions, the substantia nigra had the highest microglia density. Microglia morphological changes were evident within 3 h after a single intraperitoneal lipopolysaccharides injection, with the highest degree of changes also in the substantia nigra. The lipopolysaccharide-induced microglia activation, determined by maximal cell size, was positively correlated with density of microglia and levels of TNFα receptor 1; it was not correlated with original microglia cell size or integrity of blood–brain barrier. The differential response of microglia also cannot be explained by different types of neurotransmitters. Our works suggest that the high density of microglia and the high levels of TNFα receptor 1 in the substantia nigra make this brain region the most susceptible area to systemic immunological insults.

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Title: Differential distribution and activation of microglia in the brain of male C57BL/6J mice
Authors: Ting-Ting Yang
Chingju Lin
Chao-Tien Hsu
Tzu-Feng Wang
Fang-Yi Ke
Yu-Min Kuo
Publication date: 01-07-2013
Publisher: Springer-Verlag
Published in: Brain Structure and Function / Issue 4/2013
Print ISSN: 1863-2653
Electronic ISSN: 1863-2661
DOI: https://doi.org/10.1007/s00429-012-0446-x

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Differential distribution and activation of microglia in the brain of male C57BL/6J mice

Abstract

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