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. 2013 May;16(5):543-51.
doi: 10.1038/nn.3358. Epub 2013 Mar 24.

Layer V cortical neurons require microglial support for survival during postnatal development

Masaki Ueno  1 , Yuki Fujita, Tatsuhide Tanaka, Yuka Nakamura, Junichi Kikuta, Masaru Ishii, Toshihide Yamashita
Affiliations

Layer V cortical neurons require microglial support for survival during postnatal development

Masaki Ueno et al. Nat Neurosci. 2013 May.

Abstract

Neurons require trophic support during neural circuit formation; however, how the cellular milieu contributes to neuronal survival remains unclear. We found that layer V cortical neurons require support from microglia for survival during postnatal development. Specifically, we found that microglia accumulated close to the subcerebral and callosal projection axons in the postnatal brain. Inactivation of microglia by minocycline treatment or transient ablation of microglia in CD11b-DTR transgenic mice led to increased apoptosis, specifically in layer V subcerebral and callosal projection neurons. CX3CR1 in microglia was required for the survival of layer V neurons. Microglia consistently promoted the survival of cortical neurons in vitro. In addition, we identified microglia-derived IGF1 as a trophic factor that maintained neuronal survival. Our results highlight a neuron-glia interaction that is indispensable for network formation during a specific period in the developing brain.

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