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IGF-1R stimulation alters microglial polarization via TLR4/NF-κB pathway after cerebral hemorrhage in mice.

Abstract：

:Intracerebral hemorrhage (ICH) is a common neurological disease, causing severe disability and even deaths. Stem cell transplantation has been increasingly used in stroke therapy, and neural stem cells (NSCs) are a good source for stem cell transplantation. However, the regulatory mechanism of NSCs remains unclear. In this study, we examined the impact of insulin-like growth factor-1 (IGF-1) secreted by NSCs on microglial polarization following ICH in adult C57BL/6 mice. Mouse models of ICH were established by collagenase injection. ICH mice received NSC transplantation 1 h after model establishment. Firstly, the changes of microglial polarization in cerebral tissues of ICH mice were detected by immunofluorescence and ELISA. Secondly, the molecular mechanism underlying the microglial polarization was evaluated repeatedly with the application of IGF-1R siRNA and IGF-1R-mediated inhibition. We assessed the brain water content and behavioral deficits of ICH mice 12, 24, 48, and 72 h after surgery. The survival of neurons in the brain was examined using Nissl staining and TUNEL staining at 72 h. The TLR4/NF-κB pathway implicated in ICH-induced inflammation was profiled by Western blot analysis and immunohistochemistry. Finally, the changes in microglia after ICH in mice were re-examined under different doses of rhIGF-1. In summary, NSC transplantation changed microglial polarization in ICH mice. IGF-1R inhibition and knockdown reversed the therapeutic effect of NSCs, and rhIGF-1 had an anti-inflammatory effect. The results of this study suggest that IGF-1R stimulation is a potential target for stem cell-based treatment of cerebral hemorrhage and may attenuate inflammatory response in the brain after bleeding.

journal_name

Brain Res Bull

journal_title

Brain research bulletin

authors

Sun Z,Wu K,Gu L,Huang L,Zhuge Q,Yang S,Wang Z

doi

10.1016/j.brainresbull.2020.08.026

subject

Has Abstract

pub_date

2020-11-01 00:00:00

pages

221-234

eissn

0361-9230

issn

1873-2747

pii

S0361-9230(20)30615-8

journal_volume

164

pub_type

杂志文章

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