Journal
EXPERIMENTAL NEUROLOGY
Volume 323, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.expneurol.2019.113082
Keywords
Chitinase 3-like 1; Ischemia/reperfusion injury; Inflammation; Macrophage; M2 polarization; IL-4R alpha; STAT6
Categories
Funding
- National Research Foundation of Korea [NRF] - Korea government (MSIP) [MRC, 2017R1A5A2015541]
- Functional Districts of the Science Belt support program, Ministry of Science, ICT and Future Planning
Ask authors/readers for more resources
Chitinase 3-like 1 (Chi3L1) plays a major role in the pathogenesis of inflammatory diseases. We investigated the effect of Chi3L1 knockout on stroke development. Ischemia/reperfusion was induced by middle cerebral artery occlusion (MCAO) in Chi3L1 knockout and wildtype mice. Significantly increased infarct volume and decreased neurological deficit scores at 24 h after ischemia/reperfusion were found in Chi3L1 knockout mice compared to wildtype mice. Moreover, ischemic neuronal cell death was increased in Chi3L1 knockout mice through increased oxidative stress and release of IL-6 and IL-1 beta but IL-10 and IL-4 were reduced. Furthermore, expression of inflammation-related proteins (iNOS, COX-2, Iba-1, and GFAP) was significantly increased in Chi3L1 knockout mice compared to wildtype. In microglia isolated from MCAO-injured Chi3L1 knockout mice, expression of M1 markers (iNOS, CD86, IL-1 beta, and IL-6) was increased and M2 markers (Arg1, Mrc1, IL-10, and IL-4R alpha) was decreased. In BV-2 cells, knockdown of Chi3L1 increased TNF-alpha- and INF-gamma-induced expression of iNOS, COX-2, and Iba-1, but decreased the expression of Arg1, MRC1, and IL-4 receptor-alpha (IL-4R alpha). Expression of IL-4R alpha, an important factor of M2 polarization, and its downstream signals p-JAK1, p-JAK3, and p-STAT6, was much reduced in the knockout mice. Additionally, in BV-2 cells, knockdown of Chi3L1 by siRNA Chi3L1 decreased rhTNF-alpha- and INF-gamma-induced expression of IL-4R alpha, p-JAK1, p-JAK3, and p-STAT6. Furthermore, treatment with AS1517499 abolished Chi3L1 knockdown-induced reduced IL-4R alpha and Arg1 but not CD86 expression. Our results indicate that deletion of Chi3L1 accelerates stroke development through enhancement of neuroinflammation by markedly decreasing STAT6-dependent M2 macrophage polarization.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available