Circ_016719 plays a critical role in neuron cell apoptosis induced by I/R via targeting miR-29c/Map2k6.

Abstract:

BACKGROUND:Stroke is a leading cause of mortality worldwide. Rac-MAPK kinase 6 (Map2k6) plays important roles in cell proliferation and apoptosis. However, the role played by Map2k6 in stroke injury and the underlying mechanism of action remain unknown. METHODS:Mice received cerebral ischemia/reperfusion (I/R) injuries by transient middle cerebral artery occlusion. HT22 cells were subjected to oxygen glucose deprivation and reoxygenation (OGD/R) to simulate an I/R injury. Subsequently, the levels of circ_016719, miR-29c and Map2k6 expression were determined, and their interactions were examined by luciferase assays. Circ_016719 knockdown, miR-29c inhibition or Map2k6 overexpression was induced in HT22 cells; after which, the cells were examined for their viability, apoptosis, autophagy and proliferation, as well their levels of Map2k6, p38, p53, LC3B-I, LC3B-II, Beclin 1, and p62 expression. RESULTS:Significantly increased levels of circ_016719 and Map2k6, and decreased levels of miR-29c were observed in both in vivo and in vitro I/R injury models. In HT22 cells, circ_016719 knockdown significantly increased miR-29c expression and cell proliferation, but decreased Map2k6 expression and cell apoptosis. Additionally, significant increases in LC3B-I and p62 levels and decreased LC3B-II levels were observed, indicating that circ_016719 knockdown had significantly inhibited autophagy. Furthermore, additional inhibition of miR-29c markedly suppressed the effects of circ_016719 knockdown; however, that suppression was significantly attenuated by Map2k6 overexpression. Additionally, Map2k6 was identified as a direct target of miR-29c, which in turn, might be sponged by circ_016719. CONCLUSIONS:Our results suggest that circ_016719 directly targets miR-29c, and thereby regulates the expression and functions of Map2k6, which significantly contributes to the pro-apoptotic role of circ_016719.

journal_name

Mol Cell Probes

authors

Tang C,Ou J,Kou L,Deng J,Luo S

doi

10.1016/j.mcp.2019.101478

subject

Has Abstract

pub_date

2020-02-01 00:00:00

pages

101478

eissn

0890-8508

issn

1096-1194

pii

S0890-8508(19)30124-0

journal_volume

49

pub_type

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