Journal
AUTOPHAGY
Volume 14, Issue 7, Pages 1164-1184Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/15548627.2018.1458173
Keywords
Astrocyte activation; autophagy; circHECTD1; MIR142; stroke; TIPARP; tMCAO
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Funding
- National Natural Science Foundation of China (NSFC) [81673410, 81473190, 81603090]
- Fundamental Research Funds for the Central Universities
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYZZ16_0127]
- Major State Basic Research Development (973 Program) [2013CB733800, 2013CB733803]
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Circular RNAs (circRNAs) are highly expressed in the central nervous system and are involved in the regulation of physiological and pathophysiological processes. However, the potential role of circRNAs in stroke remains largely unknown. Here, using a circRNA microarray, we showed that circular RNA Hectd1 (circHectd1) levels were significantly increased in ischemic brain tissues in transient middle cerebral artery occlusion (tMCAO) mouse stroke models and further validated this finding in plasma samples from acute ischemic stroke (AIS) patients. Knockdown of circHectd1 expression significantly decreased infarct areas, attenuated neuronal deficits, and ameliorated astrocyte activation in tMCAO mice. Mechanistically, circHECTD1 functions as an endogenous MIR142 (microRNA 142) sponge to inhibit MIR142 activity, resulting in the inhibition of TIPARP (TCDD inducible poly[ADP-ribose] polymerase) expression with subsequent inhibition of astrocyte activation via macroautophagy/autophagy. Taken together, the results of our study indicate that circHECTD1 and its coupling mechanism are involved in cerebral ischemia, thus providing translational evidence that circHECTD1 can serve as a novel biomarker of and therapeutic target for stroke.
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