Circular RNA TLK1 Aggravates Neuronal Injury and Neurological Deficits after Ischemic Stroke via miR-335-3p/TIPARP.

Autor:	Wu F; Department of Pharmacology, School of Medicine, Southeast University, Nanjing, 210009, Jiangsu, China.; Department of Neurology, Zhongda Hospital, Neuropsychiatric Institute, School of Medicine, Southeast University, Nanjing, 210009, Jiangsu, China., Han B; Department of Pharmacology, School of Medicine, Southeast University, Nanjing, 210009, Jiangsu, China., Wu S; Department of Pharmacology, School of Medicine, Southeast University, Nanjing, 210009, Jiangsu, China., Yang L; Department of Pharmacology, School of Medicine, Southeast University, Nanjing, 210009, Jiangsu, China., Leng S; Department of Radiology, School of Medicine, Southeast University, Nanjing, 210009, Jiangsu, China., Li M; Department of Pharmacology, School of Medicine, Southeast University, Nanjing, 210009, Jiangsu, China., Liao J; Department of Pharmacology, School of Medicine, Southeast University, Nanjing, 210009, Jiangsu, China., Wang G; Department of Pharmacology, School of Medicine, Southeast University, Nanjing, 210009, Jiangsu, China., Ye Q; Department of Pharmacology, School of Medicine, Southeast University, Nanjing, 210009, Jiangsu, China., Zhang Y; Department of Pharmacology, School of Medicine, Southeast University, Nanjing, 210009, Jiangsu, China., Chen H; Department of Neurology, Affiliated Drum Tower Hospital, and Jiangsu Key Laboratory for Molecular Medicine, Nanjing University Medical School, Nanjing, 210008, Jiangsu, China., Chen X; Emergency Department, Jiangsu Province Hospital and Nanjing Medical University First Affiliated Hospital, Nanjing, 210029, Jiangsu, China., Zhong M; Department of Biochemistry, School of Medicine, Southeast University, Nanjing, 210009, Jiangsu, China., Xu Y; Department of Neurology, Affiliated Drum Tower Hospital, and Jiangsu Key Laboratory for Molecular Medicine, Nanjing University Medical School, Nanjing, 210008, Jiangsu, China., Liu Q; Department of Neurobiology, Barrow Neurological Institute, Phoenix, Arizona 85013., Zhang JH; Department of Physiology, School of Medicine, Loma Linda University, Loma Linda, California 92354, and., Yao H; Department of Pharmacology, School of Medicine, Southeast University, Nanjing, 210009, Jiangsu, China, yaohh@seu.edu.cn.; Institute of Life Sciences, Key Laboratory of Developmental Genes and Human Disease, Southeast University, Nanjing, 210096, Jiangsu, China.
Jazyk:	angličtina
Zdroj:	The Journal of neuroscience : the official journal of the Society for Neuroscience [J Neurosci] 2019 Sep 11; Vol. 39 (37), pp. 7369-7393. Date of Electronic Publication: 2019 Jul 16.
DOI:	10.1523/JNEUROSCI.0299-19.2019
Abstrakt:	Circular RNAs (circRNAs) are expressed at high levels in the brain and are involved in various CNS diseases. However, the potential role of circRNAs in ischemic stroke-associated neuronal injury remains largely unknown. Here, we investigated the important functions of circRNA TLK1 (circTLK1) in this process. The levels of circTLK1 were significantly increased in brain tissues in a mouse model of focal cerebral ischemia and reperfusion. Knockdown of circTLK1 significantly decreased infarct volumes, attenuated neuronal injury, and improved neurological deficits. Furthermore, circTLK1 functioned as an endogenous miR-335-3p sponge to inhibit miR-335-3p activity, resulting in the increase of 2,3,7,8-tetrachlorodibenzo-p-dioxin-inducible poly (ADP-ribose) polymerase expression and a subsequent exacerbation of neuronal injury. Clinical studies confirmed increased levels of circTLK1 in the plasma of patients with acute ischemic stroke (59 males and 12 females). Our findings reveal a detrimental role of circTLK1 in ischemic brain injury. SIGNIFICANCE STATEMENT The extent of neuronal injury after brain ischemia is a primary factor determining stroke outcomes. However, the molecular switches that control the death of ischemic neurons are poorly understood. While our previous studies indicated the involvement of circRNAs in ischemic stroke, the potential role of circRNAs in neuronal injury remains largely unknown. The levels of circTLK1 were significantly increased in the brain tissue and plasma isolated from animal models of ischemic stroke and patients. Knockdown of circTLK1 significantly decreased infarct volumes, attenuated neuronal injury, and improved subsequent long-term neurological deficits. To our knowledge, these results provide the first definitive evidence that circTLK1 is detrimental in ischemic stroke. (Copyright © 2019 the authors.)
Databáze:	MEDLINE
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