期刊
BASIC RESEARCH IN CARDIOLOGY
卷 116, 期 1, 页码 -出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00395-021-00905-4
关键词
Cardiac ischemia-reperfusion injury; Cardiac microvascular injury; HINT2; MCU complex; Mitochondrial calcium overload; Mitochondrial fission
资金
- National Program on Key Basic Research Project of China [2019YFC0840601, 2014CBA02003]
- National Natural Science Foundation of China [82170338, 81970295, 81800347, 81870267, 81521001, 81670318, 81570314, 81900307, 82000380]
- Grant of Shanghai Shenkang on Key Clinical Research Project [SHDC2020CR2015A, SHDC12019104]
- Grant of Shanghai Science and Technology Committee [19MC1910300, 18411950200, 20JC1410800]
- Key Medical and Health Projects of Xiamen Province [3502Z20204004]
- Shanghai Municipal Commission of Health and Family Planning [2017YQ057]
- Zhongshan Hospital Affiliated to Fudan University [2018ZSLC01]
- VG Funding of Clinical Trials [2017-CCA-VG-036]
- Merck [Xinxin-merck-fund-051]
The study demonstrated that HINT2 overexpression improved microvascular perfusion in I/R-injured mouse hearts by promoting eNOS expression and phosphorylation. Additionally, HINT2 repaired microvascular barrier function by inhibiting VE-Cadherin phosphorylation and enhancing VE-Cadherin/beta-Catenin interaction. HINT2 also suppressed inflammatory response by inhibiting VCAM-1 and ICAM-1, and relieved mitochondrial dysfunction and apoptosis in CMECs by modulating the MCU complex to reduce mitochondrial calcium overload.
Current evidence indicates that coronary microcirculation is a key target for protecting against cardiac ischemia-reperfusion (I/R) injury. Mitochondrial calcium uniporter (MCU) complex activation and mitochondrial calcium ([Ca2+](m)) overload are underlying mechanisms involved in cardiovascular disease. Histidine triad nucleotide-binding 2 (HINT2) has been reported to modulate [Ca2+](m) via the MCU complex, and our previous work demonstrated that HINT2 improved cardiomyocyte survival and preserved heart function in mice with cardiac ischemia. This study aimed to explore the benefits of HINT2 on cardiac microcirculation in I/R injury with a focus on mitochondria, the MCU complex, and [Ca2+](m) overload in endothelial cells. The present work demonstrated that HINT2 overexpression significantly reduced the no-reflow area and improved microvascular perfusion in I/R-injured mouse hearts, potentially by promoting endothelial nitric oxide synthase (eNOS) expression and phosphorylation. Microvascular barrier function was compromised by reperfusion injury, but was repaired by HINT2 overexpression via inhibiting VE-Cadherin phosphorylation at Tyr(731) and enhancing the VE-Cadherin/beta-Catenin interaction. In addition, HINT2 overexpression inhibited the inflammatory response by suppressing vascular cell adhesion molecule-1 (VCAM-1) and intercellular adhesion molecule-1 (ICAM-1). Mitochondrial fission occurred in cardiac microvascular endothelial cells (CMECs) subjected to oxygen-glucose deprivation/reoxygenation (OGD/R) injury and resulted in mitochondrial dysfunction and mitochondrion-dependent apoptosis, the effects of which were largely relieved by HINT2 overexpression. Additional experiments confirmed that [Ca2+](m) overload was an initiating factor for mitochondrial fission and that HINT2 suppressed [Ca2+](m) overload via modulation of the MCU complex through directly interacting with MCU in CMECs. Regaining [Ca2+](m) overload by spermine, an MCU agonist, abolished all the protective effects of HINT2 on OGD/R-injured CMECs and I/R-injured cardiac microcirculation. In conclusion, the present report demonstrated that HINT2 overexpression inhibited MCU complex-mitochondrial calcium overload-mitochondrial fission and apoptosis pathway, and thereby attenuated cardiac microvascular ischemia-reperfusion injury.
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