Genetic Depletion of Thromboxane A2/Thromboxane-Prostanoid Receptor Signalling Prevents Microvascular Dysfunction in Ischaemia/Reperfusion Injury

Thrombosis and Haemostasis - Tập 118 Số 11 - Trang 1982-1996 - 2018
Chih-Yao Chiang1,2, Chen‐Yen Chien3,4, Wei-Yin Qiou2, Christopher Chang5, I‐Shing Yu6, Po‐Yuan Chang7, Chiang‐Ting Chien2
1Department of Cardiovascular Surgery, Taipei City Hospital RenAi Branch, Taipei, Taiwan
2Department of Life Science, National Taiwan Normal University, Taipei, Taiwan
3Department of Surgery, Mackay Memorial Hospital and Mackay Medical College, Taipei, Taiwan
4Mackay Junior College of Medicine, Nursing, and Management, New Taipei City, Taiwan
5High School Division, Taipei American School, Taipei, Taiwan
6Laboratory of Animal Center, National Taiwan University College of Medicine, Taipei, Taiwan
7Division of Cardiology, Department of Internal Medicine and Cardiovascular Center, National Taiwan University College of Medicine, Taipei, Taiwan

Tóm tắt

Objective Activation of thromboxane A2 synthase (TXAS)/thromboxane A2 (TXA2)/thromboxane prostanoid (TP) receptor leads to arterial constriction, platelet aggregation and vascular injury. We attempted to characterize the microvascular dysfunction in ischaemia/reperfusion injury using genetically modified TXAS−/−, TP−/− and TXAS−/−TP−/− mice. Approach and Results The cardiac micro-circulation and electrocardiograms were evaluated from B6, TXAS−/−, TP−/− and TXAS−/−TP−/− mice in response to intravenous saline, endothelin-1, U46619 (a TXA2 agonist) and myocardial ischaemia/reperfusion injury. Cardiac function was investigated with myocardial permeability, the troponin I concentration and the infarct size. Myocardial TXAS, TP, endothelial nitric oxide (NO) synthase (eNOS), nicotinamide adenine dinucleotide phosphate oxidase 4 (NOx4), 4-hydroxynonenal, interleukin (IL)-1β, cell apoptosis, coronary effluent thromboxane B2 (TXB2) and superoxide anions (O2 −) and NO concentrations were measured. Mice mesenteric reactivity in response to various drugs was assessed by wire myography. In vivo fluorescent platelet adhesiveness to the mesenteric arterial endothelium after FeCl3 stimulation was examined. In B6 mice, ischaemia/reperfusion significantly increased levels of ST-segment elevation, myocardial TXAS, TP, NOx4, IL-1β, apoptosis, coronary endothelin-1, TXB2, O2 − release and the infarct size, with concomitant decreases in eNOS, NO concentrations and cardiac micro-circulation. These effects were remarkably depressed in TXAS−/−, TP−/− and TXAS−/−TP−/− mice. Aspirin treatment or depletion of the TXAS, TP or TXAS/TP gene significantly attenuated the exaggerated vascular reactivity by vasoconstrictors and vasodilators and efficiently reduced platelet adhesion to the mesenteric endothelium under FeCl3 stimulation. Conclusion Inhibiting TXAS/TXA2/TP signalling confers microvascular protection against oxidative injury in both cardiac and mesenteric arteries.

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Thrombosis and Haemostasis

Tập 118 Số 11

1982-1996

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