循环腺单酸盐对心脏GLP-1受体的抗炎作用进行了关键调节
Renee A Stoicovy1, Natalie Cora1, Arianna Perez1
1Laboratory for the Study of Neurohormonal Control of the Circulation, Department of Pharmaceutical Sciences (Pharmacology), Barry and Judy Silverman College of Pharmacy, Nova Southeastern University, Fort Lauderdale, FL, 33328-2018, USA.
概括
类似葡萄糖 (GLP) - 1受体激活剂通过增加循环腺单酸盐 (cAMP) 来减少心脏炎症. 提高cAMP水平,例如通过固-4 (PDE4) 抑制,可以增强这些保护性心血管效应.
科学领域:
- 心血管药理学心血管药理学
- 分子心脏病学分子心脏病学
- 内分泌学 在内分泌学.
背景情况:
- 葡萄糖类 (GLP) - 1受体 (GLP1R) 激动剂提供了除了葡萄糖和体重控制之外的心血管益处.
- GLP1R信号传递涉及循环腺单酸盐 (cAMP) 生产,它具有抗炎和抗亡作用.
- 在GLP1R介导的心脏抗炎作用中cAMP的特定作用需要进一步阐明.
研究的目的:
- 研究cAMP在心脏细胞中调解GLP1R激动剂利拉格胺抗炎作用中的作用.
- 确定调节cAMP水平对利拉格卢提德对抗脂聚糖 (LPS) 诱导的心脏损伤的保护作用的影响.
主要方法:
- 利用暴露于LPS的H9c2心脏细胞来模拟急性炎症性损伤.
- 使用的利拉格卢提德,有或没有抑制腺酸环酶 (AC) 或基化酶 (PDE) -4抑制 (roflumilast).
- 评估了炎症标志物,亡和cAMP水平,并使用了GLP1R抗剂exendin ((9-39),PKA和Epac抑制剂.
主要成果:
- 利拉格卢提德剂量依赖性降低了LPS诱导的亡和增加了cAMP水平.
- 由GLP1R刺激的cAMP抑制了促炎性细胞因子 (TNF-a,IL-1b,IL-6),INOS,NF-kB和MMPs.
- 抑制AC消除了利拉格卢提德的保护作用,而抑制PDE4则增强了它们;抑制PKA和EPAC部分阻止了这些作用,而联合抑制完全阻止了它们.
结论:
- 循环腺单酸盐 (cAMP),通过蛋白激酶A (PKA) 和直接被cAMP激活的交换蛋白 (Epac) 起作用,对于GLP1R在心脏细胞中的抗炎信号传递至关重要.
- 心脏cAMP水平显著影响GLP1R激动剂在心脏中的有效性.
- 增加心脏cAMP的策略,如PDE4抑制,可能会增强GLP1R激素治疗的心血管和抗炎功效.
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