内化
逮捕
血管紧张素II
受体
血管紧张素Ⅱ受体1型
细胞生物学
内吞作用
刺激
化学
酶联受体
生物
G蛋白偶联受体
生物物理学
内分泌学
生物化学
作者
Gyöngyi Szakadáti,András Tóth,Ilona Oláh,László Sándor Erdélyi,Tamás Balla,Péter Várnai,László Hunyady,András Balla
出处
期刊:Molecular Pharmacology
[American Society for Pharmacology & Experimental Therapeutics]
日期:2015-03-24
卷期号:87 (6): 972-981
被引量:26
标识
DOI:10.1124/mol.114.097030
摘要
Biased agonism on the type I angiotensin receptor (AT1-R) can achieve different outcomes via activation of G protein-dependent and -independent cellular responses. In this study, we investigated whether the biased activation of AT1-R can lead to different regulation and intracellular processing of the receptor. We analyzed β-arrestin binding, endocytosis, and subsequent trafficking steps, such as early and late phases of recycling of AT1-R in human embryonic kidney 293 cells expressing wild-type or biased mutant receptors in response to different ligands. We used Renilla luciferase-tagged receptors and yellow fluorescent protein-tagged β-arrestin2, Rab5, Rab7, and Rab11 proteins in bioluminescence resonance energy transfer measurements to follow the fate of the receptor after stimulation. We found that not only is the signaling of the receptor different upon using selective ligands, but the fate within the cells is also determined by the type of the stimulation. β-arrestin binding and the internalization kinetics of the angiotensin II-stimulated AT1-R differed from those stimulated by the biased agonists. Similarly, angiotensin II-stimulated wild-type AT1-R showed differences compared with a biased mutant AT1-R (DRY/AAY AT1-R) with regards to β-arrestin binding and endocytosis. We found that the differences in the internalization kinetics of the receptor in response to biased agonist stimulation are due to the differences in plasma membrane phosphatidylinositol 4,5-bisphosphate depletion. Moreover, the stability of the β-arrestin binding is a major determinant of the later fate of the internalized AT1-R receptor.
科研通智能强力驱动
Strongly Powered by AbleSci AI