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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Cell+Biochem
2018 ; 119
(4
): 3586-3597
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Mechanoactivation of the angiotensin II type 1 receptor induces ?-arrestin-biased
signaling through G?(i) coupling
#MMPMID29231251
Wang J
; Hanada K
; Gareri C
; Rockman HA
J Cell Biochem
2018[Apr]; 119
(4
): 3586-3597
PMID29231251
show ga
Ligand activation of the angiotensin II type 1 receptor (AT1R), a member of the G
protein-coupled receptor (GPCR) family, stimulates intracellular signaling to
mediate a variety of physiological responses. The AT1R is also known to be a
mechanical sensor. When activated by mechanical stretch, the AT1R can signal via
the multifunctional adaptor protein ?-arrestin, rather than through classical
heterotrimeric G protein pathways. To date, the AT1R conformation induced by
membrane stretch in the absence of ligand was thought to be the same as that
induced by ?-arrestin-biased agonists, which selectively engage ?-arrestin
thereby preventing G protein coupling. Here, we show that in contrast to the
?-arrestin-biased agonists TRV120023 and TRV120026, membrane stretch uniquely
promotes the coupling of the inhibitory G protein (G?(i) ) to the AT1R to
transduce signaling. Stretch-triggered AT1R-G?(i) coupling is required for the
recruitment of ?-arrestin2 and activation of downstream signaling pathways, such
as EGFR transactivation and ERK phosphorylation. Our findings demonstrate
additional complexity in the mechanism of receptor bias in which the recruitment
of G?(i) is required for allosteric mechanoactivation of the AT1R-induced
?-arrestin-biased signaling.
|GTP-Binding Protein alpha Subunits, Gi-Go/metabolism
[MESH]
|HEK293 Cells
[MESH]
|Humans
[MESH]
|Immunoprecipitation
[MESH]
|Microscopy, Confocal
[MESH]
|Oligopeptides/pharmacology
[MESH]
|Receptor, Angiotensin, Type 1/agonists/*metabolism
[MESH]