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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 Circulation
2015 ; 131
(24
): 2120-30
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Circulating Exosomes Induced by Cardiac Pressure Overload Contain Functional
Angiotensin II Type 1 Receptors
#MMPMID25995315
Pironti G
; Strachan RT
; Abraham D
; Mon-Wei Yu S
; Chen M
; Chen W
; Hanada K
; Mao L
; Watson LJ
; Rockman HA
Circulation
2015[Jun]; 131
(24
): 2120-30
PMID25995315
show ga
BACKGROUND: Whether biomechanical force on the heart can induce exosome secretion
to modulate cardiovascular function is not known. We investigated the secretion
and activity of exosomes containing a key receptor in cardiovascular function,
the angiotensin II type I receptor (AT1R). METHODS AND RESULTS: Exosomes
containing AT1Rs were isolated from the media overlying AT1R-overexpressing cells
exposed to osmotic stretch and from sera of mice undergoing cardiac pressure
overload. The presence of AT1Rs in exosomes was confirmed by both electron
microscopy and radioligand receptor binding assays and shown to require
?-arrestin2, a multifunctional adaptor protein essential for receptor
trafficking. We show that functional AT1Rs are transferred via exosomes in an in
vitro model of cellular stretch. Using mice with global and cardiomyocyte
conditional deletion of ?-arrestin2, we show that under conditions of in vivo
pressure overload the cellular source of the exocytosis of exosomes containing
AT1R is the cardiomyocyte. Exogenously administered AT1R-enriched exosomes target
cardiomyocytes, skeletal myocytes, and mesenteric resistance vessels and are
sufficient to confer blood pressure responsiveness to angiotensin II infusion in
AT1R knockout mice. CONCLUSIONS: AT1R-enriched exosomes are released from the
heart under conditions of in vivo cellular stress to likely modulate vascular
responses to neurohormonal stimulation. In the context of the whole organism, the
concept of G protein-coupled receptor trafficking should consider circulating
exosomes as part of the reservoir of functional AT1Rs.