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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 Endocrinology
2014 ; 155
(6
): 2233-43
Nephropedia Template TP
gab.com Text
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English Wikipedia
Aldosterone s rapid, nongenomic effects are mediated by striatin: a modulator of
aldosterone s effect on estrogen action
#MMPMID24654783
Coutinho P
; Vega C
; Pojoga LH
; Rivera A
; Prado GN
; Yao TM
; Adler G
; Torres-Grajales M
; Maldonado ER
; Ramos-Rivera A
; Williams JS
; Williams G
; Romero JR
Endocrinology
2014[Jun]; 155
(6
): 2233-43
PMID24654783
show ga
The cellular responses to steroids are mediated by 2 general mechanisms: genomic
and rapid/nongenomic effects. Identification of the mechanisms underlying
aldosterone (ALDO)'s rapid vs their genomic actions is difficult to study, and
these mechanisms are not clearly understood. Recent data suggest that striatin is
a mediator of nongenomic effects of estrogen. We explored the hypothesis that
striatin is an intermediary of the rapid/nongenomic effects of ALDO and that
striatin serves as a novel link between the actions of the mineralocorticoid and
estrogen receptors. In human and mouse endothelial cells, ALDO promoted an
increase in phosphorylated extracellular signal-regulated protein kinases 1/2
(pERK) that peaked at 15 minutes. In addition, we found that striatin is a
critical intermediary in this process, because reducing striatin levels with
small interfering RNA (siRNA) technology prevented the rise in pERK levels. In
contrast, reducing striatin did not significantly affect 2 well-characterized
genomic responses to ALDO. Down-regulation of striatin with siRNA produced
similar effects on estrogen's actions, reducing nongenomic, but not some genomic,
actions. ALDO, but not estrogen, increased striatin levels. When endothelial
cells were pretreated with ALDO, the rapid/nongenomic response to estrogen on
phosphorylated endothelial nitric oxide synthase (peNOS) was enhanced and
accelerated significantly. Importantly, pretreatment with estrogen did not
enhance ALDO's nongenomic response on pERK. In conclusion, our results indicate
that striatin is a novel mediator for both ALDO's and estrogen's rapid and
nongenomic mechanisms of action on pERK and phosphorylated eNOS, respectively,
thereby suggesting a unique level of interactions between the mineralocorticoid
receptor and the estrogen receptor in the cardiovascular system.