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2015 ; 26
(9
): 2129-38
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gab.com Text
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Kelch-Like Protein 2 Mediates Angiotensin II-With No Lysine 3 Signaling in the
Regulation of Vascular Tonus
#MMPMID25556166
Zeniya M
; Morimoto N
; Takahashi D
; Mori Y
; Mori T
; Ando F
; Araki Y
; Yoshizaki Y
; Inoue Y
; Isobe K
; Nomura N
; Oi K
; Nishida H
; Sasaki S
; Sohara E
; Rai T
; Uchida S
J Am Soc Nephrol
2015[Sep]; 26
(9
): 2129-38
PMID25556166
show ga
Recently, the kelch-like protein 3 (KLHL3)-Cullin3 complex was identified as an
E3 ubiquitin ligase for with no lysine (WNK) kinases, and the impaired
ubiquitination of WNK4 causes pseudohypoaldosteronism type II (PHAII), a
hereditary hypertensive disease. However, the involvement of WNK kinase
regulation by ubiquitination in situations other than PHAII has not been
identified. Previously, we identified the WNK3-STE20/SPS1-related
proline/alanine-rich kinase-Na/K/Cl cotransporter isoform 1 phosphorylation
cascade in vascular smooth muscle cells and found that it constitutes an
important mechanism of vascular constriction by angiotensin II (AngII). In this
study, we investigated the involvement of KLHL proteins in AngII-induced WNK3
activation of vascular smooth muscle cells. In the mouse aorta and mouse vascular
smooth muscle (MOVAS) cells, KLHL3 was not expressed, but KLHL2, the closest
homolog of KLHL3, was expressed. Salt depletion and acute infusion of AngII
decreased KLHL2 and increased WNK3 levels in the mouse aorta. Notably, the
AngII-induced changes in KLHL2 and WNK3 expression occurred within minutes in
MOVAS cells. Results of KLHL2 overexpression and knockdown experiments in MOVAS
cells confirmed that KLHL2 is the major regulator of WNK3 protein abundance. The
AngII-induced decrease in KLHL2 was not caused by decreased transcription but
increased autophagy-mediated degradation. Furthermore, knockdown of sequestosome
1/p62 prevented the decrease in KLHL2, suggesting that the mechanism of KLHL2
autophagy could be selective autophagy mediated by sequestosome 1/p62. Thus, we
identified a novel component of signal transduction in AngII-induced vascular
contraction that could be a promising drug target.
|Adaptor Proteins, Signal Transducing/genetics
[MESH]