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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 Am+J+Physiol+Endocrinol+Metab
2015 ; 308
(10
): E891-8
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
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English Wikipedia
C1q-TNF-related protein-9, a novel cardioprotetcive cardiokine, requires
proteolytic cleavage to generate a biologically active globular domain isoform
#MMPMID25783894
Yuan Y
; Lau WB
; Su H
; Sun Y
; Yi W
; Du Y
; Christopher T
; Lopez B
; Wang Y
; Ma XL
Am J Physiol Endocrinol Metab
2015[May]; 308
(10
): E891-8
PMID25783894
show ga
Prevalence and severity of postmyocardial infarction heart failure continually
escalate in type 2 diabetes via incompletely understood mechanisms. The discovery
of the cardiac secretomes, collectively known as "cardiokines", has significantly
enhanced appreciation of the local microenvironment's influence on disease
development. Recent studies demonstrated that C1q-TNF-related protein-9 (CTRP9),
a newly discovered adiponectin (APN) paralog, is highly expressed in the heart.
However, its relationship with APN (concerning diabetic cardiovascular injury in
particular) remains unknown. Plasma CTRP9 levels are elevated in APN knockout and
reduced in diabetic mice. In contrast to APN, which circulates as full-length
multimers, CTRP9 circulates in the plasma primarily in the globular domain
isoform (gCTRP9). Recombinant full-length CTRP9 (fCTRP9) was cleaved when
incubated with cardiac tissue extracts, generating gCTRP9, a process inhibited by
protease inhibitor cocktail. gCTRP9 rapidly activates cardiac survival kinases,
including AMPK, Akt, and endothelial NOS. However, fCTRP9-mediated kinase
activation is much less potent and significantly delayed. Kinase activation by
fCTRP9, but not gCTRP9, is inhibited by protease inhibitor cocktail. These
results demonstrate for the first time that the novel cardiokine CTRP9 undergoes
proteolytic cleavage to generate gCTRP9, the dominant circulatory and actively
cardioprotective isoform. Enhancing cardiac CTRP9 production and/or its
proteolytic posttranslational modification are of therapeutic potential,
attenuating diabetic cardiac injury.