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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 Biochim+Biophys+Acta
2016 ; 1862
(11
): 2023-2033
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Disruption of calpain reduces lipotoxicity-induced cardiac injury by preventing
endoplasmic reticulum stress
#MMPMID27523632
Li S
; Zhang L
; Ni R
; Cao T
; Zheng D
; Xiong S
; Greer PA
; Fan GC
; Peng T
Biochim Biophys Acta
2016[Nov]; 1862
(11
): 2023-2033
PMID27523632
show ga
Diabetes and obesity are prevalent in westernized countries. In both conditions,
excessive fatty acid uptake by cardiomyocytes induces cardiac lipotoxicity, an
important mechanism contributing to diabetic cardiomyopathy. This study
investigated the effect of calpain disruption on cardiac lipotoxicity.
Cardiac-specific capns1 knockout mice and their wild-type littermates (male, age
of 4weeks) were fed a high fat diet (HFD) or normal diet for 20weeks. HFD
increased body weight, altered blood lipid profiles and impaired glucose
tolerance comparably in both capns1 knockout mice and their wild-type
littermates. Calpain activity, cardiomyocyte cross-sectional areas, collagen
deposition and triglyceride were significantly increased in HFD-fed mouse hearts,
and these were accompanied by myocardial dysfunction and up-regulation of
hypertrophic and fibrotic collagen genes as well as pro-inflammatory cytokines.
These effects of HFD were attenuated by disruption of calpain in capns1 knockout
mice. Mechanistically, deletion of capns1 in HFD-fed mouse hearts and disruption
of calpain with calpain inhibitor-III, silencing of capn1, or deletion of capns1
in palmitate-stimulated cardiomyocytes prevented endoplasmic reticulum stress,
apoptosis, cleavage of caspase-12 and junctophilin-2, and pro-inflammatory
cytokine expression. Pharmacological inhibition of endoplasmic reticulum stress
diminished palmitate-induced apoptosis and pro-inflammatory cytokine expression
in cardiomyocytes. In summary, disruption of calpain prevents
lipotoxicity-induced apoptosis in cardiomyocytes and cardiac injury in mice fed a
HFD. The role of calpain is mediated, at least partially, through endoplasmic
reticulum stress. Thus, calpain/endoplasmic reticulum stress may represent a new
mechanism and potential therapeutic targets for cardiac lipotoxicity.