[Adiponectin up-regulates the expression of T-cadherin in cardiomyocytes injured by hypoxia/reoxygenation].
The aim of the present study was to investigate the effects of adiponectin (APN) on the expression of T-cadherin in cultured Sprague-Dawley (SD) rat cardiomyocytes injured by hypoxia/reoxygenation (H/R). Primary myocardial cells from neonatal rats were obtained by enzymatic digestion. The cells were divided into control group, H/R group and H/R+APN (3, 10, 20 and 30 μg/mL) groups. The H/R group was incubated in anoxic environment (anoxic solution saturated with high concentration N2) for 3 h, and then in the reoxygenation environment (the reoxygenation solution saturated with pure oxygen) for 1 h. The H/R+APN group was pretreated with different concentrations of APN for 24 h prior to the initiation of H/R. The content of lactate dehydrogenase (LDH) was measured by chemistry chromatometry. Cellular apoptosis was analyzed by flow cytometry and terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL). The expression of T-cadherin was detected by RT-PCR and Western blotting. The results showed that, compared with control group, the apoptotic rate and release of LDH were significantly increased in the H/R group, whereas the expressions of T-cad mRNA and protein were decreased. Pretreating with APN significantly and dose-dependently decreased apoptotic rate and LDH release, and up-regulated T-cad mRNA and protein level in rat neonatal cardiomyocytes under H/R conditions. These results suggest that APN may protect cardiomyocytes against H/R-induced injury by up-regulating H/R-decreased T-cad expression.
Department of Cardiology, the Second Affiliated Hospital of Shanxi Medical University, Taiyuan, China.
Min
M
Wang
Ying-Ru
YR
Chai
Chuan-Shi
CS
Xiao
Xu-Jing
XJ
Zhao
Na
N
Wei
Rui
R
Bai
Yun-Fei
YF
Bian
D052242:Adiponectin / Q000494:pharmacology*; D000818:Animals; D017209:Apoptosis; D015820:Cadherins / Q000378:metabolism*; D015687:Cell Hypoxia; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D032383:Myocytes, Cardiac / Q000187:drug effects / Q000378:metabolism* / Q000473:pathology; D010100:Oxygen / Q000009:adverse effects; D051381:Rats; D017207:Rats, Sprague-Dawley; D015854:Up-Regulation
D052242:Adiponectin; D015820:Cadherins; C099972:H-cadherin; D007770:L-Lactate Dehydrogenase; D010100:Oxygen