title: Dynamic alteration of adiponectin/adiponectin receptor expression and its impact on myocardial ischemia/reperfusion in type 1 diabetic mice.
abstract: The present study determined the dynamic change of adiponectin (APN, a cardioprotective adipokine), its receptor expression, and their impact upon myocardial ischemia/reperfusion (MI/R) injury during type 1 diabetes mellitus (T1DM) progression, and involved underlying mechanisms. Diabetic state was induced in mice via multiple intraperitoneal injections of low-dose streptozotocin. The dynamic change of plasma APN concentration and cardiac APN receptor-1 and -2 (AdipoR1/2) expression were assessed immediately after diabetes onset (0 wk) and 1, 3, 5, and 7 wk thereafter. Indicators of MI/R injury (infarct size, apoptosis, and LDH release) were determined at 0, 1, and 7 wk of DM duration. The effect of APN on MI/R injury was determined in mice subjected to different diabetic durations. Plasma APN levels (total and HMW form) increased, whereas cardiac AdipoR1 expression decreased early after T1DM onset. With T1DM progression, APN levels were reduced and cardiac AdipoR1 expression increased. MI/R injury was exacerbated with T1DM progression in a time-dependent manner. Administration of globular APN (gAD) failed to attenuate MI/R injury in 1-wk T1DM mice, while an AMP-activated protein kinase (AMPK) activator (AICAR) reduced MI/R injury. However, administration of gAD (and AICAR) reduced infarct size and cardiomyocyte apoptosis in 7-wk T1DM mice. In conclusion, our results demonstrate a dynamic dysfunction of APN/AdipoR1 during T1DM progression. Reduced cardiac AdipoR1 expression and APN concentration may be responsible for increased I/R injury susceptibility at early and late T1DM stages, respectively. Interventions bolstering AdipoR1 expression during early T1DM stages and APN supplementation during advanced T1DM stages may potentially reduce the myocardial ischemic injury in diabetic patients.
authors.affiliation: Dept. of Cardiology, Xijing Hospital, The Fourth military Medical University, Xi'an, China.
authors.forename: Yanzhuo
authors.initials: Y
authors.lastname: Ma
authors.forename: Yi
authors.initials: Y
authors.lastname: Liu
authors.forename: Shaowei
authors.initials: S
authors.lastname: Liu
authors.forename: Yan
authors.initials: Y
authors.lastname: Qu
authors.forename: Rutao
authors.initials: R
authors.lastname: Wang
authors.forename: Chenhai
authors.initials: C
authors.lastname: Xia
authors.forename: Haifeng
authors.initials: H
authors.lastname: Pei
authors.forename: Kun
authors.initials: K
authors.lastname: Lian
authors.forename: Tao
authors.initials: T
authors.lastname: Yin
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Lu
authors.forename: Lu
authors.initials: L
authors.lastname: Sun
authors.forename: Lu
authors.initials: L
authors.lastname: Yang
authors.forename: Yanjie
authors.initials: Y
authors.lastname: Cao
authors.forename: Wayne Bond
authors.initials: WB
authors.lastname: Lau
authors.forename: Erhe
authors.initials: E
authors.lastname: Gao
authors.forename: Haichang
authors.initials: H
authors.lastname: Wang
authors.forename: Ling
authors.initials: L
authors.lastname: Tao
mesh_terms: D000263:Adenylate Kinase / Q000378:metabolism; D052242:Adiponectin / Q000097:blood / Q000378:metabolism*; D000620:Aminoimidazole Carboxamide / Q000031:analogs & derivatives / Q000494:pharmacology / Q000627:therapeutic use; D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D003921:Diabetes Mellitus, Experimental / Q000378:metabolism*; D003922:Diabetes Mellitus, Type 1 / Q000378:metabolism*; D051379:Mice; D017202:Myocardial Ischemia / Q000378:metabolism*; D015425:Myocardial Reperfusion; D015428:Myocardial Reperfusion Injury / Q000188:drug therapy / Q000378:metabolism*; D009206:Myocardium / Q000378:metabolism; D032383:Myocytes, Cardiac / Q000187:drug effects / Q000378:metabolism; D054419:Receptors, Adiponectin / Q000097:blood / Q000378:metabolism*; D012265:Ribonucleotides / Q000494:pharmacology / Q000627:therapeutic use
chemical_list: D052242:Adiponectin; D054419:Receptors, Adiponectin; D012265:Ribonucleotides; D000620:Aminoimidazole Carboxamide; D000263:Adenylate Kinase; C031143:AICA ribonucleotide