Abstract:
AIMS:We investigated the influence of type one cannabinoid receptor (CB1) deficiency on acute heart failure (AHF) and the underlying mechanism. Acute heart failure syndrome is an important clinical problem because of its high morbidity and mortality rates. Activation of CB1 induces vascular dilation and reinforces the properties of morphine, long-standing therapies for AHF syndrome, but the effect of endogenous CB1 activation on AHF is largely unknown. METHODS AND RESULTS:Acute heart failure mouse model characterized by hypertension and pulmonary oedema was created by using transverse aortic constriction (TAC). Mortality, echocardiography, haemodynamic, morphology, and circulatory catecholamine levels in response to TAC were evaluated in CB1 knockout (KO) and wild-type mice. Type one cannabinoid receptor KO mice had a much higher mortality rate at 1 week after TAC attributable to AHF (65 vs. 11%, P< 0.001). One hour after TAC, CB1 KO mice had significant larger lung weight to body weight ratio (LW/BW, 14.53 + 1.09 mg/g in KO vs. 10.42 + 0.36 mg/g in WT, P < 0.01) and higher plasma epinephrine levels (9720 + 1226 pg/mL vs. 6378 + 832 pg/mL, P < 0.05). Pharmacological activation of CB1 reduced LW/BW in wild-type mice. Administration of epinephrine to wild-type TAC mice significantly increased left ventricular end-diastolic pressure and LW/BW, while CB1 agonists reduced the LW/BW and the plasma levels of catecholamine and increased myocardial activity of AMP-activated protein kinase. CONCLUSION:Endogenous activation of CB1 in mice has cardiac protection in AHF, which is attributable to the inhibition of excessive sympathetic activation.
journal_name
Eur Heart Jjournal_title
European heart journalauthors
Liao Y,Bin J,Asakura M,Xuan W,Chen B,Huang Q,Xu D,Ledent C,Takashima S,Kitakaze Mdoi
10.1093/eurheartj/ehr246subject
Has Abstractpub_date
2012-12-01 00:00:00pages
3124-33issue
24eissn
0195-668Xissn
1522-9645pii
ehr246journal_volume
33pub_type
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