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• W2020179336 abstract "In heart failure chronic sympathetic activation results in contractile dysfunction in part through down-regulation of the β-adrenoceptor-cAMP system. However, the impact of chronic adrenergic activation on cardiac sympathetic neuromodulator systems is unclear. In this study, we sought to determine whether chronic adrenergic activation modifies myocardial norepinephrine release and contractile responses elicited by neurotensin, a neuropeptide found in cardiovascular system. Chronic administration of isoproterenol, a β-adrenoceptor agonist, to rats (0.05 mg/kg daily for 1 month, i.p.), produced cardiac hypertrophy with preserved baseline ventricular systolic function, but reduced contractile responses to exogenous norepinephrine as shown in isolated, isovolumically-contracting heart preparations. Neurotensin produced a marked increase in coronary effluent norepinephrine release, an effect abolished by SR 48692, a specific neurotensin receptor antagonist. In isoproterenol-treated rats, neurotensin has no significant impact on myocardial norepinephrine release. Consistently, concentration-dependent positive inotropic responses elicited by neurotensin in control rat hearts were blunted over a wide range of neurotensin concentrations (10− 10–10− 5.5 M) in isoproterenol-treated rats. In conclusion, these data indicate that following chronic β-adrenoceptor activation, neurotensin-induced effects on norepinephrine release and subsequent contractile changes are markedly down-regulated." @default.
• W2020179336 created "2016-06-24" @default.
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• W2020179336 date "2006-12-01" @default.
• W2020179336 modified "2023-09-27" @default.
• W2020179336 title "Impact of chronic β-adrenoceptor activation on neurotensin-induced myocardial effects in rats" @default.
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• W2020179336 doi "https://doi.org/10.1016/j.ejphar.2006.09.037" @default.
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