dobutamine

Dobutamine is a synthetic catecholamine that acts on α1-AR, β1-AR, β2-AR (α-1, β-1 andβ-2 adrenoceptors). Dobutamine is a selective β1-AR agonist, relatively weak activity at α1-AR and β2-AR. Dobutamine can increase cardiac output and correct hypoperfusion[1][2][3][4].

Research Areas >> Cardiovascular Disease

Research Areas >> Endocrinology

Signaling Pathways >> GPCR/G Protein >> Adrenergic Receptor

Dobutamine has a rapid onset of action and a short half-life [2]. Dobutamine (0.15-20 mg/kg; i.p.) results in subsequent increase in the left ventricular function and heart rate acceleration with an increasing dose in wildtype mice[3]. Dobutamine results in significant inotropic, lusitropic, and chronotropic cardiac response with a high dose in wildtype mice[3]. Low doses of Dobutamine significantly increases inotropic and lusitropic cardiac performance without chronotropic changes in the Tgαq*44 mice[3]. Dobutamine increases heart rate only after high doses, but then inotropic and lusitropic cardiac functional reserve is lost[3]. Dobutamine increases alveolar liquid clearance in ventilated rats by beta-2 receptor stimulation[4]. Animal Model: Tgαq*44 mice (heart failure models)[3] Dosage: 0.15 mg/kg, 0.5 mg/kg as a low dose, 1.5 mg/kg, 5 mg/kg, 20 mg/kg as a high dose Administration: Intraperitoneal injection Result: Induced different response in cardiac function on a low and high dose in mice with with heart failure.

[1]. Tuttle RR, et al. Dobutamine: development of a new catecholamine to selectively increase cardiac contractility. Circ Res. 1975 Jan;36(1):185-96.

[2]. Vallet B, et al. Dobutamine: mechanisms of action and use in acute cardiovascular pathology. Ann Cardiol Angeiol (Paris). 1991 Jun;40(6):397-402.

[3]. Tyrankiewicz U , et al. Characterization of the cardiac response to a low and high dose of dobutamine in the mouse model of dilated cardiomyopathy by MRI in vivo. J Magn Reson Imaging. 2013 Mar;37(3):669-77.

[4]. Tibayan FA, et al. Dobutamine increases alveolar liquid clearance in ventilated rats by beta-2 receptor stimulation. Am J Respir Crit Care Med. 1997 Aug;156(2 Pt 1):438-44.