Key result
Doxorubicin-induced heart failure impaired sympathetic regulation of vascular contraction, with a significantly lower maximum response to noradrenaline in the vena cava compared to controls.
Why the study?
Does doxorubicin-induced heart failure alter the contraction responses of peripheral vessels to noradrenaline and KCl in a rabbit model?
Does doxorubicin-induced heart failure alter the contraction responses of peripheral vessels to noradrenaline and KCl in a rabbit model?
Doxorubicin-induced heart failure impairs sympathetic regulation of vascular contraction in specific peripheral vessels, likely through reduction in alpha-adrenoceptors.
Should not alter doxorubicin use or HF management; leaves open vascular alpha-adrenoceptor mechanisms in anthracycline cardiotoxicity.
The purpose of the work presented here was to investigate the responses mediated by alpha-adrenoceptors and also contractility of vascular smooth muscle in large peripheral vessels following doxorubicin (DXR)-induced heart failure. Cardiac failure was induced by DXR injection. Thirty saline-treated (normal group) and 30 DXR-treated rabbits (1 mg/kg administered intravenously twice weekly for 8 weeks) were studied. Chronic heart failure was confirmed by echocardiography and later also by histopathology. The DXR-treated hearts were subdivided by ejection fraction >40 or <40 into non-failing (control) and failing (test) groups. Animals were sacrificed by overdose with pentobarbitone sodium (i.v. injection). Arteries and veins were carefully removed with as little connective tissue as possible and placed in cold physiological salt solution. The arterial and venous rings were mounted in 10 ml isolated organ baths, maintained at 37 degrees C and gassed with 95% O(2) plus 5% CO(2). The rings were then placed under different resting tensions. After initial application of tension tissues were left to equilibrate for a 60-min period. Then all preparations were contracted with KCl (Krebs solution, Na free and high KCl, 125 mM) and allowed to contract for 5-10 min. Following complete washout with normal Krebs, an additional 30 min equilibration period was allowed. Then cumulative concentration-response curves to noradrenaline (NA) obtained by increasing the concentration of the agonist in half-log increments. In contraction responses to NA the renal artery and aorta were the most sensitive preparations (pD(2) values: 5.75 and 5.36, respectively). Compared with control, in DXR-treated rabbits, maximum response (E(max)) of NA was not modified in the aorta; renal and saphenous arteries, renal and saphenous veins, whereas it was significantly lower in the vena cava. Compared with control rabbits, in DXR-treated rabbits the pD(2) of NA was significantly increased in the thoracic aorta whereas there was no significant difference between groups in the other studied vessels. Contraction to KCl showed no significant difference between two groups. These results suggest that the sympathetic regulation of vascular contraction is impaired by DXR-induced heart failure through reduction in the alpha-adrenoceptors.
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Ahmadiasl et al. (2002) studied Doxorubicin-induced heart failure (n=60). Doxorubicin-induced heart failure vs. Saline-treated (normal) and non-failing doxorubicin-treated rabbits was evaluated on Vascular contraction responses to noradrenaline and KCl. Doxorubicin-induced heart failure impaired sympathetic regulation of vascular contraction, with a significantly lower maximum response to noradrenaline in the vena cava compared to controls.
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