Abstract
The efficiency (work/oxygen consumption) of isolated papillary muscles from failing hearts is reduced. We investigated whether this can be due to an increase of intrinsic cardiac adrenergic (ICA) cell density. The number of ICA cells in the septum and both ventricular walls was determined by tyrosine hydroxylase immunohistochemistry in rats with monocrotaline-induced pulmonary hypertension. We found that the number of ICA cells is about 200,000 per rat heart. ICA cell density was significantly lower in right ventricular myocardium of hypertrophied hearts (P < 0.01). MAO-A enzyme histochemistry and inhibition experiments with clorgyline in papillary muscles were performed to localize the enzyme and to determine its oxygen consumption. Upregulation of MAO-A was found in the right ventricular wall and papillary muscles of failing hearts (P = 0.018). A positive correlation between ICA cell density and MAO-A activity was absent. Clorgyline (2 μM) decreased the basal rate of oxygen consumption of right ventricular papillary muscles by 65 μM O2/s (P = 0.027). This rate can only be maintained for several seconds judging from the catecholamine content of the preparations reported previously. High ICA cell activity rather than density and/or recycling of oxidized catecholamines are discussed as alternative explanations for the low myocardial efficiency in experimental pulmonary hypertension.
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We thank I. Schalij and P. Sneekes for expert technical assistance.
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van Eif, V.W.W., Bogaards, S.J.P. & van der Laarse, W.J. Intrinsic cardiac adrenergic (ICA) cell density and MAO-A activity in failing rat hearts. J Muscle Res Cell Motil 35, 47–53 (2014). https://doi.org/10.1007/s10974-013-9373-6
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DOI: https://doi.org/10.1007/s10974-013-9373-6