Abstract
BACKGROUND: Anti-obesity effects of calcium antagonists such as benidipine and nifedipine have been described in rodent obesity models, but the mode of action of the calcium antagonists as anti-obesity agents has not been established.
OBJECTIVE: To examine whether the anti-obesity effects of calcium antagonists (here benidipine) could be ascribed to a direct stimulation of brown adipose tissue (BAT) thermogenesis.
METHODS: Examination of the ability of benidipine to induce thermogenesis (increased rate of oxygen consumption) in isolated brown-fat cells from rats, mice and hamsters - and in intact cold-acclimated rats.
RESULTS: Benidipine itself, or in combination with any dose of noradrenaline (NA), was totally unable to induce or augment thermogenesis in isolated brown-fat cells of any species tested. However, it markedly induced thermogenesis in intact animals (approx 60% increase over resting metabolic rate). This effect could be fully inhibited by propranolol.
CONCLUSION: Benidipine is itself without thermogenic effect. The thermogenic response in-vivo (and thus presumably the anti-obesity effect) is probably secondary to a previously described general side-effect of calcium antagonists: a release of NA from sympathetic nerves, here most likely directly from nerves in the BAT. The anti-obesity effect of benedipine is thus probably not due to its calcium channel blocking effect.
PERSPECTIVES: It is probable that the anti-obesity effects of calcium antagonists reported in several models of genetically obese rodents (MSG-obese and agouti mice, SHHF/Mcc-facp and JCR:LA-corpulent rats) are mediated via an indirect stimulation of BAT. To what extent calcium antagonists may induce similar effects in a clinical situation, is currently unknown.
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Zhao, J., Golozoubova, V., Bengtsson, T. et al. Benidipine induces thermogenesis in brown adipose tissue by releasing endogenous noradrenaline: a possible mechanism for the anti-obesity effect of calcium antagonists. Int J Obes 23, 238–245 (1999). https://doi.org/10.1038/sj.ijo.0800800
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DOI: https://doi.org/10.1038/sj.ijo.0800800
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