Summary
A double blind placebo-controlled study was conducted of the effects of oral propranolol (β1β2-adrenoceptor antagonist) and terbutaline (β2-adrenoceptor agonist) on erythrocyte heat production, measured by direct microcalorimetry under static conditions at 37°C and pH 7.4. Propranolol 80 mg and terbutaline slow-release 7.5 mg were randomly administered twice daily for one week to 15 healthy males, using a cross-over design.
No thermogenic difference was detected. Serum potassium was significantly decreased by terbutaline but was only slightly increased by propranolol, but no relationship was found between changes in the extra- and intracellular levels. In the placebo group, 10% of total cell energy was consumed by the Na-K pump, as assessed by ouabain inhibition, and this value was not significantly affected by the treatments. Thus, it seems unlikely that there is a clinically relevant influence on the Na-K pump in erythrocytes during continuous terbutaline or propranolol medication.
It is concluded that short term medication with propranolol and terbutaline in therapeutic doses has almost no thermal or metabolic effect on human erythrocytes. The results indirectly imply that no clinically relevant β-adrenoceptor effects are mediated in erythrocytes and this may also be true with regard to the ‘membrane effect’ of propranolol.
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Fagher, B., Liedholm, H. & Monti, M. Lack of influence of short-term treatment with propranolol and terbutaline on metabolism and energy expenditure of the Na-K pump in human erythrocytes evaluated by microcalorimetry. Eur J Clin Pharmacol 45, 571–576 (1993). https://doi.org/10.1007/BF00315317
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DOI: https://doi.org/10.1007/BF00315317