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The aim of this investigation was to study the effect of beta-adrenoceptor blockade on alterations in protein metabolism induced by administration of 3,5,3'-triiodothyronine (T3) to man. Urinary excretion of 3-methylhistidine and plasma concentrations of amino acids were measured in seven healthy subjects following 1 weeks's administration of T3 alone or T3 in combination with the selective beta 1-adrenoceptor blocking agent metoprolol or the non-selective beta-adrenoceptor blocking agent propranolol. Urinary excretion of 3-methylhistidine and plasma concentrations of valine, methionine, lysine, tyrosine, phenylalanine, isoleucine, leucine, and total essential and branched chain amino acids increased following administration of T3, probably in part reflecting accelerated muscle proteolysis. Neither metoprolol nor propranolol normalized 3-methylhistidine excretion or plasma concentrations of amino acids during T3 treatment. The results indicate that metabolic alterations induced by T3 and giving rise to enhanced 3-methylhistidine excretion and elevated concentrations of plasma amino acids are not normalized by beta-adrenoceptor blockade.
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Professional nurse (London, England),
