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q#7 endocrine - verymotivatedlearner
#1
what enzyme is important in peripheral conversion of T4 to T3? and whar drugs block this conversion?
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#2
5'diiodinase. propylthiouracil
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#3
good job - c5a
selenium dependent 5'-deiodinase
inhibited by propylthiouracil and propranolol


Some minimal effect on thyroid hormone production however also comes with Propranolol - which has two roles in the treatment of hyperthyroidism, determined by the different isomers of propranolol. L-propranolol causes beta-blockade, thus treating the symptoms associated with hyperthyroidism such as tremor, palpitations, anxiety, and heat intolerance. D-propranolol inhibits Thyroxine deiodinase, thereby blocking the conversion of T4 to T3, providing some though minimal therapeutic effect.
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