Copper, an essential trace element in the body, is associated with several enzyme systems.1 In the blood, copper is about equally distributed between the erythrocytes and the plasma. Over 90% of the plasma copper is bound to globulin.2 This copperprotein (ceruloplasmin) catalyzes the oxidation of p-phenylenediamine compounds (ppd), a property which has been employed to estimate the ceruloplasmin level in serum.3 Although serum ceruloplasmin is affected by a wide variety of stressers, it is relatively constant in unstressed mammals. The mechanisms responsible for this copper homeostasis are only partially understood. However, there are indications that various hormones may be implicated.4-8 According to Narasaka,4-6 the injection of thyroxine effects an increase in the serum copper of rabbits. Similarly, various workers reported high serum copper levels in hyperthyroid patients.4,9,10 Kasanen and Viitanen 11 studied a relatively large number of thyrotoxic patients and concluded that
MEYER BJ, MEYER AC, HORWITT MK. Effect of Triiodothyronine on Serum Copper and Basal Metabolism in Schizophrenic PatientsCorrelations with Serum p-Phenylenediamine Oxidase, Erythrocyte Sedimentation, and C-Reactive Protein. AMA Arch Gen Psychiatry. 1959;1(4):372–378. doi:10.1001/archpsyc.1959.03590040042004
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