Effect of 3,5-diiodo-L-thyronine on thyroid stimulating hormone and growth hormone serum levels in hypothyroid rats.
Moreno M, Lombardi A, Lombardi P, Goglia F, Lanni A.
T3 administration suppressed TSH by 88% compared to control (i.e, the level in hypothyroid rats); it thus reached a value not significantly different from that seen in the euthyroid rats. 3,5-T2 produced a similar effect, suppressing the TSH level by about 75% compared to control; it thus reached values not significantly different from those of the euthyroid and T3-treated rats. By contrast, 3,3'-T2 had no effect on TSH, whatever the dose