Produção Nacional
Revisado por pares
Triac (3,5,3'-Triiodothyroacetic Acid) Partially Inhibits the Thyrotropin Response to Synthetic Thyrotropin-Releasing Hormone in Normal and Thyroidectomized Hypothyroid Patients
1980; Oxford University Press; Volume: 50; Issue: 2 Linguagem: Inglês
10.1210/jcem-50-2-223
ISSN1945-7197
AutoresGeraldo Medeiros‐Neto, W Kallas, Meyer Knobel, H. Cavaliere, E Mattar,
Tópico(s)Pituitary Gland Disorders and Treatments
ResumoThe effects of a daily oral dose (1.4 mg) of 3,5,3'- Triiodothyroacetic acid (Triac) on thyroid hormone levels (T4, T3, and rT3) and on the TSH and PRL responses to TRH were studied in 15 normal subjects and 5 hypothyroid patients. There were no significant changes in weight, heart rate, reflex time, or serum concentration of either cholesterol or triglycerides after 6 weeks of Triac administration. However, T4 was significantly reduced to a lower mean level (mean ± SEM, 7.3 ± 0.7 to 4.3 ± 0.6 jug/dl) in the control group. T3 and rT3 concentrations increased, possibly due to a cross-reaction with Triac in their respective RIAs. The peak TSH response to TRH in the normal subjects was 17.6 ± 3.4 μU/ml and fell significantly to 2.0 ± 0.8 μU/ml after Triac administration. In the hypothyroid subjects the mean serum TSH level was significantly reduced from 136 ± 66 to 12.6, 10.5, and 11.6 μU±ml in the weeks after Triac administration. The mean peak response of both TSH and PRL after TRH (206 μU and 44.8 ng/ml, respectively) declined significantly to 63.4 μU/ml and 24 ng/ml. It was concluded that this dose of Triac partially inhibits the synthesis and secretion of TSH and PRL without any major peripheral metabolic effects.
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