Abstract
The role of the sympathetic nervous system in the control of the goitrogenic response was examined in adult male rats subjected to superior cervical ganglionectomy (SCGx) 7 days earlier. In the first experiment, superior cervical ganglionectomized (SCGx) or sham-operated animals were treated with the goitrogenic agent methylmercaptoimidazole (MMI) for 4 days, and their thyroid weights and plasma TSH levels were measured. After MMI administration, the increase in thyroid weight was significantly greater in SCGx than in sham-operated rats. The plasma TSH increases after MMI were similar in both groups. To rule out the possible involvement of the pineal gland, MMI treatment was carried out in rats subjected to pinealectomy or sham pinealectomy 7 days earlier. Thyroid weights and plasma TSH levels after pinealectomy were not different from controls in vehicle- or MMI-treated rats. In a third experiment, the goitrogenic response to TSH was assessed in SCGx or shamoperated rats; the thyroid weight of SCGx anima...
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