Can the hormones or chemicals released by a carcinoid stimulate the thyroid gland to produce more T3 & T4 the way TSH does?
Serotonin and the other usual products of carcinoids do not stimulate the thyroid or the adrenal glands. However, on rare occasions a carcinoid can co-produce other hormonal substances in addition to serotonin and chromogranin A. These could be TSH or catecholes like epinephrine or norephinephrine. Also, in rare cases a carcinoid develops in an individual with the MEN I syndrome who also has one or more other endocrine tumors which could produce TSH, epinephrine or a number of other active hormones.
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