Postnatal development of brain TRH, serum TSH and thyroid hormones in the male and female rat

Abstract
The postnatal development of immunoreactive TRH in the central nervous system (CNS), serum TSH and thyroid hormones was studied in both male and female normal rats. While in most structures of the CNS, TRH increased until day 20–30, serum TSH values peaked at day 15 as did T4. Significant differences were also obtained between both sexes in these parameters. These data further support the fact that pituitary-thyroid axis maturation is independent of brain TRH.

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