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- W2080325092 abstract "The ontogeny of nyctohemeral variations of hypothalamic TRH content was determined in male rats from 7-45 days after birth, exposed to a daily 12-h light, 12-h dark cycle (0600-1800 h light; 1800-0600 h dark) or maintained in complete darkness until 45 days. TRH was extracted from whole hypothalami with 90% methanol and assayed by specific RIA. Hypothalamic TRH extracted from rats at different ages showed immunological, chromatographic, and biological properties identical to those of synthetic TRH. No significant variations in hypothalamic TRH content during the day were observed in 7-, 10-, and 17-day-old rats; a significant change, with a maximal value at 1800 h, was observed in 23-day-old rats, while an adult pattern with a maximal value at 1200 h and a minimal value at 2400 h was found in rats of 31 days of age and became more evident in 45-day-old rats. In animals maintained in complete darkness for 45 days after birth, no significant changes in hypothalamic TRH content at 1200 and 2400 h were observed. These findings indicate that environmental cyclic light-dark exposure is required for the development of diurnal changes in hypothalamic TRH content. Furthermore, any study involving hypothalamic TRH determination should take into account the age of animals and the diurnal variations of TRH." @default.
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- W2080325092 date "1986-07-01" @default.
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- W2080325092 title "Ontogeny of Nyctohemeral Variations of Thyrotropin- Releasing Hormone in Rat Hypothalamus" @default.
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- W2080325092 doi "https://doi.org/10.1210/endo-119-1-232" @default.
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