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. 1992 Feb;12(1):1–19. doi: 10.1007/BF00711635

Ontogenic studies of the neural control of adenohypophyseal hormones in the rat. II. prolactin

Damasia Becú-Villalobos 1, Isabel María Lacau-Mengido 1, Graciela S Díaz-Torga 1, Carlos Libertun 1,✉
PMCID: PMC11567486  PMID: 1571952

Abstract

  1. Serum prolactin levels are low during the first 20 days of life and gradually increase toward puberty, in both male and female rats.

  2. There is an age-related increase in the cell population engaged in prolactin secretion, as well as an increase in the synthesis of prolactin and of the amount of prolactin secreted from individual lactotropes.

  3. The gradual increase in prolactin levels in the third week of life is not related to a decrease in dopaminergic inhibition but to an increase in the efficiency of prolactin releasing factors such as estrogen, serotonin, opiates, and posterior pituitary extracts.

  4. Prolactin release induced by physiological factors, such as stress, cervical stimulation, or the expression of spontaneous diurnal and nocturnal surges, requires maturational events within the hypothalamic-pituitary axis which are evident at the end of the third week of life.

  5. In the female rat the steadily increasing levels of prolactin are involved in the timing of puberty eclosion acting at the ovary and at the brain.

  6. In the prepubertal male rat increasing titers of prolactin may be involved in testicular and accessory organ development and may facilitate the actions of luteinizing hormone, follicle stimulating hormone, and testosterone on male sexual organs.

Key words: ontogeny, prolactin, rat, neurotransmitters, sexual differences

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