Circadian changes in prolactin cell activity in the pituitary of the teleost Poecilia latipinna in freshwater

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)267-280
Number of pages14
JournalCell and Tissue Research
Issue number2
Publication statusPublished - Jan 1976
Externally publishedYes
Quantitative morphometric studies with the electron microscope were made on the prolactin cells of wild freswater sailfin mollies taken in Florida in August at four different times of day. The results indicate a circadian rhythm in the prolactin cell, the period of highest synthetic activity being from midday to evening, as indicated by the condition of nucleus, Golgi apparatus and rough endoplasmic reticulum, and by the incidence of granule release profiles. No circadian changes were detected in the ACTH cells. Several distinct sites of prolactin granule release were recognised. However, there was no conclusive evidence of granule release by any mechanism other than classical exocytosis.

    Research areas

  • Prolactin cell, Poecilia latipinna, Circadian changes, Morphometry

External organisations

  • University of Florida
  • University of Sheffield

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