PMID: 6313471Oct 1, 1983Paper

Ultrastructural changes in the adenohypophysis during the ovarian cycle of the viviparous teleost Poecilia latipinna. III. The growth hormone, adrenocorticotrophic, and prolactin cells and the pars intermedia

General and Comparative Endocrinology
G Young, J N Ball

Abstract

During the monthly cycle of vitellogenesis, intraovarian gestation, and parturition, the pituitary growth hormone (GH) cells show ultrastructural changes indicative of an increase in secretory activity related to vitellogenesis. In contrast, the pituitary adrenocorticotrophic (ACTH) cells are relatively inactive during vitellogenesis, but become active during late pregnancy in the few days before parturition. The prolactin cells and the two cell types of the pars intermedia do not appear to change their secretory activity during the cycle. In discussing these findings it is suggested that GH may play a metabolic role related to vitellogenesis, and that corticosteroids, secreted in response to elevated output of ACTH, may facilitate follicular rupture and/or the expulsion of the brood at the end of pregnancy.

References

Aug 18, 1975·Cell and Tissue Research·T BattenM Benjamin
Oct 1, 1979·General and Comparative Endocrinology·J N Fryer
Jul 1, 1979·Journal of Steroid Biochemistry·B I SundararajV Lamba
Nov 1, 1979·General and Comparative Endocrinology·M Olivereau, J Olivereau
May 1, 1977·General and Comparative Endocrinology·B I Sundararaj, S V Goswami

Citations

Sep 18, 2003·General and Comparative Endocrinology·G DeganiK Jackson
Nov 25, 1998·Comparative Biochemistry and Physiology. Part C, Pharmacology, Toxicology & Endocrinology·P MelamedZ Yaron

Related Concepts

Corticotropin
Cell Nucleus
Ovary
Periodicity
Pituitary Gland, Anterior
Pregnancy, Animal
Prolactin
Recombinant Growth Hormone
Thyrotropin
Vitellogenesis

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