Document Detail

Ontogeny of adenohypophyseal cells in the pituitary of the American shad (Alosa sapidissima).
MedLine Citation:
PMID:  12849969     Owner:  NLM     Status:  MEDLINE    
The distribution and ontogeny of adenohypophyseal cells have been studied in the pituitary gland of embryos, larvae, and juveniles of the clupeid American shad (Alosa sapidissima) using immunocytochemical techniques. In juvenile specimens, adenohypophysis was composed of rostral pars distalis (RPD), formed by cavities lined by prolactin (PRL), adrenocorticotropic hormone (ACTH), and gonadotropic hormone (GTH) cells; proximal pars distalis (PPD), containing growth hormone (GH), GTH, and putative thyroid stimulating hormone (TSH) cells; and pars intermedia (PI) with somatolactin (SL) and melanophore stimulating hormone (MSH) cells. At 3 days post-fertilization (3 days pre-hatching) the pituitary of embryos consisted of an oval mass of cells, close to the ventral margin of the diencephalon, divided in rostral and caudal regions. At this time PRL and ACTH cells appeared in the rostral region of the adenohypophysis, while SL cells were observed in the caudal region where MSH cells showed reactivity 1 day before hatching. At variance, GH cells showed a weak immunoreactivity in the rostral portion at hatching that increased 2 days latter. GTH cells also showed weak immunoreactivity in the rostral region of the adenohypophysis at hatching time. Two days later GTH cells were located in the rostral and central regions of the adenohypophysis. At hatching, the neurohypophysis was very small and no nerve processes were seen to penetrate the adenohypophysis tissue. After hatching, the pituitary gland elongated and in 7 days old larvae, the RPD showed a small lumen surrounded by a palisade of PRL, ACTH, and GHT cells; the PPD showed GH and GTH cells while the PI contained SL and MSH cells. The adenohypophysis and neural lobe increased in size with development and, in 42 days old larvae, they were similar to those of juvenile specimens.
Raul Laiz-Carrión; María del Mar Segura-Noguera; María del Pilar Martín del Río; Juan Miguel Mancera
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  General and comparative endocrinology     Volume:  132     ISSN:  0016-6480     ISO Abbreviation:  Gen. Comp. Endocrinol.     Publication Date:  2003 Jul 
Date Detail:
Created Date:  2003-07-09     Completed Date:  2003-10-07     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370735     Medline TA:  Gen Comp Endocrinol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  454-64     Citation Subset:  IM    
Departamento de Biología, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, Puerto Real, Cádiz 11510, Spain.
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MeSH Terms
Adrenocorticotropic Hormone / metabolism
Aging / physiology*
Embryo, Nonmammalian / anatomy & histology*,  metabolism
Fish Proteins
Fishes / anatomy & histology*,  metabolism
Glycoproteins / metabolism
Gonadotropins / metabolism
Growth Hormone / metabolism
Larva / anatomy & histology*,  metabolism
Melanocyte-Stimulating Hormones / metabolism
Pituitary Gland, Anterior / cytology*,  secretion
Pituitary Hormones / metabolism
Prolactin / metabolism
Thyrotropin / metabolism
Reg. No./Substance:
0/Fish Proteins; 0/Glycoproteins; 0/Gonadotropins; 0/Pituitary Hormones; 0/somatolactin protein, fish; 9002-60-2/Adrenocorticotropic Hormone; 9002-62-4/Prolactin; 9002-71-5/Thyrotropin; 9002-72-6/Growth Hormone; 9002-79-3/Melanocyte-Stimulating Hormones

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