Document Detail

Histological, immunohistochemical and pathological features of the pituitary gland of odontocete cetaceans from the Western gulf of Mexico.
MedLine Citation:
PMID:  18621384     Owner:  NLM     Status:  MEDLINE    
Pituitary glands were recovered from dolphins and small whales found stranded along the Texas coast of the Gulf of Mexico over a 15-year period (1991-2006). One hundred animals of 14 species were found to be suitable for inclusion in this study. Of these, 72 were Atlantic bottlenose dolphins (Tursiops truncatus). Other species included were the melon-headed whale (Peponocephala electra), spinner dolphin (Stenella longirostris), striped dolphin (Stenella coeruleoalba), pantropical spotted dolphin (Stenella attenuata), pygmy sperm whale (Kogia breviceps), dwarf sperm whale (Kogia sima), Risso's dolphin (Grampus griseus), the short finned pilot whale (Globicephala macrorhyncha), false killer whale (Pseudorca crassidens), Fraser's dolphin (Lagenorhynchus hosei), rough-tooth dolphin (Steno bredanensis), Gervais's beaked whale (Mesoplodon europaeus) and an infant sperm whale (Physeter catodon). The pituitary weights in T. truncatus ranged from 0.69 g in a 109-cm long neonate to 3.44 g in a large (277 cm) male. More typical weights were in the range of 0.95-2.35 g (mean=1.65+/-0.70 g) The cetacean pituitary consisted of two distinct parts, the adenohypophysis and the neurohypophysis, which were separated by a thin fibrous membrane in all species examined, in contrast to terrestrial mammals in which the parts are apposed and joined through a pars intermedia. Cell types were identified with conventional stains and immunohistochemistry. Cells positive for adrenocorticotropic hormone, follicle stimulating hormone, growth hormone, melanocyte stimulating hormone, luteinizing hormone and prolactin were identified with appropriate antibodies. Lesions, which were few, included one pituicytoma of the pars nervosa and a squamous cyst in T. truncatus, and colloid cysts in several species. Nodular aggregates of single cell types were common, probably representing a physiological variant.
D F Cowan; E M Haubold; Y Tajima
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2008-07-14
Journal Detail:
Title:  Journal of comparative pathology     Volume:  139     ISSN:  0021-9975     ISO Abbreviation:  J. Comp. Pathol.     Publication Date:    2008 Aug-Oct
Date Detail:
Created Date:  2008-08-15     Completed Date:  2008-11-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0102444     Medline TA:  J Comp Pathol     Country:  England    
Other Details:
Languages:  eng     Pagination:  67-80     Citation Subset:  IM    
Department of Pathology and The Marine Biomedical Institute, University of Texas Medical Branch, Galveston, TX, USA.
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MeSH Terms
Dolphins / anatomy & histology*,  metabolism
Pituitary Diseases / pathology,  veterinary*
Pituitary Gland / anatomy & histology*,  metabolism*
Whales / anatomy & histology*,  metabolism

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