| Intratesticular hormone levels and the route of secretion of hormones from the testis of the rat, guinea pig, monkey and human. | |
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MedLine Citation:
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PMID: 8262660 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Blood samples were obtained from the testes of rats, guinea pigs and Macaque monkeys and from normal men undergoing vasectomy reversal, in order to assess the comparative dynamics of hormone secretion. In each species, blood was sampled from a vein on the surface of the testis (testicular venous blood, TV), from a vein in the spermatic cord above the pampiniform plexus (spermatic venous blood, SV) and from a vein elsewhere in the body (peripheral venous blood, PV). Plasma concentrations of testosterone and inhibin were then determined by radioimmunoassay. In all species, testosterone secretion profiles were comparable, with concentrations being greatest in TV blood. SV concentrations were reduced by 40-60% compared with TV levels, with a significantly greater reduction in PV levels. Inhibin secretion varied significantly between species, with the rat being the only animal to show significant increases in inhibin concentrations from TV to SV blood. Inhibin secretion in the guinea pig was most comparable with that of the rat, although the increased SV levels fell short of being significant. Macaque and human profiles contrasted with those of the rat and guinea pig, with the greatest inhibin concentrations being found in TV blood. Levels in SV blood were reduced by some 40%, and PV levels were reduced significantly further. These differences may be due to the different position of the rete testis, and its relationship to the testicular vasculature, in these species. The sampling procedure described provides a defined set of testicular blood samples that could contribute important information of relevance to physiological and clinical studies of testicular function.(ABSTRACT TRUNCATED AT 250 WORDS) |
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Authors:
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S Maddocks; T B Hargreave; K Reddie; H M Fraser; J B Kerr; R M Sharpe |
Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: International journal of andrology Volume: 16 ISSN: 0105-6263 ISO Abbreviation: Int. J. Androl. Publication Date: 1993 Aug |
Date Detail:
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Created Date: 1994-01-21 Completed Date: 1994-01-21 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8000141 Medline TA: Int J Androl Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 272-8 Citation Subset: IM |
Affiliation:
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MRC Reproductive Biology Unit, Centre for Reproductive Biology, Edinburgh, Scotland. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Animals Guinea Pigs Humans Inhibins / blood, metabolism*, secretion Macaca Male Rats Rats, Sprague-Dawley Species Specificity Testis / blood supply, metabolism*, secretion Testosterone / blood, metabolism*, secretion |
| Chemical | |
Reg. No./Substance:
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57285-09-3/Inhibins; 58-22-0/Testosterone |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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