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Titolo:
Androgen receptors and sexual dimorphisms in the larynx of the bullfrog
Autore:
Boyd, SK; Wissing, KD; Heinsz, JE; Prins, GS;
Indirizzi:
Univ Notre Dame, Dept Biol Sci, Notre Dame, IN 46556 USA Univ Notre Dame Notre Dame IN USA 46556 iol Sci, Notre Dame, IN 46556 USA Univ Illinois, Dept Urol, Chicago, IL 60612 USA Univ Illinois Chicago IL USA 60612 nois, Dept Urol, Chicago, IL 60612 USA
Titolo Testata:
GENERAL AND COMPARATIVE ENDOCRINOLOGY
fascicolo: 1, volume: 113, anno: 1999,
pagine: 59 - 68
SICI:
0016-6480(199901)113:1<59:ARASDI>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
XENOPUS-LAEVIS; MUSCLE-FIBERS; ACOUSTIC COMMUNICATION; CALLING MUSCLES; MESSENGER-RNA; RANA; MORPHOLOGY; FROGS; TESTOSTERONE; EVOLUTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
61
Recensione:
Indirizzi per estratti:
Indirizzo: Boyd, SK Univ Notre Dame, Dept Biol Sci, Notre Dame, IN 46556 USA Univ Notre Dame Notre Dame IN USA 46556 Notre Dame, IN 46556 USA
Citazione:
S.K. Boyd et al., "Androgen receptors and sexual dimorphisms in the larynx of the bullfrog", GEN C ENDOC, 113(1), 1999, pp. 59-68

Abstract

As in most anuran amphibians, both male and female bullfrogs (Rana catesbeiana) vocalize. Sex differences in vocalizations in the bullfrog may be dueto sex differences in the larynx. We examined the laryngeal muscle to determine whether it possessed androgen receptors and whether there were morphological sexual dimorphisms in the larynx. Using a polyclonal antibody and immunocytochemistry, we found androgen receptors in the laryngeal dilator muscle of both sexes. Males possessed approximately 13% more receptor-positive muscle nuclei than females. We also stained the dilator muscle for the presence of succinate dehydrogenase. Density of staining for the enzyme was significantly greater in male muscle than in female muscle, indicating greater oxidative capacity of muscle in males. This procedure also showed both asignificantly greater cross-sectional area for the dilator muscle in malesand a greater area for individual fibers. Male muscle consisted almost entirely of fast-twitch oxidative/glycolytic fibers. Female muscle contained amixture of fast-twitch glycolytic fibers and two subclasses of fast-twitchoxidative/glycolytic fibers. Finally both the length and width of the entire laryngeal complex and the length and width of the dilator were significantly greater in males than in females. In summary, laryngeal muscle of bullfrogs possessed androgen receptors and is thus likely to be androgen sensitive. Androgens, during development or at adulthood, may be responsible for the anatomic and enzymatic sexual dimorphisms in the larynx. (C) 1999 Academic Press.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 23:38:58