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Titolo:
Thyroxine and vitamin D in the gorgonian Leptogorgia virgulata
Autore:
Kingsley, RJ; Corcoran, ML; Krider, KL; Kriechbaum, KL;
Indirizzi:
Univ Richmond, Dept Biol, Richmond, VA 23173 USA Univ Richmond Richmond VA USA 23173 nd, Dept Biol, Richmond, VA 23173 USA
Titolo Testata:
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR AND INTEGRATIVE PHYSIOLOGY
fascicolo: 4, volume: 129, anno: 2001,
pagine: 897 - 907
SICI:
1095-6433(200107)129:4<897:TAVDIT>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
THYROID-HORMONES; METABOLISM; BONE; RESORPTION; GORGONACEA; ORIGIN; FISH;
Keywords:
calcification; gorgonian; invertebrate; Leptogorgia virgulata (Cnidaria); protein-bound iodine; spicule; thyroxine; vitamin D;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Kingsley, RJ Univ Richmond, Dept Biol, Richmond, VA 23173 USA Univ Richmond Richmond VA USA 23173 , Richmond, VA 23173 USA
Citazione:
R.J. Kingsley et al., "Thyroxine and vitamin D in the gorgonian Leptogorgia virgulata", COMP BIOC A, 129(4), 2001, pp. 897-907

Abstract

The gorgonian coral Leptogorgia virgulata contains thyroxine, or a thyroxine-like substance. referred to here as G-T-4. The G-T-4 levels were significantly higher in colonies collected in the summer vs. winter months. Using immunocytochemical techniques, G-T-4 was localized in the axis, polyp epithelium, and within the electron dense bodies of scleroblasts (spicule-forming cells), as well as on the periphery of spicules. G-T-4 was also localizedin the mesoglea between closely adjacent scleroblasts. The effects of exogenous T-4 on the uptake of Ca-45 was determined in spicule, tissue and axisfractions of L. virgulata. The uptake of Ca-45 increased in T-4 treated spicules but decreased in the tissue fraction for all time periods tested. The uptake of Ca-45 into axes was not affected by exogenous T-4 until day 10 of the study. These data suggest that G-T-4 may function in the process of spicule formation. 1,25-dihydroxyvitamin D apparently is synthesized via ultraviolet radiation. Colonies deprived of ultraviolet radiation had significantly more 'irregular' spicules than colonies maintained in ultraviolet radiation. Exposure to sunlight therefore may be associated with the process of normal spicule formation. (C) 2001 Elsevier Science Inc. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/04/20 alle ore 07:36:25