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Titolo:
Morphological and biochemical changes in the thyroid gland of the lizard Podarcis sicula (Reptilia, Squamata) induced by VIP treatment
Autore:
Virgilio, F; Sciarrillo, R; Laforgia, V; Cavagnuolo, A; De Falco, M; Varano, L;
Indirizzi:
Univ Naples Federico II, Dipartimento Biol Evolut & Comparata, I-80134 Naples, Italy Univ Naples Federico II Naples Italy I-80134 rata, I-80134 Naples, Italy
Titolo Testata:
ITALIAN JOURNAL OF ZOOLOGY
fascicolo: 3, volume: 68, anno: 2001,
pagine: 181 - 186
SICI:
1125-0003(2001)68:3<181:MABCIT>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
VASOACTIVE-INTESTINAL-PEPTIDE; HORMONE SECRETION; BLOOD-FLOW; NERVES; OCTACOSAPEPTIDE; LOCALIZATION; POLYPEPTIDE; GLUCAGON; PLASMA; RAT;
Keywords:
VIP; thyroid gland; Podarcis sicula; reptiles;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Virgilio, F Univ Naples Federico II, Dipartimento Biol Evolut & Comparata,Via Mezzocannone 8, I-80134 Naples, Italy Univ Naples Federico II Via Mezzocannone 8 Naples Italy I-80134
Citazione:
F. Virgilio et al., "Morphological and biochemical changes in the thyroid gland of the lizard Podarcis sicula (Reptilia, Squamata) induced by VIP treatment", ITAL J ZOOL, 68(3), 2001, pp. 181-186

Abstract

The effects of exogenous vasoactive intestinal polypeptide (VIP) involvement in the regulation of thyroid function were detected in the lizard Podarcis sicula. Variations in thyroid gland morphology, thyroid-stimulating hormone (TSH), 3,5,3'-triiodo-L-thyronine (T3) and L-thyroxine (T4) plasma levels, were studied in this species after treatment with VIP, during winter and summer. The polypeptide had a stimulatory effect on thyroid hormone secretion throughout the year. Plasma T4 and T3 levels significantly increased; maximal values were reached in specimens exposed longer to treatment. No difference in plasma TSH levels was observed between control and treated specimens, indicating that, in P. sicula, the site of VIP action might be better identified at thyroidal rather than hypophyseal level. Consistently with these results, the morphology of the thyroid gland also appeared stimulatedafter treatment with VIP, showing an increase in thyroid-cell height, numerous intracellular colloid droplets PAS-positive, and enlarged blood vessels around the follicles.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 10:46:46