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Titolo:
THE EFFECT OF CALCIUM-REGULATING HORMONES ON TRANSPORT OF CALCIUM ACROSS THE CHORIOALLANTOIC MEMBRANE OF THE CHICKEN-EMBRYO
Autore:
PACKARD MJ; CLARK NB; ERICKSON JP;
Indirizzi:
COLORADO STATE UNIV,DEPT BIOL FT COLLINS CO 80523 UNIV CONNECTICUT,DEPT PHYSIOL & NEUROBIOL STORRS CT 06269
Titolo Testata:
Comparative biochemistry and physiology. Part A, Molecular & integrative physiology
fascicolo: 2, volume: 119, anno: 1998,
pagine: 547 - 552
SICI:
1095-6433(1998)119:2<547:TEOCHO>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
VITAMIN-D DEFICIENCY; CARBONIC-ANHYDRASE ACTIVITY; YOLK-SAC MEMBRANE; PARATHYROID-GLANDS; BINDING-PROTEIN; METABOLITES; 1,25-DIHYDROXYVITAMIN-D3; INVITRO; SODIUM; INVIVO;
Keywords:
CALCIUM TRANSPORT; CHICKEN EMBRYO; PARATHYROID HORMONE; VITAMIN D;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
49
Recensione:
Indirizzi per estratti:
Citazione:
M.J. Packard et al., "THE EFFECT OF CALCIUM-REGULATING HORMONES ON TRANSPORT OF CALCIUM ACROSS THE CHORIOALLANTOIC MEMBRANE OF THE CHICKEN-EMBRYO", Comparative biochemistry and physiology. Part A, Molecular & integrative physiology, 119(2), 1998, pp. 547-552

Abstract

The hormonal form of vitamin D-3 (1,25(OH)(2)D-3), parathyroid hormone (PTH), or appropriate vehicle were injected into the yolk sac of eggs of domestic fowl on days 16 and 17 of incubation. The chorioallantoic membrane (CAM) and overlying inner shell membrane were removed from eggs on day 18 and mounted in a Ussing-type apparatus. Transport of calcium was assessed by monitoring movements of radiolabeled calcium. Transport of calcium from the chorionic aspect of the CAM to the allantoic aspect increased considerably with time for all treatment groups except the one receiving PTH. ''Back-flux'' of calcium (movement of calcium from the allantoic aspect to the chorionic) was negligible for alltreatment groups at all sampling periods. PTH treatment did not affect flux of calcium from allantois to chorion but reduced flux from chorion to allantois considerably. The underlying cause of this effect hasnot been identified. The hormonal form of vitamin D, did not affect flux of calcium in either direction. These data raise the possibility that control of calcium transport by the CAM may not be the primary function of the vitamin D hormone. (C) 1998 Elsevier Science Inc.

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Documento generato il 12/07/20 alle ore 08:39:27