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The response of 25-hydroxycholecalciferol-1-hydroxylase activity, intestinal calcium absorption, and calcium-binding protein to phosphate deficiency in chicks
Year:
1977
Authors :
Bär, Arie
;
.
Hurvitz, Shmuel (Animal science)
;
.
Montecuccoli, Giulia
;
.
Riesenfeld, Gad
;
.
Volume :
57
Co-Authors:
Montecuccoli, G., Institute of Animal Science, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel
Bar, A., Institute of Animal Science, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel
Risenfeld, G., Institute of Animal Science, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel
Hurwitz, S., Institute of Animal Science, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel
Facilitators :
From page:
331
To page:
334
(
Total pages:
4
)
Abstract:
In two breeds of chicks. White Leghorn and White Rock, phosphate deficiency resulted in an increase in duodenal 47Ca absorption and calcium-binding protein (CaBP). Similar changes were observed in calcium-deficient chicks. No change was noted in the activity of 25-hydroxycholecalciferol-1-hydroxylase in the kidney in phosphate-deficient chicks, whereas a large increase in the activity of the enzyme occurred as a result of calcium restriction. During phosphate restriction, plasma inorganic phosphorus decreased continuously, plasma calcium increased, and body weight decreased. Slight changes were noted in the activity of 25-hydroxycholecalciferol-1-hydroxylase during 15 days of phosphate restriction. Concentration of CaBP in the intestinal mucosa reached a peak after ten days of phosphate restriction, followed by a decline. Switchback experiments indicated no inhibitory action on the activity of 25-HCC-1-hydroxylase by supernatants from phosphorus-deficient chicks. It is concluded that changes in calcium absorption due to phosphate deficiency are not associated with the modulation of the activity of kidney 25-hydroxycholecalciferol-1-hydroxylase, as measured in vitro. © 1977.
Note:
Related Files :
25 hydroxycolecalciferol hydroxylase
calcium
calcium binding protein
chicken
in vitro study
Model
phosphoric acid
theoretical study
Show More
Related Content
More details
DOI :
10.1016/0300-9629(77)90201-8
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
23512
Last updated date:
21/08/2022 07:45
Creation date:
17/04/2018 00:00
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Scientific Publication
The response of 25-hydroxycholecalciferol-1-hydroxylase activity, intestinal calcium absorption, and calcium-binding protein to phosphate deficiency in chicks
57
Montecuccoli, G., Institute of Animal Science, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel
Bar, A., Institute of Animal Science, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel
Risenfeld, G., Institute of Animal Science, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel
Hurwitz, S., Institute of Animal Science, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel
The response of 25-hydroxycholecalciferol-1-hydroxylase activity, intestinal calcium absorption, and calcium-binding protein to phosphate deficiency in chicks
In two breeds of chicks. White Leghorn and White Rock, phosphate deficiency resulted in an increase in duodenal 47Ca absorption and calcium-binding protein (CaBP). Similar changes were observed in calcium-deficient chicks. No change was noted in the activity of 25-hydroxycholecalciferol-1-hydroxylase in the kidney in phosphate-deficient chicks, whereas a large increase in the activity of the enzyme occurred as a result of calcium restriction. During phosphate restriction, plasma inorganic phosphorus decreased continuously, plasma calcium increased, and body weight decreased. Slight changes were noted in the activity of 25-hydroxycholecalciferol-1-hydroxylase during 15 days of phosphate restriction. Concentration of CaBP in the intestinal mucosa reached a peak after ten days of phosphate restriction, followed by a decline. Switchback experiments indicated no inhibitory action on the activity of 25-HCC-1-hydroxylase by supernatants from phosphorus-deficient chicks. It is concluded that changes in calcium absorption due to phosphate deficiency are not associated with the modulation of the activity of kidney 25-hydroxycholecalciferol-1-hydroxylase, as measured in vitro. © 1977.
Scientific Publication
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