The effect of thyroxine administration on intestinal calcium absorption and calcium binding protein activity in the chick

1975 ◽  
Vol 17 (3) ◽  
pp. 257-261 ◽  
Author(s):  
R. Swaminathan ◽  
A. D. Care
Keyword(s):  
Calcium Binding ◽  
Calcium Absorption ◽  
Binding Protein ◽  
Calcium Binding Protein ◽  
Intestinal Calcium Absorption ◽  
Protein Activity

Influence of calcium-binding protein in bovine milk on intestinal calcium absorption

1988 ◽  
Vol 6 (3) ◽  
pp. 38-43 ◽  
Author(s):  
Tsuneyuki Oku ◽  
Michiko Tatsuno-Yoshioka ◽  
Norimasa Hosoya
Keyword(s):  
Calcium Binding ◽  
Calcium Absorption ◽  
Binding Protein ◽  
Bovine Milk ◽  
Calcium Binding Protein ◽  
Intestinal Calcium Absorption

ROLE OF THE PARATHYROID GLANDS IN THE ENHANCEMENT OF INTESTINAL CALCIUM ABSORPTION IN RESPONSE TO A LOW CALCIUM DIET

1977 ◽  
Vol 74 (3) ◽  
pp. 345-354 ◽  
Author(s):  
J. FOX ◽  
R. SWAMINATHAN ◽  
T. M. MURRAY ◽  
A. D. CARE
Keyword(s):  
Small Intestine ◽  
Calcium Binding ◽  
Calcium Absorption ◽  
Binding Protein ◽  
Calcium Binding Protein ◽  
Intestinal Calcium Absorption ◽  
Parathyroid Glands ◽  
Calcium Diet ◽  
Low Calcium Diet ◽  
Low Calcium

SUMMARY The phenomenon of adaptation of intestinal calcium absorption to changes in dietary calcium has been studied in conscious pigs with Thiry–Vella jejunal loops. The result of decreasing the calcium content of the diet from 1·2 to 0·1% was an increase in the efficiency of the net absorption of calcium from the fluid used to perfuse the jejunal loop; this increase took place 4–6 days after the change in diet. A similar effect was noted in four pigs which had previously been parathyroidectomized and in two thyroparathyroidectomized pigs with thyroxine replacement therapy. The effect seen in the parathyroidectomized animals was not attributable to an increase in the concentration gradient of calcium ions between the jejunal lumen and the blood after the change to the low calcium diet. There was a marked increase in the amount of calcium-binding protein in the mucosa taken from the distal three-quarters of the small intestine of intact pigs fed a low calcium diet. However, after parathyroidectomy, the level of calcium in the diet had no significant effect on the amount of calcium-binding protein in the small intestine. It is concluded that, in pigs, neither parathyroid hormone nor calcitonin is necessary for intestinal adaptation to a low calcium diet and that, although this adaptation may be mediated by 1,25-dihydroxycholecalciferol, a significant increase in the level of calcium-binding protein in the intestine is only seen when the parathyroid glands are intact.

EFFECT OF LOW PHOSPHORUS DIETS ON INTESTINAL CALCIUM ABSORPTION AND THE CONCENTRATION OF CALCIUM-BINDING PROTEIN IN INTACT AND PARATHYROIDECTOMIZED PIGS

1978 ◽  
Vol 78 (3) ◽  
pp. 379-387 ◽  
Author(s):  
J. FOX ◽  
D. W. PICKARD ◽  
A. D. CARE ◽  
T. M. MURRAY
Keyword(s):  
Small Intestine ◽  
Intestinal Absorption ◽  
Calcium Binding ◽  
Calcium Absorption ◽  
Binding Protein ◽  
Calcium Binding Protein ◽  
Intestinal Calcium Absorption ◽  
Jejunal Loop ◽  
Dietary Concentration ◽  
Low Phosphorus

The effect of changing the dietary concentration of phosphorus on the intestinal absorption of calcium has been studied in conscious pigs each prepared with a Thiry–Vella loop of jejunum. A reduction in the percentage of phosphorus in the diet from 0·7 to 0·3% caused an increase in the efficiency of absorption of calcium from the fluid used to perfuse the jejunal loop in both intact and parathyroidectomized animals. There was a marked increase in the amount of calcium-binding protein (CaBP) in the small intestine of pigs fed the low phosphorus diet. Parathyroidectomy did not affect the amount of CaBP in the small intestine when either the normal or the low phosphorus diets were fed.

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