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Vitamin D3-induced calcium binding protein in bone tissue
Science (New York, N.Y.)
|October 6, 1978
Summary
Vitamin D3 significantly increases bone calcium binding protein (CaBP) in chicks, with bone CaBP being larger and responding to dietary calcium levels. This finding highlights vitamin D
Area of Science:
- Biochemistry
- Molecular Biology
- Nutritional Science
Background:
- Calcium binding protein (CaBP) is crucial for calcium transport.
- Vitamin D is essential for calcium homeostasis.
- Rickets is a condition caused by vitamin D deficiency.
Purpose of the Study:
- To investigate the effect of vitamin D3 on bone calcium binding protein (CaBP) in rachitic chicks.
- To characterize the properties of bone CaBP and its response to dietary calcium.
Main Methods:
- Radioimmunoassay (RIA) was used to detect and quantify immunoreactive CaBP.
- Molecular weight determination was performed.
- Localization of CaBP within chick tibia was analyzed.
Main Results:
- Vitamin D3 administration led to a 25- to 100-fold increase in bone CaBP.
- Bone CaBP (approx. 34,000 daltons) is larger than intestinal CaBP (28,000 daltons).
- Bone CaBP concentration in tibia was highest in spongiosa and cartilage plate regions and varied with dietary calcium.
Conclusions:
- Vitamin D3 stimulates the synthesis of bone CaBP in rachitic chicks.
- Bone CaBP exhibits distinct molecular weight and localization compared to intestinal CaBP.
- Bone CaBP levels are regulated by both vitamin D and dietary calcium intake.