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https://hdl.handle.net/2440/44323
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Type: | Journal article |
Title: | Determination of Vitamin D-dependent calcium absorption by ⁴⁵Ca gavage in the rat |
Other Titles: | Determination of Vitamin D-dependent calcium absorption by (45)Ca gavage in the rat |
Author: | Larik, R. Morris, H. O'Loughlin, P. |
Citation: | The Journal of Steroid Biochemistry and Molecular Biology, 2007; 103(3-5 Sp Iss):517-520 |
Part of: | 13th Workshop on Vitamin D (Victoria, British Columbia, Canada, April 2006) / edited by R. Bouillon, A.W. Norman and J.R. Pasqualini |
Publisher: | Pergamon-Elsevier Science Ltd |
Issue Date: | 2007 |
ISSN: | 0960-0760 1879-1220 |
Statement of Responsibility: | Rogier Larik, Howard A. Morris and Peter D. O’Loughlin |
Abstract: | Precise determination of Vitamin D-dependent intestinal calcium absorption in longitudinal studies is problematic. We have assessed Vitamin D-dependent intestinal calcium absorption by (45)Ca gavage. Rats were gavaged with a 1mL solution containing (45)Ca (CaCl(2), 9.3MBq/mL) maintained at 37 degrees C. Total Ca concentration of the gavage fluid was optimised by comparing the absorption curves for fluids made up to 0.025, 2.025, 4.025 and 40.025 mmol/L with (40)CaCl(2). The effect of varying dietary Ca on fractional Ca absorption was determined in rats fed semi-synthetic diets containing either 0.05%, 0.2%, 0.4% or 1.0% Ca for 50 days. Serum 1,25 dihydroxyvitamin D (1,25D) was determined by radioimmunoassay. Total gavage Ca of 0.025 mmol/L achieved the highest peak fractional absorption and was adopted for all future experiments. Fifty days after allocation to the diets both fractional Ca absorption and 1,25D were highest in rats fed 0.05% Ca and lowest in those fed 1.0% Ca (absorption, P<0.05 and 1,25D, P<0.05). There was a strong logarithmic relationship between 1,25D and fractional Ca absorption (R(2) 0.69, P<0.001). Weekly repetition of the procedure did not cause a fall in haematocrit over 7 weeks. Radiocalcium ((45)Ca) absorption by gavage provides a simple measure of Vitamin D-dependent Ca absorption for repetitive use in longitudinal studies. |
Keywords: | Animals Rats Rats, Sprague-Dawley Calcium Calcium Radioisotopes Hydroxycholecalciferols Diet Female |
Description: | Copyright © 2007 Elsevier Ltd All rights reserved. |
DOI: | 10.1016/j.jsbmb.2006.11.015 |
Description (link): | http://www.elsevier.com/wps/find/journaldescription.cws_home/333/description#description |
Published version: | http://dx.doi.org/10.1016/j.jsbmb.2006.11.015 |
Appears in Collections: | Aurora harvest 6 Molecular and Biomedical Science publications |
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