Vitamin D-dependent intestinal calcium absorption
نویسندگان
چکیده
منابع مشابه
Role of vitamin D-dependent and vitamin D-independent mechanisms in absorption of food calcium.
We measured net calcium absorption and the calcium content of the digestive glands secretions in people with widely different serum concentrations of 1,25 dihydroxy vitamin D (hereafter referred to a 1,25-D). Patients with end stage renal disease on hemodialysis served as a model of human 1,25-D deficiency; they were also studied when they had abnormally high serum 1,25-D concentrations as a re...
متن کاملIntestinal membrane calcium-binding protein. Vitamin D-dependent membrane component of the intestinal calcium transport mechanism.
A particulate fraction of rat intestinal mucosal homogenates, termed the "calcium-binding complex," contains three vitamin D-dependent activities: calcium binding of high affinity, calcium-dependent adenosine triphosphatase, and p-nitrophenylphosphatase. These particulate activities vary concordantly with intestinal calcium transport, suggesting that they represent membrane components of the tr...
متن کاملEffects of vitamin D metabolites on intestinal calcium absorption and bone turnover in elderly women.
BACKGROUND The relative importance of vitamin D metabolites in the regulation of gut calcium absorption has not been well studied in elderly women living in an environment with abundant sunlight. OBJECTIVE The objective was to examine the determinants of active gut calcium absorption ( +/- SD: 42 +/- 11%) after an overnight fast with the use of a low (10 mg) calcium load. DESIGN One hundred...
متن کاملSerum vitamin D metabolites and intestinal calcium absorption efficiency in women.
BACKGROUND Vitamin D sufficiency may be determined by the serum concentration of 25-hydroxyvitamin D [25(OH)D] that results in maximal intestinal calcium absorption efficiency. However, some investigators questioned whether 25(OH)D concentrations above the concentrations associated with rickets or osteomalacia influence calcium absorption. OBJECTIVE We determined whether calcium absorption ef...
متن کاملVitamin D-dependent Calcium-binding Protein
A method of purification of a vitamin D-dependent calciumbinding protein from chick intestinal mucosa is described. The purification procedure involved the use of ammonium sulfate precipitation, gel filtration on Sephadex G-100, and preparative disc electrophoresis. The assay system for calcium-binding protein is based upon the competition between calcium-binding protein and an ion exchange res...
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ژورنال
عنوان ژورنال: Gastroenterology
سال: 1979
ISSN: 0016-5085
DOI: 10.1016/0016-5085(79)90352-4