Vitamin D Metabolism in Chronic Kidney Disease Patients

1. Patients in the Memphis VA Medical Center with documented vitamin D deficiency, determined by measurements of 25(OH)D3, were recruited for this study. 25(OH)D3 measurements are commonly obtained during routine clinical care in both primary care and nephrology clinics. Patient with a wide range of kidney function, ranging from normal estimated glomerular filtration rate (e GFR) to patients with stage III and V (CKD) (estimated GFR \<60 ml/min) were recruited treated with weekly oral administration of 10,000 IU of cholecalciferol for a total of 8 weeks in order to correct the vitamin D deficiency. 2. Data collected: Baseline characteristics including demographics, laboratory data obtained at primary care clinic visits, clinical data from the VAMC medical record and medications were obtained at the time of inclusion into the study. Serum concentrations of FGF23, 25(OH)D, 1,25 dihydroxyvitamin D(1,25 (OH)₂D), 24,25 dihydroxyvitamin D(24,25(OH)₂D) ,intact parathyroid hormone (PTH), Calcium, Phosphorous and creatinine and urinary concentrations of calcium, phosphate and creatinine from 24 hr urine collections were obtained at the time of inclusion into the study and after 8 weeks of weekly cholecalciferol therapy. Serum and buffy coats which were recollected from dialysis patient's who agreed to participate, were used to measure mRNA levels of FGF-23, CPY27B1 and Cyp 24 expression. 3. Methods utilized in analyzing and interpreting the data Descriptive statistics will be performed to compare serum and urinary measurements before and after cholecalciferol therapy. Associations between estimated glomerular filtration rate and levels of vitamin D metabolites and FGF23, before and after treatment, will also be evaluated. The mRNA expression of FGF-23, CPY27B1 and Cyp 24 will be measured in a subset of dialysis patients who completed the treatment course and agreed to provide the additional samples. 4. Duration of the project: 1 year.