C-3 Epimers Can Account for a Significant Proportion of Total Circulating 25-Hydroxyvitamin D in Infants, Complicating Accurate Measurement and Interpretation of Vitamin D Status

Vitamin D Deficiency and Secondary Hyperparathyroidism in the Elderly: Consequences for Bone Loss and Fractures and Therapeutic Implications

2001 • 1,911 citations

Vitamin D supplementation, 25-hydroxyvitamin D concentrations, and safety

1999 • 1,500 citations

Prevalence of Vitamin D Insufficiency in an Adult Normal Population

1997 • 1,477 citations

Structure-Function Relationships in the Vitamin D Endocrine System*

1995 • 1,182 citations

Vitamin D in preventive medicine: are we ignoring the evidence?

2003 • 904 citations

Assay Variation Confounds the Diagnosis of Hypovitaminosis D: A Call for Standardization

2004 • 592 citations

Vitamins for Chronic Disease Prevention in Adults

2002 • 497 citations

Determination of vitamin D status by radioimmunoassay with an 125I-labeled tracer

1993 • 439 citations

Structure-function relationships in the vitamin D endocrine system

1995 • 268 citations

Vitamin D and cancer: effects of 1,25(OH)2D3 and its analogs on growth control and tumorigenesis

2001 • 169 citations

Serum Vitamin D₂and Vitamin D₃Metabolite Concentrations and Absorption of Vitamin D₂in Elderly Subjects*

1986 • 159 citations

Improved radioimmunoassay for vitamin D and its use in assessing vitamin D status.

1985 • 139 citations

Measurement of Vitamin D metabolites: an international perspective on methodology and clinical interpretation

2004 • 136 citations

C-3 Epimerization of Vitamin D3 Metabolites and Further Metabolism of C-3 Epimers

2004 • 136 citations

Intestinal Cholecalciferol Absorption in the Elderly and in Younger Adults

1978 • 135 citations

1α,25-Dihydroxy-3-epi-vitamin D3, a natural metabolite of 1α,25-dihydroxy vitamin D3: production and biological activity studies in pulmonary alveolar type II cells

2002 • 127 citations

The measurement of vitamin D: analytical aspects

2004 • 114 citations

Molecular basis of the selective activity of vitamin D analogues

2003 • 110 citations

1Alpha,25-dihydroxy-3-epi-vitamin D3, a natural metabolite of 1alpha,25-dihydroxyvitamin D3, is a potent suppressor of parathyroid hormone secretion.

1999 • 103 citations

1?,25-Dihydroxy-3-Epi-vitamin D3, a natural metabolite of 1?,25-dihydroxyvitamin D3, is a potent suppressor of parathyroid hormone secretion

1999 • 93 citations

Differentiation-Related Pathways of 1α,25-Dihydroxycholecalciferol Metabolism in Human Colon Adenocarcinoma-Derived Caco-2 Cells: Production of 1α,25-Dihydroxy-3epi-cholecalciferol

1998 • 78 citations

1α,25-(OH)2-Vitamin D3Analogs with Minimalin VivoCalcemic Activity Can Stimulate Significant Transepithelial Calcium Transport and mRNA Expressionin Vitro

1996 • 62 citations

Metabolism of 1α,25-dihydroxyvitamin D3 and its C-3 epimer 1α,25-dihydroxy-3-epi-vitamin D3 in neonatal human keratinocytes

2001 • 60 citations

1α,25‐Dihydroxy‐3‐epi‐vitamin D₃: In vivo metabolite of 1α,25‐dihydroxyvitamin D₃ in rats

1999 • 54 citations

Production of 1α,25-Dihydroxy-3-epi-vitamin D3 in two rat osteosarcoma cell lines (UMR 106 and ROS 17/2.8): existence of the C-3 epimerization pathway in ROS 17/2.8 cells in which the C-24 oxidation pathway is not expressed

1999 • 53 citations

Isolation and identification of 1α‐hydroxy‐3‐epi‐vitamin D₃, a potent suppressor of parathyroid hormone secretion

2005 • 53 citations

A sensitive competitive protein binding assay for vitamin D in plasma

1981 • 38 citations

Nonhypercalcemic 1,25-(OH)2D3 analogs potently induce the human osteocalcin gene promoter stably transfected into rat osteosarcoma cells (ROSCO-2)

1991 • 38 citations

Cell specificity and properties of the C-3 epimerization of Vitamin D3 metabolites

2004 • 34 citations

Natural metabolites of 1alpha,25-dihydroxyvitamin D(3) retain biologic activity mediated through the vitamin D receptor.

2000 • 34 citations

Natural metabolites of 1?,25-dihydroxyvitamin D3 retain biologic activity mediated through the vitamin D receptor

2000 • 33 citations

1α,25-Dihydroxy-3-epi-vitamin D3 a physiological metabolite of 1α,25-dihydroxyvitamin D3: Its production and metabolism in primary human keratinocytes

2000 • 33 citations

Vitamin D and cancer effects of 1 25 OH 2D3 and its analogs on growth control and tumorigenesis

2001 • 33 citations

Measurement and characterization of C-3 epimerization activity toward vitamin D3

2005 • 20 citations

The 3-epi- and 24-oxo-derivatives of 1α,25 dihydroxyvitamin D3 stimulate transcription through the vitamin D receptor

2000 • 18 citations

METABOLISM OF INTRAVENOUSLY ADMINISTERED CHOLECALCIFEROL IN MAN

1979 • 12 citations

Metabolites and analogs of 1α,25-dihydroxyvitamin D3: evaluation of actions in bone

2001 • 11 citations