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Effect of calcitriol on bone turnover and osteocalcin in recent-onset type 1 diabetes.

PloS one (2013-02-26)
Nicola Napoli, Rocky Strollo, Dario Pitocco, Carla Bizzarri, Ernesto Maddaloni, Daria Maggi, Silvia Manfrini, Ann Schwartz, Paolo Pozzilli
ABSTRACT

Vitamin D supplementation in childhood improves the achievement of peak bone mass. We investigated the effect of supplementation with calcitriol on bone turnover in recent-onset type 1 diabetes (T1D). Moreover, the association between osteocalcin and parameters of β-cell function and metabolic control was examined. We conducted a post-hoc analysis of a double-blind, placebo-controlled study of calcitriol supplementation to preserve β-cell function. 27 recent-onset T1D subjects, mean age 22 years, were randomized to 0.25 µg calcitriol per day or placebo (1:1) and followed up for one year. Changes in bone formation (osteoclacin) and resorption (beta-CrossLaps) markers, and differences between placebo and calcitriol-treated group were evaluated. At baseline, osteocalcin levels were significantly lower in female than in male patients (P<0.01) while no other metabolic parameters as HbA1c and C-peptide differed between gender. No significant correlations were found in relation to HbA1c, insulin requirement and C-peptide. At 1 year follow-up, no significant differences were observed between calcitriol and placebo groups for osteocalcin and β-CrossLaps. In the placebo group osteocalcin levels were unrelated with parameters of metabolic control, such as C-peptide, insulin requirement or HbA1c. Changes of C-peptide, insulin requirement and HbA1c were not related to osteocalcin levels. Supplementation with 0.25 µg calcitriol per day to patients with new-onset T1D does not affect circulating markers of bone turnover. OC levels were unrelated to β-cell function and other metabolic parameters suggesting that OC is ineffective to control pancreatic function in presence of aggressive autoimmune destruction.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
1α,25-Dihydroxyvitamin D3, ≥99% (HPLC)
Sigma-Aldrich
1α,25-Dihydroxyvitamin D3, ≥97.0% (HPLC)
Supelco
1α,25-Dihydroxyvitamin D3 solution, 5 μg/mL in ethanol, ampule of 1 mL, certified reference material, Cerilliant®
Calcitriol, European Pharmacopoeia (EP) Reference Standard

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