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High serum vitamin D protects against renal dysfunction due to cadmium exposure

16 Apr 2018
Kidney failures and organ donors: Singapore

High serum levels of 25-hydroxyvitamin D (25(OH)D) appear to reduce the risk of renal tubular dysfunction in individuals exposed to cadmium, a recent study has shown.

The study included 133 adults born in two cadmium-polluted areas and one control area. Cadmium levels in urine (UCd) and blood (BCd) were measured, along with urinary β2Microglobulin (UBMG), urinary creatinine (UCr), urinary retinol binding protein (URBP) and serum 25(OH)D.

There was a significant and inverse association between serum 25(OH)D and UBMG and URBP (p<0.05). Participants with serum 25(OH)D levels ≥40 ng/mL were less likely to have renal dysfunction when either UBMG (odds ratio [OR], 0.20; 95 percent CI, 0.1–0.8) or URBP (OR, 0.28; 0.1–1.1) was used as indicators. Serum 25(OH)D <30 ng/mL was used as reference.

A similar trend was observed when analysis was restricted to participants with high UCd or BCd concentrations.

Using UBMG as a marker, researchers showed that those with UCd ≥3.0 µg/g Cr but serum 25(OH)D ≥40 ng/mL had significantly lower risks of renal dysfunction (OR, 0.23; 0.1–0.9). In participants with BCd ≥2.0 µg/L, high serum levels of 25(OH)D also correlated significantly with reduced UBMG (OR, 0.19; 0.1–0.8).

The trends for both high-UCd and high-BCd patients were similar when using URBP as an indicator of renal dysfunction, but the effects were not statistically significant.

“[T]he [protective] effects of vitamin D against cadmium-induced renal dysfunction may be due to its role on oxidative stress and inflammatory reaction,” said researchers.

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Most Read Articles
Tristan Manalac, 6 days ago
Atopic dermatitis appears to impair sleep quality, but not sleep duration, in children, particularly in those with more severe diseases, according to a new study.
13 Mar 2019
Individuals following a diet low in or free of meat are at lower risk of diabetes, and this protective association is partly attributable to having a lower body mass index when compared with regular meat eaters, according to a study.
4 days ago
Drinking coffee confers benefits for recurrence of hepatocellular carcinoma (HCC) and survival following orthotopic liver transplantation, a study has found.
13 Mar 2019
Vitamin E supplementation does not appear to contribute to blood pressure (BP) improvement, with results of a recent systematic review and meta-analysis showing decreases only in systolic (S)BP but no favourable effect on diastolic (D)BP and mean arterial pressure (MAP).