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Minerals, trace elements, Vit. D and bone health

Vitamin D supplementation has no effects on progression of motor dysfunction in amyotrophic lateral sclerosis (ALS)

Abstract

Objectives

To investigate the effects of cholecalciferol supplementation on the progression of motor disability in a cohort of amyotrophic lateral sclerosis (ALS) patients with low blood 25-hydroxyvitamin D3 [25(OH)D] levels, on the basis of the hypothesis of potential neuroprotective effects of vitamin D supplementation.

Methods

Forty-eight ALS patients, 34 with deficient (<20 ng/mL) and 14 with insufficient (20–29 ng/mL) serum levels of 25(OH)D, were randomized and treated by 3 different doses of cholecalciferol [50.000, 75.000 and 100.000 international units (IU) /month] and evaluated after 6-months. Assessment of motor dysfunction at baseline and after 6 months included ALS Functional Rating Scale-Revised (ALFRS-R) and upper motor neuron (UMN) scores and blood samples for 25(OH)D levels.

Results

Clinical data of 33 patients were available after 6 months. Analysis of Covariance (ANCOVA), with pre-treatment measurements included as covariate, did not show statistically significant differences in the ALSFRS-R (p > 0.05) and UMN (p > 0.05) among the patient groups who underwent 3 different doses of cholecalciferol. Conversely, the treatment with 75.000 IU/month or 100.000 IU/month induced a significant increase in serum levels of 25(OH)D in comparison with the supplementation with 50.000 IU/month; no significant differences were found between 75.000 IU/month and 100.000 IU/month.

Conclusions

Our findings highlighted that 6-month supplementation of vitamin D in ALS patients had no significant effects on motor dysfunction. However, it is recommended to prevent medical complications of vitamin D deficiency in ALS patients as well as in other populations of neurodegenerative patients, characterized by low mobility and decreased sun exposure.

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Acknowledgements

The authors are grateful to all patients with ALS who kindly agreed to take part in this research.

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FT, MS, GS, MRM, and GT conceived and designed the experiments; FT, MS, CP, AB, AR, LL, SE, and DR performed the experiments; FT, MS, CP, and GS analyzed the data; FT, MS, CP, AB, AR, LL, SE, DR, MRM, and GT contributed reagents/materials/analysis tools; FT, MS, GT, and GS wrote and/or revised the paper.

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Correspondence to Francesca Trojsi.

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Trojsi, F., Siciliano, M., Passaniti, C. et al. Vitamin D supplementation has no effects on progression of motor dysfunction in amyotrophic lateral sclerosis (ALS). Eur J Clin Nutr 74, 167–175 (2020). https://doi.org/10.1038/s41430-019-0448-3

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