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Effect of vitamin D supplementation on circulating concentrations of C-reactive protein (CRP) in adults aged 20–40 and 64+ years

Published online by Cambridge University Press:  04 June 2010

A. Lucey ,
T. Hill ,
S. Muldowney ,
K. Seamans ,
J. M. W. Wallace ,
G. Horigan ,
M. S. Barnes ,
K. D. Cashman  and
M. Kiely
A. Lucey
Affiliation:
Department of Food and Nutritional Sciences, University College Cork, Ireland
T. Hill
Affiliation:
Department of Food and Nutritional Sciences, University College Cork, Ireland
S. Muldowney
Affiliation:
Department of Food and Nutritional Sciences, University College Cork, Ireland
K. Seamans
Affiliation:
Department of Food and Nutritional Sciences, University College Cork, Ireland
J. M. W. Wallace
Affiliation:
Northern Ireland Centre for Food and Health, University of Ulster, Coleraine, BT52 1SA, Northern Ireland
G. Horigan
Affiliation:
Northern Ireland Centre for Food and Health, University of Ulster, Coleraine, BT52 1SA, Northern Ireland
M. S. Barnes
Affiliation:
Northern Ireland Centre for Food and Health, University of Ulster, Coleraine, BT52 1SA, Northern Ireland
K. D. Cashman
Affiliation:
Department of Food and Nutritional Sciences, University College Cork, Ireland
M. Kiely
Affiliation:
Department of Food and Nutritional Sciences, University College Cork, Ireland
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Abstract

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Information
Proceedings of the Nutrition Society , Volume 69 , Issue OCE3: 3rd Immunonutrition Workshop, 21–24 October 2009, Girona, Spain , 2010 , E250
Copyright
Copyright © The Authors 2009

C-reactive protein (CRP) is a measure of systemic inflammation; elevations in CRP concentrations are linked to increased risk of cardiovascular events(Reference Ridker and Silvertown1). Vitamin D supplementation decreased circulating CRP concentrations in adults with serum 25-hydroxyvitamin D (25(OH)D) levels <27.5 nmol/l(Reference Timms, Mannan and Hitman2).

The effect of vitamin D supplementation (0, 5, 10 and 15 μg vitamin D3/d) on circulating CRP concentrations was examined in two randomised, placebo-controlled, double-blind 22-week intervention studies in men and women aged 20–40 years (n=213; during winter 2006/07(Reference Cashman, Hill and Lucey3)) and 64+ years (n=209; during winter 2007/08(Reference Cashman, Wallace and Horigan4)) from Cork and Coleraine. Fasting serum levels of high sensitivity CRP and 25(OH)D were measured by ELISA at baseline (BL) and endpoint (EP).

No baseline differences in concentrations of CRP or 25(OH)D were observed between the four treatment groups. At BL, in the 20–40 year olds, linear regression analysis showed BMI to be the main determinant of CRP concentrations (β=0.351; 95% CI 0.027, 0.058; P<0.001). In the 64+ years group, age (β=0.140; 95% CI 0.000, 0.024; P=0.046), systolic blood pressure (β=0.143; 95% CI 0.000, 0.007; P=0.041) and BMI (β=0.139; 95% CI 0.000, 0.026; P=0.042) were the main determinants of CRP levels. Vitamin D supplementation significantly influenced 25(OH)D concentrations(Reference Cashman, Hill and Lucey3, Reference Cashman, Wallace and Horigan4). In both age groups, 25(OH)D concentrations were not related to CRP. Using CRP concentrations at EP as the dependent variable, ANCOVA, controlling for centre, age, gender, BMI, baseline 25(OH)D (and systolic blood pressure for 64+years), showed no effect of treatment across the four groups. In conclusion, vitamin D supplementation had no effect on circulating CRP concentrations in apparently healthy adults aged 20–40 and 64+ years.

Values presented as median (IQR). Values with different superscript letters are significantly different, P<0.001. *ANCOVA.

We acknowledge the UK Food Standards Agency and the Irish Department of Agriculture, Food and Fisheries through the Food Institutional Research Measure for their support.

References

1.Ridker, PM & Silvertown, JD (2008) J Periodontal. 79, 1544–1551.CrossRefGoogle Scholar
2.Timms, PM, Mannan, N, Hitman, GA et al. (2002) Q J Med 95, 787–796.CrossRefGoogle Scholar
3.Cashman, KD, Hill, TR, Lucey, AJ et al. (2008) Am J Clin Nutr 88, 1535–1542.CrossRefGoogle Scholar
4.Cashman, KD, Wallace, JMW, Horigan, G et al. (2009) Am J Clin Nutr 89, 1–9.CrossRefGoogle Scholar