title: Low vitamin D status is associated with low cord blood levels of the immunosuppressive cytokine interleukin-10.
abstract: The cytokine interleukin-10 (IL-10) plays a pivotal regulatory role in tolerizing exogenous antigens. Experimental data indicate that low cellular availability of the vitamin D hormone 1,25-dihydroxyvitamin D [1,25(OH)2D] results in a down-regulation of IL-10 concentrations. The tissue production of an adequate amount of 1,25(OH)2D depends on a high circulating 25-hydroxyvitamin D (25-OHD) level. The present study was thus aimed at evaluating the associations between season of birth, vitamin D status, and the allergy risk markers IL-10 and total immunoglobulin (IgE) in newborns. Cord blood was obtained from 49 infants born during the summer half year (mid-April to mid-October, geographic latitude 51 degrees N) and from 47 infants born during the winter half year (mid-October to mid-April, geographic latitude of 51 degrees N). Serum levels of 25-OHD were 99% higher, and IL-10 levels were 43% higher in the summer half year compared with the winter half year (p < 0.001 and p = 0.018). Moreover, the ratio of IL-10 to total IgE was 124% higher in the summer half year compared with the winter half year (p = 0.039). Serum levels of 25-OHD were correlated with IL-10 levels (r = +0.22; p < 0.05). Mothers' age, gestational ages, birth weights and serum 1,25(OH)2D levels did not differ between study groups. We conclude that the low vitamin D status of infants born in winter may at least in part adversely affect biomarkers of allergy risk.
authors.affiliation: Department of Nutrition Science, University of Bonn, Bonn, Germany. azittermann@hdz-nrw.de
authors.forename: Armin
authors.initials: A
authors.lastname: Zittermann
authors.forename: Jörg
authors.initials: J
authors.lastname: Dembinski
authors.forename: Peter
authors.initials: P
authors.lastname: Stehle
mesh_terms: D015652:25-Hydroxyvitamin D 2 / Q000097:blood; D002112:Calcifediol / Q000097:blood; D002118:Calcium / Q000097:blood; D004198:Disease Susceptibility / Q000276:immunology; D005312:Fetal Blood / Q000737:chemistry*; D005858:Germany; D006801:Humans; D007073:Immunoglobulin E / Q000097:blood; D007223:Infant; D007231:Infant, Newborn / Q000097:blood / Q000276:immunology*; D016753:Interleukin-10 / Q000097:blood*; D012621:Seasons; D014807:Vitamin D / Q000031:analogs & derivatives* / Q000097:blood*
chemical_list: D016753:Interleukin-10; D014807:Vitamin D; D015652:25-Hydroxyvitamin D 2; D007073:Immunoglobulin E; C097949:1,25-dihydroxyvitamin D; D002112:Calcifediol; D002118:Calcium