Associations between serum folate and vitamin D levels and incident mouse sensitization in adults

Corinne Keet, Wayne G. Shreffler, Roger Peng, William Matsui, Elizabeth C. Matsui

Research output: Contribution to journalArticle

Abstract

Background Although both folic acid intake and vitamin D levels are hypothesized to be contributors to the increased incidence of allergic diseases, prospective studies of these relationships have not been done in adults. Objectives We sought to determine whether serum folate or vitamin D levels are associated with incident mouse sensitization among new workers at a mouse facility. Methods Subjects started employment at the Jackson Laboratory between June 2004 and July 2007. Skin testing to mouse and other allergens and collection of questionnaire data were performed at baseline and every 6 months. Serum folate and vitamin D levels were assessed on baseline samples stored at -80 C. Folate was categorized into tertiles (2.5-10.5, 10.5-16.2, and 16.2-78.4 ng/mL, respectively). Vitamin D was categorized as less than 20 ng/mL, 20 to 29 ng/mL, or 30 ng/mL or greater. This was a nested case-control study in which 5 control subjects were matched to each case on baseline atopy and type of employment. Multivariate analyses controlled for age, sex, education, smoking, season, personal mouse exposure, and serum folate and vitamin D levels. Results Thirty-five cases and 47 control subjects were included. The odds of incident mouse sensitization were higher in the intermediate and highest tertiles of serum folate compared with the lowest tertile of serum folate (odds ratio of 10.5 [95% CI, 1.8-61.5; P =.009] and odds ratio of 5.6 [95% CI, 1.8-31.3; P =.049], respectively, in the multivariate model). Serum vitamin D levels were not associated with incident mouse sensitization. Conclusions These findings support a role for higher serum folate levels in increased risk of incident allergic disease, even during adulthood.

Original languageEnglish (US)
Pages (from-to)399-404
Number of pages6
JournalThe Journal of Allergy and Clinical Immunology
Volume133
Issue number2
DOIs
StatePublished - Feb 2014

Fingerprint

Folic Acid
Vitamin D
Serum
Odds Ratio
Sex Education
Allergens
Case-Control Studies
Multivariate Analysis
Smoking
Prospective Studies
Skin
Incidence

Keywords

  • allergy
  • Folate
  • folic acid
  • mouse allergy
  • sensitization
  • vitamin D

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

Cite this

Associations between serum folate and vitamin D levels and incident mouse sensitization in adults. / Keet, Corinne; Shreffler, Wayne G.; Peng, Roger; Matsui, William; Matsui, Elizabeth C.

In: The Journal of Allergy and Clinical Immunology, Vol. 133, No. 2, 02.2014, p. 399-404.

Research output: Contribution to journalArticle

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abstract = "Background Although both folic acid intake and vitamin D levels are hypothesized to be contributors to the increased incidence of allergic diseases, prospective studies of these relationships have not been done in adults. Objectives We sought to determine whether serum folate or vitamin D levels are associated with incident mouse sensitization among new workers at a mouse facility. Methods Subjects started employment at the Jackson Laboratory between June 2004 and July 2007. Skin testing to mouse and other allergens and collection of questionnaire data were performed at baseline and every 6 months. Serum folate and vitamin D levels were assessed on baseline samples stored at -80 C. Folate was categorized into tertiles (2.5-10.5, 10.5-16.2, and 16.2-78.4 ng/mL, respectively). Vitamin D was categorized as less than 20 ng/mL, 20 to 29 ng/mL, or 30 ng/mL or greater. This was a nested case-control study in which 5 control subjects were matched to each case on baseline atopy and type of employment. Multivariate analyses controlled for age, sex, education, smoking, season, personal mouse exposure, and serum folate and vitamin D levels. Results Thirty-five cases and 47 control subjects were included. The odds of incident mouse sensitization were higher in the intermediate and highest tertiles of serum folate compared with the lowest tertile of serum folate (odds ratio of 10.5 [95{\%} CI, 1.8-61.5; P =.009] and odds ratio of 5.6 [95{\%} CI, 1.8-31.3; P =.049], respectively, in the multivariate model). Serum vitamin D levels were not associated with incident mouse sensitization. Conclusions These findings support a role for higher serum folate levels in increased risk of incident allergic disease, even during adulthood.",
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