期刊
AMERICAN JOURNAL OF RESPIRATORY AND CRITICAL CARE MEDICINE
卷 176, 期 2, 页码 208-213出版社
AMER THORACIC SOC
DOI: 10.1164/rccm.200701-007OC
关键词
human; vitamin D; innate immunity; mycobacteria
资金
- Medical Research Council [G0400503B, MC_U117588499] Funding Source: researchfish
- Medical Research Council [MC_U117588499] Funding Source: Medline
- Wellcome Trust [064261, 077273, 066321, 072070] Funding Source: Medline
- MRC [MC_U117588499] Funding Source: UKRI
Rationale: Vitamin D was used to treat tuberculosis (TB) in the preantibiotic era. Prospective studies to evaluate the effect of vitamin D supplementation on anti mycobacterial immunity have not previously been performed. Objectives: To determine the effect of vitamin D supplementation on antimycobacterial immunity and vitamin D status. Methods: A double-blind randomized controlled trial was conducted in 192 healthy adult TB contacts in London, United Kingdom. Participants were randomized to receive a single oral dose of 2.5 mg vitamin D or placebo and followed up at 6 weeks. Measurements and Main Results: The primary outcome measure was assessed with a functional whole blood assay (BCG-lux assay), which measures the ability of whole blood to restrict luminescence, and thus growth, of recombinant reporter mycobacteria in vitro; the readout is expressed as a luminescence ratio (luminescence postinfection/baseline luminescence). IFN-gamma responses to the Mycobacterium tuberculosis antigens early secretory antigenic target-6 and culture filtrate protein 10 were determined with a second whole blood assay. Vitamin D supplementation significantly enhanced the ability of participants' whole blood to restrict BCG-lux luminescence in vitro compared with placebo (mean luminescence ratio at followup, 0.57, vs. 0.71, respectively; 95% confidence interval for difference, 0.01-0.25; p = 0.03) but did not affect antigen-stimulated IFN-gamma secretion. Conclusions: A single oral dose of 2.5 mg vitamin D significantly enhanced the ability of participants' whole blood to restrict BCG-lux luminescence in vitro without affecting antigen-stimulated IFN-gamma responses. Clinical trials should be performed to determine whether vitamin D supplementation prevents reactivation of latent TB infection. Clinical trial registered with www.clinicaltrials.gov (NCT 00157066).
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