Functional Polymorphisms in the Gene Encoding Macrophage Migration Inhibitory Factor Are Associated With Gram-Negative Bacteremia in Older Adults
Author(s) -
Rituparna Das,
Lakshman Subrahmanyan,
Ivana V. Yang,
David van Duin,
Rebecca Levy,
Marta Piecychna,
Lin Leng,
Ruth R. Montgomery,
Albert C. Shaw,
David A. Schwartz,
Richard Bucala
Publication year - 2013
Publication title -
the journal of infectious diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.69
H-Index - 252
eISSN - 1537-6613
pISSN - 0022-1899
DOI - 10.1093/infdis/jit571
Subject(s) - macrophage migration inhibitory factor , immunology , bacteremia , lipopolysaccharide , genotype , monocyte , locus (genetics) , biology , medicine , gene , cytokine , microbiology and biotechnology , genetics , antibiotics
Macrophage migration inhibitory factor (MIF) is an immune mediator encoded in a functionally polymorphic locus. We found the genotype conferring low expression of MIF to be enriched in a cohort of 180 patients with gram-negative bacteremia, compared with 229 healthy controls (odds ratio [OR], 2.4; P = .04), an association that was more pronounced in older adults (OR, 4.6; P = .01). Among older subjects, those with low expression of MIF demonstrated 20% reduced MIF production from lipopolysaccharide-stimulated peripheral blood monocytes and 30% lower monocyte surface Toll-like receptor 4, compared with those with high expression. Our work suggests that older adults with low expression of MIF may be predisposed to hyporesponsiveness to lipopolysaccharide and gram-negative bacterial infection.
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