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J. Exp. Med.,
Volume 189, Number 12, June 21, 1999 1863-1874
on Tuberculosis
By






From the * Division of Infectious Diseases, Case Western Reserve University, Cleveland, Ohio
44106-4984; and the Several lines of evidence suggest that host genetic factors controlling the immune response influence infection by Mycobacterium tuberculosis. The proinflammatory cytokine interleukin (IL)-1
Wellcome Center for Clinical Tropical Medicine, Imperial College School of
Medicine, Northwick Park Hospital, Harrow HA1 3UJ, United Kingdom
and its antagonist, IL-1Ra (IL-1 receptor agonist), are strongly induced by M. tuberculosis and
are encoded by polymorphic genes. The induction of both IL-1Ra mRNA and secreted protein by M. tuberculosis in IL-1Ra allele A2-positive (IL-1Ra A2+) healthy subjects was 1.9-fold
higher than in IL-1Ra A2
subjects. The M. tuberculosis-induced expression of mRNA for IL-1
was higher in subjects of the IL-1
(+3953) A1+ haplotype (P = 0.04). The molar ratio of
IL-1Ra/IL-1
induced by M. tuberculosis was markedly higher in IL-1Ra A2+ individuals (P < 0.05), with minor overlap between the groups, reflecting linkage between the IL-1Ra A2 and
IL-1
(+3953) A2 alleles. In M. tuberculosis-stimulated peripheral blood mononuclear cells, the
addition of IL-4 increased IL-1Ra secretion, whereas interferon
increased and IL-10 decreased IL-1
production, indicative of a differential influence on the IL-1Ra/IL-1
ratio by
cytokines. In a study of 114 healthy purified protein derivative-reactive subjects and 89 patients with tuberculosis, the frequency of allelic variants at two positions (
511 and +3953) in
the IL-1
and IL-1Ra genes did not differ between the groups. However, the proinflammatory IL-1Ra A2
/IL-1
(+3953) A1+ haplotype was unevenly distributed, being more common in
patients with tuberculous pleurisy (92%) in comparison with healthy M. tuberculosis-sensitized
control subjects or patients with other disease forms (57%, P = 0.028 and 56%, P = 0.024, respectively). Furthermore, the IL-1Ra A2+ haplotype was associated with a reduced Mantoux response
to purified protein derivative of M. tuberculosis: 60% of tuberculin-nonreactive patients were of this
type. Thus, the polymorphism at the IL-1 locus influences the cytokine response and may be a determinant of delayed-type hypersensitivity and disease expression in human tuberculosis.
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