title: Profiles of IFN-gamma and its regulatory cytokines (IL-12, IL-18 and IL-10) in peripheral blood mononuclear cells from patients with multidrug-resistant tuberculosis.
abstract: This study investigated the profiles of IFN-gamma and its regulatory cytokines (IL-12, IL-18 and IL-10) in response to a purified protein derivative (PPD) antigen in peripheral blood mononuclear cells (PBMC) from 18 HIV-negative patients with multidrug-resistant tuberculosis (MDRTB), and compared them with those from 19 healthy tuberculin reactors (HTR). ELISA results showed that following stimulation with PPD, IFN-gamma production was significantly reduced, whereas production of both IL-18 and IL-10 was significantly elevated in MDRTB patients compared with HTR. Three out of 18 patients with MDRTB of greater than 4 years duration showed significantly elevated IL-12 p70 production, induced by in vitro PPD stimulation of their PBMC, when compared with data from HTR. However, when taken as a group, MDRTB patients were similar to HTR in their IL-12 p70-producing capacity. IL-12 p70 protein paralleled IL-12 p40 protein expression. In addition, the production of IL-12 p40 was significantly correlated with IL-10 in all patients, but was not correlated with IFN-gamma. Neutralization of IL-10 increased IL-12 p40 about twofold, but did not significantly alter IFN-gamma induction in MDRTB. IFN-gamma in MDRTB was highly correlated with lymphoproliferation and CD4 counts, but was not correlated with IL-12, IL-18 or IL-10 production. Our findings suggest that patients with MDRTB have dysregulated IL-12, IL-18 and IL-10 production during Mycobacterium tuberculosis infection, and the cytokine profiles are similar to those in patients with drug-sensitive advanced TB previously reported in the literature. In addition, IL-10 may not have a dominant role in defective IFN-gamma production in patients with MDRTB.
authors.affiliation: Department of Microbiology, College of Medicine, Chungnam National University, Taejon, Korea.
authors.forename: J-S
authors.initials: JS
authors.lastname: Lee
authors.forename: C-H
authors.initials: CH
authors.lastname: Song
authors.forename: C-H
authors.initials: CH
authors.lastname: Kim
authors.forename: S-J
authors.initials: SJ
authors.lastname: Kong
authors.forename: M-H
authors.initials: MH
authors.lastname: Shon
authors.forename: H-J
authors.initials: HJ
authors.lastname: Kim
authors.forename: J-K
authors.initials: JK
authors.lastname: Park
authors.forename: T-H
authors.initials: TH
authors.lastname: Paik
authors.forename: E-K
authors.initials: EK
authors.lastname: Jo
mesh_terms: D000328:Adult; D000368:Aged; D018791:CD4 Lymphocyte Count; D015496:CD4-Positive T-Lymphocytes / Q000166:cytology / Q000187:drug effects / Q000276:immunology; D002455:Cell Division; D002478:Cells, Cultured; D005260:Female; D006801:Humans; D007371:Interferon-gamma / Q000096:biosynthesis*; D016753:Interleukin-10 / Q000096:biosynthesis*; D018664:Interleukin-12 / Q000096:biosynthesis*; D020382:Interleukin-18 / Q000096:biosynthesis*; D007963:Leukocytes, Mononuclear / Q000166:cytology / Q000187:drug effects / Q000276:immunology; D008297:Male; D008875:Middle Aged; D009500:Neutralization Tests; D014373:Tuberculin / Q000494:pharmacology; D018088:Tuberculosis, Multidrug-Resistant / Q000097:blood / Q000276:immunology*
chemical_list: D020382:Interleukin-18; D014373:Tuberculin; D016753:Interleukin-10; D018664:Interleukin-12; D007371:Interferon-gamma