title: Increased expression of suppressor of cytokine signaling-1 (SOCS-1): A mechanism for dysregulated T helper-1 responses in HIV-1 disease.
abstract: Maintenance of Th1 responses and dendritic cell (DC) functions are compromised in HIV-1 infected individuals. To better understand these immune abnormalities, we developed an HIV-1 transgenic (Tg) rat. We report that Tg DCs induce elevated levels of SOCS-1 and secrete decreased IL-12p40 and elevated levels of IL-10 following TLR-4 stimulation by LPS. This leads to further induction of SOCS-1 by IL-10 and decreased IFN-gamma-mediated induction of interferon response factor (IRF)-1 and IL-12Rbeta1 expression in CD4+ T cells and to decreased IL-12-induction of IFN-gamma production by Th1 polarized T cells. We also show that SOCS-1 is elevated in CD4+ T cells from HIV-1 infected progressors, and is correlated with defective induction of IRF-1 following IFN-gamma stimulation, compared with healthy controls and HIV-1 natural viral suppressor (NVS) patients. These results suggest a link between high levels of SOCS-1, defects in innate immunity and adaptive Th1 responses that may be reflected in the loss of Th1 immune competence observed with AIDS patients.
authors.affiliation: Institute of Human Virology of the University of Maryland School of Medicine, Baltimore, MD 21201, USA.
authors.forename: Anjana
authors.initials: A
authors.lastname: Yadav
authors.forename: Phillip
authors.initials: P
authors.lastname: Fitzgerald
authors.forename: Mohammad M
authors.initials: MM
authors.lastname: Sajadi
authors.forename: Bruce
authors.initials: B
authors.lastname: Gilliam
authors.forename: Mark K
authors.initials: MK
authors.lastname: Lafferty
authors.forename: Robert
authors.initials: R
authors.lastname: Redfield
authors.forename: William
authors.initials: W
authors.lastname: Reid
mesh_terms: D000328:Adult; D000818:Animals; D002478:Cells, Cultured; D005260:Female; D005786:Gene Expression Regulation / Q000276:immunology*; D015658:HIV Infections / Q000276:immunology / Q000503:physiopathology*; D015497:HIV-1 / Q000235:genetics / Q000276:immunology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D051381:Rats; D055647:Rats, Transgenic; D015398:Signal Transduction; D013047:Specific Pathogen-Free Organisms; D000071222:Suppressor of Cytokine Signaling 1 Protein; D050826:Suppressor of Cytokine Signaling Proteins / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology; D018417:Th1 Cells / Q000276:immunology*
chemical_list: C108944:SOCS1 protein, human; D000071222:Suppressor of Cytokine Signaling 1 Protein; D050826:Suppressor of Cytokine Signaling Proteins