کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9266225 | 1217274 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Mycobacterium tuberculosis 6Â kDa early secreted antigenic target stimulates activation of J774 macrophages
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
ایمنی شناسی و میکروب شناسی
ایمونولوژی
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چکیده انگلیسی
The influence of the 6 kDa early-secreted antigenic target (ESAT-6) of Mycobacterium tuberculosis on macrophage activation was investigated using J774 macrophage cell line. While without effect if applied alone, ESAT-6 in a dose-dependent manner enhanced nitric oxide (NO) release by IFN-γ-stimulated J774 cells. However, it completely failed to modulate NO production in J774 cells activated with E. coli lipopolysaccharide. The effect of ESAT-6 on NO synthesis in IFN-γ-activated J774 cells was accompanied by up-regulated expression of inducible NO synthase (iNOS), an enzyme that catalyzes NO formation. ESAT-6-mediated enhancement of macrophage NO release was markedly suppressed by pharmacological agents that selectively inhibit iNOS enzymatic activity or protein tyrosine kinase and mitogen-activated protein kinase activation. Finally, treatment of J774 macrophages with ESAT-6 also enhanced IFN-γ-induced expression of the surface molecules B7.1, MHC-II, and ICAM-1. Collectively, these data suggest that ESAT-6 might contribute to macrophage activation in tuberculosis.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Immunology Letters - Volume 98, Issue 2, 15 May 2005, Pages 180-188
Journal: Immunology Letters - Volume 98, Issue 2, 15 May 2005, Pages 180-188
نویسندگان
Gyanesh Singh, Balwan Singh, Vladimir Trajkovic, Pawan Sharma,