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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Holla, Sahana Sinha, Akhauri Yash Alagesan, Senthil Kumar Balaji, Kithiganahalli Narayanaswamy Ghorpade, Devram Sampat |
| Description | Author Affiliation: Ghorpade DS ( Department of Microbiology and Cell Biology, Indian Institute of Science, Bangalore 560012, India.) |
| Abstract | Pathogenic mycobacteria employ several immune evasion strategies such as inhibition of class II transactivator (CIITA) and MHC-II expression, to survive and persist in host macrophages. However, precise roles for specific signaling components executing down-regulation of CIITA/MHC-II have not been adequately addressed. Here, we demonstrate that Mycobacterium bovis bacillus Calmette-Guérin (BCG)-mediated TLR2 signaling-induced iNOS/NO expression is obligatory for the suppression of IFN-γ-induced CIITA/MHC-II functions. Significantly, NOTCH/PKC/MAPK-triggered signaling cross-talk was found critical for iNOS/NO production. NO responsive recruitment of a bifunctional transcription factor, KLF4, to the promoter of CIITA during M. bovis BCG infection of macrophages was essential to orchestrate the epigenetic modifications mediated by histone methyltransferase EZH2 or miR-150 and thus calibrate CIITA/MHC-II expression. NO-dependent KLF4 regulated the processing and presentation of ovalbumin by infected macrophages to reactive T cells. Altogether, our study delineates a novel role for iNOS/NO/KLF4 in dictating the mycobacterial capacity to inhibit CIITA/MHC-II-mediated antigen presentation by infected macrophages and thereby elude immune surveillance. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 28 |
| Volume Number | 288 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2013-07-12 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Histocompatibility Antigens Class II Immunology Kruppel-Like Transcription Factors Nitric Oxide Nuclear Proteins Trans-Activators Tuberculosis Animals Cell Line Cells, Cultured Epigenesis, Genetic Gene Expression Drug Effects Genetics Metabolism Host-Pathogen Interactions Immunoblotting Interferon-gamma Pharmacology Macrophages Microbiology Mice Mice, Inbred BALB C Mice, Inbred C57BL Mice, Knockout MicroRNAs Microscopy, Confocal Mycobacterium Bovis Physiology Nitric Oxide Synthase Type II Polycomb Repressive Complex 2 RNA Interference Reverse Transcriptase Polymerase Chain Reaction Veterinary Research Support, Non-U.S. Gov't Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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