Abstract：
:Mycobacterium tuberculosis (M.tb) infects 8 million and kills 2.2 million people each year worldwide. M.tb modulates the immune response of the infected individual. Empirically, suppressor carbohydrates (SC) produced by CD8+ T cells in response to M.tb were found to induce a T helper 2 response rather than a protective T helper 1 response in human mononuclear (MN) cells. This study (1) identifies the genes that modulate the T helper response, (2) describes their function, and (3) postulates a detailed model for the M.tb infection mechanism. MN cells from five healthy donors were pulsed with SC and gene expression profiles of 18,861 genes were assessed in a micro-array experiment. Twenty-eight genes were found to be increased and 60 genes were decreased (FDR=1%, fold change>1.4) in response to SC. MIP3 alpha and platelet factor 4 (v1) are both significantly enriched (p< or =0.001) in the GO category "chemokine activity". Repressed genes were significantly (p< or =0.001) over-represented in the GO terms "response to pathogenic bacteria", "inflammatory response", "coagulation" and "apoptosis". Indeed, SC significantly reduced numbers of Annexin V/CD4+ cells, while inducing hypoproliferation in CD4+ and non-adherent lymphocytes. This may indicate that M.tb renders a portion of the CD4+ T cell population unresponsive. Furthermore, validating QRT-PCR analysis suggests that monocytes provide an immuno-modulatory signal to CD4+ T cells in M.tb infection. These observations will allow development of new therapeutic interventions to restore the desired T helper 1 response.
journal_name
Mol Immunoljournal_title
Molecular immunologyauthors
Smit van Dixhoorn MG,Munir R,Sussman G,Stad R,de Haan M,van der Hoeven T,Rauwerda H,Breit TM,Thallinger GG,Wadee AAdoi
10.1016/j.molimm.2007.10.022subject
Has Abstractpub_date
2008-03-01 00:00:00pages
1573-86issue
6eissn
0161-5890issn
1872-9142pii
S0161-5890(07)00795-Xjournal_volume
45pub_type
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