The final group of phage clones that was enriched was collected and subjected to DNA extraction. a delay in the early T cell response to (3). Moreover, can induce the expansion of TB-specific regulatory T cells, thereby delaying the immune response (4, 5). As an innate immune cell type, T cells represent only 1~5% of human peripheral blood lymphocytes, but they predominate in tissues such as the skin, tongue mucosa, and respiratory epithelium. However, first contact between and the body occurs precisely in the respiratory epithelial mucosa and alveolar surface. INCA-6 Early studies have shown that the number of human V9+/V2+ T cells is reduced in the peripheral blood of patients with active pulmonary TB, indicating that V9+/V2+T cells play a protective role (6). Many studies have investigated the activation, proliferation, apoptosis and mechanisms of T cells during infection. Previous results have confirmed that T cells can provide protection to the host in the early stages of infection (7C10). Changes in the T cell receptor (TCR) repertoire can reflect the state of the human immune system. Therefore, the characteristics of the TCR repertoire have been widely studied in many diseases, such as HIV infection (11), rheumatoid arthritis (12, 13) and lung carcinoma (14). In the early stage of contamination, T cells recognize contamination. Therefore, studying the correlation between the CDR3 repertoire and TB will identify the specific CDR3 sequence profile and provide new clues for understanding the mechanisms of T cells in the defense against Mtb contamination. T cells can be stimulated by to produce interferon- (IFN-) and interleukin 17 (IL-17), which mediate the immune response caused by acute and chronic Tnfrsf1a infection and safeguard the human body (18). IFN- is usually significantly reduced while IL-17 is usually significantly increased INCA-6 in TB patients compared with in bacillus calmette-gurin (BCG)-stimulated healthy controls (19). Previous studies in our laboratory showed that this recognition of some protein ligands by T cells is based on the dual recognition mechanism INCA-6 of both TCR and natural killer group 2 member D (NKG2D) (20). However, the mechanism of recognition by T cells remains unclear. Currently, studies of TCR ligands have focused on non-peptide phosphorylation antigens represented by isoprene pyrophosphate (IPP). Further elucidating the anti-infection mechanism of T cells therefore requires identifying additional contamination in TB patients and BCG vaccine stimulation using high-throughput sequencing and identified 10 specific CDR3 dominant sequences related to infection. In addition, we used protein Rv0002 as a novel ligand for TCR. This protein can stimulate T cell activation in the peripheral blood of healthful handles and TB sufferers and will stimulate T cell proliferation in TB sufferers. This study offers a molecular basis for T cell-mediated level of resistance to infection as well as for the introduction of anti-tuberculosis analysis. Materials and Strategies Study Topics Peripheral bloodstream examples for phenotypic evaluation and high-throughput sequencing had been extracted from 14 sufferers (age group, 40.1 19.5 years; the proportion of male to feminine was 11:3), including 10 situations with supplementary pulmonary tuberculosis, 3 situations with tuberculous INCA-6 pleurisy and one with cavity tuberculosis. All sufferers were newly identified as having acute TB infections and was not treated with anti-tuberculosis medications. The characteristics of the sufferers are summarized in Desk S1. Fifteen healthful volunteers (age group, 44.6 10.9 years; male: feminine ratio, 7:8) had been included as healthful handles (HCs). All sufferers and healthful volunteers agreed upon donation consent forms before test collection. Nothing from the healthy volunteers had a history background of tuberculosis or any other underlying disease including viral and other.