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Id3 and Bcl6 Promote the Development of Long-Term Immune Memory Induced by Tuberculosis Subunit Vaccine
oleh: Jiangyuan Han, Yanlin Ma, Lan Ma, Daquan Tan, Hongxia Niu, Chunxiang Bai, Youjun Mi, Tao Xie, Wei Lv, Juan Wang, Bingdong Zhu
Format: | Article |
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Diterbitkan: | MDPI AG 2021-02-01 |
Deskripsi
Long-lived memory cell formation and maintenance are usually regulated by cytokines and transcriptional factors. Adjuvant effects of IL-7 have been studied in the vaccines of influenza and other pathogens. However, few studies investigated the adjuvant effects of cytokines and transcriptional factors in prolonging the immune memory induced by a tuberculosis (TB) subunit vaccine. To address this research gap, mice were treated with the <i>Mycobacterium tuberculosis</i> (<i>M. tuberculosis</i>) subunit vaccine Mtb10.4-HspX (MH) plus ESAT6-Ag85B-MPT64<sub><190–198></sub>-Mtb8.4-Rv2626c (LT70), together with adeno-associated virus-mediated IL-7 or lentivirus-mediated transcriptional factor Id3, Bcl6, Bach2, and Blimp1 at 0, 2, and 4 weeks, respectively. Immune responses induced by the vaccine were examined at 25 weeks after last immunization. The results showed that adeno-associated virus-mediated IL-7 allowed the TB subunit vaccine to induce the formation of long-lived memory T cells. Meanwhile, IL-7 increased the expression of <i>Id3</i>, <i>Bcl6</i>, and <i>bach2</i>—the three key transcription factors for the generation of long-lived memory T cells. The adjuvant effects of transcriptional factors, together with TB fusion protein MH/LT70 vaccination, showed that both Bcl6 and Id3 increased the production of antigen-specific antibodies and long-lived memory T cells, characterized by high proliferative potential of antigen-specific CD4<sup>+</sup> and CD8<sup>+</sup> T cells, and IFN-γ secretion in CD4<sup>+</sup> and CD8<sup>+</sup> T cells, respectively, after re-exposure to the same antigen. Overall, our study suggests that IL-7 and transcriptional factors Id3 and Bcl6 help the TB subunit vaccine to induce long-term immune memory, which contributes to providing immune protection against <i>M. tuberculosis</i> infection.