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    Studies on the Role of Type I Interferon in Regulating Migration of Ag-specific T cells in Tuberculosis and Virus Coinfection = 종양미세환경에서의 CCL3의 T 세포 강화와 PD-1 면역관문억제 치료 효과 증진

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    https://www.riss.kr/link?id=T15875620

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    다국어 초록 (Multilingual Abstract) kakao i 다국어 번역

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    Chemokines are key factors that influence the migration and maintenance of relevant immune cells into an infected tissue or a tumor microenvironment. Therefore, it is believed that the controlled administration of chemokines in the tumor microenvironment may be an effective immunotherapy against cancer. Previous studies have shown that CCL3, also known as MIP-1 alpha, facilitates the recruitment of dendritic cells for the presentation of tumor antigens and promotes T cell activation. Here, we investigated the role of CCL3 in regulating the tumor microenvironment using a syngeneic mouse tumor model. We observed that MC38 tumors overexpressing CCL3 (CCL3-OE) showed rapid regression compared with the wild type MC38 tumors. Additionally, these CCL3-OE tumors showed an increase in the proliferative and functional tumor-infiltrating T cells. Furthermore, PD-1 immune checkpoint blockade accelerated tumor regression in the CCL3-OE tumor microenvironment. Next, we generated a modified CCL3 protein for preclinical use by fusing recombinant CCL3 (rCCL3) with a non-cytolytic hybrid Fc (HyFc). Administering a controlled dose of rCCL3-HyFc via subcutaneous injections near tumors was effective in tumor regression and improved survival along with activated myeloid cells and augmented T cell responses. Furthermore, combination therapy of rCCL3-HyFc with PD-1 blockade exhibited prominent effect to tumor regression. Collectively, our findings demonstrate that appropriate concentrations of CCL3 in the tumor microenvironment would be an effective adjuvant to promote antitumor immune responses, and suggest that administering a long-lasting form of CCL3 in combination with PD-1 blockers can have clinical applications in cancer immunotherapy.
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    Chemokines are key factors that influence the migration and maintenance of relevant immune cells into an infected tissue or a tumor microenvironment. Therefore, it is believed that the controlled administration of chemokines in the tumor microenvironm...

    Chemokines are key factors that influence the migration and maintenance of relevant immune cells into an infected tissue or a tumor microenvironment. Therefore, it is believed that the controlled administration of chemokines in the tumor microenvironment may be an effective immunotherapy against cancer. Previous studies have shown that CCL3, also known as MIP-1 alpha, facilitates the recruitment of dendritic cells for the presentation of tumor antigens and promotes T cell activation. Here, we investigated the role of CCL3 in regulating the tumor microenvironment using a syngeneic mouse tumor model. We observed that MC38 tumors overexpressing CCL3 (CCL3-OE) showed rapid regression compared with the wild type MC38 tumors. Additionally, these CCL3-OE tumors showed an increase in the proliferative and functional tumor-infiltrating T cells. Furthermore, PD-1 immune checkpoint blockade accelerated tumor regression in the CCL3-OE tumor microenvironment. Next, we generated a modified CCL3 protein for preclinical use by fusing recombinant CCL3 (rCCL3) with a non-cytolytic hybrid Fc (HyFc). Administering a controlled dose of rCCL3-HyFc via subcutaneous injections near tumors was effective in tumor regression and improved survival along with activated myeloid cells and augmented T cell responses. Furthermore, combination therapy of rCCL3-HyFc with PD-1 blockade exhibited prominent effect to tumor regression. Collectively, our findings demonstrate that appropriate concentrations of CCL3 in the tumor microenvironment would be an effective adjuvant to promote antitumor immune responses, and suggest that administering a long-lasting form of CCL3 in combination with PD-1 blockers can have clinical applications in cancer immunotherapy.

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    다국어 초록 (Multilingual Abstract) kakao i 다국어 번역

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    한국어
    Tuberculosis (TB), caused by Mycobacterium tuberculosis (Mtb), is often exacerbated upon coinfection, but the underlying immunological mechanisms remain unclear. Here, to elucidate these mechanisms, we used a TB and lymphocytic choriomeningitis virus coinfection model. Viral coinfection significantly suppressed Mtb-specific IFN-γ production, with elevated bacterial loads and hyperinflammation in the lungs. Type I IFN signaling blockade rescued the Mtb-specific IFN-γ response and ameliorated lung immunopathology. Single-cell sequencing, tissue immunofluorescence staining, and adoptive transfer experiments revealed that type I IFN produced in response to viral infection inhibited CXCL9/10 production in myeloid cells, resulting in impaired pulmonary migration of Mtb-specific CD4+ T cells from lymph nodes. Thus, virus coinfection-induced type I IFN signaling prior to the pulmonary localization of Mtb-specific Th1 cells exacerbates TB immunopathogenesis by impeding the Mtb-specific Th1 cell influx. Our study highlights another novel negative role of viral coinfection and/or type I IFNs in delaying Mtb-specific Th1 responses in the lung.
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    Tuberculosis (TB), caused by Mycobacterium tuberculosis (Mtb), is often exacerbated upon coinfection, but the underlying immunological mechanisms remain unclear. Here, to elucidate these mechanisms, we used a TB and lymphocytic choriomeningitis virus ...

    Tuberculosis (TB), caused by Mycobacterium tuberculosis (Mtb), is often exacerbated upon coinfection, but the underlying immunological mechanisms remain unclear. Here, to elucidate these mechanisms, we used a TB and lymphocytic choriomeningitis virus coinfection model. Viral coinfection significantly suppressed Mtb-specific IFN-γ production, with elevated bacterial loads and hyperinflammation in the lungs. Type I IFN signaling blockade rescued the Mtb-specific IFN-γ response and ameliorated lung immunopathology. Single-cell sequencing, tissue immunofluorescence staining, and adoptive transfer experiments revealed that type I IFN produced in response to viral infection inhibited CXCL9/10 production in myeloid cells, resulting in impaired pulmonary migration of Mtb-specific CD4+ T cells from lymph nodes. Thus, virus coinfection-induced type I IFN signaling prior to the pulmonary localization of Mtb-specific Th1 cells exacerbates TB immunopathogenesis by impeding the Mtb-specific Th1 cell influx. Our study highlights another novel negative role of viral coinfection and/or type I IFNs in delaying Mtb-specific Th1 responses in the lung.

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