1. Academic Validation
  2. Loss of fragile site-associated tumor suppressor promotes antitumor immunity via macrophage polarization

Loss of fragile site-associated tumor suppressor promotes antitumor immunity via macrophage polarization

  • Nat Commun. 2021 Jul 14;12(1):4300. doi: 10.1038/s41467-021-24610-x.
Lijuan Zhang  # 1 Kai Zhang  # 1 Jieyou Zhang  # 1 Jinrong Zhu 2 Qing Xi 1 Huafeng Wang 3 Zimu Zhang 1 Yingnan Cheng 1 Guangze Yang 1 Hongkun Liu 1 Xiangdong Guo 1 Dongmei Zhou 1 Zhenyi Xue 1 Yan Li 1 Qi Zhang 4 Yurong Da 1 Li Liu 5 Zhinan Yin 6 Zhi Yao 1 Rongxin Zhang 7 8
Affiliations

Affiliations

  • 1 Key Laboratory of Immune Microenvironment and Diseases (Ministry of Education), Department of Immunology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China.
  • 2 Guangdong Province Key Laboratory for Biotechnology Drug Candidates, School of Life Sciences and Biopharmaceutics, Guangdong Pharmaceutical University, Guangzhou, China.
  • 3 School of Life Science, Shanxi Normal University, Linfen, China.
  • 4 Institute of Integrative Medicines for Acute Abdominal Diseases, Nankai Hospital, Tianjin, China.
  • 5 Department of Radiology, The University of Texas Southwestern Medical Center, Dallas, TX, USA.
  • 6 The First Affiliated Hospital, Biomedical Translation Research Institute and Guangdong Province Key Laboratory of Molecular Immunology and Antibody Engineering, Jinan University, Guangzhou, China.
  • 7 Guangdong Province Key Laboratory for Biotechnology Drug Candidates, School of Life Sciences and Biopharmaceutics, Guangdong Pharmaceutical University, Guangzhou, China. rxzhang@gdpu.edu.cn.
  • 8 Key Laboratory of Immune Microenvironment and Diseases (Ministry of Education), Tianjin Medical University, Tianjin, China. rxzhang@gdpu.edu.cn.
  • # Contributed equally.
Abstract

Common fragile sites (CFSs) are specific breakage-prone genomic regions and are present frequently in Cancer cells. The (E2-independent) E3 ubiquitin-conjugating Enzyme FATS (fragile site-associated tumor suppressor) has antitumor activity in Cancer cells, but the function of FATS in immune cells is unknown. Here, we report a function of FATS in tumor development via regulation of tumor immunity. Fats-/- mice show reduced subcutaneous B16 melanoma and H7 pancreatic tumor growth compared with WT controls. The reduced tumor growth in Fats-/- mice is macrophage dependent and is associated with a phenotypic shift of macrophages within the tumor from tumor-promoting M2-like to antitumor M1-like macrophages. In addition, FATS deficiency promotes M1 polarization by stimulating and prolonging NF-κB activation by disrupting NF-κB/IκBα negative feedback loops and indirectly enhances both CD4+ T helper type 1 (Th1) and cytotoxic T lymphocyte (CTL) adaptive immune responses to promote tumor regression. Notably, transfer of Fats-/- macrophages protects mice against B16 melanoma. Together, these data suggest that FATS functions as an immune regulator and is a potential target in Cancer Immunotherapy.

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