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Front. Immunol. | doi: 10.3389/fimmu.2018.02927

Ovarian Cancer-Intrinsic Fatty Acid Synthase Prevents Anti-Tumor Immunity by Disrupting Tumor-infiltrating Dendritic Cells

 Li Jiang1*, Xuhong Fang1, Hong Wang1, Diyou Li1 and Xipeng Wang1
  • 1Department of Gynecology and Obstetrics, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, China

Fatty acid synthase (FASN), the key metabolic enzyme of de novo lipogenesis, provides proliferative and metastatic capacity directly to cancer cells have been described. However, the impact of aberrant activation of this lipogenic enzyme on host anti-tumor immune milieu remains unknown. In this study, we depicted that elevated FASN expression presented in ovarian cancer with more advanced clinical phenotype and correlated with the immunosuppressive status, which characterized by the lower number and dysfunction of infiltrating T cells. Notably, in a mouse model, we showed that tumor cell-intrinsic FASN drove ovarian cancer (OvCa) progression by blunting anti-tumor immunity. Dendritic cells (DCs) are required to initiate and sustain T cell-dependent anti-tumor immunity. Here, our data showed that constitutive activation of FASN in ovarian cancer cell lead to abnormal lipid accumulation and subsequent inhibition of tumor-infiltrating DCs (TIDCs) capacity to support anti-tumor T cells. Mechanistically, FASN activation in ovarian cancer cell-induced the resulting increase of lipids present at high concentrations in the tumor microenvironment. Dendritic cells educated by FASNhigh OvCa ascites are defective in their ability to present antigens and prime T cells. Accordingly, inhibiting FASN by FASN inhibitor can partly restore the immunostimulatory activity of TIDCs and extended tumor control by evoking protective anti-tumor immune responses. Therefore, our data provide a mechanism by which ovarian cancer-intrinsic FASN oncogenic pathway induce the impaired anti-tumor immune response through lipid accumulation in TIDCs and subsequently T-cells exclusion and dysfunction. These results could further indicate that targeting the FASN oncogenic pathway concomitantly enhance anti-tumor immunity, thus offering a unique approach to ovarian cancer immunotherapy.

Keywords: ovarian cancer, FASN, Tumor-infiltrating dendritic cells, immune response, Immunity

Received: 31 Aug 2018; Accepted: 29 Nov 2018.

Edited by:

Patrik Andersson, Massachusetts General Hospital, Harvard Medical School, United States

Reviewed by:

Amorette Barber, Longwood University, United States
Chao Wang, Department of Neurology, Brigham and Women's Hospital, United States  

Copyright: © 2018 Jiang, Fang, Wang, Li and Wang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Dr. Li Jiang, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Department of Gynecology and Obstetrics, Shanghai, 200092, China, jiangli@xinhuamed.com.cn