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  • Poster presentation
  • Open Access

Development and stability of Th17 cells in ovarian cancer requires nitric oxide and endogenous NOS2 activity in cancer-associated CD4+ T cells

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Journal for ImmunoTherapy of Cancer20131 (Suppl 1) :P146

  • Published:


  • Nitric Oxide
  • Cancer Patient
  • Signaling Pathway
  • Ovarian Cancer
  • Therapeutic Target

Th17 cells play reciprocal roles in different forms and at different stages of cancer. We report that the presence of Th17 cells in ovarian cancer ascites correlates with local expression of nitric oxide synthase-2 (NOS2). Furthermore, the development of RORγt+IL-23R+IL-17+ Th17 cells from human naive-, memory- or tumor-infiltrating CD4+ T cells critically depends on NO and endogenous NOS2 induced in CD4+ T cells by Th17-inducing cytokines (IL-1β/IL-6/IL-23) or by cancer-associated IL-1β/IL-6/IL-23/NO-producing MDSCs. Inhibition of NOS2 or its downstream cGMP/cGK signaling pathway abolishes de novo induction of Th17 cells. Moreover, even short-term blockade of NOS/cGMP suppresses the IL-17 production by established Th17 cells isolated from ovarian cancer patients, demonstrating the novel key role of NOS/cGMP in Th17 cell physiology and providing for new therapeutic targets to manipulate Th17- and NOS/cGMP-associated immunity in precancerous lesions and advanced cancer.

Authors’ Affiliations

Department of Surgery, University of Pittsburgh, Pittsburgh, PA, USA
Department of Immunology, University of Pittsburgh, Pittsburgh, PA, USA
Department of Infectious Diseases and Microbiology, University of Pittsburgh, Pittsburgh, PA, USA
Magee-Womens Research Institute Ovarian Cancer Center of Excellence, Pittsburgh, PA, USA
Peritoneal/Ovarian Cancer Specialty Care Center, Pittsburgh, PA, USA
University of Pittsburgh Cancer Institute, University of Pittsburgh, Pittsburgh, PA, USA
Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
Departments of Gynecologic Oncology and Immunology, Roswell Park Cancer Institute, Buffalo, NY, USA


© Obermajer et al; licensee BioMed Central Ltd. 2013

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.