2020 Mentored Investigator Grant Recipient — Duygu Ozmadenci, PhD

Duygu Ozmadenci, PhD

University of California - San Diego

Sensitizing Ovarian Cancer to Immunotherapies

Project Summary

Recent advances in immunotherapy hold the promise to one day permit a cure for ovarian cancer.  Nonetheless, in clinical trials, ovarian cancer has so far been nonresponsive to immunotherapy approaches, suggesting that the relatively “direct” approach of using a single immune checkpoint blocker is insufficient in ovarian cancer.  

My studies have focused on a gene that is gained in more than 70% of women with high grade serous ovarian cancer.  The gene codes for the focal adhesion kinase (FAK) protein, and most studies to date have focused on its ability to help tumor growth or drug resistance.  Using a new preclinical model I codeveloped, which mimics the human disease in many aspects of gene gain, loss and overall aggression, I found that FAK expression in the tumors shapes their interaction with the local microenvironment.  Importantly , the presence of FAK led to signaling that caused factors to be secreted which are known to suppress the immune system. When I knocked out the gene encoding FAK, mutated it, or used newly developed drugs that target it, we found that the levels of these immune suppressing factors dropped dramatically, tumors were much smaller, and I could detect active immune cells.  In the studies proposed here, I am seeking to better characterize the factors which FAK elevates to block the immune system, and to compare my results to other preclinical models, which I will treat with the FAK inhibitor.  I believe these studies will allow me to identify a panel of key factors that block the immune response, many of which may be targetable alone or in conjunction with drugs that target FAK. 

This grant was made possible by generous donations from Gary Ockey, in memory of Ann Virginia Zeidman, and Ovarian Cycle Tampa.

Bio

Dr. Duygu Ozmadenci is a postdoctoral research fellow at the University of California, San Diego Moores Cancer Center. Born in a small town on the Black Sea region of Turkey, Duygu attended the prestigious Lyceum Galatasaray and Istanbul University before moving to France for graduate school. Receiving her Master’s degree from Université Réne Déscartes (Université Paris V) with high honors, she then moved to Université de Lyon and the Cancer Research Center of Lyon for her graduate studies on the regulation of cell plasticity and pluripotency. She received two consecutive national (ARC) fellowships during her doctoral studies, identifying novel signaling pathways involved in stem cell potency regulation and maintenance. During her doctoral studies, she presented her findings at international meetings in Beijing and Paris. She was awarded her PhD degree at the end of 2017 and next moved to the University of San Diego, California for postdoctoral studies. Working in the UCSD Moores Cancer Center, her current research focuses on focal adhesion kinase (FAK) signaling. The gene encoding FAK is found to be amplified in ~70% of women with serous ovarian cancer, regulates the WNT/b-catenin pathway, promotes stemness and chemotherapy resistance. Working together with other members of the division of gynecologic oncology, and with the assistance of a corporate partner (Verastem), Duygu has identified new roles for FAK in the modulation of the ovarian tumor microenvironment. Her goals are to understand how FAK promotes ovarian tumor escape from immune attack, and to establish new combinatory therapies including FAK inhibitors as immunomodulatory agents.