Abstract P5-05-11: Growth hormone receptor silencing sensitizes triple negative breast cancer cells to chemotherapy

In this study we investigated the impact of GHR silencing in TNBC cells and further analyzed the possible mechanisms associated with GHR silencing induced sensitization. GHR was silenced using small interfering RNAs in metastatic breast cancer cells MDA MB 231 and MDA MB 468. Molecular analyses were performed to determine apoptosis, cytotoxicity, colony formation, invasion and migration in GHR knockdown cells. Silencing of GHR induced cytotoxicity and apoptosis in TNBC cells. Migratory and invasive potentials were drastically reduced in GHR silenced cells. Moreover, epithelial to mesenchymal transition markers were significantly down regulated by GHR siRNA treatment. GHR targeting significantly increased the efficiency of docetaxel against TNBC cells. Inhibition of GHR also inhibited the expression of BCRP, which is frequently associated with the development of chemoresistance in breast cancer. Further, treatment with GH induced the overexpression of drug transporter proteins involved in chemoresistance. Inhibition of GHR in breast cancer cells reverted the expression of these proteins and sensitized the cells to docetaxel. These findings support the hypothesis that targeting GHR could have a potential new therapeutic approach to overcome chemoresistance in TNBCs. Citation Format: Arunkumar Arumugam, Ramadevi Subramani, Sushmita Nandy, Rebecca Lopez-Valdez, Rajkumar Lakshmanaswamy. Growth hormone receptor silencing sensitizes triple negative breast cancer cells to chemotherap...
Source: Cancer Research - Category: Cancer & Oncology Authors: Tags: Poster Session Abstracts Source Type: research