Deregulation in cell proliferation, oxidative status, antiapoptosis and survival are involved in development of cancer. The cellular signaling cascades mediated by Phosphatidylinositol 3-kinase (PI3K) with their ability to stimulate cell proliferation and suppress apoptosis, has been considered to play key role in tumor initiation, promotion, and progression. Therefore, use of inhibitors or antioxidants like natural flavonoids could be promising strategy to target PI3K pathway for suppression of carcinogenic process. The present study was aimed to investigate the anti-cancer activity of quercetin, a natural flavonoid and PI-103, a synthetic inhibitor in transplantable murine T-cell lymphoma. Cytotoxicity, apoptotic potential, cell survival, cell proliferation as well as antioxidant defense are evaluated in ascite cells of murine T-cell lymphoma in vivo and in primary culture. Significant decline in level of AKT1, PKCα, COX 2 as well as regulatory domain of PI3K (p85α), AKT1 and Bad, suggested implication of quercetin in regression of lymphoma by down regulation of cell proliferation and survival. Improvement of active PKCδ, p53, active caspase 3, 9 and cleaved PARP supported its cell apoptotic mechanism in cancer prevention. Additionally, decreased ROS level and LDH A activity contributes to reduced survival of cancer cells. Inhibition of p110α by PI-103 resulted in suppression of phospho-AKT and p85α level in primary culture. Modulation of various molecular targets including PI3K/AKT signaling by quercetin and PI-103 in vitro and in vivo tumor models suggests the importance and contribution of antioxidant quercetin in the prevention of cancer.

Citation Format: Akhilendra Kumar Maurya, Manjula Vinayak. Decline in the growth of murine T-cell lymphoma via modulation of PI3K signaling pathway: Key role of quercetin and PI-103. [abstract]. In: Proceedings of the AACR Special Conference: Targeting the PI3K-mTOR Network in Cancer; Sep 14-17, 2014; Philadelphia, PA. Philadelphia (PA): AACR; Mol Cancer Ther 2015;14(7 Suppl):Abstract nr A07.