Tumor Biology

, Volume 36, Issue 11, pp 8913–8924 | Cite as

Modulation of PKC signaling and induction of apoptosis through suppression of reactive oxygen species and tumor necrosis factor receptor 1 (TNFR1): key role of quercetin in cancer prevention

Research Article

Abstract

Cancer cells are characterized by increased production of reactive oxygen species (ROS) and an altered redox environment as compared to normal cells. Continuous accumulation of ROS triggers oxidative stress leading to hyper-activation of signaling pathways that promote cell proliferation, survival, and metabolic adaptation to the tumor microenvironment. Therefore, antioxidants are proposed to contribute to cancer prevention. Protein kinase C (PKC) is a crucial regulator of diverse cellular processes and contributes to cancer progression. The activation of PKC is partially dependent on ROS signaling. In the present study, cancer preventive activity of natural flavonoid quercetin is analyzed in ascite cells of Dalton’s lymphoma-bearing mice. The total ROS level and activity of PKC were downregulated after quercetin treatment in lymphoma-bearing mice. Quercetin modulates the expression of almost all isozymes of classical, novel, and atypical PKC as well as downregulates the level and expression of PKCα. Further, quercetin improves apoptotic potential, as observed by the levels of caspase 3, caspase 9, PARP, PKCδ, and nuclear condensation. Additionally, quercetin reduces cell survival and promotes death receptor-mediated apoptosis via differential localization of the TNFR1 level in ascite cells. The overall result suggests the cancer preventive activity of quercetin via the induction of apoptosis and modulates PKC signaling with the reduction of oxidative stress in ascite cells of lymphoma-bearing mice.

Keywords

ROS PKC Apoptosis Quercetin TNFR1 and Dalton’s lymphoma 

Notes

Acknowledgments

The research was supported by University Grants Commission (UGC), India. AKM thanks the Council of Scientific and Industrial Research (CSIR), India, for Senior Research Fellowship (CSIR Award No. File No: 09/013(0338)/2010-EMR-I).

Conflicts of interest

None

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Copyright information

© International Society of Oncology and BioMarkers (ISOBM) 2015

Authors and Affiliations

  1. 1.Biochemistry & Molecular Biology Laboratory, Centre of Advanced Study in ZoologyBanaras Hindu UniversityVaranasiIndia

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