Quercetin regulates insulin like growth factor signaling and induces intrinsic and extrinsic pathway mediated apoptosis in androgen independent prostate cancer cells (PC-3).

Molecular and Cellular Biochemistry
Kalimuthu SenthilkumarJagadeesan Arunakaran

Abstract

Progression of prostate cancer is facilitated by growth factors that activate critical signaling cascades thereby promote prostate cancer cell growth, survival, and migration. To investigate the effect of quercetin on insulin-like growth factor signaling and apoptosis in androgen independent prostate cancer cells (PC-3), IGF-IR, PI-3K, p-Akt, Akt, cyclin D1, Bad, cytochrome c, PARP, caspases-9 and 10 protein levels were assessed by western blot analysis. Mitochondrial membrane potency was detected by rhodamine-123 staining. Quercetin induced caspase-3 activity assay was performed for activation of apoptosis. Further, RT-PCR was also performed for Bad, IGF-I, II, IR, and IGFBP-3 mRNA expression. Quercetin significantly increases the proapoptotic mRNA levels of Bad, IGFBP-3 and protein levels of Bad, cytochrome C, cleaved caspase-9, caspase-10, cleaved PARP and caspase-3 activity in PC-3 cells. IGF-IRβ, PI3K, p-Akt, and cyclin D1 protein expression and mRNA levels of IGF-I, II and IGF-IR were decreased significantly. Further, treatment with PI3K inhibitor (LY294002) and quercetin showed decreased p-Akt levels. Apoptosis is confirmed by loss of mitochondrial membrane potential in quercetin treated PC-3 cells. This study suggests t...Continue Reading

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