Piperine Induces Apoptosis and Cell Cycle Arrest via Multiple Oxidative Stress Mechanisms and Regulation of PI3K/Akt and MAPK Signaling in Colorectal Cancer Cells

Area of Science:

• Biochemistry
• Molecular Biology
• Cancer Research

Background:

• Piperine, a phytochemical alkaloid, demonstrates anticancer potential.
• Colorectal cancer (CRC) remains a significant global health concern.
• Understanding piperine's mechanisms in CRC is crucial for therapeutic development.

Purpose of the Study:

• To elucidate the mechanisms of piperine-induced apoptosis in colorectal cancer (CRC) cells.
• To investigate the role of oxidative stress and specific signaling pathways in piperine's effects.
• To evaluate piperine's efficacy across various CRC cell lines.

Main Methods:

• MTT assay and flow cytometry were used to assess cell viability and apoptosis.
• Gene overexpression and Western blot analysis identified key molecular players.
• Reactive oxygen species (ROS) generation was quantified.
• Specific pathway inhibitors and activators were employed.

Main Results:

• Piperine significantly reduced viability and induced G1 cell cycle arrest and apoptosis in DLD-1, SW480, HT-29, and Caco-2 cells.
• Increased intracellular ROS generation was observed, linked to mitochondrial complex III, NADPH oxidase, and xanthine oxidase.
• Piperine inhibited the PI3K/Akt pathway and activated p38 and ERK signaling.
• Pharmacological interventions and gene manipulation confirmed the involvement of these pathways.

Conclusions:

• Piperine induces apoptosis in CRC cells via a complex oxidative stress mechanism.
• Modulation of PI3K/Akt and ERK signaling pathways is critical to piperine's action.
• This study provides novel insights into piperine's anticancer effects in CRC.