Black pepper and piperine induce anticancer effects on leukemia cell line

Area of Science:

• Pharmacology
• Molecular Biology
• Cancer Research

Background:

• Black pepper, known as the "king of spices," is a common culinary ingredient.
• Alkaloid piperine is the main bioactive constituent of black pepper.

Purpose of the Study:

• To evaluate the anticancer potential of black pepper extract and piperine against human leukemia K-562 cells.
• To investigate the molecular mechanisms underlying their cytotoxic and anti-proliferative effects.

Main Methods:

• Gas chromatography-mass spectrometry (GC-MS) for piperine identification.
• Cytotoxicity assays, fluorescent microscopy, and flow cytometry to assess apoptosis and reactive oxygen species (ROS) generation.
• Gene expression analysis (Bax, caspase-3, caspase-9, Bcl-2) and proliferating cell nuclear antigen (PCNA) detection.
• Molecular docking studies with PCNA, Bcl-2, and Apaf-1 proteins.

Main Results:

• Black pepper methanolic extract (BP-M) and piperine (PIP) exhibited significant cytotoxic effects on K-562 cells.
• Both BP-M and PIP induced apoptosis, characterized by apoptotic bodies and nuclear condensation.
• Increased ROS generation and modulation of apoptosis-related gene expression (upregulated Bax, caspase-3, caspase-9; downregulated Bcl-2) were observed.
• Anti-proliferative effects were confirmed by reduced PCNA expression.
• Molecular docking supported PIP's interaction with PCNA, Bcl-2, and Apaf-1.

Conclusions:

• Black pepper and piperine possess significant anticancer properties against human leukemia cells.
• These findings suggest black pepper's potential as a nutraceutical for preventing chronic myeloid leukemia progression.
• The study highlights the therapeutic potential of natural compounds in cancer treatment.