Apoptotic effects of curcumin on human osteosarcoma U2OS cells

Area of Science:

• Biochemistry
• Molecular Biology
• Cancer Research

Background:

• Curcumin, derived from Curcuma longa, possesses known antioxidant, anti-inflammatory, and anti-cancer properties.
• Osteosarcoma is a primary bone cancer with significant mortality rates.

Purpose of the Study:

• To investigate the potential of curcumin to induce apoptosis in a human osteosarcoma cell line (U2OS).

Main Methods:

• Assessed curcumin's effect on U2OS cells using morphological analysis, Hoechst 33258 staining, and DNA ladder formation.
• Evaluated cell viability via MTT assay, cell-cycle distribution, apoptosis, and related protein expression (Bax, Bak, Bcl-2, Bad, Bcl-X(L)) using flow cytometry and western blotting.
• Measured mitochondrial membrane potential, cytochrome C release, and caspase-3 activity.

Main Results:

• Curcumin demonstrated dose- and time-dependent growth inhibition and induced G1 cell-cycle arrest and apoptosis in U2OS cells.
• Apoptosis was associated with altered expression of Bcl-2 family proteins (up-regulation of Bax, Bak, p-Bad; down-regulation of Bcl-2).
• Curcumin treatment led to decreased mitochondrial membrane potential, increased cytochrome C release, and activated caspase-3.

Conclusions:

• Curcumin effectively induces apoptosis in human osteosarcoma cells through multiple molecular pathways.
• These pathways involve modulation of Bcl-2 family proteins, mitochondrial integrity, and caspase activation.