Indole-3-Carbinol Induces Apoptosis in Human Osteosarcoma MG-63 and U2OS Cells

Area of Science:

• Oncology
• Molecular Biology
• Cell Biology

Background:

• Osteosarcoma is a primary bone cancer with limited treatment options.
• Indole-3-carbinol (I3C), a compound found in cruciferous vegetables, has demonstrated potential anticancer properties.
• Investigating novel therapeutic agents for osteosarcoma is crucial for improving patient outcomes.

Purpose of the Study:

• To investigate the anticancer effects of indole-3-carbinol (I3C) on human osteosarcoma cell lines (MG-63 and U2OS).
• To elucidate the mechanisms underlying I3C-induced cell death in osteosarcoma.

Main Methods:

• Cell viability was assessed using MTT, WST-1, and colony formation assays.
• Cell migration was evaluated using a wound healing assay.
• Apoptosis induction was analyzed by fluorescence-activated cell sorting (FACS) and terminal deoxynucleotidyl transferase- (TdT-) mediated dUTP-biotin nick-end labeling (TUNEL) assay.
• Western blotting was employed to examine the expression of apoptosis-related proteins (caspases, PARP, FOXO3, Bax, Bim, Akt, JNK, p38, ERK, Bcl-xL).

Main Results:

• I3C significantly inhibited the migration and decreased the viability of MG-63 and U2OS osteosarcoma cells.
• I3C treatment induced apoptosis and DNA fragmentation in a dose- and time-dependent manner.
• I3C upregulated pro-apoptotic proteins (activated caspases-3, -7, -9, PARP, FOXO3, Bax, Bim) and downregulated anti-apoptotic proteins (Akt, JNK, p38, p-ERK, Bcl-xL).
• FOXO3 activation was identified as a key mediator in I3C-induced apoptosis.

Conclusions:

• Indole-3-carbinol (I3C) exhibits significant anticancer potential against human osteosarcoma cells.
• I3C effectively induces apoptosis through the activation of intrinsic apoptotic pathways, involving FOXO3, caspases, and modulation of Bcl-2 family proteins.
• I3C represents a promising therapeutic candidate for osteosarcoma treatment, warranting further investigation.