Pyrroloquinoline quinone induces chondrosarcoma cell apoptosis by increasing intracellular reactive oxygen species

Area of Science:

• Biochemistry
• Cell Biology
• Oncology

Background:

• Pyrroloquinoline quinone (PQQ) is known to affect cancer cell apoptosis, but its precise mechanisms remain unclear.
• Chondrosarcoma is a rare bone cancer with limited treatment options.

Purpose of the Study:

• To investigate the role and mechanism of PQQ in inducing apoptosis in human chondrosarcoma SW1353 cells.
• To evaluate the anti-tumorigenic effects of PQQ in vivo.

Main Methods:

• Cell cytotoxicity assays and flow cytometry were used to assess cell death, apoptosis, and intracellular reactive oxygen species (ROS).
• Biochemical methods measured the activity and expression of superoxide dismutase (SOD)1, SOD2, and glutathione.
• In vivo experiments examined the effect of PQQ on transplanted tumor growth and DNA damage.

Main Results:

• PQQ significantly increased apoptosis in SW1353 cells in a concentration- and time-dependent manner.
• PQQ induced apoptosis by increasing intracellular ROS accumulation and decreasing the scavenging of free radicals.
• In vivo, PQQ inhibited tumor proliferation, promoted apoptosis, elevated ROS levels, and caused DNA damage.

Conclusions:

• PQQ effectively induces apoptosis in human chondrosarcoma cells through ROS generation and impaired antioxidant capacity.
• PQQ demonstrates anti-tumorigenic potential in vivo, warranting further investigation for chondrosarcoma treatment.