Changes in ionizing radiation dose rate affect cell cycle progression in adipose derived stem cells.

Area of Science:

• Biomedical physics
• Radiation oncology
• Stem cell biology

Background:

• Radiation therapy uses high-energy photons for cancer treatment, posing risks to healthy tissues.
• Adipose-derived stem cells (ADSCs) are easily obtainable mesenchymal stem cells crucial for tissue repair and regenerative medicine.
• ADSCs may be vulnerable to radiation therapy, particularly in cancers located in ADSC-rich tissues.

Purpose of the Study:

• To investigate the impact of clinically relevant radiation doses on ADSCs.
• To determine if varying dose rates affect ADSC response to ionizing radiation.

Main Methods:

• Exposing ADSCs to Cesium-137 gamma rays at a 2Gy dose.
• Administering radiation at low (1.40Gy/min) and high (7.31Gy/min) dose rates.
• Assessing ADSC proliferation, cell cycle, and overall function.

Main Results:

• ADSCs exhibited slowed proliferation and cell cycle arrest at 2Gy, but responses were less severe than in other stem cell types.
• Differences in dose rate within the tested range had minimal impact on ADSC function.
• ADSCs demonstrated resilience to radiation doses comparable to a single fraction of therapy.

Conclusions:

• ADSCs display a degree of radioresistance compared to other stem cell populations.
• Dose rate variations typical in preclinical irradiation do not significantly alter ADSC response.
• ADSCs remain a promising candidate for regenerative medicine applications, even in the context of radiation therapy.