Adipose mesenchymal stromal cells response to ionizing radiation

Area of Science:

• Cell Biology
• Radiation Biology
• Regenerative Medicine

Background:

• Adipose tissue-derived mesenchymal stromal cells (aMSCs) are being explored for therapeutic applications.
• Understanding their response to ionizing radiation (IR) is crucial for their use in radiation oncology.

Purpose of the Study:

• To evaluate the biological response of aMSCs to ionizing radiation (IR).
• To assess the functionality, phenotype, and DNA damage response of irradiated aMSCs.

Main Methods:

• Irradiated and non-irradiated mouse aMSCs were characterized for functionality and phenotype.
• Clonogenic capacity was assessed and compared to breast cancer cells (4T1) and fibroblasts (NIH3T3-wt).
• IR-induced DNA damage response, apoptosis, cell cycle dynamics, and gene/protein expression were investigated.

Main Results:

• Irradiated aMSCs retained multi-lineage differentiation potential (adipocytes, chondrocytes, osteocytes) and mesenchymal stromal cell (MSC) surface antigen expression.
• Irradiated aMSCs demonstrated superior clonogenic survival and plating efficiency compared to 4T1 and NIH3T3-wt cells.
• aMSCs exhibited a faster and more efficient IR-induced DNA damage response, with rapid upregulation of DNA repair genes and earlier G2/M cell cycle arrest.

Conclusions:

• aMSCs display a robust and efficient DNA damage repair mechanism following IR exposure.
• Their stable phenotypical characteristics and differentiation potential suggest suitability for cell therapy.
• aMSCs show promise as candidates for regenerative medicine applications in radiation oncology.