Patient-derived iPSCs link elevated mitochondrial respiratory complex I function to osteosarcoma in Rothmund-Thomson...

Area of Science:

• Genetics
• Oncology
• Biochemistry

Background:

• Rothmund-Thomson syndrome (RTS) is a genetic disorder linked to increased cancer risk, particularly osteosarcoma in Type 2 patients with RECQL4 variants.
• RTS patient-derived cells are crucial for understanding disease mechanisms and developing targeted therapies.

Purpose of the Study:

• To investigate the molecular mechanisms underlying osteosarcoma development in RTS patients.
• To identify potential therapeutic targets for RTS-associated osteosarcoma.

Main Methods:

• Generated induced pluripotent stem cells (iPSCs) from RTS patients.
• Differentiated iPSCs into osteoblasts for functional and molecular analysis.
• Performed transcriptome analysis and metabolic assays.
• Utilized IACS-010759 to inhibit mitochondrial respiratory complex I and assess its effects.

Main Results:

• RTS osteoblasts exhibited impaired osteogenic differentiation and enhanced tumorigenicity.
• Upregulated mitochondrial respiratory complex I gene expression and function were observed in RTS osteoblasts.
• Inhibition of mitochondrial respiratory complex I suppressed proliferation, induced senescence, and altered signaling pathways in RTS osteoblasts.

Conclusions:

• Mitochondrial respiratory complex I is a key player in RTS-associated osteosarcoma pathogenesis.
• Targeting mitochondrial respiratory complex I presents a promising therapeutic avenue for RTS-associated osteosarcoma.