Exosome Release by Glucose Deprivation Is Important for the Viability of TSC-Null Cells

Area of Science:

• Cell Biology
• Molecular Biology
• Biochemistry

Background:

• Exosome release is crucial in physiological and pathological processes, reflecting health, disease, and nutrient stress.
• Tuberous Sclerosis Complex (TSC) regulates cell viability by inhibiting mTORC1 under glucose deprivation, but the exact mechanism is unclear.

Purpose of the Study:

• To investigate the role of exosome release in regulating cell death of TSC-null cells under glucose deprivation.
• To elucidate the mechanism by which mTORC1 inhibition affects cell viability in TSC-null cells during glucose deprivation.

Main Methods:

• Utilized TSC-null cell models.
• Applied rapamycin to inhibit mTORC1.
• Assessed exosome biogenesis and secretion.
• Measured cell viability.
• Employed exosome release inhibitors.

Main Results:

• mTORC1 inhibition significantly increased exosome biogenesis, secretion, and cell viability in TSC-null cells.
• The enhanced cell viability due to mTORC1 inhibition was reduced by exosome release inhibitors.
• Exosome release was demonstrated to regulate glucose deprivation-induced cell death in TSC-null cells.

Conclusions:

• Exosome release plays a key role in regulating cell death in TSC-null cells under glucose deprivation.
• mTORC1 inhibition promotes cell survival in TSC-null cells by increasing exosome release.
• Inhibiting exosome release may represent a therapeutic strategy for reducing cell growth in TSC-null cells.