Carnitine palmitoyltransferase 1C contributes to progressive cellular senescence

Area of Science:

• Cell Biology
• Molecular Biology
• Cancer Research

Background:

• Stable transfection and antibiotic selection can induce cellular senescence, but the mechanisms are unclear.
• Cellular senescence is a state of irreversible cell cycle arrest with implications for aging and cancer.

Purpose of the Study:

• To elucidate the mechanisms underlying stable transfection-induced cellular senescence in PANC-1 cells.
• To identify key molecular regulators involved in this process and their functional consequences.

Main Methods:

• Stable transfection of empty vector in PANC-1 cells.
• Metabolomic analysis to identify altered metabolites and pathways.
• Gene expression analysis of key senescence-related factors (CPT1C, PPARα, TP53/CDKN1A).
• Functional assays assessing mitochondrial function, cell survival, and tumorigenesis.

Main Results:

• Stable transfection induced senescence in PANC-1 cells.
• Decreased levels of acylcarnitines and carnitine palmitoyltransferase 1C (CPT1C) were observed in senescent cells.
• Reduced CPT1C expression led to mitochondrial dysfunction, impaired cell survival, and reduced tumorigenesis.
• CPT1C gain-of-function restored mitochondrial activity.
• Key senescence regulators PPARα and TP53/CDKN1A were downregulated.

Conclusions:

• CPT1C is a critical regulator of stable transfection-induced senescence in PANC-1 cells, affecting mitochondrial function and metabolic reprogramming.
• Inhibition of CPT1C may represent a novel therapeutic strategy to target pancreatic tumorigenesis.