Reversible ALKBH5 cytosolic aggregation accelerates cellular senescence

Area of Science:

• Epigenetics
• Molecular Biology
• Aging Research

Background:

• Cellular senescence is a key factor in aging and age-related diseases.
• The precise role of ALKBH5, an m6A demethylase, in cellular senescence is not fully understood.

Purpose of the Study:

• To elucidate the mechanism by which ALKBH5 influences cellular senescence.
• To identify potential therapeutic strategies targeting ALKBH5 for aging and age-related diseases.

Main Methods:

• Investigated the aggregation of ALKBH5 in the cytoplasm and its effect on m6A modification.
• Examined the interaction between ALKBH5, Nucleoporin p62 (Nup62), and nuclear translocation.
• Utilized m6A-labeled RNA administration and NLS-ALKBH5 to modulate ALKBH5 localization and senescence.

Main Results:

• ALKBH5 cytoplasmic aggregation promotes cellular senescence by causing cytosolic retention and m6A dysregulation of Cdk2 RNA.
• ALKBH5 aggregation creates a feedback loop that exacerbates m6A imbalance.
• ALKBH5 nuclear translocation depends on binding Nup62; aggregation traps ALKBH5 and Nup62 in the cytoplasm, inhibiting nuclear entry and inducing senescence.

Conclusions:

• ALKBH5 aggregation in the cytoplasm is a novel mechanism driving cellular senescence.
• Targeting ALKBH5 aggregation and restoring its nuclear entry presents a promising therapeutic strategy for aging and age-related diseases.