Long noncoding RNA MAGI2-AS3 regulates the H₂O₂ level and cell senescence via HSPA8

Area of Science:

• Cell Biology
• Molecular Biology
• Aging Research

Background:

• Redox homeostasis is crucial for biological processes, but the role of long noncoding RNAs (lncRNAs) in redox regulation is underexplored.
• Cellular senescence, a hallmark of aging, is linked to altered redox states.

Purpose of the Study:

• To investigate the role of lncRNA MAGI2-AS3 in redox regulation and cellular senescence.
• To identify the molecular mechanisms by which MAGI2-AS3 influences oxidative stress and aging.

Main Methods:

• Utilized human fibroblasts (Fbs) as a replicative aging model.
• Quantified superoxide and hydrogen peroxide levels using dihydroethidium (DHE) and MitoSOX™ Red.
• Performed RNA pulldown, mass spectrometry, and photoactivatable ribonucleoside-enhanced crosslinking and immunoprecipitation (PAR-CLIP) to identify protein interactions.
• Investigated protein stabilization and degradation pathways.
• Assessed cell senescence and employed gene knockdown techniques.

Main Results:

• Downregulation of MAGI2-AS3 reduced superoxide and hydrogen peroxide levels in aging fibroblasts.
• MAGI2-AS3 was identified as an interactor of HSPA8 protein, stabilizing its levels by inhibiting proteasome degradation.
• MAGI2-AS3 knockdown delayed cell senescence, an effect dependent on HSPA8.
• The anti-aging mechanism involved the suppression of the ROS/MAP2K6/p38 signaling pathway.

Conclusions:

• lncRNA MAGI2-AS3 plays a significant role in regulating redox homeostasis and cellular senescence.
• Stabilization of HSPA8 protein by MAGI2-AS3 downregulation contributes to reduced oxidative stress and delayed aging.
• Targeting MAGI2-AS3 presents a potential therapeutic strategy for anti-aging interventions.