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Published on: April 6, 2022
The Rubicon-WIPI axis regulates exosome biogenesis during ageing
Kyosuke Yanagawa1,2, Akiko Kuma1,3, Maho Hamasaki1,4
1Department of Genetics, Graduate School of Medicine, Osaka University, Suita, Japan.
The Rubicon-WIPI pathway regulates exosome release and biogenesis. This pathway influences cellular senescence and longevity by controlling exosome microRNA content and quantity, particularly with aging.
Area of Science:
- Cell Biology
- Molecular Biology
- Autophagy Research
Background:
- Exosomes mediate intercellular communication via intraluminal vesicles.
- The precise mechanisms linking autophagy and exosome biogenesis remain unclear.
- Autophagy regulators are increasingly implicated in exosome pathway control.
Purpose of the Study:
- To investigate the role of autophagy-related factors in exosome biogenesis and release.
- To elucidate the molecular mechanism by which Rubicon influences exosome formation.
- To determine the impact of the Rubicon-WIPI axis on age-dependent exosome changes.
Main Methods:
- Genome-wide RNA interference screening for autophagy factors.
- Endosomal protein recruitment assays and interactome analysis.
- Small RNA sequencing of serum exosomes from mice.
Main Results:
- Rubicon, an autophagy negative regulator, is essential for exosome release.
- Rubicon recruits WIPI2d to endosomes, promoting exosome biogenesis.
- Rubicon controls age-dependent increases in exosome release and alters exosomal microRNA profiles.
Conclusions:
- The Rubicon-WIPI axis is a critical regulator of exosome biogenesis.
- This axis dictates age-related alterations in exosome quantity and quality.
- Rubicon influences exosomal microRNAs linked to senescence and longevity pathways.
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