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Cellular processing of myocilin.

Ye Qiu1, Xiang Shen1, Rajalekshmy Shyam1

  • 1Department of Ophthalmology and Visual Sciences, University of Illinois at Chicago College of Medicine, Chicago, Illinois, United States of America.

Plos One
|April 16, 2014
PubMed
Summary
This summary is machine-generated.

Myocilin protein turnover in trabecular meshwork cells involves ubiquitin-proteasome and lysosomal pathways. Mutations or upregulation compromise these systems, inducing autophagy, which is key for understanding glaucoma therapies.

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Area of Science:

  • Ophthalmology
  • Molecular Biology
  • Cell Biology

Background:

  • Myocilin (MYOC) gene mutations are linked to juvenile and adult-onset open-angle glaucoma.
  • Specific mutations like Pro370Leu (P370L) and Gln368stop (Q368X) have been identified in glaucoma patients.
  • Investigating myocilin processing in human trabecular meshwork (TM) cells and RGC5 cell lines is crucial.

Purpose of the Study:

  • To investigate the processing and degradation pathways of myocilin in human TM cells.
  • To understand how MYOC mutations affect protein turnover and cellular pathways.
  • To identify potential therapeutic targets for myocilin-related glaucoma.

Main Methods:

  • Utilized turnover and photoactivation experiments in human TM cells.
  • Employed inducible, stable RGC5 cell lines overexpressing wild-type and mutant myocilin-GFP fusion proteins.
  • Analyzed protein ubiquitination, lysosomal and proteasomal inhibition, and autophagy markers (LC3).

Main Results:

  • Endogenous myocilin in TM cells is a short-lived protein degraded via ubiquitin-proteasome and lysosomal pathways.
  • Lysosomal and proteasomal inhibitors increased endogenous myocilin levels, indicating their role in degradation.
  • Mutant and overexpressed myocilin prolonged turnover, compromised proteasome function, induced autophagy, and altered PSMB5 and LC3 levels.

Conclusions:

  • Myocilin turnover in homeostasis relies on ubiquitin-proteasome and lysosomal pathways.
  • Upregulation or mutation of myocilin disrupts these pathways, leading to compromised proteasome function and induced autophagy.
  • Understanding these degradation mechanisms is vital for developing novel therapeutic strategies for myocilin-related glaucoma.