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Related Experiment Videos

Increased clusterin expression in Fuchs' endothelial dystrophy.

Ula V Jurkunas1, Maya S Bitar, Ian Rawe

  • 1Schepens Eye Research Institute, Boston, Massachusetts, USA. ula_jurkunas@meei.harvard.edu

Investigative Ophthalmology & Visual Science
|April 2, 2008
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

Vesicular Tubular Clusters01:45

Vesicular Tubular Clusters

After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi.
With the help of motor proteins such...

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Clusterin (CLU) protein and mRNA expression are significantly elevated in Fuchs' endothelial dystrophy (FED) corneal tissue, suggesting a role in disease pathogenesis.

Area of Science:

  • Ophthalmology
  • Proteomics
  • Molecular Biology

Background:

  • Fuchs' endothelial dystrophy (FED) is a progressive corneal disease affecting the endothelium.
  • Clusterin/apoJ (CLU) is a glycoprotein with diverse cellular functions.
  • Understanding CLU's role in FED is crucial for elucidating disease mechanisms.

Purpose of the Study:

  • To investigate differential CLU expression in normal versus FED corneal endothelium.
  • To compare various CLU forms (presecretory, secretory, nuclear) in normal and FED tissues.
  • To analyze CLU mRNA and protein expression and localization in FED.

Main Methods:

  • Proteomic analysis of human corneal endothelial cells and Descemet's membrane (HCEC-DM) from FED and normal corneas.
  • Western blot analysis to quantify presecretory (pre-sCLU), secretory (sCLU), and nuclear (nCLU) protein levels.

Related Experiment Videos

  • RT-PCR for CLU mRNA expression and immunocytochemistry/confocal microscopy for subcellular localization.

    • Main Results:

    • Proteomic analysis indicated increased CLU expression in FED HCEC-DM.
    • Western blot showed a 5.2-fold increase in pre-sCLU and elevated nCLU in FED.
    • RT-PCR revealed significantly increased CLU mRNA in FED but not PBK samples; CLU localized to guttae and endothelial cell nuclei in FED.

    Conclusions:

    • CLU expression is markedly elevated in FED-affected corneal endothelium.
    • This suggests a dysregulation of endothelial cell function contributing to FED pathogenesis.
    • Further research is warranted to explore CLU's specific role in FED development.