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TGFbeta promotes Wnt expression during cataract development

C C W Chong1, R J W Stump, F J Lovicu

  • 1Save Sight Institute, The University of Sydney, Sydney NSW 2001, Australia.

Experimental Eye Research
|September 16, 2008
PubMed

Insights

Transforming growth factor beta (TGFbeta) triggers lens epithelial cells to undergo epithelial mesenchymal transition (EMT), a process implicated in fibrosis and posterior capsular opacification (PCO). This study reveals Wnt signaling is upregulated during TGFbeta-induced EMT in the lens, suggesting a role in cataract development.

Area of Science:

  • Ophthalmology
  • Cell Biology
  • Molecular Biology

Background:

  • Transforming growth factor beta (TGFbeta) is known to induce epithelial mesenchymal transition (EMT) in lens epithelial cells, leading to fibrotic changes and posterior capsular opacification (PCO).
  • Understanding the signaling pathways regulated by TGFbeta is crucial for developing strategies to block its damaging effects in the lens.
  • Wnt signaling pathways are implicated in TGFbeta-induced EMT in various cell types, prompting investigation into their role in the lens.

Purpose of the Study:

  • To investigate the potential role of Wnt signaling in regulating TGFbeta-induced epithelial mesenchymal transition (EMT) and subsequent fibrotic changes in the lens.
  • To determine if specific Wnt ligands and their Frizzled receptors are upregulated during TGFbeta-induced EMT and cataract development in ocular models.

Main Methods:

  • Utilized reverse transcription-polymerase chain reaction (RT-PCR) to assess Wnt and Frizzled gene expression.
  • Employed in situ hybridization to localize Wnt and Frizzled mRNAs within lens tissues.
  • Used immunolocalization techniques to detect Wnt and Frizzled protein expression.
  • Examined both rat in vitro and mouse in vivo cataract models.

Main Results:

  • Demonstrated significant upregulation of Wnts 5a, 5b, 7b, 8a, 8b, and their corresponding Frizzled receptors in association with TGFbeta-induced EMT and cataract development.
  • Observed similar expression profiles for Wnt and Frizzled mRNAs and proteins in both rat in vitro and mouse in vivo models.
  • The study indicates that Wnt signaling is actively involved in the fibrotic processes occurring in the lens.

Conclusions:

  • Wnt signaling pathways play a significant role in TGFbeta-induced epithelial mesenchymal transition (EMT) within the lens.
  • The observed upregulation of Wnt ligands and Frizzled receptors suggests their involvement in the development of fibrotic plaques and posterior capsular opacification (PCO).
  • Further research is needed to elucidate whether canonical (beta-catenin/TCF) or non-canonical Wnt pathways are activated in this context.

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