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Related Experiment Videos

Transforming growth factor beta isoforms in human optic nerve heads.

J D Pena1, A W Taylor, C S Ricard

  • 1Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, St Louis 63110, USA.

The British Journal of Ophthalmology
|July 9, 1999
PubMed
Summary

Transforming growth factor beta 2 (TGF-beta 2) is highly expressed in fetal and glaucomatous optic nerve heads, suggesting its role in development and glaucoma pathogenesis. This study investigated TGF-beta isoforms in optic nerve heads.

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Area of Science:

  • Ophthalmology
  • Cell Biology
  • Molecular Biology

Background:

  • Transforming growth factor beta (TGF-beta) isoforms are crucial signaling molecules.
  • Their role in the optic nerve head, particularly in glaucoma, is not fully understood.
  • Optic nerve head remodeling is implicated in glaucoma pathogenesis.

Purpose of the Study:

  • To investigate the presence and localization of TGF-beta isoforms (TGF-beta 1, TGF-beta 2, TGF-beta 3) in human fetal, normal adult, and glaucomatous optic nerve heads.
  • To determine if TGF-beta synthesis and gene expression differ across these conditions.

Main Methods:

  • Immunohistochemistry was used to localize TGF-beta isoforms in optic nerve head tissues.
  • Optic nerve heads were cultured to assess TGF-beta release in the supernatant via bioassay.

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  • Semiquantitative RT-PCR was employed to analyze TGF-beta 2 gene expression.

    • Main Results:

    • TGF-beta 2 was intensely localized in astrocytes of glaucomatous optic nerve heads, while TGF-beta 1 was found in blood vessels.
    • Normal adult optic nerve heads showed minimal TGF-beta expression.
    • Glaucomatous and fetal optic nerve heads released significantly higher levels of TGF-beta 2 compared to normal adult tissues.
    • TGF-beta 1 was undetectable by bioassay in all tested samples.
    • No significant increase in TGF-beta 2 gene expression was observed, suggesting post-transcriptional regulation.

    Conclusions:

    • TGF-beta 2 is abundantly produced in fetal and glaucomatous optic nerve heads, likely through post-transcriptional regulation.
    • TGF-beta 2 may play a role in optic nerve head development.
    • In glaucoma, TGF-beta 2 could mediate astrocyte activation and extracellular matrix remodeling in the lamina cribrosa.