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Related Experiment Videos

Ascorbic acid modulates collagen type I gene expression by cells from an eye tissue--trabecular meshwork.

S Sawaguchi1, B Y Yue, I L Chang

  • 1Department of Ophthalmology and Visual Sciences, Lions of Illinois Eye Research Institute, Chicago.

Cellular and Molecular Biology
|September 1, 1992
PubMed
Summary

Ascorbic acid significantly increases type I collagen production in bovine trabecular meshwork cells. This suggests ascorbic acid plays a key role in regulating the extracellular matrix, impacting aqueous humor outflow.

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Area of Science:

  • Ophthalmology
  • Cell Biology
  • Biochemistry

Background:

  • The trabecular meshwork regulates aqueous humor outflow.
  • Ascorbic acid is a key component of aqueous humor.

Purpose of the Study:

  • To investigate the effect of ascorbic acid on type I collagen gene expression in bovine trabecular meshwork cells.
  • To understand ascorbic acid's role in extracellular matrix production.

Main Methods:

  • Bovine trabecular meshwork cells were cultured and treated with varying concentrations of ascorbic acid.
  • Collagenase assays, gel electrophoresis, fluorography, and cDNA/in situ hybridization were used to measure collagen production and mRNA levels.

Main Results:

  • Ascorbic acid treatment (100 and 250 µg/ml) enhanced (3H)proline incorporation into collagenous proteins.

Related Experiment Videos

  • A 2.6- to 4.9-fold increase in alpha 1 (I) and alpha 2(I) collagen chain production was observed.
  • Increased steady-state mRNA levels for pro alpha 1(I) chains confirmed gene expression changes.

    • Conclusions:

    • Ascorbic acid is a critical mediator of extracellular matrix production in trabecular meshwork cells.
    • Variations in ascorbic acid concentration may alter the composition and assembly of the trabecular meshwork extracellular matrix.
    • This has implications for understanding aqueous humor dynamics and ocular health.