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Regulation of bovine corneal endothelial cell cycle by transforming growth factor-beta

Yutaka Motegi1, Tomohiro Usui, Kouichi Ishida

  • 1Department of Ophthalmology, University of Tokyo School of Medicine, Tokyo, Japan.

Acta Ophthalmologica Scandinavica
|September 27, 2003
PubMed
Abstract

Insights

Transforming growth factor-beta (TGF-beta) accelerates corneal endothelial cell cycle progression. This occurs via protein kinase C pathways, highlighting cross-talk between TGF-beta and other cytokines.

Area of Science:

  • Ophthalmology
  • Cell Biology
  • Molecular Biology

Background:

  • The transforming growth factor-beta (TGF-beta) family, including TGF-beta1, TGF-beta2, and TGF-beta3, are multifunctional proteins found in ocular tissues.
  • TGF-beta plays a role in regulating cell differentiation, proliferation, and functions, and is present in aqueous humor, influencing corneal endothelial cells.

Purpose of the Study:

  • To investigate the mechanism by which TGF-beta regulates the cell cycle in cultured corneal endothelial cells.
  • To understand the signal transduction pathways involved in TGF-beta-mediated cell cycle regulation.

Main Methods:

  • Investigated TGF-beta receptor expression using affinity cross-linking and immunoprecipitation.
  • Determined cell cycle entry into S-phase via 5-bromo-2'-deoxyuridine (BrdU) incorporation.
  • Explored signal transduction pathways using blocking agents for protein kinase transducers.

Main Results:

  • Cultured bovine corneal endothelial cells express TGF-beta type 1 and type 2 receptors, and endoglin.
  • TGF-beta1 and TGF-beta2 stimulated cell cycle progression to S-phase in confluent cells.
  • This stimulation involved platelet-derived growth factor-B (PDGF-B) chain production and protein kinase C activation.

Conclusions:

  • TGF-beta accelerates cell cycle progression from G0/G1 to S-phase in cultured corneal endothelial cells.
  • The mechanism involves protein kinase C pathways, indicating cross-talk between TGF-beta and other cytokines.
  • The experimental conditions may be valuable for studying complex cytokine and growth factor interactions.

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