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Over-expression of translationally controlled tumor protein in lens epithelial cells seems to be associated with

Min-Jeong Kim1, Jungmook Lyu, Kyu-Been Sohn

  • 1College of Pharmacy, Center for Cell Signaling & Drug Discovery Research, Ewha Womans University, Seoul, Korea.

Transgenic Research
|May 30, 2009
PubMed

Insights

Translationally Controlled Tumor Protein (TCTP) causes cataracts by inhibiting Na,K-ATPase, leading to calcium imbalance in lens cells. TCTP-overexpressing mice showed a higher incidence of cataracts, confirming its role in lens opacification.

Area of Science:

  • Ophthalmology
  • Molecular Biology
  • Cardiovascular Science

Background:

  • Na,K-ATPase inhibition disrupts lens homeostasis, causing opacification via ion imbalance and cell damage.
  • Translationally Controlled Tumor Protein (TCTP) was previously identified as a repressor of Na,K-ATPase.
  • TCTP overexpression in mice induces hypertension by inhibiting vascular Na,K-ATPase and increasing intracellular calcium.

Purpose of the Study:

  • To investigate the role of TCTP in cataract formation.
  • To confirm TCTP's mechanism in causing intracellular calcium mobilization in lens epithelial cells.
  • To assess the cataractogenic potential of TCTP in vivo.

Main Methods:

  • Utilized a human lens epithelial cell line to study TCTP's effect on Na,K-ATPase and calcium levels.
  • Generated and analyzed TCTP-transgenic mice to determine cataract incidence.
  • Compared cataract rates between TCTP-transgenic mice and control groups.

Main Results:

  • TCTP confirmed to induce intracellular calcium mobilization by inhibiting Na,K-ATPase in human lens cells.
  • TCTP-transgenic mice exhibited a significantly higher incidence of cataracts (7.38%) compared to controls (1.47%).
  • Demonstrated TCTP's role as a cataractogenic factor via Na,K-ATPase repression and calcium dysregulation in the lens.

Conclusions:

  • TCTP acts as a cataractogenic factor by repressing Na,K-ATPase activity in lens epithelial cells.
  • This repression leads to intracellular calcium mobilization and contributes to cataract development.
  • Findings highlight TCTP as a potential therapeutic target for preventing TCTP-associated cataracts.

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