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Updated: Aug 7, 2026

Detection of Small GTPase Prenylation and GTP Binding Using Membrane Fractionation and GTPase-linked Immunosorbent Assay
13:51

Detection of Small GTPase Prenylation and GTP Binding Using Membrane Fractionation and GTPase-linked Immunosorbent Assay

Published on: November 11, 2018

Lovastatin-induced cytoskeletal reorganization in lens epithelial cells: role of Rho GTPases

R L Maddala1, V N Reddy, P V Rao

  • 1Department of Ophthalmology, Duke University Medical Center, Durham, North Carolina, USA.

Investigative Ophthalmology & Visual Science
|October 3, 2001
PubMed
Abstract

Insights

Lovastatin disrupts lens cell structure by inhibiting protein prenylation, affecting Rho and Rac GTPase function. Geranylgeranyl pyrophosphate supplementation reversed these cataract-like changes, highlighting its therapeutic potential.

Area of Science:

  • Cell Biology
  • Biochemistry
  • Ophthalmology

Background:

  • Lovastatin, a statin drug, inhibits HMG-CoA reductase, impacting isoprenoid synthesis.
  • Isoprenylation is crucial for small GTPase function, influencing cell adhesion and cytoskeleton.
  • Cataractogenesis involves cellular changes in the lens, potentially linked to cytoskeletal disruption.

Purpose of the Study:

  • To investigate the role of isoprenylated small GTPases (Rho, Rac) in lovastatin-induced cataractogenesis.
  • To analyze lovastatin's effects on cell adhesion and actin cytoskeleton organization in lens epithelial cells.

Main Methods:

  • Human and porcine lens epithelial cells were treated with lovastatin.
  • Immunocytochemistry assessed F-actin, focal adhesions (paxillin/vinculin), cell-cell adhesions (cadherin/beta-catenin), and protein tyrosine phosphorylation.
  • Western blot analyzed Rho/Rac GTPase distribution; C3-exoenzyme evaluated Rho GTPase involvement.

Main Results:

  • Lovastatin induced significant cell shape changes, loss of actin stress fibers, focal adhesions, and cell-cell adhesions.
  • Non-isoprenylated Rho and Rac GTPases accumulated in the cytosol.
  • Geranylgeranyl pyrophosphate reversed lovastatin's effects, while farnesyl pyrophosphate did not; C3-exoenzyme blocked recovery.

Conclusions:

  • Lovastatin disrupts lens epithelial cell actin cytoskeleton and adhesion through protein prenylation inhibition.
  • Impaired geranylgeranylated Rho and Rac GTPase function is the likely cause of lovastatin-induced cytoskeletal changes.
  • Findings suggest a mechanism for lovastatin-induced cataractogenesis related to geranylgeranylated GTPase dysfunction.

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