Cyclodextrin Enhances Corneal Tolerability and Reduces Ocular Toxicity Caused by Diclofenac

Oxid Med Cell Longev. 2018 Feb 13:2018:5260976. doi: 10.1155/2018/5260976. eCollection 2018.

Abstract

With advances in refractive surgery and demand for cataract removal and lens replacement, the ocular use of nonsteroidal anti-inflammatory drugs (NSAIDs) has increased. One of the most commonly used NSAIDs is diclofenac (Diclo). In this study, cyclodextrins (CDs), α-, β-, γ-, and HP-β-CDs, were investigated with in vitro irritation and in vivo ulceration models in rabbits to reduce Diclo toxicity. Diclo-, α-, β-, γ-, and HP-β-CD inclusion complexes were prepared and characterized and Diclo-CD complexes were evaluated for corneal permeation, red blood cell (RBCs) haemolysis, corneal opacity/permeability, and toxicity. Guest- (Diclo-) host (CD) solid inclusion complexes were formed only with β-, γ-, and HP-β-CDs. Amphipathic properties for Diclo were recorded and this surfactant-like functionality might contribute to the unwanted effects of Diclo on the surface of the eye. Contact angle and spreading coefficients were used to assess Diclo-CDs in solution. Reduction of ocular toxicity 3-fold to16-fold and comparable corneal permeability to free Diclo were recorded only with Diclo-γ-CD and Diclo-HP-β-CD complexes. These two complexes showed faster healing rates without scar formation compared with exposure to the Diclo solution and to untreated groups. This study also highlighted that Diclo-γ-CD and Diclo-HP-β-CD demonstrated fast healing without scar formation.

MeSH terms

  • Animals
  • Calorimetry, Differential Scanning
  • Cattle
  • Cell Death / drug effects
  • Cell Survival / drug effects
  • Cornea / drug effects
  • Cornea / pathology
  • Cornea / physiopathology*
  • Corneal Opacity / drug therapy
  • Corneal Opacity / pathology
  • Corneal Opacity / physiopathology
  • Cyclodextrins / chemistry
  • Cyclodextrins / pharmacology*
  • Cyclodextrins / therapeutic use
  • Diclofenac / adverse effects*
  • Diclofenac / chemistry
  • Erythrocytes / drug effects
  • Erythrocytes / metabolism
  • Hemolysis / drug effects
  • Humans
  • Molecular Docking Simulation
  • Permeability
  • Rabbits
  • Spectroscopy, Fourier Transform Infrared
  • Surface Tension
  • Ulcer / drug therapy
  • Ulcer / pathology
  • Ulcer / physiopathology

Substances

  • Cyclodextrins
  • Diclofenac