Effect of gallium maltolate on a model of chronic, infected equine distal limb wounds

PLoS One. 2020 Jun 19;15(6):e0235006. doi: 10.1371/journal.pone.0235006. eCollection 2020.

Abstract

Distal limb wounds are common injuries sustained by horses and their healing is fraught with complications due to equine anatomy, prevalence of infection, and challenges associated with wound management. Gallium is a semi-metallic element that has been shown to possess antimicrobial properties and aid in wound healing in various preclinical models. The effects of Gallium have not been studied in equine wound healing. Therefore, the objective of this study was to compare healing rates between gallium-treated and untreated wounds of equine distal limbs and to demonstrate the antimicrobial effects of gallium on wounds inoculated with S. aureus. Using an established model of equine wound healing we demonstrated beneficial effects of 0.5% topical gallium maltolate on equine wound healing. Specifically we documented reduced healing times, reduced bioburden, and reduced formation of exuberant granulation tissue in wounds treated with gallium maltolate as compared with untreated wounds. Gallium appeared to exert its beneficial effects via its well-described antimicrobial actions as well as by altering the expression of specific genes known to be involved in wound healing of horses and other animals. Specifically, gallium maltolate appeared to increase expression of transforming growth factor-β in both infected and un-infected wounds. Further work is needed to document the effects of gallium on naturally occurring equine wounds and to compare the effects of gallium with other wound treatment options. These data, however, suggest that gallium may be an attractive and novel means of improving equine distal limb wound healing.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Administration, Topical
  • Animals
  • Anti-Bacterial Agents / administration & dosage
  • Anti-Bacterial Agents / therapeutic use*
  • Bacterial Load
  • Cytokines / genetics
  • Cytokines / metabolism
  • Horse Diseases / drug therapy*
  • Horse Diseases / metabolism
  • Horses
  • Leg Injuries / drug therapy*
  • Leg Injuries / metabolism
  • Leg Injuries / veterinary
  • Organometallic Compounds / administration & dosage
  • Organometallic Compounds / therapeutic use*
  • Pyrones / administration & dosage
  • Pyrones / therapeutic use*
  • Staphylococcal Infections / drug therapy*
  • Staphylococcal Infections / metabolism
  • Staphylococcal Infections / veterinary
  • Wound Healing

Substances

  • Anti-Bacterial Agents
  • Cytokines
  • Organometallic Compounds
  • Pyrones
  • gallium maltolate

Grants and funding

SPL, CMW, NDC: Research and Graduate Studies Trainee Grant, Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Texas A&M University. NDC: Link Equine Research Endowment, College of Veterinary Medicine, Texas A&M University