NorLeu3A(1-7) accelerates clear corneal full thickness wound healing

Walid F. Abdallah, Stan G. Louie, Yi Zhang, Kathleen E. Rodgers, Emily Sivok, Gere S. Dizerega, Mark S. Humayun

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

PURPOSE. We evaluated the effect of the renin angiotensin system (RAS) peptide NorLeu3-Angiotensin (1-7) (NLE) formulated in a viscoelastic gel (USB004) on the healing of full-thickness corneal injuries. METHODS. Dutch pigmented rabbits received conjunctival administration of 0.3% USB004, 0.03% USB004, or vehicle-control to healthy and full-thickness injured eyes administered once daily for 28 consecutive days. Safety was evaluated using IOP measurement, slit-lamp examination, and confocal microscopy. Evaluations for both efficacy studies included an oblique light examination, modified Seidel test (Seidel test with gentle ocular pressure) as well as during elevated IOP test, confocal microscopy imaging, and histologic analysis. RESULTS. Application of 0.3% USB004, 0.03% USB004, and vehicle-control was safe in healthy and incised eyes. Further, application of 0.3% and 0.03% USB004 following full-thickness corneal incision resulted in a 2-fold acceleration of resolution of edema and inflammation, reduction in duration of wound leakage on a modified Seidel test (Seidel test with gentle ocular pressure) as well as during elevated IOP test, and healing with near normal architecture without evidence of fibrosis and angiogenesis when compared to vehicle-control animals. CONCLUSIONS. Topical ocular application of 0.3% and 0.03% USB004 promotes full-thickness cornea wound healing without the evidence of fibrosis and angiogenesis. Further studies are warranted to determine the cornea-specific mechanism of action(s) that promotes regeneration leading to clear corneal healing.

Original languageEnglish (US)
Pages (from-to)2187-2194
Number of pages8
JournalInvestigative Ophthalmology and Visual Science
Volume57
Issue number4
DOIs
StatePublished - Apr 1 2016
Externally publishedYes

Keywords

  • Corneal healing
  • Corneal incision
  • Corneal injury
  • Eye
  • NorLeuA(1-7)
  • Progenitor cells
  • Renin-angiotensin system

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience

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