Association between Moraxella keratitis and advanced glycation end products

Area of Science:

• Ophthalmology
• Microbiology
• Endocrinology

Background:

• Diabetes mellitus is a known risk factor for Moraxella keratitis.
• The precise mechanisms linking diabetes to Moraxella keratitis are not fully understood.
• Advanced glycation end products (AGEs) accumulate in diabetic tissues.

Purpose of the Study:

• To investigate the impact of advanced glycation end products (AGEs) deposition in the cornea on Moraxella bacterial adhesion.
• To explore the role of AGEs in the pathogenesis of Moraxella keratitis in diabetic patients.

Main Methods:

• Retrospective analysis of 27 culture-proven Moraxella keratitis cases.
• Identification of Moraxella isolates using MALDI-TOF mass spectrometry.
• In vitro assessment of Moraxella nonliquefaciens adherence to human corneal epithelial cells (HCECs) with and without AGEs.
• In vivo study using streptozotocin-induced diabetic mice treated with an AGE inhibitor.

Main Results:

• 30.4% of patients with Moraxella keratitis had diabetes mellitus.
• Moraxella nonliquefaciens adherence to HCECs significantly increased with AGEs.
• Pyridoxamine treatment significantly reduced Moraxella nonliquefaciens adherence in diabetic mouse corneas.

Conclusions:

• AGEs deposition in the corneal epithelium may significantly influence the development of Moraxella keratitis.
• Targeting AGEs could be a potential therapeutic strategy for Moraxella keratitis in diabetic individuals.