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Human antimicrobial peptides in ocular surface defense.

Imran Mohammed1, Dalia G Said1, Harminder S Dua1

  • 1Larry A. Donoso Laboratory for Eye Research, Academic Section of Ophthalmology, Division of Clinical Neuroscience, School of Medicine, University of Nottingham, Queens Medical Centre, Derby Road, Nottingham NG7 2UH, United Kingdom.

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Summary

The cornea uses antimicrobial peptides (AMPs) to fight infections. These AMPs offer a promising alternative to antibiotics, especially with rising drug resistance and limited access in developing nations.

Keywords:
Antimicrobial peptidesBacteriaConjunctivitisCorneal epitheliumEyeFungiHost defense peptidesKeratitisOcular surfaceProtozoaToll-like receptorsVirus

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Area of Science:

  • Ophthalmology
  • Immunology
  • Microbiology

Background:

  • The cornea's exposed surface makes it susceptible to microbial infections.
  • Endogenous antimicrobial peptides (AMPs) are crucial in the cornea's defense mechanisms.
  • AMPs are cationic peptides effective against various pathogens, including viruses, bacteria, fungi, and parasites.

Purpose of the Study:

  • To explore the role of AMPs in ocular defense.
  • To investigate mechanisms of AMP induction, including Toll-like receptor (TLR) pathways and non-TLR mediated pathways.
  • To highlight AMPs as potential alternatives to conventional antibiotics due to increasing antimicrobial resistance.

Main Methods:

  • Review of existing literature on corneal defense mechanisms and AMPs.
  • Identification of specific AMPs and their induction pathways (TLR-mediated and non-TLR mediated).
  • Analysis of non-microbicidal functions of AMPs, such as immunomodulation and wound healing.

Main Results:

  • AMPs are key components of the cornea's innate immunity against microbial infections.
  • Specific AMPs are induced via TLR activation by various ocular pathogens like *Mycobacterium tuberculosis*, herpes virus, and *Acanthamoeba*.
  • Non-TLR mediated induction involves molecules like vitamin D3 and sodium butyrate.

Conclusions:

  • AMPs exhibit broad-spectrum antimicrobial activity and possess non-microbicidal functions beneficial for corneal health.
  • AMPs represent a promising therapeutic strategy to combat ocular infections, potentially reducing reliance on antibiotics.
  • Further research into AMPs could lead to novel treatments for eye infections, addressing antibiotic resistance and accessibility issues.