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Experimental interstitial keratitis induced by Onchocerca volvulus antigens.

M Y Gallin1, D Murray, J H Lass

  • 1Department of Medicine, Case Western Reserve University School of Medicine, Cleveland, OH 44106.

Archives of Ophthalmology (Chicago, Ill. : 1960)
|October 1, 1988
PubMed
Summary

Researchers created a guinea pig model for onchocercal sclerosing keratitis. This model helps identify specific Onchocerca volvulus antigens causing corneal inflammation and scarring, aiding in understanding disease mechanisms.

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Area of Science:

  • Ophthalmology
  • Immunology
  • Parasitology

Background:

  • Onchocercal sclerosing keratitis is a significant cause of blindness.
  • The precise pathogenic mechanisms and causative antigens remain incompletely understood.

Purpose of the Study:

  • To develop an animal model for onchocercal sclerosing keratitis.
  • To identify specific Onchocerca volvulus antigens involved in inducing corneal inflammation.

Main Methods:

  • Developed an onchocercal interstitial keratitis model in guinea pigs.
  • Intrastromal injection of Onchocerca volvulus antigens into guinea pig corneas.
  • Separation of antigens by molecular sieve chromatography.

Main Results:

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  • Intrastromal antigen injection induced stromal keratitis, edema, neovascularization, and inflammation.
  • Repeated injections led to exacerbation and residual corneal scarring.
  • Intermediate molecular weight fractions showed the highest antigenic activity.

    • Conclusions:

    • The guinea pig model accurately replicates human onchocercal sclerosing keratitis.
    • Specific Onchocerca volvulus antigens, particularly those of intermediate molecular weight, are key drivers of the disease.
    • This model facilitates further research into immune mechanisms and antigen identification.