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In Search of Mouse Models for Exfoliation Syndrome.

Rachel W Kuchtey1, Samuel Insignares2, Tzushan S Yang3

  • 1From the Vanderbilt Eye Institute, Department of Ophthalmology and Visual Sciences, Vanderbilt University Medical Center (R.W.K., S.I., J.K.), Nashville, Tennessee; Department of Molecular Physiology and Biophysics, Vanderbilt University (R.W.K.), Nashville, Tennessee.

American Journal of Ophthalmology
|June 23, 2024
PubMed
Summary
This summary is machine-generated.

A novel mouse model combining fibrillin-1 and lysyl oxidase like 1 defects reveals early signs of exfoliation syndrome (XFS) ocular dysfunction and systemic abnormalities. This research sheds light on XFS pathophysiology and its systemic links.

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Area of Science:

  • Ophthalmology
  • Genetics
  • Connective Tissue Diseases

Background:

  • Exfoliation syndrome (XFS) is a systemic connective tissue disorder with poorly understood mechanisms.
  • Key components of exfoliation material include fibrillin-1 and lysyl oxidase like 1 (LOXL1).

Purpose of the Study:

  • To investigate the combined effects of fibrillin-1 deficiency and LOXL1 absence in a mouse model to mimic XFS phenotypes.
  • To assess ocular and systemic manifestations in double mutant mice lacking functional Fbn1 and Loxl1.

Main Methods:

  • Double mutant (dbm) mice were generated by crossing Fbn1C1041G/+ and Loxl1-/- mice.
  • Ocular parameters (IOP, visual acuity, ERG, biometry, optic nerve area) and systemic phenotypes were evaluated at 16 weeks.
  • Statistical analysis included two-tailed Student t tests.

Main Results:

  • Double mutant mice exhibited reduced visual acuity, impaired retinal function, and enlarged optic nerve areas.
  • Biometric anomalies were exacerbated in double mutants compared to single mutants.
  • Severe systemic phenotypes, including organ prolapse and cardiovascular/pulmonary issues, were observed in double mutants.

Conclusions:

  • The findings support a functional overlap between fibrillin-1 and LOXL1 in exfoliation material.
  • Early retinal ganglion cell dysfunction is indicated by reduced retinal function and enlarged optic nerve area, despite normal IOP.
  • This mouse model offers insights into the systemic implications of XFS and its connection to human diseases.