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Fibrillin-rich microfibrils: structural modifications during ageing in normal human zonule

E Hanssen1, S Franc, R Garrone

  • 1Institute of Biology and Chemistry of Proteins, CNRS UPR 412, Lyon, France. biocell@ibcp.fr

Journal of Submicroscopic Cytology and Pathology
|September 2, 1998
PubMed
Summary

Ageing affects elastic fibers in the eye's ciliary zonule, leading to fragility. Structural changes in microfibrils, containing fibrillin, are observed in older individuals, impacting ocular health.

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Area of Science:

  • Biomedical Science
  • Ophthalmology
  • Cell Biology

Background:

  • Ageing causes tissue changes, including loss of elastic fiber elasticity.
  • Fibrillin-rich microfibrils are key components of elastic fibers and ciliary zonule.
  • Genetic mutations in fibrillin cause Marfan syndrome, affecting cardiovascular, skeletal, and ocular systems.

Purpose of the Study:

  • To investigate structural modifications in fibrillin-rich microfibrils during human ciliary zonule ageing.
  • To understand the relationship between ageing, microfibril structure, and ocular pathology risk.

Main Methods:

  • Light microscopy
  • Transmission electron microscopy with rotary shadowing
  • Analysis of human ciliary zonule samples from different age groups.

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Main Results:

  • Qualitative differences observed between young and old ciliary zonules.
  • Structural modifications in microfibrils are identified as a likely cause of zonule fibre changes.
  • Detailed description of zonule fiber organization and ciliary body insertion.

Conclusions:

  • Ageing significantly alters the structure of microfibrils within the ciliary zonule.
  • These microfibril modifications contribute to the increased fragility of zonule fibers with age.
  • Understanding these changes is crucial for addressing age-related ocular pathologies.