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Mast Cell-Derived Tryptase in Geographic Atrophy.

D Scott McLeod1, Imran Bhutto1, Malia M Edwards1

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|November 23, 2017
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Summary

Tryptase released from mast cells in geographic atrophy (GA) binds to Bruch's membrane, potentially degrading extracellular matrix and contributing to retinal disease progression. This finding offers insights into age-related macular degeneration.

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Area of Science:

  • Ophthalmology
  • Immunology
  • Cell Biology

Background:

  • Age-related macular degeneration (AMD) is a leading cause of vision loss.
  • Mast cells (MCs) and their mediators are implicated in AMD pathogenesis.
  • Previous studies showed increased degranulating MCs in AMD choroids.

Purpose of the Study:

  • To investigate the localization of tryptase, a key MC protease, in aged human eyes with and without geographic atrophy (GA).
  • To understand the role of tryptase in the context of GA, a late stage of AMD.

Main Methods:

  • Postmortem human eyes with and without GA were analyzed.
  • Immunohistochemistry was used to detect tryptase.
  • Confocal microscopy was employed for imaging.

Main Results:

  • In control eyes, tryptase was localized to choroidal MCs.
  • In GA eyes, tryptase was found in MCs and diffusely in the stroma, indicating degranulation.
  • Strong tryptase staining was observed within Bruch's membrane (BM) in GA eyes, preceding RPE atrophy.

Conclusions:

  • Tryptase released from degranulating choroidal MCs binds to BM in GA.
  • Tryptase may degrade BM components, impacting retinal pigment epithelium (RPE) and choroidal health.
  • These findings suggest a role for MC-derived tryptase in AMD progression.