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Application of Optical Coherence Tomography to a Mouse Model of Retinopathy

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The outer limiting membrane (OLM) revisited: clinical implications.

S Omri¹, B Omri, M Savoldelli

¹INSERM, U872 Physiopathology of ocular diseases: Therapeutic innovations, Paris, France.

Clinical Ophthalmology (Auckland, N.Z.)

|May 14, 2010

Summary

This summary is machine-generated.

The outer limiting membrane (OLM) contains junction proteins, suggesting it acts as a retinal barrier. This barrier may be compromised in diabetes, potentially causing macular fluid accumulation.

Keywords:

OLM adherent diabetes junctions retinal barrier tight

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Area of Science:

Ophthalmology
Retinal Biology
Cell Biology

Background:

The outer limiting membrane (OLM) was traditionally viewed for mechanical support.
Emerging evidence suggests the OLM's role in retinal barrier function.

Purpose of the Study:

To investigate the presence and role of junction proteins at the OLM.
To determine if the OLM functions as a component of the retinal barrier.

Main Methods:

Analysis of junction proteins in rat, monkey, and human retinas using immunohistochemistry and western blotting.
Proteomic analysis of microdissected OLM regions.
Ultrastructural examination of retinal tissues.

Main Results:

The OLM contains junction proteins like occludin, JAM, and ZO-1 in rats and monkeys.
Occludin expression is reduced in diabetic rat retinas, with glial junction dissociation.
Ultrastructural data suggests tight junctions between Müller cells and photoreceptors.

Conclusions:

The OLM possesses heterotypic junctions with adherent and tight junction proteins, indicating a potential barrier function.
Occludin in the OLM is reduced in diabetes, implicating OLM dysfunction in macular edema.
The OLM should be recognized as a critical part of the retinal barrier.