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Retinal regions shape human and murine Müller cell proteome profile and functionality.
Lew Kaplan1, Corinne Drexler2,3, Anna M Pfaller1
1Department of Physiological Genomics, Ludwig-Maximilians-Universität München, Munich, Germany.
Glia
|November 5, 2022
Summary
Müller cells in the human macula, rich in cones, show unique adaptations. Researchers found epiplakin (EPPK1) is key for macular Müller cell structure and function under mechanical stress.
Area of Science:
- Ophthalmology
- Cell Biology
- Neuroscience
Background:
- The human macula is a specialized retinal region abundant in cone photoreceptors.
- The adaptation of Müller cells, the primary glial cells, to this unique environment remains unclear.
Purpose of the Study:
- To investigate how Müller cells adapt to the cone-rich environment of the human macula.
- To identify molecular players involved in Müller cell structure and function in different retinal regions.
Main Methods:
- Comparative proteomic analysis of human and mouse cone-rich (macula) and rod-rich retinae.
- Investigated the role of epiplakin (EPPK1) using a human Müller cell-derived cell line with EPPK1 knockout.
Main Results:
- Identified distinct proteomic profiles for Müller cells in cone- vs. rod-rich retinae, highlighting extracellular matrix and cell adhesion pathways.
- Epiplakin (EPPK1) was significantly upregulated in macular Müller cells.
- EPPK1 knockout reduced traction forces and altered cell morphology, including cell size, shape, and filopodia.
Conclusions:
- Epiplakin (EPPK1) is a crucial molecular component enabling region-specific architecture in the human retina.
- EPPK1 likely supports Müller cell function under substantial in vivo mechanical loads within the macula.
