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The Retina

The Retina

The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.

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Vibratome Sectioning Mouse Retina to Prepare Photoreceptor Cultures

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Published on: December 22, 2014

Retinoid processing in cone and Müller cell lines.

Yogita Kanan¹, Anne Kasus-Jacobi, Gennadiy Moiseyev

¹Department of Cell Biology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA.

Experimental Eye Research

|January 1, 2008

Summary

Cone and Müller cells in rod-dominated retinas were studied for their role in the retinoid cycle. Müller cells (rMC-1) can process retinoids but cannot regenerate 11-cis retinal, suggesting they don't contribute to this visual pigment regeneration.

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Last Updated: Jul 8, 2026

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Imaging Ca2+ Dynamics in Cone Photoreceptor Axon Terminals of the Mouse Retina

Imaging Ca²⁺ Dynamics in Cone Photoreceptor Axon Terminals of the Mouse Retina

Published on: May 6, 2015

Area of Science:

Ophthalmology
Cell Biology
Biochemistry

Background:

The visual cycle is crucial for photoreceptor function, involving the regeneration of 11-cis retinal.
Cone and Müller cells are present in rod-dominated retinas, but their specific roles in the visual cycle remain unclear.

Purpose of the Study:

To investigate the potential cooperation between cone (661W) and Müller (rMC-1) cell lines in regenerating the 11-cis retinal chromophore.
To determine if Müller cells contribute to the retinoid cycle by regenerating 11-cis retinoids.

Main Methods:

Retinoid cycle enzyme expression was analyzed using RT-PCR in 661W and rMC-1 cell lines.
Enzyme catalytic activity was assessed by incubating cells with retinoids and analyzing products via HPLC.

Main Results:

661W cells demonstrated the ability to reduce all-trans retinal to all-trans retinol and produce retinyl-esters.
rMC-1 cells absorbed all-trans retinol, oxidizing it to all-trans retinal or esterifying it, but lacked the ability to isomerize all-trans retinoids to 11-cis retinoids.

Conclusions:

Müller cells, as represented by the rMC-1 cell line, do not appear to regenerate 11-cis retinoids, suggesting they may not contribute to the visual cycle's regeneration of this chromophore.
The inability of rMC-1 cells to isomerize retinoids could be due to inherent limitations in Müller cells in vivo or a consequence of the cell line's transformed nature.