Related Experiment Video

Updated: Aug 8, 2026

Single-cell Suction Recordings from Mouse Cone Photoreceptors
14:35

Single-cell Suction Recordings from Mouse Cone Photoreceptors

Published on: January 6, 2010

Rod and cone specific domains in the interphotoreceptor matrix

K E Mieziewska1, T van Veen, J M Murray

  • 1Section of Medical Genetics, School of Veterinary Medicine, University of Pennsylvania, Philadelphia 19104.

The Journal of Comparative Neurology
|June 15, 1991
PubMed

Insights

The study characterized the insoluble matrix of the interphotoreceptor matrix (IPM) in dog, cat, and mouse retinas. Two distinct photoreceptor matrix domains, rod- and cone-associated, were identified using lectin cytochemistry.

Area of Science:

  • Ophthalmology
  • Cell Biology
  • Biochemistry

Background:

  • The interphotoreceptor matrix (IPM) is a complex extracellular matrix surrounding photoreceptor cells in the retina.
  • Understanding the structural organization of the IPM is crucial for comprehending photoreceptor function and retinal health.

Purpose of the Study:

  • To characterize the insoluble matrix domains of the IPM in mammalian retinas.
  • To investigate the differential binding patterns of WGA and PNA lectins within these domains.

Main Methods:

  • Lectin cytochemistry was employed on cryosections of dog, cat, and mouse retinal tissue.
  • Extracted insoluble matrix was analyzed using epifluorescence and scanning confocal laser microscopy.
  • Wheat germ agglutinin (WGA) and peanut agglutinin (PNA) lectins were used for labeling.

Main Results:

  • The insoluble IPM was extracted as a continuous sheet composed of two distinct photoreceptor-specific matrix domains.
  • Rod-associated domains formed a hexagonal lattice, interrupted by larger cone-associated domains (8-10 rod domains per cone domain).
  • PNA primarily labeled cone-associated matrix, while WGA labeled both rod- and cone-associated matrix.

Conclusions:

  • The insoluble IPM exhibits a structured organization with distinct rod- and cone-associated domains.
  • Differential lectin binding (WGA, PNA) highlights domain-specific composition and organization within the IPM.
  • This structural characterization provides insights into the specialized microenvironment of photoreceptor cells.

More Related Videos

Transretinal ERG Recordings from Mouse Retina: Rod and Cone Photoresponses08:38

Transretinal ERG Recordings from Mouse Retina: Rod and Cone Photoresponses

Published on: March 14, 2012

Two Peeling Methods for the Isolation of Photoreceptor Cell Compartments in the Mouse Retina for Protein Analysis11:08

Two Peeling Methods for the Isolation of Photoreceptor Cell Compartments in the Mouse Retina for Protein Analysis

Published on: December 7, 2021

Related Concept Videos

The Retina01:32

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.
Vision01:24

Vision

Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
Channel Rhodopsins01:11

Channel Rhodopsins

Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
G-Protein Gated Ion Channels01:21

G-Protein Gated Ion Channels

GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory organs,...
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...