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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.
Anatomy of the Eyeball01:20

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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,...
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Related Experiment Video

Updated: Jun 12, 2026

Immunostaining of Whole-Mount Retinas with the CLARITY Tissue Clearing Method
09:01

Immunostaining of Whole-Mount Retinas with the CLARITY Tissue Clearing Method

Published on: March 6, 2021

Retinal indoleamine accumulating neurons.

B Ehinger1, I Florén

  • 1Dept. of Ophthalmology, Univ. of Lund, S-221 85 Lund, Sweden.

Neurochemistry International
|May 22, 2010
PubMed
Summary
This summary is machine-generated.

New indoleamine-accumulating neurons were found in retinas of several species but not humans. Evidence suggests their neurotransmitter is an unidentified indole, not 5-hydroxytryptamine.

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Area of Science:

  • Neuroscience
  • Retinal Biology
  • Cellular Neuroscience

Background:

  • A novel class of neurons, identified by their indoleamine accumulation, has been discovered in the retinas of various species.
  • These neurons are a subset of amacrine cells and are distinct from other known amacrine cell types based on their transmitter.
  • Their presence is species-specific, being found in Cebus monkeys, rabbits, cats, pigeons, chickens, goldfish, and lampreys, but not in humans or certain other mammals.

Purpose of the Study:

  • To characterize a newly identified population of indoleamine-accumulating neurons in the retina.
  • To investigate the potential role of 5-hydroxytryptamine as a neurotransmitter in these retinal neurons.
  • To explore the uptake mechanisms and functional properties of indoleamines within these specific neuronal cells.

Main Methods:

  • Electron microscopy was used to examine the ultrastructure and synaptic connections of the indoleamine-accumulating neurons.
  • Selective procedures were employed to target and eliminate the processes of these neurons.
  • Biochemical assays were performed to assess 5-hydroxytryptamine levels, enzyme activity (tryptophan hydroxylase), and cyclic AMP responses in the retina.
  • Pharmacological studies investigated the uptake of indoleamines and the effects of various inhibitors.

Main Results:

  • Indoleamine-accumulating neurons form dyadic and reciprocal synaptic contacts with bipolar cells.
  • These neurons do not exhibit formaldehyde-induced fluorescence, and retinal 5-hydroxytryptamine levels are too low to suggest it as a neurotransmitter.
  • The rate-limiting enzyme for 5-hydroxytryptamine synthesis, tryptophan hydroxylase, was undetectable in the retina.
  • While an energy-dependent, high-affinity indoleamine uptake system exists, its inhibition patterns differ from those in brain tissue, disfavouring 5-hydroxytryptamine as a neurotransmitter.
  • The active uptake of indoleamines suggests an unidentified indole compound is likely the transmitter.

Conclusions:

  • The identified neurons are a distinct subset of retinal amacrine cells specialized for indoleamine accumulation.
  • Evidence strongly refutes 5-hydroxytryptamine as the neurotransmitter for these neurons.
  • The findings indicate that the neurotransmitter is an unidentified indole compound, highlighting a new area for retinal neurotransmitter research.