✦ LIBER ✦

Possible neurotransmitter role of noradrenaline in the teleost retina

✍ Scribed by Dr. E. H. Jaffe; M. Urbina; B. D. Drujan

Publisher: John Wiley and Sons
Year: 1991
Tongue: English
Weight: 535 KB
Volume: 29
Category: Article
ISSN: 0360-4012
DOI: 10.1002/jnr.490290208

No coin nor oath required. For personal study only.

✦ Synopsis

The role of dopamine as a neurotransmitter in the retina of different species has been clearly established; however, there is still some controversy as to whether noradrenaline (NA) is present as a neurotransmitter in this tissue. In this study, we show that, under controlled conditions, NA is present in the retina of goldfish at a concentration of 0.15 +/- 0.03 ng/mg protein and its biosynthetic enzyme, dopamine beta-hydroxylase shows an activity of 2.5 +/- 0.2 pmol NA/hr/mg protein. The amount of NA increases to 1.88 +/- 0.24 ng/mg protein in light adapted animals and decreases to undetectable levels in dark adapted ones. By contrast, dopamine-beta-hydroxylase levels are not affected by changes in light conditions. This finding provides further evidence in favor of a neurotransmitter role for NA in vertebrate retina.

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