Circadian rhythms of melatonin and serotonin- N-acetyltransferase activity in Procambarus clarkii

Invertebrates have circadian rhythms and exhibit photoperiodism and colour changes. While they lack pineal glands, those that have been investigated contain melatonin. Until now, melatonin has been shown to be present in the photoreceptor organs of this species, but the presence of the rate-limiting...

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Published in:Comparative biochemistry and physiology. A, Comparative physiology Vol. 112; no. 1; pp. 179 - 185
Main Authors: Agapito, M.T., Herrero, B., Pablos, M.I., Miguel, J.L., Recio, J.M.
Format: Journal Article
Language:English
Published: Elsevier B.V 1995
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Abstract Invertebrates have circadian rhythms and exhibit photoperiodism and colour changes. While they lack pineal glands, those that have been investigated contain melatonin. Until now, melatonin has been shown to be present in the photoreceptor organs of this species, but the presence of the rate-limiting enzyme in melatonin synthesis, serotonin- N-acetyltransferase (SNAT, EC 2.3.1.87) has not been investigated. We report here the presence of melatonin and the enzyme SNAT in the eyes (globe plus eyestalk) of the freshwater crayfish Procambarus clarkii. Both melatonin and SNAT activity exhibit circadian variations, with their acrophase during the light phase and their nadir during darkness. These rhythms have the same period, but they are 180° out of phase with respect to those described in vertebrates. SNAT is seemingly different to that reported in vertebrates since EGTA, a calcium chelator, has no protective function as it does in vertebrates.
AbstractList Invertebrates have circadian rhythms and exhibit photoperiodism and colour changes. While they lack pineal glands, those that have been investigated contain melatonin. Until now, melatonin has been shown to be present in the photoreceptor organs of this species, but the presence of the rate-limiting enzyme in melatonin synthesis, serotonin- N-acetyltransferase (SNAT, EC 2.3.1.87) has not been investigated. We report here the presence of melatonin and the enzyme SNAT in the eyes (globe plus eyestalk) of the freshwater crayfish Procambarus clarkii. Both melatonin and SNAT activity exhibit circadian variations, with their acrophase during the light phase and their nadir during darkness. These rhythms have the same period, but they are 180° out of phase with respect to those described in vertebrates. SNAT is seemingly different to that reported in vertebrates since EGTA, a calcium chelator, has no protective function as it does in vertebrates.
Invertebrates have circadian rhythms and exhibit photoperiodism and colour changes. While they lack pineal glands, those that have been investigated contain melatonin. Until now, melatonin has been shown to be present in the photoreceptor organs of this species, but the presence of the rate-limiting enzyme in melatonin synthesis, serotonin-N-acetyltransferase (SNAT, EC 2.3.1.87) has not been investigated. We report here the presence of melatonin and the enzyme SNAT in the eyes (globe plus eyestalk) of the freshwater crayfish Procambarus clarkii. Both melatonin and SNAT activity exhibit circadian variations, with their acrophase during the light phase and their nadir during darkness. These rhythms have the same period, but they are 180 degree out of phase with respect to those described in vertebrates. SNAT is seemingly different to that reported in vertebrates since EGTA, a calcium chelator, has no protective function as it doses in vertebrates.
Author Miguel, J.L.
Pablos, M.I.
Recio, J.M.
Herrero, B.
Agapito, M.T.
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  surname: Recio
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Issue 1
Keywords Circadian rhythms
Melatonin
Haemolymph
SNAT
Eyestalk
Photoreceptors
Procambarus clarkii
Crayfish
Endocrinology invertebrates
Photoperiodism
Language English
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Snippet Invertebrates have circadian rhythms and exhibit photoperiodism and colour changes. While they lack pineal glands, those that have been investigated contain...
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elsevier
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StartPage 179
SubjectTerms Circadian rhythms
Crayfish
Endocrinology invertebrates
Eyestalk
Freshwater
Haemolymph
Melatonin
Photoperiodism
Photoreceptors
Procambarus clarkii
SNAT
Title Circadian rhythms of melatonin and serotonin- N-acetyltransferase activity in Procambarus clarkii
URI https://dx.doi.org/10.1016/0300-9629(95)00071-E
https://search.proquest.com/docview/16888542
Volume 112
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