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Endotoxin-induced inflammation disturbs melatonin secretion in ewe
OBJECTIVE: The study examined the effect of intravenous administration of bacterial endotoxin—lipopolysaccharide (LPS) —on the nocturnal secretion of melatonin and on the expression of enzymes of the melatonin biosynthetic pathway in the pineal gland of ewes, taking into account two different photop...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Asian-Australasian Association of Animal Production Societies (AAAP) and Korean Society of Animal Science and Technology (KSAST)
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5666183/ https://www.ncbi.nlm.nih.gov/pubmed/28728370 http://dx.doi.org/10.5713/ajas.17.0196 |
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author | Herman, Andrzej Przemysław Wojtulewicz, Karolina Bochenek, Joanna Krawczyńska, Agata Antushevich, Hanna Pawlina, Bartosz Zielińska-Górska, Marlena Herman, Anna Romanowicz, Katarzyna Tomaszewska-Zaremba, Dorota |
author_facet | Herman, Andrzej Przemysław Wojtulewicz, Karolina Bochenek, Joanna Krawczyńska, Agata Antushevich, Hanna Pawlina, Bartosz Zielińska-Górska, Marlena Herman, Anna Romanowicz, Katarzyna Tomaszewska-Zaremba, Dorota |
author_sort | Herman, Andrzej Przemysław |
collection | PubMed |
description | OBJECTIVE: The study examined the effect of intravenous administration of bacterial endotoxin—lipopolysaccharide (LPS) —on the nocturnal secretion of melatonin and on the expression of enzymes of the melatonin biosynthetic pathway in the pineal gland of ewes, taking into account two different photoperiodic conditions: short-night (SN; n = 12) and long-night (LN; n = 12). METHODS: In both experiments, animals (n = 12) were randomly divided into two groups: control (n = 6) and LPS-treated (n = 6) one. Two hours after sunset, animals received an injection of LPS or saline. Blood samples were collected starting one hour after sunset and continuing for 3 hours after the treatment. The ewes were euthanized 3 hours after LPS/saline treatment. The concentration of hormones in plasma was assayed by radioimmunoassay. In the pineal gland, the content of serotonin and its metabolite was determined by HPLC; whereas the expression of examined genes and protein was assayed using real-time polymerase chain reaction and Western Blot, respectively. RESULTS: Endotoxin administration lowered (p<0.05) levels of circulating melatonin in animals from LN photoperiod only during the first hour after treatment, while in ewes from SN photoperiod only in the third hour after the injection. Inflammation more substantially suppressed biosynthesis of melatonin in ewes from SN photoperiod, which were also characterised by lower (p<0.05) cortisol concentrations after LPS treatment compared with animals from LN photoperiod. In the pineal gland of ewes subjected to SN photoperiod, LPS reduced (p<0.05) serotonin content and the expression of melatonin biosynthetic pathway enzymes, such as tryptophan hydroxylase and arylalkylamine-N-acetyltransferase. Pineal activity may be disturbed by circulating LPS and proinflammatory cytokines because the expression of mRNAs encoding their corresponding receptors was determined in this gland. CONCLUSION: The present study showed that peripheral inflammation reduces the secretion of melatonin, but this effect may be influenced by the photoperiod. |
format | Online Article Text |
id | pubmed-5666183 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Asian-Australasian Association of Animal Production Societies (AAAP) and Korean Society of Animal Science and Technology (KSAST) |
record_format | MEDLINE/PubMed |
spelling | pubmed-56661832017-12-01 Endotoxin-induced inflammation disturbs melatonin secretion in ewe Herman, Andrzej Przemysław Wojtulewicz, Karolina Bochenek, Joanna Krawczyńska, Agata Antushevich, Hanna Pawlina, Bartosz Zielińska-Górska, Marlena Herman, Anna Romanowicz, Katarzyna Tomaszewska-Zaremba, Dorota Asian-Australas J Anim Sci Article OBJECTIVE: The study examined the effect of intravenous administration of bacterial endotoxin—lipopolysaccharide (LPS) —on the nocturnal secretion of melatonin and on the expression of enzymes of the melatonin biosynthetic pathway in the pineal gland of ewes, taking into account two different photoperiodic conditions: short-night (SN; n = 12) and long-night (LN; n = 12). METHODS: In both experiments, animals (n = 12) were randomly divided into two groups: control (n = 6) and LPS-treated (n = 6) one. Two hours after sunset, animals received an injection of LPS or saline. Blood samples were collected starting one hour after sunset and continuing for 3 hours after the treatment. The ewes were euthanized 3 hours after LPS/saline treatment. The concentration of hormones in plasma was assayed by radioimmunoassay. In the pineal gland, the content of serotonin and its metabolite was determined by HPLC; whereas the expression of examined genes and protein was assayed using real-time polymerase chain reaction and Western Blot, respectively. RESULTS: Endotoxin administration lowered (p<0.05) levels of circulating melatonin in animals from LN photoperiod only during the first hour after treatment, while in ewes from SN photoperiod only in the third hour after the injection. Inflammation more substantially suppressed biosynthesis of melatonin in ewes from SN photoperiod, which were also characterised by lower (p<0.05) cortisol concentrations after LPS treatment compared with animals from LN photoperiod. In the pineal gland of ewes subjected to SN photoperiod, LPS reduced (p<0.05) serotonin content and the expression of melatonin biosynthetic pathway enzymes, such as tryptophan hydroxylase and arylalkylamine-N-acetyltransferase. Pineal activity may be disturbed by circulating LPS and proinflammatory cytokines because the expression of mRNAs encoding their corresponding receptors was determined in this gland. CONCLUSION: The present study showed that peripheral inflammation reduces the secretion of melatonin, but this effect may be influenced by the photoperiod. Asian-Australasian Association of Animal Production Societies (AAAP) and Korean Society of Animal Science and Technology (KSAST) 2017-12 2017-06-27 /pmc/articles/PMC5666183/ /pubmed/28728370 http://dx.doi.org/10.5713/ajas.17.0196 Text en Copyright © 2017 by Asian-Australasian Journal of Animal Sciences This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Article Herman, Andrzej Przemysław Wojtulewicz, Karolina Bochenek, Joanna Krawczyńska, Agata Antushevich, Hanna Pawlina, Bartosz Zielińska-Górska, Marlena Herman, Anna Romanowicz, Katarzyna Tomaszewska-Zaremba, Dorota Endotoxin-induced inflammation disturbs melatonin secretion in ewe |
title | Endotoxin-induced inflammation disturbs melatonin secretion in ewe |
title_full | Endotoxin-induced inflammation disturbs melatonin secretion in ewe |
title_fullStr | Endotoxin-induced inflammation disturbs melatonin secretion in ewe |
title_full_unstemmed | Endotoxin-induced inflammation disturbs melatonin secretion in ewe |
title_short | Endotoxin-induced inflammation disturbs melatonin secretion in ewe |
title_sort | endotoxin-induced inflammation disturbs melatonin secretion in ewe |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5666183/ https://www.ncbi.nlm.nih.gov/pubmed/28728370 http://dx.doi.org/10.5713/ajas.17.0196 |
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