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Distinct Ultradian Rhythms in Plasma Clusterin Concentrations in Lean and Obese Korean Subjects
BACKGROUND: Blood levels of many hormones show rhythmic fluctuations with variable duration of cycles. Clusterin/apolipoprotein J is a glycoprotein which is highly expressed in the plasma and has modulatory roles in immune and inflammatory reactions, neurobiology, lipid metabolism, and leptin signal...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Korean Endocrine Society
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6021305/ https://www.ncbi.nlm.nih.gov/pubmed/29766682 http://dx.doi.org/10.3803/EnM.2018.33.2.245 |
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author | Choi, Jong Han Jeong, Eunheui Youn, Byung Soo Kim, Min-Seon |
author_facet | Choi, Jong Han Jeong, Eunheui Youn, Byung Soo Kim, Min-Seon |
author_sort | Choi, Jong Han |
collection | PubMed |
description | BACKGROUND: Blood levels of many hormones show rhythmic fluctuations with variable duration of cycles. Clusterin/apolipoprotein J is a glycoprotein which is highly expressed in the plasma and has modulatory roles in immune and inflammatory reactions, neurobiology, lipid metabolism, and leptin signaling. In this study, we examined the diurnal fluctuations of plasma clusterin concentrations in lean and obese young men. METHODS: For the study, 14 subjects (five lean and five obese men; two lean and two obese women) were admitted to the research ward and blood samples were drawn every 30 minutes during light-on period (6:00 AM to 10:00 PM) and every hour during light-off period. RESULTS: Notably, plasma clusterin concentrations displayed a unique ultradian rhythm with five cycles a day in both men and women. During the light-on period, circulating clusterin levels showed fluctuating curves with 4 hours regular intervals with sharp peaks and troughs. In contrast, single oscillation curve during light-off exhibited a smoothened/lower peak and longer (8-hour) duration. In obese men, these cycles were phase-advanced by approximately 1 hour, and had reduced amplitude of fluctuating curves and blunted diurnal pattern. Cyclic fluctuations of plasma clusterin were preserved under fasting and unexpected meal condition, suggesting that rhythmic oscillations in plasma clusterin levels are not generated by meal-related cues. CONCLUSION: These findings firstly demonstrate a novel pattern of plasma clusterin fluctuations with extremely regular cycles. |
format | Online Article Text |
id | pubmed-6021305 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Korean Endocrine Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-60213052018-06-29 Distinct Ultradian Rhythms in Plasma Clusterin Concentrations in Lean and Obese Korean Subjects Choi, Jong Han Jeong, Eunheui Youn, Byung Soo Kim, Min-Seon Endocrinol Metab (Seoul) Original Article BACKGROUND: Blood levels of many hormones show rhythmic fluctuations with variable duration of cycles. Clusterin/apolipoprotein J is a glycoprotein which is highly expressed in the plasma and has modulatory roles in immune and inflammatory reactions, neurobiology, lipid metabolism, and leptin signaling. In this study, we examined the diurnal fluctuations of plasma clusterin concentrations in lean and obese young men. METHODS: For the study, 14 subjects (five lean and five obese men; two lean and two obese women) were admitted to the research ward and blood samples were drawn every 30 minutes during light-on period (6:00 AM to 10:00 PM) and every hour during light-off period. RESULTS: Notably, plasma clusterin concentrations displayed a unique ultradian rhythm with five cycles a day in both men and women. During the light-on period, circulating clusterin levels showed fluctuating curves with 4 hours regular intervals with sharp peaks and troughs. In contrast, single oscillation curve during light-off exhibited a smoothened/lower peak and longer (8-hour) duration. In obese men, these cycles were phase-advanced by approximately 1 hour, and had reduced amplitude of fluctuating curves and blunted diurnal pattern. Cyclic fluctuations of plasma clusterin were preserved under fasting and unexpected meal condition, suggesting that rhythmic oscillations in plasma clusterin levels are not generated by meal-related cues. CONCLUSION: These findings firstly demonstrate a novel pattern of plasma clusterin fluctuations with extremely regular cycles. Korean Endocrine Society 2018-06 2018-05-04 /pmc/articles/PMC6021305/ /pubmed/29766682 http://dx.doi.org/10.3803/EnM.2018.33.2.245 Text en Copyright © 2018 Korean Endocrine Society http://creativecommons.org/licenses/by-nc/4.0/ 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 | Original Article Choi, Jong Han Jeong, Eunheui Youn, Byung Soo Kim, Min-Seon Distinct Ultradian Rhythms in Plasma Clusterin Concentrations in Lean and Obese Korean Subjects |
title | Distinct Ultradian Rhythms in Plasma Clusterin Concentrations in Lean and Obese Korean Subjects |
title_full | Distinct Ultradian Rhythms in Plasma Clusterin Concentrations in Lean and Obese Korean Subjects |
title_fullStr | Distinct Ultradian Rhythms in Plasma Clusterin Concentrations in Lean and Obese Korean Subjects |
title_full_unstemmed | Distinct Ultradian Rhythms in Plasma Clusterin Concentrations in Lean and Obese Korean Subjects |
title_short | Distinct Ultradian Rhythms in Plasma Clusterin Concentrations in Lean and Obese Korean Subjects |
title_sort | distinct ultradian rhythms in plasma clusterin concentrations in lean and obese korean subjects |
topic | Original Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6021305/ https://www.ncbi.nlm.nih.gov/pubmed/29766682 http://dx.doi.org/10.3803/EnM.2018.33.2.245 |
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