Chronic mercury at low doses impairs white adipose tissue plasticity
[Introduction]: The toxic effects of mercury (Hg) are involved in homeostasis of energy systems such as lipid and glucose metabolism, and white adipose tissue dysfunction is considered as a central mechanism leading to metabolic disorders. Objective: The aim of this study was to determine the effects of chronic inorganic Hg exposure at low doses on the lipid and glycemic metabolism.
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| Format: | artículo biblioteca |
| Language: | English |
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Elsevier
2019
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| Subjects: | Mercury, Endoplasmic reticulum stress, Lipid and glucose metabolism, White adipose tissue, |
| Online Access: | http://hdl.handle.net/10261/219814 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100004837 http://dx.doi.org/10.13039/501100003593 http://dx.doi.org/10.13039/501100003339 |
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dig-cial-es-10261-2198142022-09-16T07:07:31Z Chronic mercury at low doses impairs white adipose tissue plasticity Rizzetti, Danize Aparecida Corrales, Patricia Trindade Piagette, Janaina Uranga-Ocio, José Antonio Medina-Gómez, Gema Peçanha, Franck Maciel Vassallo, Dalton Valentim Miguel, Marta Wiggers, Giulia Alessandra Ministerio de Economía y Competitividad (España) Ministerio de Ciencia e Innovación (España) Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil) Consejo Superior de Investigaciones Científicas (España) Mercury Endoplasmic reticulum stress Lipid and glucose metabolism White adipose tissue [Introduction]: The toxic effects of mercury (Hg) are involved in homeostasis of energy systems such as lipid and glucose metabolism, and white adipose tissue dysfunction is considered as a central mechanism leading to metabolic disorders. Objective: The aim of this study was to determine the effects of chronic inorganic Hg exposure at low doses on the lipid and glycemic metabolism. [Methods]: Male Wistar rats were divided into two groups and treated for 60 days with: saline solution, i.m. (Untreated) and mercury chloride, i.m. - 1st dose 4.6 μg/kg, subsequent doses 0.07 μg/kg/day - (Mercury). Histological analyses, Hg levels measurement and GRP78, CHOP, PPARα, PPARγ, leptin, adiponectin and CD11 mRNA expressions were performed in epididymal white adipose tissue (eWAT). Glucose, triglycerides, total cholesterol and insulin plasma levels were also measured. [Results]: Hg exposure reduced the absolute and relative eWAT weights, adipocyte size, plasma insulin levels, glucose tolerance, antioxidant defenses and increased plasma glucose and triglyceride levels. In addition, CHOP, GRP78, PPARα, PPARγ, leptin and adiponectin mRNA expressions were increased in Hg-treated animals. No differences in Hg concentration were found in eWAT between the untreated and Hg groups. These results suggest that the reduction in adipocyte size is related to the impaired antioxidant defenses, endoplasmic reticulum (ER) stress, the disrupted PPARs and adipokines mRNA expression induced by the metal in eWAT. These disturbances possibly induced a decrease in circulating insulin levels, an imbalance between lipolysis and lipogenesis mechanisms in eWAT, with an increase in fatty acids mobilization, a reduction in glucose uptake and an activation of pro-apoptotic pathways, leading to hyperglycemia and hyperlipidemia. [Conclusions]: Hg is a powerful environmental WAT disruptor that influences signaling events and impairs metabolic activity and hormonal balance of adipocytes. This work was supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico – CNPq [203440/2014-5] and the Ministerio de Economía y Competitividad – MINECO [AGL2012-32387 and CSIC – Intramural 201570I028]. Peer reviewed 2020-09-18T06:39:32Z 2020-09-18T06:39:32Z 2019 artículo http://purl.org/coar/resource_type/c_6501 Toxicology 418: 41-50 (2019) 0300-483X http://hdl.handle.net/10261/219814 10.1016/j.tox.2019.02.013 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100004837 http://dx.doi.org/10.13039/501100003593 http://dx.doi.org/10.13039/501100003339 en https://doi.org/10.1016/j.tox.2019.02.013 Sí none Elsevier |
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Mercury Endoplasmic reticulum stress Lipid and glucose metabolism White adipose tissue Mercury Endoplasmic reticulum stress Lipid and glucose metabolism White adipose tissue |
| spellingShingle |
Mercury Endoplasmic reticulum stress Lipid and glucose metabolism White adipose tissue Mercury Endoplasmic reticulum stress Lipid and glucose metabolism White adipose tissue Rizzetti, Danize Aparecida Corrales, Patricia Trindade Piagette, Janaina Uranga-Ocio, José Antonio Medina-Gómez, Gema Peçanha, Franck Maciel Vassallo, Dalton Valentim Miguel, Marta Wiggers, Giulia Alessandra Chronic mercury at low doses impairs white adipose tissue plasticity |
| description |
[Introduction]: The toxic effects of mercury (Hg) are involved in homeostasis of energy systems such as lipid and glucose metabolism, and white adipose tissue dysfunction is considered as a central mechanism leading to metabolic disorders. Objective: The aim of this study was to determine the effects of chronic inorganic Hg exposure at low doses on the lipid and glycemic metabolism. |
| author2 |
Ministerio de Economía y Competitividad (España) |
| author_facet |
Ministerio de Economía y Competitividad (España) Rizzetti, Danize Aparecida Corrales, Patricia Trindade Piagette, Janaina Uranga-Ocio, José Antonio Medina-Gómez, Gema Peçanha, Franck Maciel Vassallo, Dalton Valentim Miguel, Marta Wiggers, Giulia Alessandra |
| format |
artículo |
| topic_facet |
Mercury Endoplasmic reticulum stress Lipid and glucose metabolism White adipose tissue |
| author |
Rizzetti, Danize Aparecida Corrales, Patricia Trindade Piagette, Janaina Uranga-Ocio, José Antonio Medina-Gómez, Gema Peçanha, Franck Maciel Vassallo, Dalton Valentim Miguel, Marta Wiggers, Giulia Alessandra |
| author_sort |
Rizzetti, Danize Aparecida |
| title |
Chronic mercury at low doses impairs white adipose tissue plasticity |
| title_short |
Chronic mercury at low doses impairs white adipose tissue plasticity |
| title_full |
Chronic mercury at low doses impairs white adipose tissue plasticity |
| title_fullStr |
Chronic mercury at low doses impairs white adipose tissue plasticity |
| title_full_unstemmed |
Chronic mercury at low doses impairs white adipose tissue plasticity |
| title_sort |
chronic mercury at low doses impairs white adipose tissue plasticity |
| publisher |
Elsevier |
| publishDate |
2019 |
| url |
http://hdl.handle.net/10261/219814 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100004837 http://dx.doi.org/10.13039/501100003593 http://dx.doi.org/10.13039/501100003339 |
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