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Pruszynska-Oszmalek E, Kolodziejski PA, Kaczmarek P, Sassek M, Szczepankiewicz D, Mikula R, Nowak KW. Orexin A but not orexin B regulates lipid metabolism and leptin secretion in isolated porcine adipocytes. Domest Anim Endocrinol 2018; 63:59-68. [PMID: 29413903 DOI: 10.1016/j.domaniend.2017.12.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2017] [Revised: 11/29/2017] [Accepted: 12/29/2017] [Indexed: 01/10/2023]
Abstract
It is well known that orexins are involved in the metabolism and endocrine function of rodent adipocytes, but there are no data on other animal species, including pigs. Therefore, in this study, we tested the hypothesis that orexin A (OxA) and orexin B (OxB) modulate the metabolism and endocrine functions of isolated porcine adipocytes and adipose tissue explants. Moreover, we characterized the possible mechanism of OxA action in porcine adipocytes. According to the results, both orexin receptor 1 and orexin receptor 2 were expressed in the porcine adipose tissue. We found that OxA suppressed the release of glycerol from porcine adipocytes both in the absence (basal lipolysis; P < 0.05) and in the presence (stimulated lipolysis; P < 0.05) of isoproterenol. Orexin A increased basal and insulin-stimulated glucose uptake (P < 0.05), as well as it enhanced the rate of glucose incorporation into lipids with insulin (stimulated lipogenesis; P < 0.01) or without insulin (basal; P < 0.05). We have also shown that OxA stimulated the mRNA expression of glucose transporter 4 (P < 0.05) and its translocation into the plasma membrane (P < 0.01). Moreover, OxA upregulated the mRNA expression of leptin in isolated porcine adipocytes (P < 0.05) and increased the secretion of leptin (P < 0.05). We have also demonstrated one of the possible mechanisms of OxA action in adipocytes. In the presence of extracellular-signal-regulated kinase 1 and 2 (ERK1/2) inhibitor, the effect of OxA was not detectable in porcine adipocytes, which indicates that this peptide increased cell viability via ERK1/2 pathway (P < 0.05). However, OxB did not show any effect on the metabolism and endocrine functions of porcine adipocytes. In summary, we have shown for the first time that OxA has a significant impact on the intensity of lipolysis, glucose uptake, lipogenesis, as well as on the expression and secretion of leptin. Therefore, we conclude that OxA but not OxB regulates lipid metabolism in porcine adipose tissue and that this regulation is partly mediated via ERK1/2 pathway. The action of orexins should be further explored to better understand their role in the regulation of adiposity in pigs.
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Affiliation(s)
- E Pruszynska-Oszmalek
- Department of Animal Physiology and Biochemistry, Poznan University of Life Sciences, Wołynska Street 35, 60-637 Poznan, Poland.
| | - P A Kolodziejski
- Department of Animal Physiology and Biochemistry, Poznan University of Life Sciences, Wołynska Street 35, 60-637 Poznan, Poland
| | - P Kaczmarek
- Department of Animal Physiology and Biochemistry, Poznan University of Life Sciences, Wołynska Street 35, 60-637 Poznan, Poland
| | - M Sassek
- Department of Animal Physiology and Biochemistry, Poznan University of Life Sciences, Wołynska Street 35, 60-637 Poznan, Poland
| | - D Szczepankiewicz
- Department of Animal Physiology and Biochemistry, Poznan University of Life Sciences, Wołynska Street 35, 60-637 Poznan, Poland
| | - R Mikula
- Department of Animal Nutrition and Feed Management, Poznan University of Life Sciences, Wołynska Street 33, 60-637 Poznan, Poland
| | - K W Nowak
- Department of Animal Physiology and Biochemistry, Poznan University of Life Sciences, Wołynska Street 35, 60-637 Poznan, Poland
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Castellani M, Felaco M, Pandolfi F, Salini V, De Amicis D, Orso C, Vecchiet J, Tetè S, Ciampoli C, Conti F, Cerulli G, Caraffa A, Antinolfi P, Cuccurullo C, Felaco P, Kempuraj D, Boscolo P, Sabatino G, Shaik Y. Mast Cells and Arachidonic Acid Cascade in Inflammation. EUR J INFLAMM 2017. [DOI: 10.1177/1721727x0900700302] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Prostaglandin D2 PGD2 is a major cyclooxygenase metabolite of arachidonic acid produced by mast cells and it is released following allergen challenge in diseases, such as allergic diseases. PGD2 may act as a neuromodulator and as an allergic and inflammatory mediator. In allergic diseases, activated mast cell synthesizes prostaglandin D2 (first cyclo-oxygenate mediator) which has bronchoconstrictive and vasodilating effects and attracts several leukocytes. It has been found that activated mast cells, challenged with physiological and non- physiological secretagogues, release elevated histamine and tryptase and chymase, leukotrienes B4, C4 and D4, 5-hydroxyeicosatetraenoic acid, PGD2, Platelet Activating Factor (PAF), heparin, and high-molecular-weight neutrophil chemotactic factor and cytokines/chemokines. PGD2 exerts its biological activity through the DP and CRTH2 receptors and their cDNA cloning which were characterized 15 years ago. In this report, we revisited the biological effects of arachidonic acid compounds released by activated mast cells in allergic and inflammatory states.
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Affiliation(s)
- M.L. Castellani
- Immunology Division, Medical School, University of Chieti-Pescara, Italy
| | - M. Felaco
- Division of Biology, University of Chieti, Italy
| | | | - V. Salini
- Department of Human Dynamics, University of Chieti-Pescara, Italy
| | - D. De Amicis
- Department of Human Dynamics, University of Chieti-Pescara, Italy
| | - C. Orso
- Department of Human Dynamics, University of Chieti-Pescara, Italy
| | - J. Vecchiet
- Clinic of Infectious Diseases, Medical School, University of Chieti-Pescara, Italy
| | - S. Tetè
- Dental School, University of Chieti-Pescara, Italy
| | - C. Ciampoli
- Dental School, University of Chieti-Pescara, Italy
| | - F. Conti
- Gynecology Division, University of Chieti, Italy
| | - G. Cerulli
- Orthopeadics Division, University of Perugia, Italy
| | - A. Caraffa
- Orthopeadics Division, University of Perugia, Italy
| | - P. Antinolfi
- Orthopeadics Division, University of Perugia, Italy
| | | | - P. Felaco
- Nephrology Division, University of Chieti, Chieti, Italy
| | - D. Kempuraj
- Department of Pharmacology and Experimental Therapeutics, Biochemistry and Internal Medicine Tufts University School of Medicine, Tufts-New England Medical Center, Boston, MA, USA
| | - P. Boscolo
- Department of Biomedical Science, University of Chieti, Chieti, Italy
| | - G. Sabatino
- Department of Paediatrics, G. d'Annunzio University of Chieti-Pescara, Chieti, Italy
| | - Y.B. Shaik
- Department of Medicine, Boston University School of Medicine, Boston, MA, USA
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Martins PJF, Marques MS, Tufik S, D'Almeida V. Orexin activation precedes increased NPY expression, hyperphagia, and metabolic changes in response to sleep deprivation. Am J Physiol Endocrinol Metab 2010; 298:E726-34. [PMID: 20051529 DOI: 10.1152/ajpendo.00660.2009] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Several pieces of evidence support that sleep duration plays a role in body weight control. Nevertheless, it has been assumed that, after the identification of orexins (hypocretins), the molecular basis of the interaction between sleep and energy homeostasis has been provided. However, no study has verified the relationship between neuropeptide Y (NPY) and orexin changes during hyperphagia induced by sleep deprivation. In the current study we aimed to establish the time course of changes in metabolite, endocrine, and hypothalamic neuropeptide expression of Wistar rats sleep deprived by the platform method for a distinct period (from 24 to 96 h) or sleep restricted for 21 days (SR-21d). Despite changes in the stress hormones, we found no changes in food intake and body weight in the SR-21d group. However, sleep-deprived rats had a 25-35% increase in their food intake from 72 h accompanied by slight weight loss. Such changes were associated with increased hypothalamus mRNA levels of prepro-orexin (PPO) at 24 h followed by NPY at 48 h of sleep deprivation. Conversely, sleep recovery reduced the expression of both PPO and NPY, which rapidly brought the animals to a hypophagic condition. Our data also support that sleep deprivation rapidly increases energy expenditure and therefore leads to a negative energy balance and a reduction in liver glycogen and serum triacylglycerol levels despite the hyperphagia. Interestingly, such changes were associated with increased serum levels of glucagon, corticosterone, and norepinephrine, but no effects on leptin, insulin, or ghrelin were observed. In conclusion, orexin activation accounts for the myriad changes induced by sleep deprivation, especially the hyperphagia induced under stress and a negative energy balance.
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