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Quan C, Zhou S, Zhang Y, Kulyar MFEA, Gong S, Nawaz S, Ahmed AE, Mo Q, Li J. The autophagy-mediated mechanism via TSC1/mTOR signaling pathway in thiram-induced tibial dyschondroplasia of broilers. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 928:172305. [PMID: 38593872 DOI: 10.1016/j.scitotenv.2024.172305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Revised: 04/03/2024] [Accepted: 04/05/2024] [Indexed: 04/11/2024]
Abstract
Thiram is a member of the dithiocarbamate family and is widely used in agriculture, especially in low-income countries. Its residues lead to various diseases, among which tibial dyschondroplasia (TD) in broiler chickens is the most common. Recent studies have also demonstrated that thiram residues may harm human health. Our previous study showed that the activity of the mTOR (mammalian target of rapamycin) signaling pathway has changed after thiram exposure. In the current study, we investigated the effect of autophagy via the mTOR signaling pathway after thiram exposure in vitro and in vivo. Our results showed that thiram inhibited the protein expression of mTOR signaling pathway-related genes such as p-4EBP1 and p-S6K1. The analysis showed a significant increase in the expression of key autophagy-related proteins, including LC3, ULK1, ATG5, and Beclin1. Further investigation proved that the effects of thiram were mediated through the downregulation of mTOR. The mTOR agonist MHY-1485 reverse the upregulation of autophagy caused by thiram in vitro. Moreover, our experiment using knockdown of TSC1 resulted in chondrocytes expressing lower levels of autophagy. In conclusion, our results demonstrate that thiram promotes autophagy via the mTOR signaling pathway in chondrogenesis, providing a potential pharmacological target for the prevention of TD.
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Affiliation(s)
- Chuxian Quan
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, P.R. China
| | - Shimeng Zhou
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, P.R. China
| | - Yan Zhang
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, P.R. China
| | | | - Saisai Gong
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, P.R. China
| | - Shah Nawaz
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, P.R. China
| | - Ahmed Ezzat Ahmed
- Department of Biology, College of Science, King Khalid University, Abha 61413, Saudi Arabia
| | - Quan Mo
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, P.R. China.
| | - Jiakui Li
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, P.R. China.
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Zhang J, Xing Y, Li F, Mu J, Liu T, Ge J, Zhao M, Liu L, Gong D, Geng T. Study on the Mechanism of MC5R Participating in Energy Metabolism of Goose Liver. Int J Mol Sci 2023; 24:ijms24108648. [PMID: 37239994 DOI: 10.3390/ijms24108648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 04/23/2023] [Accepted: 04/28/2023] [Indexed: 05/28/2023] Open
Abstract
Nutrition and energy levels have an important impact on animal growth, production performance, disease occurrence and health recovery. Previous studies indicate that melanocortin 5 receptor (MC5R) is mainly involved in the regulations of exocrine gland function, lipid metabolism and immune response in animals. However, it is not clear how MC5R participates in the nutrition and energy metabolism of animals. To address this, the widely used animal models, including the overfeeding model and the fasting/refeeding model, could provide an effective tool. In this study, the expression of MC5R in goose liver was first determined in these models. Goose primary hepatocytes were then treated with nutrition/energy metabolism-related factors (glucose, oleic acid and thyroxine), which is followed by determination of MC5R gene expression. Moreover, MC5R was overexpressed in goose primary hepatocytes, followed by identification of differentially expressed genes (DEGs) and pathways subjected to MC5R regulation by transcriptome analysis. At last, some of the genes potentially regulated by MC5R were also identified in the in vivo and in vitro models, and were used to predict possible regulatory networks with PPI (protein-protein interaction networks) program. The data showed that both overfeeding and refeeding inhibited the expression of MC5R in goose liver, while fasting induced the expression of MC5R. Glucose and oleic acid could induce the expression of MC5R in goose primary hepatocytes, whereas thyroxine could inhibit it. The overexpression of MC5R significantly affected the expression of 1381 genes, and the pathways enriched with the DEGs mainly include oxidative phosphorylation, focal adhesion, ECM-receptor interaction, glutathione metabolism and MAPK signaling pathway. Interestingly, some pathways are related to glycolipid metabolism, including oxidative phosphorylation, pyruvate metabolism, citrate cycle, etc. Using the in vivo and in vitro models, it was demonstrated that the expression of some DEGs, including ACSL1, PSPH, HMGCS1, CPT1A, PACSIN2, IGFBP3, NMRK1, GYS2, ECI2, NDRG1, CDK9, FBXO25, SLC25A25, USP25 and AHCY, was associated with the expression of MC5R, suggesting these genes may mediate the biological role of MC5R in these models. In addition, PPI analysis suggests that the selected downstream genes, including GYS2, ECI2, PSPH, CPT1A, ACSL1, HMGCS1, USP25 and NDRG1, participate in the protein-protein interaction network regulated by MC5R. In conclusion, MC5R may mediate the biological effects caused by changes in nutrition and energy levels in goose hepatocytes through multiple pathways, including glycolipid-metabolism-related pathways.
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Affiliation(s)
- Jinqi Zhang
- College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China
| | - Ya Xing
- College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China
| | - Fangbo Li
- College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China
| | - Ji'an Mu
- College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China
| | - Tongjun Liu
- College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China
| | - Jing Ge
- College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China
| | - Minmeng Zhao
- College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China
| | - Long Liu
- College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China
| | - Daoqing Gong
- College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China
- Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China, Yangzhou University, Yangzhou 225009, China
| | - Tuoyu Geng
- College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China
- Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China, Yangzhou University, Yangzhou 225009, China
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Ye J, Tian X, Wang Q, Zheng J, Yang Y, Xu B, Zhang S, Yuan F, Yang Z. Monkfish Peptides Mitigate High Fat Diet-Induced Hepatic Steatosis in Mice. Mar Drugs 2022; 20:md20050312. [PMID: 35621963 PMCID: PMC9147042 DOI: 10.3390/md20050312] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2022] [Revised: 05/01/2022] [Accepted: 05/02/2022] [Indexed: 02/05/2023] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) is a hepatic metabolic syndrome usually accompanied by fatty degeneration and functional impairment. The aim of the study was to determine whether monkfish peptides (LPs) could ameliorate high-fat diet (HFD)-induced NAFLD and its underlying mechanisms. NAFLD was induced in mice by giving them an HFD for eight weeks, after which LPs were administered in various dosages. In comparison to the HFD control group: body weight in the LP-treated groups decreased by 23–28%; triacylglycerol levels in the blood decreased by 16–35%; and low-density lipoproteins levels in the blood decreased by 23–51%. Additionally, we found that LPs elevated the activity of hepatic antioxidant enzymes and reduced the inflammatory reactions within fatty liver tissue. Investigating the effect on metabolic pathways, we found that in LP-treated mice: the levels of phospho-AMP-activated protein kinase (p-AMPK), and phospho-acetyl CoA carboxylase (p-ACC) in the AMP-activated protein kinase (AMPK) pathway were up-regulated and the levels of downstream sterol regulatory element-binding transcription factor 1 (SREBP-1) were down-regulated; lipid oxidation increased and free fatty acid (FFA) accumulation decreased (revealed by the increased carnitine palmitoyltransferase-1 (CPT-1) and the decreased fatty acid synthase (FASN) expression, respectively); the nuclear factor erythroid-2-related factor 2 (Nrf2) antioxidant pathway was activated; and the levels of heme oxygenase-1 (HO-1) and nicotinamide quinone oxidoreductase 1 (NQO1) were increased. Overall, all these findings demonstrated that LPs can improve the antioxidant capacity of liver to alleviate NAFLD progression mainly through modulating the AMPK and Nrf2 pathways, and thus it could be considered as an effective candidate in the treatment of human NAFLD.
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Affiliation(s)
- Jiena Ye
- Zhejiang Provincial Engineering Technology Research Center of Marine Biomedical Products, School of Food and Pharmacy, Zhejiang Ocean University, Zhoushan 316022, China; (J.Y.); (X.T.); (J.Z.); (Y.Y.); (B.X.); (S.Z.)
| | - Xiaoxiao Tian
- Zhejiang Provincial Engineering Technology Research Center of Marine Biomedical Products, School of Food and Pharmacy, Zhejiang Ocean University, Zhoushan 316022, China; (J.Y.); (X.T.); (J.Z.); (Y.Y.); (B.X.); (S.Z.)
| | - Qiongfen Wang
- Zhoushan Institute for Food and Drug Control, Zhoushan 316000, China;
| | - Jiawen Zheng
- Zhejiang Provincial Engineering Technology Research Center of Marine Biomedical Products, School of Food and Pharmacy, Zhejiang Ocean University, Zhoushan 316022, China; (J.Y.); (X.T.); (J.Z.); (Y.Y.); (B.X.); (S.Z.)
| | - Yanzhuo Yang
- Zhejiang Provincial Engineering Technology Research Center of Marine Biomedical Products, School of Food and Pharmacy, Zhejiang Ocean University, Zhoushan 316022, China; (J.Y.); (X.T.); (J.Z.); (Y.Y.); (B.X.); (S.Z.)
| | - Baogui Xu
- Zhejiang Provincial Engineering Technology Research Center of Marine Biomedical Products, School of Food and Pharmacy, Zhejiang Ocean University, Zhoushan 316022, China; (J.Y.); (X.T.); (J.Z.); (Y.Y.); (B.X.); (S.Z.)
| | - Shuai Zhang
- Zhejiang Provincial Engineering Technology Research Center of Marine Biomedical Products, School of Food and Pharmacy, Zhejiang Ocean University, Zhoushan 316022, China; (J.Y.); (X.T.); (J.Z.); (Y.Y.); (B.X.); (S.Z.)
| | - Falei Yuan
- Zhejiang Provincial Engineering Technology Research Center of Marine Biomedical Products, School of Food and Pharmacy, Zhejiang Ocean University, Zhoushan 316022, China; (J.Y.); (X.T.); (J.Z.); (Y.Y.); (B.X.); (S.Z.)
- Correspondence: (F.Y.); (Z.Y.)
| | - Zuisu Yang
- Zhejiang Provincial Engineering Technology Research Center of Marine Biomedical Products, School of Food and Pharmacy, Zhejiang Ocean University, Zhoushan 316022, China; (J.Y.); (X.T.); (J.Z.); (Y.Y.); (B.X.); (S.Z.)
- Correspondence: (F.Y.); (Z.Y.)
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Ebeid TA, Tůmová E, Al-Homidan IH, Ketta M, Chodová D. The potential role of feed restriction on productivity, carcass composition, meat quality, and muscle fibre properties of growing rabbits: A review. Meat Sci 2022; 191:108845. [DOI: 10.1016/j.meatsci.2022.108845] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 05/06/2022] [Accepted: 05/07/2022] [Indexed: 10/18/2022]
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Cai J, Hu Q, Lin H, Zhao J, Jiao H, Wang X. Adiponectin/adiponectin receptors mRNA expression profiles in chickens and their response to feed restriction. Poult Sci 2021; 100:101480. [PMID: 34700095 PMCID: PMC8554277 DOI: 10.1016/j.psj.2021.101480] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 09/06/2021] [Accepted: 09/13/2021] [Indexed: 11/08/2022] Open
Abstract
Adiponectin (ADPN) is related to fatty acid synthesis and oxidation in mammals. In chickens, the lipid metabolism, structure and sequence of ADPN are different from that in mammals. The aim of this study was to determine the role of ADPN in broilers lipid metabolism by investigating the temporal and spatial expression profiles of ADPN and its receptors, as well as their response to feed restriction. The results showed that the abdominal fat has the highest expression level, followed by the duodenum, glandular stomach, heart, hypothalamus, liver, and skeletal muscle. Broilers have high energy mobilization during their early stage of growth, in which the fat demand in the liver and muscles is high, thus the expression of ADPN and its receptor are also increased. To study the effects of feed restriction on ADPN and lipid metabolism, broilers were fasted for 12 h and refeed for 2 h. The results showed that fasting decreased the concentration of triglyceride (TG) (P < 0.05) and total cholesterol (TCHO) (P < 0.05) in plasma. The mRNA expression of ADPN in the liver (P < 0.05), breast (P < 0.05) and thigh (P < 0.05), and the mRNA expression of ADPNR1 in the liver (P < 0.05) and duodenum (P < 0.05) were significantly increased in the Fasted group. All above phenomena were recovered after refeeding, suggesting that feed restriction may promote the utilization of fatty acids in active metabolism tissues through ADPN, to guarantee the energy homeostasis of the body. However, the AMP-activated protein kinase (AMPK) signaling pathway and hepatic lipid metabolism were not necessary to cause the above changes under this experimental condition.
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Affiliation(s)
- Jiangxue Cai
- Department of Animal Science & Technology, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, Taian, Shandong, 271018, P. R. China
| | - Qingmei Hu
- Department of Animal Science & Technology, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, Taian, Shandong, 271018, P. R. China
| | - Hai Lin
- Department of Animal Science & Technology, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, Taian, Shandong, 271018, P. R. China
| | - Jingpeng Zhao
- Department of Animal Science & Technology, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, Taian, Shandong, 271018, P. R. China
| | - Hongchao Jiao
- Department of Animal Science & Technology, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, Taian, Shandong, 271018, P. R. China
| | - Xiaojuan Wang
- Department of Animal Science & Technology, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, Taian, Shandong, 271018, P. R. China.
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Lamberigts C, Wang Y, Dierckx T, Buys N, Everaert N, Buyse J. The influence of thyroid state on hypothalamic AMP-activated protein kinase pathways in broilers. Gen Comp Endocrinol 2021; 311:113838. [PMID: 34181935 DOI: 10.1016/j.ygcen.2021.113838] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 06/21/2021] [Accepted: 06/23/2021] [Indexed: 12/12/2022]
Abstract
To investigate whether there are important interactions in play in broilers between thyroid hormones and the central regulation of energy homeostasis through AMP-activated protein kinase (AMPK), we induced a functional hyperthyroid and hypothyroid state in broiler chicks, and quantified systemic and hypothalamic AMPK related gene expression and related protein. Thyroid state was manipulated through dietary supplementation of triiodothyronine (T3) or methimazole (MMI) for 7 days. A hypothalamic AMPK suppressor, 0.1% α-lipoic acid (α-LA) was used to assess the effects of the T3 and MMI feed formulations on the AMPK pathways. Feed intake and body weight were reduced in both hypothyroid and hyperthyroid conditions. In hyperthyroid conditions (T3 supplementation) expression of the AMPKα1 subunit increased, while in hypothyroid conditions (MMI supplementation) active phosphorylated AMPK levels in the hypothalamus dropped, but gene expression of the AMPKα1 and α2 subunit increased. For FAS and ACC (involved in fatty acid metabolism), and CRH, TRH and CNR1 (anorexigenic neuropeptides stimulating energy expenditure) there were indications that their regulation in response to thyroid state might be modulated through AMPK pathways. Our results indicate that the expression of hypothalamic AMPK as well as that of several other genes from AMPK pathways are involved in thyroid-hormone-induced changes in appetite, albeit differently according to thyroid state.
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Affiliation(s)
- C Lamberigts
- Laboratory of Livestock Physiology, Department of Biosystems, KU Leuven, Kasteelpark Arenberg 30, 3001 Leuven, Belgium
| | - Y Wang
- Laboratory of Livestock Physiology, Department of Biosystems, KU Leuven, Kasteelpark Arenberg 30, 3001 Leuven, Belgium
| | - T Dierckx
- Laboratory of Clinical and Epidemiological Virology, Department of Microbiology and Immunology, Rega Institute for Medical Research, KU Leuven, Herestraat 49 box 1030, 3000 Leuven, Belgium
| | - N Buys
- Laboratory of Livestock Genetics, Department of Biosystems, KU Leuven, Kasteelpark Arenberg 30, 3001 Leuven, Belgium
| | - N Everaert
- Precision Livestock and Nutrition Laboratory, Teaching and Research Centre (TERRA), Gembloux AgroBioTech, University of Liège, Passage des Déportés 2, 5030 Gembloux, Belgium
| | - J Buyse
- Laboratory of Livestock Physiology, Department of Biosystems, KU Leuven, Kasteelpark Arenberg 30, 3001 Leuven, Belgium.
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Al-Abdullatif AA, Al-Sagan AA, Hussein EOS, Saadeldin IM, Suliman GM, Azzam MM, Al-Mufarrej SI, Alhotan RA. Betaine could help ameliorate transport associated water deprivation stress in broilers by reducing the expression of stress-related transcripts and modulating water channel activity. ITALIAN JOURNAL OF ANIMAL SCIENCE 2021. [DOI: 10.1080/1828051x.2020.1865213] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
| | | | | | - Islam M. Saadeldin
- Department of Animal Production, King Saud University, Riyadh, Saudi Arabia
| | | | - Mahmoud M. Azzam
- Department of Animal Production, King Saud University, Riyadh, Saudi Arabia
| | | | - Rashed A. Alhotan
- Department of Animal Production, King Saud University, Riyadh, Saudi Arabia
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Evaluation of the Relationship between Adipose Metabolism Patterns and Secretion of Appetite-Related Endocrines on Chicken. Animals (Basel) 2020; 10:ani10081282. [PMID: 32727133 PMCID: PMC7460314 DOI: 10.3390/ani10081282] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 07/23/2020] [Accepted: 07/24/2020] [Indexed: 12/22/2022] Open
Abstract
Simple Summary The weight of an animal conforms to a certain growth pattern. Among others, feed, environment, and body composition, in addition to genetics, affect the animal’s feed consumption and body weight. Under normal circumstances, the body weight of an animal is mainly affected by feed intake, and body composition may significantly influence feed intake. Therefore, this report sets out the effects of fat accumulation on lipid metabolism and appetite, and finally introduces the effects of feeding patterns on animal feed intake. Abstract In addition to the influence of genes, the quality of poultry products is mainly controlled by the rearing environment or feed composition during rearing, and has to meet human use and economical needs. As the only source of energy for poultry, feed considerably affects the metabolic pattern of poultry and further affects the regulation of appetite-related endocrine secretion in poultry. Under normal circumstances, the accumulation of lipid in adipose reduces feed intake in poultry and increases the rate of adipose metabolism. When the adipose content in cells decreases, endocrines that promote food intake are secreted and increase nutrient concentrations in serum and cells. By regulating the balance between appetite and adipose metabolism, the poultry’s growth and posture can maintain a balanced state. In addition, increasing fiber composition in feed can effectively increase poultry welfare, body weight, lean composition and antioxidant levels in poultry. According to this, the concept that proper fiber content should be added to feed should be considered for better economic benefits, poultry welfare and meat productivity.
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Wu Z, Zhang Y, Gong X, Cheng G, Pu S, Cai S. The preventive effect of phenolic-rich extracts from Chinese sumac fruits against nonalcoholic fatty liver disease in rats induced by a high-fat diet. Food Funct 2020; 11:799-812. [PMID: 31930271 DOI: 10.1039/c9fo02262g] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The objective of this study is to investigate the preventive effect of phenolic-rich extracts from Chinese sumac (Rhus chinensis Mill.) fruits against NAFLD in rats induced by a high-fat diet and to clarify the underlying mechanisms.
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Affiliation(s)
- Zihuan Wu
- Faculty of Agriculture and Food
- Yunnan Institute of Food Safety
- Kunming University of Science and Technology
- Kunming
- People's Republic of China
| | - Yan Zhang
- The First People's Hospital of Yunnan Province and the Affiliated Kunhua Hospital of Kunming University of Science and Technology
- Kunming
- People's Republic of China
| | - Xiarong Gong
- The First People's Hospital of Yunnan Province and the Affiliated Kunhua Hospital of Kunming University of Science and Technology
- Kunming
- People's Republic of China
| | - Guiguang Cheng
- Faculty of Agriculture and Food
- Yunnan Institute of Food Safety
- Kunming University of Science and Technology
- Kunming
- People's Republic of China
| | - Shibiao Pu
- Chinese Materia Medica
- Yunnan University of Chinese Medicine
- Kunming
- People's Republic of China
| | - Shengbao Cai
- Faculty of Agriculture and Food
- Yunnan Institute of Food Safety
- Kunming University of Science and Technology
- Kunming
- People's Republic of China
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Wang Y, Buyse J, Courousse N, Tesseraud S, Métayer-Coustard S, Berri C, Schallier S, Everaert N, Collin A. Effects of sex and fasting/refeeding on hepatic AMPK signaling in chickens (Gallus gallus). Comp Biochem Physiol A Mol Integr Physiol 2019; 240:110606. [PMID: 31676410 DOI: 10.1016/j.cbpa.2019.110606] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 10/10/2019] [Accepted: 10/18/2019] [Indexed: 11/16/2022]
Abstract
The alpha-1 isoform of chicken AMPK situates on the Z-chromosome, in contrast, the other isoforms in birds and the mammalian AMPKα1 are located on the autosomes. The present study aimed to investigate the role of hepatic AMPK signaling in adaptation to nutritional status and the potential sex-specific response in chickens. Hepatic genes and proteins were compared between the two sexes immediately after hatching. From 20d of age, chicks from each sex received feed treatments: Control was fed ad libitum; Fasted was starved for 24 h; Refed was fed for 4 h after a 24 h fasting. As a result, hepatic AMPKα1 mRNA level in males was significantly higher at both ages compared to females, due to the presence of Z-chromosomes. However, this did not make this kinase "male-bias" as it was eventually compensated at a translational level, which was not reported in previous studies. The protein levels and activation of AMPKα were even lower in newly-hatched male compared to female chicks, accompanied with a higher FAS and SREBP-1 gene expressions. Accordingly, hepatic G6PC2 mRNA levels in males were significantly lower associated with lower plasma glucose levels after hatching. Fasting activated hepatic AMPK, which in turn inhibited gene expression of GS, FAS and SREBP-1, and stimulated the downstream G6PC2 in both sexes. These changes recovered after refeeding. In conclusion, AMPK plays a role in adaptation to nutritional environment for both sexes. The Z-linked AMPK did not exert a sex-specific signaling, due to a "translational compensation" of AMPKα1.
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Affiliation(s)
- Yufeng Wang
- Laboratory of Livestock Physiology, Department of Biosystems, KU Leuven, Kasteelpark Arenberg 30, 3001 Leuven, Belgium
| | - Johan Buyse
- Laboratory of Livestock Physiology, Department of Biosystems, KU Leuven, Kasteelpark Arenberg 30, 3001 Leuven, Belgium.
| | | | | | | | - Cécile Berri
- BOA, INRA, Université de Tours, 37380 Nouzilly, France
| | - Seline Schallier
- Laboratory of Livestock Physiology, Department of Biosystems, KU Leuven, Kasteelpark Arenberg 30, 3001 Leuven, Belgium
| | - Nadia Everaert
- Livestock and Nutrition Unit, Gembloux Agro-Bio Tech, TERRA Teaching and Research Centre, University of Liège, Passage des Déportés 2, 5030 Gembloux, Belgium
| | - Anne Collin
- BOA, INRA, Université de Tours, 37380 Nouzilly, France
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Chodkowska KA, Ciecierska A, Majchrzak K, Ostaszewski P, Sadkowski T. Simultaneous miRNA and mRNA Transcriptome Profiling of Differentiating Equine Satellite Cells Treated with Gamma-Oryzanol and Exposed to Hydrogen Peroxide. Nutrients 2018; 10:nu10121871. [PMID: 30513813 PMCID: PMC6316332 DOI: 10.3390/nu10121871] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 11/25/2018] [Accepted: 11/28/2018] [Indexed: 12/11/2022] Open
Abstract
Gamma-oryzanol (GO) is a popular supplement for performance horses, dogs, and humans. Previous studies indicated that GO supplementation decreases creatine kinase activity and lactate level after exercise and may affect oxidative stress in Thoroughbred horses. GO may change genes expression in equine satellite cells (ESC). The purpose of this study was to evaluate the effect of GO on miRNA, gene expression, oxidative stress, and cell damage and viability in differentiating ESC pretreated with hydrogen peroxide (H2O2). ESCs were obtained from a young horse’s skeletal muscle. ESCs were pre-incubated with GO (24 h) and then exposed to H2O2 for one hour. For the microRNA and gene expression assessment, the microarray technique was used. Identified miRNAs and genes were validated using real time-quantitative polymerase chain reaction. Several tests related to cell viability, cell damage, and oxidative stress were performed. The microarray analysis revealed differences in 17 miRNAs and 202 genes between GO-treated and control ESC. The tests related to apoptosis, cell viability, and oxidative stress showed that GO affects these processes to varying degrees. Our results suggest that GO can change miRNA and gene expression and may impact the processes involved in tissue repairing after an injury.
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Affiliation(s)
- Karolina A Chodkowska
- Department of Physiological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences-SGGW, Nowoursynowska 159, 02-776 Warsaw, Poland.
| | - Anna Ciecierska
- Department of Physiological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences-SGGW, Nowoursynowska 159, 02-776 Warsaw, Poland.
| | - Kinga Majchrzak
- Department of Physiological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences-SGGW, Nowoursynowska 159, 02-776 Warsaw, Poland.
| | - Piotr Ostaszewski
- Department of Physiological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences-SGGW, Nowoursynowska 159, 02-776 Warsaw, Poland.
| | - Tomasz Sadkowski
- Department of Physiological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences-SGGW, Nowoursynowska 159, 02-776 Warsaw, Poland.
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Craig PM, Moyes CD, LeMoine CM. Sensing and responding to energetic stress: Evolution of the AMPK network. Comp Biochem Physiol B Biochem Mol Biol 2018; 224:156-169. [DOI: 10.1016/j.cbpb.2017.11.001] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Revised: 11/01/2017] [Accepted: 11/01/2017] [Indexed: 01/24/2023]
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13
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Zhao M, Gong D, Gao T, Zhang L, Li J, Lv P, Yu L, Zhou G, Gao F. In Ovo Feeding of Creatine Pyruvate Increases the Glycolysis Pathway, Glucose Transporter Gene Expression, and AMPK Phosphorylation in Breast Muscle of Neonatal Broilers. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:7684-7691. [PMID: 29974734 DOI: 10.1021/acs.jafc.8b02557] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
This study aims to investigate in ovo feeding (IOF) of creatine pyruvate (CrPyr) on glucose metabolism, hormone concentration, and the 5'-AMP-activated protein kinase (AMPK) pathway in breast muscle of embryos and neonatal broilers. The three treatments were noninjected control, 0.75% NaCl treatment, and 12 mg CrPyr/egg treatment. The solution was injected on the 17.5 day of incubation. At hatch, 120 male broilers from each treatment were chosen for a 7 day feeding trial. Compared with other treatments, CrPyr treated broilers enhanced insulin and thyroxine levels in plasma, adenosine triphosphate (ATP) concentration, hexokinase and pyruvate kinase activities, glucose transporter protein mRNA expressions, as well as protein abundances of phosphor-liver kinase B1 and phosphor-AMPK in breast muscle at hatch. In conclusion, IOF of CrPyr improved the energy status, increased the gene expression of glucose transporter proteins, and facilitated glycolysis in breast muscle, which may be associated with the activated AMPK pathway.
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Affiliation(s)
- Minmeng Zhao
- College of Animal Science and Technology, Jiangsu Key Laboratory of Animal Origin Food Production and Safety Guarantee, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control , Nanjing Agricultural University , Nanjing 210095 , P. R. China
- College of Animal Science and Technology , Yangzhou University , Yangzhou 225009 , P. R. China
| | - Daoqing Gong
- College of Animal Science and Technology , Yangzhou University , Yangzhou 225009 , P. R. China
| | - Tian Gao
- College of Animal Science and Technology, Jiangsu Key Laboratory of Animal Origin Food Production and Safety Guarantee, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control , Nanjing Agricultural University , Nanjing 210095 , P. R. China
| | - Lin Zhang
- College of Animal Science and Technology, Jiangsu Key Laboratory of Animal Origin Food Production and Safety Guarantee, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control , Nanjing Agricultural University , Nanjing 210095 , P. R. China
| | - Jiaolong Li
- College of Animal Science and Technology, Jiangsu Key Laboratory of Animal Origin Food Production and Safety Guarantee, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control , Nanjing Agricultural University , Nanjing 210095 , P. R. China
| | - Peng'an Lv
- College of Animal Science and Technology, Jiangsu Key Laboratory of Animal Origin Food Production and Safety Guarantee, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control , Nanjing Agricultural University , Nanjing 210095 , P. R. China
| | - Lanlin Yu
- College of Animal Science and Technology, Jiangsu Key Laboratory of Animal Origin Food Production and Safety Guarantee, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control , Nanjing Agricultural University , Nanjing 210095 , P. R. China
| | - Guanghong Zhou
- College of Animal Science and Technology, Jiangsu Key Laboratory of Animal Origin Food Production and Safety Guarantee, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control , Nanjing Agricultural University , Nanjing 210095 , P. R. China
| | - Feng Gao
- College of Animal Science and Technology, Jiangsu Key Laboratory of Animal Origin Food Production and Safety Guarantee, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control , Nanjing Agricultural University , Nanjing 210095 , P. R. China
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14
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He X, Lu Z, Ma B, Zhang L, Li J, Jiang Y, Zhou G, Gao F. Chronic Heat Stress Damages Small Intestinal Epithelium Cells Associated with the Adenosine 5'-Monophosphate-Activated Protein Kinase Pathway in Broilers. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:7301-7309. [PMID: 29954175 DOI: 10.1021/acs.jafc.8b02145] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Heat-stressed broilers usually reduce their feed intake, leading to energy imbalance and disturbing the homeostasis in the small intestine. This study was aimed to explore heat-stress-mediated physiological features that may be ascribed to impairments in the intestinal tract of broilers. The results revealed that heat exposure increased the activities of trypsin and Na+/K+-ATPase, while it decreased the activities of amylase, lipase, and maltase as well as the proliferating cell nuclear antigen cells in the jejunum after 14 days of heat exposure. Meanwhile, heat stress upregulated the mRNA expressions of AMPKα1, LKB1, and HIF-1α and protein expressions of p-AMPKαThr172 and p-LKB1Thr189 in the small intestine after 7 or 14 days of heat exposure. In conclusion, chronic heat exposure impeded the development of digestive organs, disordered the activities of intestinal digestive enzymes, and impaired the intestinal epithelial cells by increasing the cell apoptosis and declining cell proliferation, which might be correlated with the adenosine 5'-monophosphate-activated protein kinase signaling pathway. Additionally, heat stress upregulated the gene expression of HIF-1α, which indicated that heat stress may disturb the homeostasis in the intestine.
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Affiliation(s)
- Xiaofang He
- College of Animal Science and Technology, Key Laboratory of Animal Origin Food Production and Safety Guarantee of Jiangsu Province, and Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control , Nanjing Agricultural University , Nanjing , Jiangsu 210095 , People's Republic of China
| | - Zhuang Lu
- College of Animal Science and Technology, Key Laboratory of Animal Origin Food Production and Safety Guarantee of Jiangsu Province, and Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control , Nanjing Agricultural University , Nanjing , Jiangsu 210095 , People's Republic of China
| | - Bingbing Ma
- College of Animal Science and Technology, Key Laboratory of Animal Origin Food Production and Safety Guarantee of Jiangsu Province, and Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control , Nanjing Agricultural University , Nanjing , Jiangsu 210095 , People's Republic of China
| | - Lin Zhang
- College of Animal Science and Technology, Key Laboratory of Animal Origin Food Production and Safety Guarantee of Jiangsu Province, and Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control , Nanjing Agricultural University , Nanjing , Jiangsu 210095 , People's Republic of China
| | - Jiaolong Li
- College of Animal Science and Technology, Key Laboratory of Animal Origin Food Production and Safety Guarantee of Jiangsu Province, and Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control , Nanjing Agricultural University , Nanjing , Jiangsu 210095 , People's Republic of China
| | - Yun Jiang
- Ginling College , Nanjing Normal University , Nanjing , Jiangsu 210097 , People's Republic of China
| | - Guanghong Zhou
- College of Animal Science and Technology, Key Laboratory of Animal Origin Food Production and Safety Guarantee of Jiangsu Province, and Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control , Nanjing Agricultural University , Nanjing , Jiangsu 210095 , People's Republic of China
| | - Feng Gao
- College of Animal Science and Technology, Key Laboratory of Animal Origin Food Production and Safety Guarantee of Jiangsu Province, and Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control , Nanjing Agricultural University , Nanjing , Jiangsu 210095 , People's Republic of China
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15
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Gilani S, Howarth GS, Nattrass G, Kitessa SM, Barekatain R, Forder REA, Tran CD, Hughes RJ. Gene expression and morphological changes in the intestinal mucosa associated with increased permeability induced by short-term fasting in chickens. J Anim Physiol Anim Nutr (Berl) 2017; 102:e653-e661. [PMID: 29034530 DOI: 10.1111/jpn.12808] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Accepted: 08/02/2017] [Indexed: 01/23/2023]
Abstract
Short-term fasting for 4.5 and 9 hr has been demonstrated to increase intestinal permeability (IP) in chickens. This study aimed to investigate the effects of 0, 4.5, 9 and 19.5 hr fasting on intestinal gene expression and villus-crypt architecture of enterocytes in jejunal and ileal samples. On day 38, Ross-308 male birds were fasted according to their group and then euthanised. Two separate intestinal sections (each 2 cm long, jejunum and ileum) were collected. One section was utilised for villus height and crypt depth measurements. The second section was snap-frozen in liquid nitrogen for quantitative polymerase chain reaction (qPCR) analysis of tight junction proteins (TJP) including claudin-1, claudin-3, occludin, zonula occludens (ZO-1, ZO-2), junctional adhesion molecules (JAM) and E-cadherin. Additionally genes involved in enterocyte protection including glucagon-like peptide (GLP-2), heat-shock protein (HSP-70), intestinal alkaline phosphatase (IAP), mammalian target of rapamycin (mTOR), toll-like receptors (TLR-4), mucin (MUC-2), cluster differentiation (CD-36) and fatty acid-binding protein (FABP-6) were also analysed. Normally distributed data were analysed using one-way analysis of variance ANOVA. Other data were analysed by non-parametric one-way ANOVA. Villus height and crypt depth were increased (p < .05) only in the ileum after fasting for 4.5 and 9 hr compared with non-fasting group. mRNA expression of claudin-3 was significantly reduced in the ileum of birds fasted for 9 and 19.5 hr, suggesting a role in IP modulation. However, all other TJP genes examined were not statistically different from control. Nevertheless, ileal FABP-6 of all fasted groups was significantly reduced, which could possibly be due to reduced bile acid production during fasting.
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Affiliation(s)
- S Gilani
- School of Animal and Veterinary Sciences, University of Adelaide, Adelaide, SA, Australia.,Poultry CRC, University of New England, Armidale, NSW, Australia
| | - G S Howarth
- School of Animal and Veterinary Sciences, University of Adelaide, Adelaide, SA, Australia
| | - G Nattrass
- South Australian Research and Development Institute, University of Adelaide, Roseworthy, SA, Australia
| | - S M Kitessa
- South Australian Research and Development Institute, University of Adelaide, Roseworthy, SA, Australia
| | - R Barekatain
- School of Animal and Veterinary Sciences, University of Adelaide, Adelaide, SA, Australia.,South Australian Research and Development Institute, University of Adelaide, Roseworthy, SA, Australia
| | - R E A Forder
- School of Animal and Veterinary Sciences, University of Adelaide, Adelaide, SA, Australia
| | - C D Tran
- Health and Biosecurity, Commonwealth Scientific and Industrial Research Organisation, Adelaide, SA, Australia.,Faculty of Health Sciences, School of Medicine, University of Adelaide, Adelaide, SA, Australia
| | - R J Hughes
- School of Animal and Veterinary Sciences, University of Adelaide, Adelaide, SA, Australia.,South Australian Research and Development Institute, University of Adelaide, Roseworthy, SA, Australia
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Zhang L, Wang X, Li J, Zhu X, Gao F, Zhou G. Creatine Monohydrate Enhances Energy Status and Reduces Glycolysis via Inhibition of AMPK Pathway in Pectoralis Major Muscle of Transport-Stressed Broilers. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017; 65:6991-6999. [PMID: 28766947 DOI: 10.1021/acs.jafc.7b02740] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Creatine monohydrate (CMH) contributes to reduce transport-induced muscle rapid glycolysis and improve meat quality of broilers, but the underlying mechanism is still unknown. Therefore, this study aimed to investigate the molecular mechanisms underlying the ameliorative effects of CMH on muscle glycolysis metabolism of transported broilers during summer. The results showed that 3 h transport during summer elevated chicken live weight loss and plasma corticosterone concentration; decreased muscle concentrations of ATP, creatine, and energy charge value; increased muscle AMP concentration and AMP/ATP ratio; and upregulated muscle mRNA expression of LKB1 and AMPKα2, as well as protein expression of p-LKB1Thr189 and p-AMPKαThr172, which subsequently resulted in rapid glycolysis in the pectoralis major muscle and consequent reduction of meat quality. Dietary addition of CMH at 1200 mg/kg ameliorated transport-induced rapid muscle glycolysis and reduction of meat quality via enhancement of the energy-buffering capacity of intramuscular phosphocreatine/creatine system and inhibition of AMPK pathway.
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Affiliation(s)
- Lin Zhang
- College of Animal Science and Technology, Jiangsu Key Laboratory of Animal Origin Food Production and Safety Guarantee, Jiangsu Key Laboratory of Gastrointestinal Nutrition and Animal Health, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control, Nanjing Agricultural University , Nanjing, Jiangsu 210095, China
| | - Xiaofei Wang
- College of Animal Science and Technology, Jiangsu Key Laboratory of Animal Origin Food Production and Safety Guarantee, Jiangsu Key Laboratory of Gastrointestinal Nutrition and Animal Health, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control, Nanjing Agricultural University , Nanjing, Jiangsu 210095, China
- College of Science, Nanjing Agricultural University , Nanjing, Jiangsu 210095, China
| | - Jiaolong Li
- College of Animal Science and Technology, Jiangsu Key Laboratory of Animal Origin Food Production and Safety Guarantee, Jiangsu Key Laboratory of Gastrointestinal Nutrition and Animal Health, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control, Nanjing Agricultural University , Nanjing, Jiangsu 210095, China
| | - Xudong Zhu
- College of Animal Science and Technology, Jiangsu Key Laboratory of Animal Origin Food Production and Safety Guarantee, Jiangsu Key Laboratory of Gastrointestinal Nutrition and Animal Health, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control, Nanjing Agricultural University , Nanjing, Jiangsu 210095, China
- College of Science, Nanjing Agricultural University , Nanjing, Jiangsu 210095, China
| | - Feng Gao
- College of Animal Science and Technology, Jiangsu Key Laboratory of Animal Origin Food Production and Safety Guarantee, Jiangsu Key Laboratory of Gastrointestinal Nutrition and Animal Health, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control, Nanjing Agricultural University , Nanjing, Jiangsu 210095, China
| | - Guanghong Zhou
- College of Animal Science and Technology, Jiangsu Key Laboratory of Animal Origin Food Production and Safety Guarantee, Jiangsu Key Laboratory of Gastrointestinal Nutrition and Animal Health, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control, Nanjing Agricultural University , Nanjing, Jiangsu 210095, China
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17
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Xylazine Activates Adenosine Monophosphate-Activated Protein Kinase Pathway in the Central Nervous System of Rats. PLoS One 2016; 11:e0153169. [PMID: 27049320 PMCID: PMC4822969 DOI: 10.1371/journal.pone.0153169] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Accepted: 03/24/2016] [Indexed: 01/03/2023] Open
Abstract
Xylazine is a potent analgesic extensively used in veterinary and animal experimentation. Evidence exists that the analgesic effect can be inhibited using adenosine 5'-monophosphate activated protein kinase (AMPK) inhibitors. Considering this idea, the aim of this study was to investigate whether the AMPK signaling pathway is involved in the central analgesic mechanism of xylazine in the rat. Xylazine was administrated via the intraperitoneal route. Sprague-Dawley rats were sacrificed and the cerebral cortex, cerebellum, hippocampus, thalamus and brainstem were collected for determination of liver kinase B1 (LKB1) and AMPKα mRNA expression using quantitative real-time polymerase chain reaction (qPCR), and phosphorylated LKB1 and AMPKα levels using western blot. The results of our study showed that compared with the control group, xylazine induced significant increases in AMPK activity in the cerebral cortex, hippocampus, thalamus and cerebellum after rats received xylazine (P < 0.01). Increased AMPK activities were accompanied with increased phosphorylation levels of LKB1 in corresponding regions of rats. The protein levels of phosphorylated LKB1 and AMPKα in these regions returned or tended to return to control group levels. However, in the brainstem, phosphorylated LKB1 and AMPKα protein levels were decreased by xylazine compared with the control (P < 0.05). In conclusion, our data indicates that xylazine alters the activities of LKB1 and AMPK in the central nervous system of rats, which suggests that xylazine affects the regulatory signaling pathway of the analgesic mechanism in the rat brain.
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