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Zhao Y, He S, Huang J, Liu M. Genome-Wide Association Analysis of Muscle pH in Texel Sheep × Altay Sheep F 2 Resource Population. Animals (Basel) 2023; 13:2162. [PMID: 37443959 DOI: 10.3390/ani13132162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 05/29/2023] [Accepted: 06/25/2023] [Indexed: 07/15/2023] Open
Abstract
pH was one of the important meat quality traits, which was an important factor affecting the storage/shelf life and quality of meat in meat production. In order to find a way to extend the storage/shelf life, the pH values (pH45min, pH24h, pH48h and pH72h) of the longissimus dorsi muscles in F2 individuals of 462 Texel sheep × Altay sheep were determined, genotyping was performed using Illumina Ovine SNP 600 K BeadChip and whole genome resequencing technology, a genome-wide association analysis (GWAS) was used to screen the candidate genes and molecular markers for pH values related to the quality traits of mutton, and the effects of population stratification were detected by Q-Q plots. The results showed that the pH population stratification analysis did not find significant systemic bias, and there was no obvious population stratification effect. The results of the association analysis showed that 28 SNPs significantly associated with pH reached the level of genomic significance. The candidate gene associated with pH45min was identified as the CCDC92 gene by gene annotation and a search of the literature. Candidate genes related to pH24h were KDM4C, TGFB2 and GOT2 genes. The candidate genes related to pH48h were MMP12 and MMP13 genes. The candidate genes related to pH72h were HILPDA and FAT1 genes. Further bioinformatics analyses showed 24 gene ontology terms and five signaling pathways that were significantly enriched (p ≤ 0.05). Many terms and pathways were related to cellular components, processes of protein modification, the activity of protein dimerization and hydrolase activity. These identified SNPs and genes could provide useful information about meat and the storage/shelf life of meat, thereby extending the storage/shelf life and quality of meat.
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Affiliation(s)
- Yilong Zhao
- College of Animal Science and Technology, Shihezi University, Shihezi 832000, China
- College of Animal Science and Technology, Xinjiang Agricultural Vocational and Technical College, Changji 831100, China
| | - Sangang He
- Biotechnology Institute, Xinjiang Academy of Animal Science, Urumqi 830013, China
| | | | - Mingjun Liu
- Biotechnology Institute, Xinjiang Academy of Animal Science, Urumqi 830013, China
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2
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Regulation of yak longissimus lumborum energy metabolism and tenderness by the AMPK/SIRT1 signaling pathways during postmortem storage. PLoS One 2022; 17:e0277410. [PMID: 36441689 PMCID: PMC9704559 DOI: 10.1371/journal.pone.0277410] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Accepted: 10/26/2022] [Indexed: 11/29/2022] Open
Abstract
AMPK can activate nicotinamide phosphoribosyltransferase (NAMPT), increasing the ratio of oxidized nicotinamide adenine dinucleotide (NAD+)/reduced nicotinamide adenine dinucleotide (NADH) ratio, leading to the activation of the energy receptor SIRT1. This pathway is known as the AMPK/SIRT1 signaling pathway. SIRT1 deacetylates and activate LKB1, which is activated by phosphorylation of AMPK (Thr172) and inhibited by phosphorylase-mediated dephosphorylation of AMPK. At the same time, increased AMP/ATP and NAD+/NADH ratios lead to the activation of AMPK and SIRT1. SIRT1 and AMPK can activate each other forming a positive feedback loop, which can strengthen catabolism and weaken anabolism thus maintaining energy homeostasis of energy metabolism. At present, there has been no systematic study on AMPK-associated signaling cascades in stored yak meat and details of the AMPK/SIRT1 signaling under these conditions are not known. In this study, NAD+, NADH were added to yak longissimus thoracic muscles to study AMPK pathway regulation by AMPK/SIRT1 signaling. NAD+ significantly increased the activity of AMPK and glycolysis during postmortem maturation, increased the rate of energy metabolism, and increased the expression of AMPK protein, indicating that NAD+ increased energy metabolism in the stored muscle by promoting AMPK activity. NADH treatment inhibited both AMPK activation and glycolysis, together with increasing the pH in the muscle. The results showed that SIRT1 activation elevated the activity of AMPK, leading to its phosphorylation and the activation of glycolysis. Thus, AMPK activity was found to increase in yak meat as an adaptation to hypoxic conditions. This allows more effective regulation of energy production and improves the tenderness of the meat.
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Luo Y, Ju N, Chang J, Ge R, Zhao Y, Zhang G. Dietary α-lipoic acid supplementation improves postmortem color stability of the lamb muscles through changing muscle fiber types and antioxidative status. Meat Sci 2022; 193:108945. [PMID: 35986989 DOI: 10.1016/j.meatsci.2022.108945] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 07/07/2022] [Accepted: 08/04/2022] [Indexed: 01/08/2023]
Abstract
This study investigated the effect of dietary α-lipoic acid (600 mg/kg) supplementation on the postmortem color stability of the biceps femoris from lambs. The results showed that dietary α-lipoic acid supplementation increased a* and decreased b* and metmyoglobin (MMb) percentage of the biceps femoris with the time of storage (P < 0.05). The content of malondialdehyde (MDA) reduced with the time of storage after treatment with α-lipoic acid (P < 0.05). α-lipoic acid increased the myoglobin (Mb) content, and myosin heavy chain I (MyHC I) gene expression but decreased glycogen content, lactate dehydrogenase (LDH) activity, and MyHC IIb gene expression (P < 0.05). The T-AOC value, catalase (CAT) activity, and expression of SOD and CAT gene expression increased after α-lipoic acid treatment (P < 0.05). Therefore, dietary α-lipoic acid supplementation improved the meat color by regulating muscle fiber types and inhibited glycolysis. Moreover, α-lipoic acid maintained meat color stability by effectively inhibiting muscle oxidation via enhancing the antioxidant capacity.
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Affiliation(s)
- Yulong Luo
- School of Food & Wine, Ningxia University, Yinchuan 750021, PR China
| | - Ning Ju
- School of Food & Wine, Ningxia University, Yinchuan 750021, PR China
| | - Jiang Chang
- School of Food & Wine, Ningxia University, Yinchuan 750021, PR China
| | - Ruixuan Ge
- School of Food & Wine, Ningxia University, Yinchuan 750021, PR China
| | - Yaya Zhao
- School of Food & Wine, Ningxia University, Yinchuan 750021, PR China
| | - Guijie Zhang
- School of Agriculture, Ningxia University, Yinchuan 750021, PR China.
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Yang Y, Han L, Yu Q, Gao Y, Song R. Study of the AMP-Activated Protein Kinase Role in Energy Metabolism Changes during the Postmortem Aging of Yak Longissimus dorsal. Animals (Basel) 2020; 10:E427. [PMID: 32143283 PMCID: PMC7143603 DOI: 10.3390/ani10030427] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 02/21/2020] [Accepted: 03/02/2020] [Indexed: 11/16/2022] Open
Abstract
To explore the postmortem physiological mechanism of muscle, activity of adenosine monophosphate activated protein kinase (AMPK) as well as its role in energy metabolism of postmortem yaks were studied. In this experiment, we injected 5-amino-1-beta-d-furanonyl imidazole-4-formamide (AICAR), a specific activator of AMPK, and STO-609 to observe the changes in glycolysis, energy metabolism, AMPK activity, and AMPK gene expression (PRKA1 and PRKA2) in postmortem yaks during maturation. The results showed that AICAR could increase the expression of the PRKKA1 and PRKAA2 genes, activate AMPK and increase its activity. The effects of AICAR include a lower concentration of ATP, an increase in AMP production, an acceleration of glycolysis, an increase in the lactic acid concentration, and a decrease in the pH value. In contrast, STO-609 had the opposite effect. Under hypoxic adaptation, the activity of the meat AMPK increased, which accelerated glycolysis and metabolism and more effectively regulated energy metabolism. Therefore, this study lays the foundation for establishing a theoretical system of energy metabolism in postmortem yak meat.
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Affiliation(s)
- Yayuan Yang
- College of Food Science and Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China; (Y.Y.); (Q.Y.); (Y.G.)
| | - Ling Han
- College of Food Science and Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China; (Y.Y.); (Q.Y.); (Y.G.)
| | - Qunli Yu
- College of Food Science and Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China; (Y.Y.); (Q.Y.); (Y.G.)
| | - Yongfang Gao
- College of Food Science and Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China; (Y.Y.); (Q.Y.); (Y.G.)
| | - Rende Song
- Qinghai Animal and Veterinary Sciences Work Station, No. 189, Xinjian road, Yushu prefecture, Qinghai 815000, China;
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Xing T, Gao F, Tume RK, Zhou G, Xu X. Stress Effects on Meat Quality: A Mechanistic Perspective. Compr Rev Food Sci Food Saf 2018; 18:380-401. [PMID: 33336942 DOI: 10.1111/1541-4337.12417] [Citation(s) in RCA: 99] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Revised: 10/31/2018] [Accepted: 11/12/2018] [Indexed: 12/16/2022]
Abstract
Stress inevitably occurs from the farm to abattoir in modern livestock husbandry. The effects of stress on the behavioral and physiological status and ultimate meat quality have been well documented. However, reports on the mechanism of stress effects on physiological and biochemical changes and their consequent effects on meat quality attributes have been somewhat disjointed and limited. Furthermore, the causes of variability in meat quality traits among different animal species, muscle fibers within an animal, and even positions within a piece of meat in response to stress are still not entirely clear. This review 1st summarizes the primary stress factors, including heat stress, preslaughter handling stress, oxidative stress, and other stress factors affecting animal welfare; carcass quality; and eating quality. This review further delineates potential stress-induced pathways or mediators, including AMP-activated protein kinase-mediated energy metabolism, crosstalk among calcium signaling pathways and reactive oxygen species, protein modification, apoptosis, calpain and cathepsin proteolytic systems, and heat shock proteins that exert effects that cause biochemical changes during the early postmortem period and affect the subsequent meat quality. To obtain meat of high quality, further studies are needed to unravel the intricate mechanisms involving the aforementioned signaling pathways or mediators and their crosstalk.
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Affiliation(s)
- Tong Xing
- College of Animal Science and Technology, Key Laboratory of Animal Products Processing, Ministry of Agriculture, Key Laboratory of Meat Processing and Quality Control, Ministry of Education, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control, Nanjing Agricultural Univ., Nanjing, 210095, China
| | - Feng Gao
- College of Animal Science and Technology, Key Laboratory of Animal Products Processing, Ministry of Agriculture, Key Laboratory of Meat Processing and Quality Control, Ministry of Education, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control, Nanjing Agricultural Univ., Nanjing, 210095, China
| | - Ronald K Tume
- College of Food Science and Technology, Nanjing Agricultural Univ., Nanjing, 210095, Jiangsu, China
| | - Guanghong Zhou
- College of Food Science and Technology, Nanjing Agricultural Univ., Nanjing, 210095, Jiangsu, China
| | - Xinglian Xu
- College of Food Science and Technology, Nanjing Agricultural Univ., Nanjing, 210095, Jiangsu, China
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6
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Xing T, Zhao X, Wang P, Chen H, Xu X, Zhou G. Different oxidative status and expression of calcium channel components in stress-induced dysfunctional chicken muscle. J Anim Sci 2017; 95:1565-1573. [PMID: 28464077 DOI: 10.2527/jas.2016.0868] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The objective of this study was to assess the effects of transport stress at high ambient temperatures on the oxidation status and the expression of essential elements responsible for the Ca transport (sarco- (endo-) plasmic reticulum Ca-ATPase (SERCA1) and the ryanodine receptor (RyR) in (PM) muscles of broilers. Briefly, Arbor Acres broiler chickens ( = 112) were randomly categorized into 2 treatments: unstressed control (C) and 0.5 h transport (T). Each treatment consisted of 8 replicates of 7 birds each. Birds were transported according to a designed protocol. PM muscle samples in T group were collected and classified as normal (T-NOR) or pale, soft, and exudative-like (T-PSE) using meat quality parameters. The results indicated that production of corticosterone (CORT) and reactive oxygen species (ROS) increased significantly after transportation ( < 0.05). Thiobarbituric acid reactive substance values and carbonyl contents increased significantly in the T group ( < 0.05). Moreover, the extent of lipid peroxidation and protein oxidation was more severe in the T-PSE group compared to the T-NOR group ( < 0.05). The mRNA and protein expression of SERCA1 and αRyR increased in the T-NOR group but decreased significantly in the T-PSE group compared to the CON group ( < 0.05). The mRNA expression of βRyR was found to be enhanced in the T-NOR group compared to the CON group, whereas there was no difference in the T-PSE group ( < 0.05). The results indicate that short-distance transport of broilers affects their physiological responses and biochemical changes which may lead to different oxidative states and, importantly, to different expressions of SERCA and RyR. These induced changes in abnormal sarcoplasmic Ca homeostasis have significant implications for the development of PSE-like meat.
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7
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Sohaib M, Anjum FM, Nasir M, Saeed F, Arshad MS, Hussain S. Alpha-lipoic acid: An inimitable feed supplement for poultry nutrition. J Anim Physiol Anim Nutr (Berl) 2017; 102:33-40. [DOI: 10.1111/jpn.12693] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2015] [Accepted: 01/12/2017] [Indexed: 11/27/2022]
Affiliation(s)
- M. Sohaib
- Department of Food Science and Human Nutrition; University of Veterinary and Animal Sciences; Lahore Pakistan
| | - F. M. Anjum
- Department of Food Science and Human Nutrition; University of Veterinary and Animal Sciences; Lahore Pakistan
| | - M. Nasir
- Department of Food Science and Human Nutrition; University of Veterinary and Animal Sciences; Lahore Pakistan
| | - F. Saeed
- Institute of Home & Food Sciences; Government College University; Faisalabad Pakistan
| | - M. S. Arshad
- Institute of Home & Food Sciences; Government College University; Faisalabad Pakistan
| | - S. Hussain
- Department of Food Science and Nutrition; College of Food and Agricultural Sciences; King Saud University; Riyadh Saudi Arabia
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8
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Wang R, Liang R, Lin H, Zhu L, Zhang Y, Mao Y, Dong PC, Niu L, Zhang M, Luo X. Effect of acute heat stress and slaughter processing on poultry meat quality and postmortem carbohydrate metabolism. Poult Sci 2017; 96:738-746. [DOI: 10.3382/ps/pew329] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2016] [Accepted: 08/07/2016] [Indexed: 11/20/2022] Open
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9
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Guo Z, Li J, Zhang L, Jiang Y, Gao F, Zhou G. Effects of alpha-lipoic acid supplementation in different stages on growth performance, antioxidant capacity and meat quality in broiler chickens. Br Poult Sci 2014; 55:635-43. [DOI: 10.1080/00071668.2014.958057] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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10
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Zhang Y, Jia R, Ji C, Ma Q, Huang J, Yin H, Liu L. Effects of Dietary Alpha-lipoic Acid and Acetyl-L-carnitine on Growth Performance and Meat Quality in Arbor Acres Broilers. ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES 2014; 27:996-1002. [PMID: 25050042 PMCID: PMC4093565 DOI: 10.5713/ajas.2013.13436] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/18/2013] [Revised: 09/22/2013] [Accepted: 01/18/2014] [Indexed: 11/27/2022]
Abstract
An experiment was conducted to evaluate the effects of dietary alpha-lipoic acid (LA) and acetyl-L-carnitine (ALC) on growth performance, carcass characteristics and meat quality in Arbor Acres broilers. A total of 486 1-d-old male Arbor Acres broilers were randomly allocated to 9 dietary treatments, 9 treatments were group A (0 mg/kg LA and 0 mg/kg ALC), group B (50 mg/kg LA and 0 mg/kg ALC), group C (100 mg/kg LA and 0 mg/kg ALC), group D (0 mg/kg LA and 50 mg/kg ALC), group E (50 mg/kg LA and 50 mg/kg ALC), group F (100 mg/kg LA and 50 mg/kg ALC), group G (0 mg/kg LA and 100 mg/kg ALC), group H (50 mg/kg LA and 100 mg/kg ALC), group I (100 mg/kg LA and 100 mg/kg ALC). Birds were slaughtered at 42 days old. Average daily gain (ADG), average feed intake (AFI), feed conversion rate (FCR), eviscerated rate, breast muscle percentage, thigh muscle percentage, abdominal fat percentage, liver weight, muscle color (L* value, a* value, b* value), pH values at 45 min and 24 h postmortem were measured. Results showed that there existed an interaction between LA and ALC in growth performance of broilers, carcass traits and meat quality. The overall result is that high level of LA and ALC led to lower AFI, ADG (p<0.01), lower abdominal fat percentage, liver weight (p<0.01), lower L* value, a* value, and b* value of breast muscle, L* value of thigh muscle (p<0.05), and higher FCR (p<0.01), eviscerated rate (p<0.01), breast muscle percentage, thigh muscle percentage (p<0.05), a* value, pH 45 min and pH 24 h of thigh muscle (p<0.01). These results suggested that dietary LA and ALC contributed to the improvement of meat quality in broilers.
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Affiliation(s)
- Yong Zhang
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China ; College of Biological Engineering, Henan University of Technology, Zhengzhou, 450001, China
| | - Ru Jia
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China
| | - Cheng Ji
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China
| | - Qiugang Ma
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China
| | - Jin Huang
- College of Biological Engineering, Henan University of Technology, Zhengzhou, 450001, China
| | - Haicheng Yin
- College of Biological Engineering, Henan University of Technology, Zhengzhou, 450001, China
| | - Laiting Liu
- College of Biological Engineering, Henan University of Technology, Zhengzhou, 450001, China
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AMP-activated protein kinase (AMPK) α2 subunit mediates glycolysis in postmortem skeletal muscle. Meat Sci 2013; 95:536-41. [DOI: 10.1016/j.meatsci.2013.05.025] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Revised: 05/13/2013] [Accepted: 05/20/2013] [Indexed: 11/22/2022]
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12
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High early post-mortem temperature induces activation of AMP-activated protein kinase and development of pale, soft and exudative characteristics in turkey muscles. Meat Sci 2013; 93:600-6. [DOI: 10.1016/j.meatsci.2012.11.011] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2012] [Revised: 08/13/2012] [Accepted: 11/10/2012] [Indexed: 11/17/2022]
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13
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Yasin M, Asghar A, Anjum F, Butt M, Khan M, Arshad M, Shahid M, El-Ghorab A, Shibamoto T. Oxidative stability enhancement of broiler bird meats with α-lipoic acid and α-tocopherol acetate supplemented feed. Food Chem 2012. [DOI: 10.1016/j.foodchem.2011.09.031] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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Betti M, Schneider B, Wismer W, Carney V, Zuidhof M, Renema R. Omega-3-enriched broiler meat: 2. Functional properties, oxidative stability, and consumer acceptance. Poult Sci 2009; 88:1085-95. [DOI: 10.3382/ps.2008-00158] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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15
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AMP-activated protein kinase is negatively associated with intramuscular fat content in longissimus dorsi muscle of beef cattle. Meat Sci 2008; 79:394-402. [DOI: 10.1016/j.meatsci.2007.10.025] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2007] [Revised: 10/16/2007] [Accepted: 10/18/2007] [Indexed: 11/18/2022]
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16
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Shen QW, Gerrard DE, Du M. Compound C, an inhibitor of AMP-activated protein kinase, inhibits glycolysis in mouse longissimus dorsi postmortem. Meat Sci 2008; 78:323-30. [DOI: 10.1016/j.meatsci.2007.06.023] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2007] [Revised: 06/24/2007] [Accepted: 06/26/2007] [Indexed: 02/07/2023]
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17
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Shen QW, Zhu MJ, Tong J, Ren J, Du M. Ca2+/calmodulin-dependent protein kinase kinase is involved in AMP-activated protein kinase activation by alpha-lipoic acid in C2C12 myotubes. Am J Physiol Cell Physiol 2007; 293:C1395-403. [PMID: 17687000 DOI: 10.1152/ajpcell.00115.2007] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
alpha-Lipoic acid (ALA) widely exists in foods and is an antidiabetic agent. ALA stimulates glucose uptake and increases insulin sensitivity by the activation of AMP-activated protein kinase (AMPK) in skeletal muscle, but the underlying mechanism for AMPK activation is unknown. Here, we investigated the mechanism through which ALA activates AMPK in C2C12 myotubes. Incubation of C2C12 myotubes with 200 and 500 microM ALA increased the activity and phosphorylation of the AMPK alpha-subunit at Thr(172). Phosphorylation of the AMPK substrate, acetyl CoA carboxylase (ACC), at Ser(79) was also increased. No difference in ATP, AMP, and the calculated AMP-to-ATP ratio was observed among the different treatment groups. Since the upstream AMPK kinase, LKB1, requires an alteration of the AMP-to-ATP ratio to activate AMPK, this data showed that LKB1 might not be involved in the activation of AMPK induced by ALA. Treatment of ALA increased the intracellular Ca(2+) concentration measured by fura-2 fluorescent microscopy (P < 0.05), showing that ALA may activate AMPK through enhancing Ca(2+)/calmodulin-dependent protein kinase kinase (CaMKK) signaling. Indeed, chelation of intracellular free Ca(2+) by loading cells with 25 microM BAPTA-AM for 30 min abolished the ALA-induced activation of AMPK and, in turn, phosphorylation of ACC at Ser(79). Furthermore, inhibition of CaMKK using its selective inhibitor, STO-609, abolished ALA-stimulated AMPK activation, with an accompanied reduction of ACC phosphorylation at Ser(79). In addition, ALA treatment increased the association of AMPK with CaMKK. To further show the role of CaMKK in AMPK activation, short interfering RNA was used to silence CaMKK, which abolished the ALA-induced AMPK activation. These data show that CaMKK is the kinase responsible for ALA-induced AMPK activation in C2C12 myotubes.
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Affiliation(s)
- Qingwu W Shen
- Department of Animal Science, Interdepartmental Molecular and Cellular Life Science Program, University of Wyoming, Laramie, WY 82071, USA
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18
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Shen QW, Underwood KR, Means WJ, McCormick RJ, Du M. The halothane gene, energy metabolism, adenosine monophosphate-activated protein kinase, and glycolysis in postmortem pig longissimus dorsi muscle1. J Anim Sci 2007; 85:1054-61. [PMID: 17202397 DOI: 10.2527/jas.2006-114] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The presence of the halothane gene results in PSE meat. However, the exact mechanisms linking the halothane gene and the incidence of PSE meat remain unclear. We hypothesize that the presence of the halothane gene accelerates energy consumption in postmortem muscle, which activates adenosine monophosphate-activated protein kinase (AMPK), leading to enhanced glycolysis and PSE meat. To test our hypothesis, energy status, AMPK activity, and glycolysis in the postmortem LM of the halothane gene carrier and halothane-negative pigs were compared. The results showed that the presence of the halothane gene accelerated energy depletion in postmortem muscle immediately after exsanguination, leading to rapid and early depletion of ATP, as shown by an increase in the (adenosine monophosphate + inosine monophosphate):ATP ratio in postmortem LM. In addition, an early AMPK activation was observed in LM from halothane carriers. The fructose-2,6-diphosphate concentration in postmortem LM was well correlated with AMPK activation. To be a potent stimulator of phosphofructose kinase, the increase in fructose-2,6-diphosphate is expected to activate phosphofructose kinase, a key enzyme controlling glycolysis, leading to enhanced glycolysis and early accumulation of lactic acid. In summary, this study showed that the presence of the halothane gene induced early energy depletion, which could be a primary reason causing AMPK activation, leading to accelerated glycolysis and an increased incidence of PSE meat. However, AMPK might also be activated by other mechanisms besides energy depletion, which warrants further studies.
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Affiliation(s)
- Q W Shen
- Department of Animal Science, University of Wyoming, Laramie 82071, USA
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19
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Pre-slaughter transport, AMP-activated protein kinase, glycolysis, and quality of pork loin. Meat Sci 2006; 74:388-95. [DOI: 10.1016/j.meatsci.2006.04.007] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2006] [Revised: 04/08/2006] [Accepted: 04/10/2006] [Indexed: 11/18/2022]
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20
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Shen QW, Jones CS, Kalchayanand N, Zhu MJ, Du M. Effect of dietary α-lipoic acid on growth, body composition, muscle pH, and AMP-activated protein kinase phosphorylation in mice1. J Anim Sci 2005; 83:2611-7. [PMID: 16230659 DOI: 10.2527/2005.83112611x] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The effects of alpha-lipoic acid (ALA) on the growth, body composition, postmortem AMP-activated protein kinase (AMPK) activation, and 24-h muscle pH were investigated. Thirty male C57BL/6J mice were fed diets containing 0, 0.5, or 1.0% ALA (DM basis). At the end of the 3-wk feeding trial, carcass weights decreased (P < 0.05) 14 and 30% for mice fed 0.5 and 1.0% ALA, respectively, compared with the 0% group, with decreases in BW as the levels of dietary ALA increased. This change in carcass weight occurred because carcass fat content for mice receiving 0.5 and 1.0% ALA was 7.32 and 8.09% lower (P < 0.05), respectively, than for the 0% ALA treatment, and because gonadal fat decreased (P < 0.05) 85% in mice fed 1.0% ALA compared with those fed 0% ALA. Dietary ALA caused a slight increase (P < 0.05) in carcass moisture content, with no (P = 0.07) effect on protein and ash content. Furthermore, ALA supplement decreased (P < 0.05) ADFI (DM basis) from 4.3 g/d for 0% ALA-fed mice to 3.4 g/d for 1.0% ALA-fed mice. At 20 min postmortem, pH was greater (P < 0.05) in muscle of mice fed 1.0% ALA than in muscle of mice fed 0% ALA. Ultimate (24-h) pH values differed (P < 0.05) among treatments, and mean values were 5.83, 6.08, and 6.29 for 0, 0.5, and 1.0% ALA, respectively. Phosphorylation of AMPK alpha subunit at Thr172, an indicator of AMPK activation, was decreased (P < 0.05) in muscle of ALA-treated mice at 20 min postmortem. Because AMPK has a crucial role in the control of glycolysis, the reduction in AMPK activation decreases glycolysis, and thereby increases the ultimate pH of postmortem muscle. In summary, dietary ALA supplement can decrease fat accumulation in mice, and because ALA increased muscle pH at 20 min and 24 h postmortem, these results suggest that dietary ALA supplementation might decrease carcass fatness and prevent the development of PSE pork and poultry. However, further research is required to test the effects of ALA in swine and poultry.
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Affiliation(s)
- Q W Shen
- Department of Animal Science, University of Wyoming, Laramie, 82071, USA
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