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Regulation of protein degradation pathways by amino acids and insulin in skeletal muscle of neonatal pigs

Journal of Animal Science and Biotechnology 2014年第3期5卷 299-309页

作者： Agus Suryawan teresa a davis United States Department of Agriculture/Agricultural Research Service Children's Nutrition Research Center Department of PediatricsBaylor College of Medicine

Background： The rapid gain in lean mass in neonates requires greater rates of protein synthesis than degradation. We previously delineated the molecular mechanisms by which insulin and amino acids, especially leucine, modulate skeletal muscle protein synthesis and how this changes with development. In the current study, we identified mechanisms involved in protein degradation regulation. In experiment 1,6- and 26-d-old pigs were studied during 1） euinsulinemic-euglycemic-euaminoacidemic, 2） euinsulinemic-euglycemiohyperaminoacidemic, and 3） hyperinsulinemic-euglycemic-euaminoacidemic clamps for 2 h. In experiment 2, 5-d-old pigs were studied during 1） euinsulinemic-euglycemic-euaminoacidemic-euleucinemic, 2） euinsulinemic-euglycemic-hypoaminoacidemic- hyperleucinemic, and 3） euinsulinemic-euglycemic-euaminoacidemic-hyperleucinemic clamps for 24 h. We determined in muscle indices of ubiquitin-proteasome, i.e., atrogin-1 （MAFbx） and muscle RING-finger protein-1 （MuRF1） and autophagy-lysosome systems, i.e., unc51-1ike kinase 1 （UKL1）, microtubule-associated protein light chain 3 （LC3）, and lysosomal-associated membrane protein 2 （Lamp-2）. For comparison, we measured ribosomal protein 56 （rpS6） and eukaryotic initiation factor 4E （elF4E） activation, components of translation initiation. Results： Abundance of atrogin-1, but not MuRF1, was greater in 26- than 6-d-old pigs and was not affected by insulin, amino acids, or leucine. Abundance of ULK1 and LC3 was higher in younger pigs and not affected by treatment. The LC3-11/LC3-1 ratio was reduced and ULK1 phosphorylation increased by insulin, amino acids, and leucine. These responses were more profound in younger pigs. Abundance of Lamp-2 was not affected by treatment or development. Abundance of elF4E, but not rpS6, was higher in 6- than 26-d-old-pigs but unaffected by treatment. Phosphorylation of elF4E was not affected by treatment, however, insulin, amino acids, and leucine stimulated rpS6 phosphorylation, and the resp

关键词： Amino acids Autophagy Insulin Leucine Muscle Neonate Protein degradation Protein synthesis,Swine Ubiquitin

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Differential regulation of protein synthesis in skeletal muscle and liver of neonatal pigs by leucine through an mTORC1-dependent pathway

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Journal of Animal Science and Biotechnology 2012年第1期3卷 32-41页

作者： Agus Suryawan Hanh V Nguyen Rosemarie D Almonaci teresa a davis Department of Pediatrics Baylor College of Medicine United States Department of Agriculture/Agriculture Research Service Children's Nutrition Research Center 1100 Bates Street Houston TX 77030 USA

Neonatal growth is characterized by a high protein synthesis rate that is largely due to an enhanced sensitivity to the postprandial rise in insulin and amino acids, especially leucine. The mechanism of leucine＇s action in vivo is not well understood. In this study, we investigated the effect of leucine infusion on protein synthesis in skeletal muscle and liver of neonatal pigs. To evaluate the mode of action of leucine, we used rapamycin, an inhibitor of mammalian target of rapamycin （mTOR） complex-1 （mTORC1）. Overnight-fasted 7-day-old piglets were treated with rapamycin for 1 hour and then infused with leucine （400 μmol·kg^-1·h^-1） for 1 hour. Leucine infusion increased the rate of protein synthesis, and ribosomal protein S6 kinase 1 （S6K1） and eukaryotic initiation factor （elF） 4E-binding protein-1 （4E-BP1） phosphorylation in gastrocnemius and masseter muscles （P 〈 0.05）, but not in the liver. The leucine-induced stimulation of protein synthesis and S6K1 and 4E-BP1 phosphorylation were completely blocked by rapamycin, suggesting that leucine action is by an mTORC1-dependent mechanism. Neither leucine nor rapamycin had any effect on the activation of the upstream mTQRC1 regulators, AMP-activated protein kinase and protein kinase B, in skeletal muscle or liver. The activation of elF2α and elongation factor 2 was not affected by leucine or rapamycin, indicating that these two pathways are not limiting steps of leucine-induced protein synthesis. These results suggest that leucine stimulates muscle protein synthesis in neonatal pigs by inducing the activation of mTORC1 and its downstream pathway leading to mRNA translation.

关键词： leucine mTORC1 neonatal pigs rapamycin skeletal muscle

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Amino Acids and Insulin Are Critical Regulators of Muscle Protein Synthesis in Neonatal Pigs

Amino Acids and Insulin Are Critical Regulators of Muscle Pr...

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2007年动物营养、保健与饲料添加剂国际学术研讨会

作者： teresa A.davis USDA/ARS Children's Nutrition Research Center Baylor College of Medicine Houston

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Diversity and host assemblage of avian haemosporidians in different terrestrial ecoregions of Peru

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Current Zoology 2022年第1期68卷 27-40页

作者： Luz GARCIA-LONGORIA Jaime MURIEL Sergio MAGALLANES Zaira Hellen VILLA-GALARCE Leonila RICOPA Wilson Giancarlo INGA-DIAZ Esteban FONG Daniel VECCO Cesar GUERRA-SALDANA teresa SALAS-RENGIFO Wendy FLORES-SAAVEDRA Kathya ESPINOZA Carlos MENDOZA Blanca SALDANA Manuel GONZALEZ-BLAZQUEZ Henry GONZALES-PINEDO Charlene LUJAN-VEGA Carlos Alberto Del AGUILA Yessica VILCA-HERRERA Carlos Alberto PINEDA Carmen REATEGUI Jorge Manuel CARDENAS-CALLIRGOS JoseAlberto IANNACONE Jorge Luis MENDOZA Ravinder NMSEHGAL Alfonso MARZAL Departamento de Anatomia Biologia Celular y ZoologiaUniversidad de ExtremaduraBadajoz E-506071Spain Molecular Ecology and Evolution Lab Department of BiologyLund UniversitySolvegatan 37SE-22362 LundSweden Instituto Pirenaico de Ecologıa-IPE(CSIC) Avda.Nuestra Senora de la Victoria 16Jaca 22700Spain DIRESA Direccion Regional de SaludLoreto 16001Peru Departamento Academico de Microbiologia y Parasitologia.Facultad de Ciencias Biologicas Universidad Nacional de la Amazonia PeruanaIquitos 16001Peru Facultad de Ciencias Agropecuarias Universidad Alas PeruanasLima 15823Peru EverGreen Institute-San Rafael Distrito de IndianaLoreto 16200Peru Observatorio de Aves Loreto(LBO) Distrito de San JuanLoreto 16008Peru Centro Urku de Estudios Amazonicos Tarapoto 22200Peru Servicio Nacional de Areas Naturales Protegidas por el Estado 15036Peru Sanidad Animal-Facultad de Zootecnia Universidad Nacional Agraria La MolinaLima 15012Peru Laboratorio de Microbiologia Facultad de Medicina Veterinaria y ZootecniaUniversidad CientUfica del SurLima 15067Peru Laboratorio de Analisis Clinico Moraleslab SAC MoralesSan Martin 22201Peru Asociacion Ecosistemas Andinos(ECOAN) Cuzco 08002Peru Pharmacology and Toxicology Graduate Group University of CaliforniaDavisDA 95616USA Global Health Initiative Wabash CollegeCrawfordsvilleIN 47933USA Facultad de Ciencias Biologicas Universidad Nacional Mayor de San MarcosLima 15081Peru Facultad de Medicina Veterinaria Universidad Nacional Hermilio ValdizanHuanuco10160Peru Asociacion Peruana de Helmintologia e Invertebrados Afines Lima 15054Peru Laboratorio de Ecologia y Biodiversidad Animal Universidad Nacional Federico VillarrealEl AgustinoLima 15007Peru Laboratorio de Invertebrados Universidad Ricardo Palma-Santiago de SurcoLima 15537Peru Department of Biology San Francisco State UniversitySan FranciscoCA 94132USA

Characterizing the diversity and structure of host–parasite communities is crucial to understandingtheir eco-evolutionary *** and related haemosporidian parasites are responsible forfitness loss and mortality in bird species ***,despite exhibiting the greatest ornithologicalbiodiversity,avian haemosporidians from Neotropical regions are quite ***,we analyze the genetic diversity of bird haemosporidian parasites(Plasmodium andHaemoproteus)in 1,336 individuals belonging to 206 bird species to explore for differences in diversityof parasite lineages and bird species across 5 well-differentiated Peruvian *** 70 different haemosporidian lineages infecting 74 bird *** showed that 25 out ofthe 70 haplotypes had not been previously ***,we also identified 81 new host–parasite interactions representing new host records for these haemosporidian *** outcomesrevealed that the effective diversity(as well as the richness,abundance,and Shannon–Weaver index)for both birds and parasite lineages was higher in Amazon basin ***,we also showed that ecoregions with greater diversity of bird species also had highparasite richness,hence suggesting that host community is crucial in explaining parasite *** parasites were found in ecoregions with lower bird diversity,implying that the abundanceand richness of hosts may shape the exploitation strategy followed by haemosporidian *** outcomes reveal that Neotropical region is a major reservoir of unidentified *** studies analyzing host distribution and specificity of these parasites inthe tropics will provide important knowledge about phylogenetic relationships,phylogeography,and patterns of evolution and distribution of haemosporidian parasites.

关键词： Amazonia avian malaria generalist parasite habitat specificity Haemoproteus Plasmodium specialist parasite

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Ventilation practices in burn patients—an international prospective observational cohort study

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Burns & Trauma 2021年第1期9卷 47-57页

作者： Gerie J.Glas Janneke Horn Markus W.Hollmann Benedikt Preckel Kirsten Colpaert Manu Malbrain Ary Serpa Neto Karim Asehnoune Marcello Gamma de Abreu Ignacio Martin-Loeches Paolo Pelosi Folke Sjoerg Jan M.Binnekade Berry Cleffken Nicole P.Juffermans Paul Knape Bert G.Loef David P.Mackie Perenlei Enkhbaatar Nadia Depetris Anders Perner Eva Herrero Lucia Cachafeiro Marc Jeschke Jeffrey Lipman Matthieu Legrand Johannes Horter Athina Lavrentieva Alex Kazemi Anne Berit Guttormsen Frederik Huss Mark Kol Helen Wong Therese Starr Luc De Crop Wilson de Oliveira Filho Joa Manoel Silva Junior Cintia M.C.Grion Marjorie Burnett Frederik Mondrup Francois Ravat Mathieu Fontaine Renan Le Floch Mathieu Jeanne Morgane Bacus Maite Chaussard Marcus Lehnhardt Bassem Daniel Mikhail Jochen Gille Aidan Sharkey Nicole Trommel Auke C.Reidinga Nadine Vieleers Anna Tilsley Henning Onarheim Maria teresa Bouza Alexander Agrifoglio Filip Fredén Tina Palmieri Lynda E.Painting Marcus J.Schultz LAMiNAR investigators Academic Medical Center University of AmsterdamAmsterdamAZ 1105The Netherlands Department of Anaesthesia and Intensive Therapy Medical University of Lublin Aleje Racklawickie 1–20-059 Lublin–Poland AZ JAN PALFIJN GENT Watersportlaan 5–9000 Gent–Belgium ABC Medical School SaPauloBangúSP 5001Brazil Service d’Anesthésie Réanimation Chirurgicale Nantes 44093France University Hospital Carl Gustav Carus Dresden 01307Germany St James University Hospital Dublin D08 NHY1Ireland University of Genoa GenoaGE 16128Italy Linkoing University Hospital Linkoing 58185Sweden Maasstad Hospital RotterdamDZ 3079The Netherlands Red Cross Hospital BeverwijkLE 1942The Netherlands Martini Hospital GroningenNT 9728The Netherlands University of Texas Medical Branch GalvestonTX 77555USA Turin CTO Burn Center TurinTO 10126Italy Rigshospitalet Copenhagen 2100Denmark La Paz University Hospital Madrid 28046Spain Ross Tilley Burn Centre Sunnybrook Health Sciences CentreToronto M4N 3M5Canada Royal Brisbane and Women’s Hospital Queensland UniversityHerstonQLD 4029Australia Australian and New Zealand Intensive Care Research Centre.Monash University MelbourneVIC 3004Australia GH St-Louis-Lariboisière APHPParis 75010France BG Klinik Ludwigshafen Ludwigshafen 67071Germany Papanikoalou Hospital Thessaloniki 54621Greece Middlemore Hospital OtahuhuAuckland 2025New Zealand Haukeland University Hospital Bergen 5021Norway Uppsala University Hospital Uppsala 75185Sweden Concord Repatriation General Hospital NSW University of SydneyConcord 2139Australia Ziekenhuis Netwerk Antwerpen-Stuivenberg Antwerpen 2060Belgium Universidade de Sao Paulo Sao Paulo 01246-903Brazil Universidade Estadual de Londrina Londrina 86057-970Brazil Sunnybrook Health Sciences Centre Toronto M4N 3M5Canada CHU Lyon St Luc Lyon 69007France CHU Nantes Service dánesthesie reanimation chirugicale Nantes 44093France Hopital Roger Salengro CHRU LilleLille 59037France Saint-Louis Hospital Paris 75010France BG University Hospital Bergmannsheil Bo

Background:It is unknown whether lung-protective ventilation is applied in burn patients and whether they benefit from *** study aimed to determine ventilation practices in burn intensive care units(ICUs)and investigate the association between lung-protective ventilation and the number of ventilator-free days and alive at day 28(VFD-28).Methods:This is an international prospective observational cohort study including adult burn patients requiring mechanical *** tidal volume(V_(T))was defined as V_(T)≤8 mL/kg predicted body weight(PBW).Levels of positive end-expiratory pressure(PEEP)and maximum airway pressures were *** association between V_(T) and VFD-28 was analyzed using a competing risk *** settings were presented for all patients,focusing on the first day of *** also compared ventilation settings between patients with and without inhalation ***:A total of 160 patients from 28 ICUs in 16 countries were *** V_(T) was used in 74%of patients,median V_(T) size was 7.3[interquartile range(IQR)6.2–8.3]mL/kg PBW and did not differ between patients with and without inhalation trauma(p=0.58).Median VFD-28 was 17(IQR 0–26),without a difference between ventilation with low or high V_(T)(p=0.98).All patients were ventilated with PEEP levels≥5 cmH_(2)O;80%of patients had maximum airway pressures<30 cmH_(2)***:In this international cohort study we found that lung-protective ventilation is used in the majority of burn patients,irrespective of the presence of inhalation *** of low V_(T) was not associated with a reduction in *** registration:*** *** of registration:9 December 2014.

关键词： Mechanical ventilation Inhalation trauma Lung-protective Critical care

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