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Almeida KV, Santos GT, Daniel JLP, Osorio JAC, Yamada KLG, Sippert MR, Cabral JF, Marchi FE, Araujo RC, Vyas D. Effects of calcium ammonium nitrate fed to dairy cows on nutrient intake and digestibility, milk quality, microbial protein synthesis, and ruminal fermentation parameters. J Dairy Sci 2022; 105:2228-2241. [PMID: 34998571 DOI: 10.3168/jds.2021-21124] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Accepted: 11/20/2021] [Indexed: 11/19/2022]
Abstract
We evaluated the effects of supplemental calcium ammonium nitrate (CAN) fed to dairy cows on dry matter (DM) intake, nutrient digestibility, milk quality, microbial protein synthesis, and ruminal fermentation. Six multiparous Holstein cows at 106 ± 14.8 d in milk, with 551 ± 21.8 kg of body weight were used in a replicated 3 × 3 Latin square design. Experimental period lasted 21 d, with 14 d for an adaptation phase and 7 d for sampling and data collection. Cows were randomly assigned to receive the following treatments: URE, 12 g of urea/kg of DM as a control group; CAN15, 15 g of CAN/kg of DM; and CAN30, 30 g of CAN/kg of DM. Supplemental CAN reduced DM intake (URE 19.0 vs. CAN15 18.9 vs. CAN30 16.5 kg/d). No treatment effects were observed for apparent digestibility of DM, organic matter, crude protein, ether extract, and neutral detergent fiber; however, CAN supplementation linearly increased nonfiber carbohydrate digestibility. Milk yield was not affected by treatments (average = 23.1 kg/d), whereas energy-corrected milk (ECM) and 3.5% fat-corrected milk (FCM) decreased as the levels of CAN increased. Nitrate residue in milk increased linearly (URE 0.30 vs. CAN15 0.33 vs. CAN30 0.38 mg/L); however, treatments did not affect nitrite concentration (average: 0.042 mg/L). Milk fat concentration was decreased (URE 3.39 vs. CAN15 3.35 vs. CAN30 2.94%), and the proportion of saturated fatty acids was suppressed by CAN supplementation. No treatment effects were observed on the reducing power and thiobarbituric acid reactive substances of milk, whereas conjugated dienes increased linearly (URE 47.6 vs. CAN15 52.7 vs. CAN30 63.4 mmol/g of fat) with CAN supplementation. Treatments had no effect on microbial protein synthesis; however, molar proportion of ruminal acetate and acetate-to-propionate ratio increased with CAN supplementation. Based on the results observed, supplementing CAN at 30 g/kg of DM should not be recommended as an optimal dose because it lowered DM intake along with ECM and 3.5% FCM, although no major changes were observed on milk quality and ruminal fermentation.
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Affiliation(s)
- K V Almeida
- Department of Animal Sciences, State University of Maringa, Maringa, Brazil 87020-900; Department of Agriculture, Nutrition, and Food Systems, University of New Hampshire, Durham 03824
| | - G T Santos
- Department of Animal Sciences, State University of Maringa, Maringa, Brazil 87020-900
| | - J L P Daniel
- Department of Animal Sciences, State University of Maringa, Maringa, Brazil 87020-900
| | - J A C Osorio
- Department of Animal Sciences, State University of Maringa, Maringa, Brazil 87020-900
| | - K L G Yamada
- Department of Animal Sciences, State University of Maringa, Maringa, Brazil 87020-900
| | - M R Sippert
- Department of Animal Sciences, State University of Maringa, Maringa, Brazil 87020-900
| | - J F Cabral
- Department of Animal Sciences, State University of Maringa, Maringa, Brazil 87020-900
| | - F E Marchi
- Department of Animal Sciences, State University of Maringa, Maringa, Brazil 87020-900
| | - R C Araujo
- GRASP Ind. & Com. Ltda., Curitiba, Brazil 81260-000
| | - D Vyas
- Department of Animal Sciences, University of Florida, Gainesville 32611.
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Arab JP, Díaz LA, Baeza N, Idalsoaga F, Fuentes-López E, Arnold J, Ramírez CA, Morales-Arraez D, Ventura-Cots M, Alvarado-Tapias E, Zhang W, Clark V, Simonetto D, Ahn JC, Buryska S, Mehta TI, Stefanescu H, Horhat A, Bumbu A, Dunn W, Attar B, Agrawal R, Haque ZS, Majeed M, Cabezas J, García-Carrera I, Parker R, Cuyàs B, Poca M, Soriano G, Sarin SK, Maiwall R, Jalal PK, Abdulsada S, Higuera-de la Tijera MF, Kulkarni AV, Rao PN, Guerra Salazar P, Skladaný L, Bystrianska N, Prado V, Clemente-Sanchez A, Rincón D, Haider T, Chacko KR, Cairo F, de Sousa Coelho M, Romero GA, Pollarsky FD, Restrepo JC, Castro-Sanchez S, Toro LG, Yaquich P, Mendizabal M, Garrido ML, Narvaez A, Bessone F, Marcelo JS, Piombino D, Dirchwolf M, Arancibia JP, Altamirano J, Kim W, Araujo RC, Duarte-Rojo A, Vargas V, Rautou PE, Issoufaly T, Zamarripa F, Torre A, Lucey MR, Mathurin P, Louvet A, García-Tsao G, González JA, Verna E, Brown RS, Roblero JP, Abraldes JG, Arrese M, Shah VH, Kamath PS, Singal AK, Bataller R. Identification of optimal therapeutic window for steroid use in severe alcohol-associated hepatitis: A worldwide study. J Hepatol 2021; 75:1026-1033. [PMID: 34166722 DOI: 10.1016/j.jhep.2021.06.019] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 05/18/2021] [Accepted: 06/03/2021] [Indexed: 12/12/2022]
Abstract
BACKGROUND & AIMS Corticosteroids are the only effective therapy for severe alcohol-associated hepatitis (AH), defined by a model for end-stage liver disease (MELD) score >20. However, there are patients who may be too sick to benefit from therapy. Herein, we aimed to identify the range of MELD scores within which steroids are effective for AH. METHODS We performed a retrospective, international multicenter cohort study across 4 continents, including 3,380 adults with a clinical and/or histological diagnosis of AH. The main outcome was mortality at 30 days. We used a discrete-time survival analysis model, and MELD cut-offs were established using the transform-the-endpoints method. RESULTS In our cohort, median age was 49 (40-56) years, 76.5% were male, and 79% had underlying cirrhosis. Median MELD at admission was 24 (19-29). Survival was 88% (87-89) at 30 days, 77% (76-78) at 90 days, and 72% (72-74) at 180 days. A total of 1,225 patients received corticosteroids. In an adjusted-survival-model, corticosteroid use decreased 30-day mortality by 41% (hazard ratio [HR] 0.59; 0.47-0.74; p <0.001). Steroids only improved survival in patients with MELD scores between 21 (HR 0.61; 0.39-0.95; p = 0.027) and 51 (HR 0.72; 0.52-0.99; p = 0.041). The maximum effect of corticosteroid treatment (21-30% survival benefit) was observed with MELD scores between 25 (HR 0.58; 0.42-0.77; p <0.001) and 39 (HR 0.57; 0.41-0.79; p <0.001). No corticosteroid benefit was seen in patients with MELD >51. The type of corticosteroids used (prednisone, prednisolone, or methylprednisolone) was not associated with survival benefit (p = 0.247). CONCLUSION Corticosteroids improve 30-day survival only among patients with severe AH, especially with MELD scores between 25 and 39. LAY SUMMARY Alcohol-associated hepatitis is a condition where the liver is severely inflamed as a result of excess alcohol use. It is associated with high mortality and it is not clear whether the most commonly used treatments (corticosteroids) are effective, particularly in patients with very severe liver disease. In this worldwide study, the use of corticosteroids was associated with increased 30-day, but not 90- or 180-day, survival. The maximal benefit was observed in patients with an MELD score (a marker of severity of liver disease; higher scores signify worse disease) between 25-39. However, this benefit was lost in patients with the most severe liver disease (MELD score higher than 51).
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Affiliation(s)
- Juan Pablo Arab
- Department of Gastroenterology, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile.
| | - Luis Antonio Díaz
- Department of Gastroenterology, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Natalia Baeza
- Department of Gastroenterology, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Francisco Idalsoaga
- Department of Gastroenterology, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Eduardo Fuentes-López
- Department of Health Sciences, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Jorge Arnold
- Department of Gastroenterology, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile; Servicio Medicina Interna, Hospital El Pino, Santiago, Chile
| | | | - Dalia Morales-Arraez
- Center for Liver Diseases, Division of Gastroenterology, Hepatology and Nutrition, University of Pittsburgh Medical Center, PA, USA
| | - Meritxell Ventura-Cots
- Center for Liver Diseases, Division of Gastroenterology, Hepatology and Nutrition, University of Pittsburgh Medical Center, PA, USA
| | - Edilmar Alvarado-Tapias
- Center for Liver Diseases, Division of Gastroenterology, Hepatology and Nutrition, University of Pittsburgh Medical Center, PA, USA
| | - Wei Zhang
- Division of Gastroenterology and Hepatology, University of Florida, Gainesville, FL, USA
| | - Virginia Clark
- Division of Gastroenterology and Hepatology, University of Florida, Gainesville, FL, USA
| | - Douglas Simonetto
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - Joseph C Ahn
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - Seth Buryska
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - Tej I Mehta
- Division of Gastroenterology and Hepatology, Department of Medicine, University of South Dakota Sanford School of Medicine, Sioux Falls, SD, USA; The Johns Hopkins Hospital, Department of Interventional Radiology, Baltimore, MD, USA
| | - Horia Stefanescu
- Regional Institute of Gastroenterology and Hepatology, Cluj-Napoca, Romania
| | - Adelina Horhat
- Regional Institute of Gastroenterology and Hepatology, Cluj-Napoca, Romania
| | - Andreea Bumbu
- Regional Institute of Gastroenterology and Hepatology, Cluj-Napoca, Romania
| | | | - Bashar Attar
- Division of Gastroenterology & Hepatology, Cook County Health and Hospital Systems, Chicago, Illinois, USA
| | - Rohit Agrawal
- Division of Gastroenterology and Hepatology, University of Illinois, Chicago, Illinois, USA
| | - Zohaib Syed Haque
- Division of Gastroenterology & Hepatology, Cook County Health and Hospital Systems, Chicago, Illinois, USA
| | - Muhammad Majeed
- Division of Gastroenterology & Hepatology, Cook County Health and Hospital Systems, Chicago, Illinois, USA
| | - Joaquín Cabezas
- Gastroenterology and Hepatology Department, University Hospital Marques de Valdecilla, Santander, Spain; Research Institute Valdecilla (IDIVAL), Santander, Spain
| | - Inés García-Carrera
- Gastroenterology and Hepatology Department, University Hospital Marques de Valdecilla, Santander, Spain; Research Institute Valdecilla (IDIVAL), Santander, Spain
| | - Richard Parker
- Leeds Liver Unit, St James's University Hospital, Leeds Teaching Hospitals NHS Trust, Leeds, UK
| | - Berta Cuyàs
- Department of Gastroenterology, Hospital de la Santa Creu i Sant Pau, CIBERehd, Barcelona, Spain
| | - Maria Poca
- Department of Gastroenterology, Hospital de la Santa Creu i Sant Pau, CIBERehd, Barcelona, Spain
| | - German Soriano
- Department of Gastroenterology, Hospital de la Santa Creu i Sant Pau, CIBERehd, Barcelona, Spain
| | - Shiv K Sarin
- Institute of Liver and Biliary Sciences, New Delhi, India
| | - Rakhi Maiwall
- Institute of Liver and Biliary Sciences, New Delhi, India
| | - Prasun K Jalal
- Department of Gastroenterology and Hepatology, Baylor College of Medicine, Houston, TX, USA
| | - Saba Abdulsada
- Department of Gastroenterology and Hepatology, Baylor College of Medicine, Houston, TX, USA
| | | | - Anand V Kulkarni
- Department of Hepatology, Asian Institute of Gastroenterology, Hyderabad, India
| | - P Nagaraja Rao
- Department of Hepatology, Asian Institute of Gastroenterology, Hyderabad, India
| | | | - Lubomir Skladaný
- Division of Hepatology, Gastroenterology and Liver Transplantation, Department of Internal Medicine II, Slovak Medical University, Slovak Republic; F. D. Roosevelt University Hospital, Banska Bystrica, Slovak Republic
| | - Natália Bystrianska
- Division of Hepatology, Gastroenterology and Liver Transplantation, Department of Internal Medicine II, Slovak Medical University, Slovak Republic; F. D. Roosevelt University Hospital, Banska Bystrica, Slovak Republic
| | | | - Ana Clemente-Sanchez
- Center for Liver Diseases, Division of Gastroenterology, Hepatology and Nutrition, University of Pittsburgh Medical Center, PA, USA; Liver Unit, Department of Digestive Diseases Hospital General Universitario Gregorio Marañón Madrid, Spain; CIBERehd Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas Madrid, Spain
| | - Diego Rincón
- Liver Unit, Department of Digestive Diseases Hospital General Universitario Gregorio Marañón Madrid, Spain; CIBERehd Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas Madrid, Spain
| | - Tehseen Haider
- Division of Gastroenterology and Hepatology, Montefiore Medical Center, Bronx, NY, USA
| | - Kristina R Chacko
- Division of Gastroenterology and Hepatology, Montefiore Medical Center, Bronx, NY, USA
| | - Fernando Cairo
- Liver Transplant Unit, Hospital El Cruce, Florencio Varela, Buenos Aires, Argentina
| | | | - Gustavo A Romero
- Sección Hepatología, Hospital de Gastroenterología Dr. Carlos Bonorino Udaondo, Buenos Aires, Argentina
| | - Florencia D Pollarsky
- Sección Hepatología, Hospital de Gastroenterología Dr. Carlos Bonorino Udaondo, Buenos Aires, Argentina
| | - Juan Carlos Restrepo
- Unidad de Hepatología del Hospital Pablo Tobon Uribe, Grupo de Gastrohepatología de la Universidad de Antioquia, Medellín, Colombia
| | - Susana Castro-Sanchez
- Unidad de Hepatología del Hospital Pablo Tobon Uribe, Grupo de Gastrohepatología de la Universidad de Antioquia, Medellín, Colombia
| | - Luis G Toro
- Hepatology and Liver Transplant Unit, Hospitales de San Vicente Fundación de Medellín y Rionegro, Colombia
| | - Pamela Yaquich
- Departamento de Gastroenterología, Hospital San Juan de Dios, Santiago, Chile
| | - Manuel Mendizabal
- Hepatology and Liver Transplant Unit, Hospital Universitario Austral, Buenos Aires, Argentina
| | | | - Adrián Narvaez
- Liver Unit, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina
| | - Fernando Bessone
- Hospital Provincial del Centenario, Universidad Nacional de Rosario, Rosario, Argentina
| | | | - Diego Piombino
- Servicio de Medicina Interna del Hospital de Emergencias Dr Clemente Alvarez de Rosario, Santa Fe, Argentina
| | - Melisa Dirchwolf
- Unidad de Hígado, Hospital Privado de Rosario, Rosario, Argentina
| | - Juan Pablo Arancibia
- Departamento de Gastroenterología y Hepatología, Clínica Santa María, Santiago, Chile
| | - José Altamirano
- Department of Internal Medicine, Hospital Quironsalud, Barcelona, Spain
| | - Won Kim
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul National University College of Medicine, Seoul, South Korea
| | - Roberta C Araujo
- Gastroenterology Division, Ribeirão Preto Medical School, University of São Paulo, 14048-900 Ribeirão Preto, SP, Brazil
| | - Andrés Duarte-Rojo
- Center for Liver Diseases, Division of Gastroenterology, Hepatology and Nutrition, University of Pittsburgh Medical Center, PA, USA
| | - Victor Vargas
- Liver Unit, Hospital Vall d'Hebron, Universitat Autonoma Barcelona, CIBEREHD, Barcelona, Spain
| | - Pierre-Emmanuel Rautou
- Université de Paris, Centre de recherche sur l'inflammation, Inserm, U1149, CNRS, ERL8252, F-75018 Paris, France; Service d'Hépatologie, DHU Unity, DMU Digest, Hôpital Beaujon, AP-HP, Clichy, France; Centre de Référence des Maladies Vasculaires du Foie, French Network for Rare Liver Diseases (FILFOIE), European Reference Network on Hepatological Diseases (ERN RARE-LIVER), Belgium
| | - Tazime Issoufaly
- Université de Paris, Centre de recherche sur l'inflammation, Inserm, U1149, CNRS, ERL8252, F-75018 Paris, France; Service d'Hépatologie, DHU Unity, DMU Digest, Hôpital Beaujon, AP-HP, Clichy, France; Centre de Référence des Maladies Vasculaires du Foie, French Network for Rare Liver Diseases (FILFOIE), European Reference Network on Hepatological Diseases (ERN RARE-LIVER), Belgium
| | | | - Aldo Torre
- Gastroenterology Department, Instituto Nacional de Ciencias Médicas y Nutrición "Salvador Zubiràn", Mexico City, Mexico
| | - Michael R Lucey
- Division of Gastroenterology and Hepatology, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | - Philippe Mathurin
- Hôpital Claude Huriez, Services des Maladies de l'Appareil Digestif, CHRU Lille, and Unité INSERM 995, Lille, France
| | - Alexandre Louvet
- Hôpital Claude Huriez, Services des Maladies de l'Appareil Digestif, CHRU Lille, and Unité INSERM 995, Lille, France
| | - Guadalupe García-Tsao
- Section of Digestive Diseases, Yale University School of Medicine/VA-CT Healthcare System, New Haven/West Haven, USA
| | - José Alberto González
- Gastroenterology Department, Hospital Universitario "Dr José E González" Universidad Autónoma de Nuevo León, Monterrey, Mexico
| | - Elizabeth Verna
- Division of Digestive and Liver Diseases, Department of Medicine and Center for Liver Disease and Transplantation, Columbia University Irving Medical Center, New York, NY, USA
| | - Robert S Brown
- Division of Gastroenterology and Hepatology, Weill Cornell Medical College, New York, NY
| | - Juan Pablo Roblero
- Sección Gastroenterología, Hospital Clínico Universidad de Chile, Escuela de Medicina Universidad de Chile, Santiago, Chile
| | - Juan G Abraldes
- Division of Gastroenterology, Liver Unit, University of Alberta, Edmonton, Canada
| | - Marco Arrese
- Department of Gastroenterology, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Vijay H Shah
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - Patrick S Kamath
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - Ashwani K Singal
- Division of Gastroenterology and Hepatology, Department of Medicine, University of South Dakota Sanford School of Medicine, Sioux Falls, SD, USA
| | - Ramon Bataller
- Center for Liver Diseases, Division of Gastroenterology, Hepatology and Nutrition, University of Pittsburgh Medical Center, PA, USA
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3
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Díaz LA, Idalsoaga F, Fuentes-López E, Márquez-Lomas A, Ramírez CA, Roblero JP, Araujo RC, Higuera-de-la-Tijera F, Toro LG, Pazmiño G, Montes P, Hernandez N, Mendizabal M, Corsi O, Ferreccio C, Lazo M, Brahmania M, Singal AK, Bataller R, Arrese M, Arab JP. Impact of Public Health Policies on Alcohol-Associated Liver Disease in Latin America: An Ecological Multinational Study. Hepatology 2021; 74:2478-2490. [PMID: 34134172 DOI: 10.1002/hep.32016] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 06/05/2021] [Accepted: 06/08/2021] [Indexed: 12/13/2022]
Abstract
BACKGROUND AND AIMS Alcohol-associated liver disease (ALD) is the leading cause of liver-related mortality in Latin America, yet the impact of public health policies (PHP) on liver disease is unknown. We aimed to assess the association between alcohol PHP and deaths due to ALD in Latin American countries. APPROACH AND RESULTS We performed an ecological multinational study including 20 countries in Latin America (628,466,088 inhabitants). We obtained country-level sociodemographic information from the World Bank Open Data source. Alcohol-related PHP data for countries were obtained from the World Health Organization Global Information System of Alcohol and Health. We constructed generalized linear models to assess the association between the number of PHP (in 2010) and health outcomes (in 2016). In Latin America, the prevalence of obesity was 27% and 26.1% among male and female populations, respectively. The estimated alcohol per capita consumption among the population at 15 years old or older was 6.8 L of pure alcohol (5.6 recorded and 1.2 unrecorded). The overall prevalence of alcohol use disorders (AUD) was 4.9%. ALD was the main cause of cirrhosis in 64.7% of male and 40.0% of female populations. A total of 19 (95%) countries have at least one alcohol-related PHP on alcohol. The most frequent PHP were limiting drinking age (95%), tax regulations (90%), drunk-driving policies and countermeasures (90%), and government monitoring systems and community support (90%). A higher number of PHP was associated with a lower ALD mortality (PR, 0.76; 95% CI, 0.61-0.93; P = 0.009), lower AUD prevalence (PR, 0.80; 95% CI, 0.65-0.99; P = 0.045), and lower alcohol-attributable road traffic deaths (PR, 0.81; 95% CI, 0.65-1.00; P = 0.051). CONCLUSIONS Our study indicates that in Latin America, countries with higher number of PHP have lower mortality due to ALD, lower prevalence of AUD, and lower alcohol-attributable road traffic mortality.
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Affiliation(s)
- Luis Antonio Díaz
- Departamento de Gastroenterología, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Francisco Idalsoaga
- Departamento de Gastroenterología, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Eduardo Fuentes-López
- Departamento de Ciencias de la Salud, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | | | | | - Juan Pablo Roblero
- Sección Gastroenterología, Hospital Clínico Universidad de Chile, Escuela de Medicina Universidad de Chile, Santiago, Chile
| | - Roberta C Araujo
- Gastroenterology Division, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil
| | | | - Luis Guillermo Toro
- Hepatology and Liver Transplant Unit, Hospitales de San Vicente Fundación de Medellín y Rionegro, Medellin, Colombia
| | - Galo Pazmiño
- Department of Gastroenterology, Pontificia Universidad Católica del Ecuador, Quito, Ecuador
| | - Pedro Montes
- Department of Gastroenterology, Hospital Nacional Daniel A. Carrión, Callao, Perú
| | - Nelia Hernandez
- Clínica de Gastroenterología, Hospital de Clínicas, Facultad de Medicina, Universidad de la República Uruguay, Montevideo, Uruguay
| | - Manuel Mendizabal
- Hepatology and Liver Transplant Unit, Hospital Universitario Austral, Buenos Aires, Argentina
| | - Oscar Corsi
- Departamento de Medicina Interna, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Catterina Ferreccio
- Public Health Department, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile.,Advanced Center for Chronic Diseases, ACCDis, Santiago, Chile
| | - Mariana Lazo
- Department of Community Health and Prevention, Dornsife School of Public Health, Drexel University, Philadelphia, PA.,Urban Health Collaborative, Dornsife School of Public Health, Drexel University, Philadelphia, PA.,Division of General Internal Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Mayur Brahmania
- Department of Medicine, Division of Gastroenterology, Western University, London Health Sciences Center, London, ON, Canada
| | - Ashwani K Singal
- Division of Transplant Hepatology, Department of Medicine, Avera Transplant Institute, University of South Dakota Sanford School of Medicine, Sioux Falls, SD
| | - Ramon Bataller
- Center for Liver Diseases, Division of Gastroenterology, Hepatology and Nutrition, University of Pittsburgh Medical Center, Pittsburgh, PA
| | - Marco Arrese
- Departamento de Gastroenterología, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Juan Pablo Arab
- Departamento de Gastroenterología, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
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4
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Henry DD, Ciriaco FM, Araujo RC, Garcia-Ascolani ME, Fontes PLP, Oosthuizen N, Sanford CD, Schulmeister TM, Ruiz-Moreno M, Lamb GC, DiLorenzo N. Effects of bismuth subsalicylate and calcium-ammonium nitrate on ruminal in vitro fermentation of bahiagrass hay with supplemental molasses. Animal 2021; 15:100195. [PMID: 34029791 DOI: 10.1016/j.animal.2021.100195] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 02/03/2021] [Accepted: 02/05/2021] [Indexed: 10/21/2022] Open
Abstract
There is a need to increase efficiency of beef production. Decreasing losses of CH4 and improving byproduct utilization are popular strategies. Two feed additives were tested to find potential solutions. Three randomized complete block design experiments were performed using batch culture systems to evaluate the effects of bismuth subsalicylate (BSS) and calcium-ammonium nitrate (CAN) on in vitro ruminal fermentation of bahiagrass hay and supplemental molasses. The first experiment contained four treatments: (1) basal substrate; (2) basal substrate with 0.75% urea (DM basis); (3) basal substrate with 1.2% CAN and 0.38% urea (DM basis); and (4) basal substrate with 2.4% CAN (DM basis). Treatments 2, 3, and 4 were isonitrogenous. The second experiment had a 4 × 3 factorial arrangement of treatments with 4 concentrations of BSS (0.00, 0.33, 0.66, and 1.00%; DM basis) and 3 concentrations of CAN (0.0, 1.2, and 2.4%; DM basis). The third experiment had the following treatments: (1) basal substrate; (2) basal substrate with 0.05% BSS (DM basis); (3) basal substrate with 0.10% BSS (DM basis); and (4) basal substrate with 0.33% BSS (DM basis). For all experiments, basal substrate consisted of Pensacola bahiagrass hay (Paspalum notatum Flüggé; 80% substrate DM) and molasses (20% substrate DM). All data were analyzed using the MIXED procedure of SAS. In Exp. 1, in vitro organic matter (OM) digestibility (IVOMD) was linearly reduced (P < 0.001) with the inclusion of CAN, and CH4, in mmol/g OM fermented, was decreased linearly (P < 0.001). The volatile fatty acid (VFA) profile was not impacted by the inclusion of nonprotein nitrogen (NPN) or CAN (P > 0.05). In Exp. 2, except for CH4 production (P < 0.05), there were no BSS × CAN interactions. Linear reductions in total gas production (P < 0.001), IVOMD (P < 0.001), and total concentration of VFA (P = 0.007) were observed with the inclusion of BSS up to 1%. The inclusion of BSS decreased H2S production in a quadratic manner (P = 0.024). In Exp. 3, IVOMD was not impacted by the inclusion of BSS (P > 0.05); however, production of H2S was linearly decreased (P = 0.004) with the inclusion of BSS up to 0.33%. In conclusion, in vitro fermentation was negatively impacted by the inclusions of BSS, up to 1%, and CAN, up to 2.4%; however, BSS decreased production of H2S when included up to 0.33% without impeding fermentation, while CAN decreased CH4 production.
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Affiliation(s)
- D D Henry
- Department of Animal Sciences, North Florida Research and Education Center, University of Florida, Marianna, FL 32446-7906, USA; Department of Animal and Food Sciences, Texas Tech University, Lubbock, TX 79409-2141, USA.
| | - F M Ciriaco
- Department of Animal and Food Sciences, Texas Tech University, Lubbock, TX 79409-2141, USA
| | - R C Araujo
- GRASP Ind. & Com. LTDA, Curitiba, Paraná 81260-000, Brazil; EW
- Nutrition GmbH, Visbek 49429, Germany
| | - M E Garcia-Ascolani
- Department of Animal Sciences, North Florida Research and Education Center, University of Florida, Marianna, FL 32446-7906, USA
| | - P L P Fontes
- Department of Animal and Dairy Science, University of Georgia, Athens, GA 30602-1506, USA
| | - N Oosthuizen
- Department of Animal Science, Texas A&M University, College Station, TX 77843-2471, USA
| | - C D Sanford
- Department of Animal Sciences, North Florida Research and Education Center, University of Florida, Marianna, FL 32446-7906, USA
| | - T M Schulmeister
- Department of Animal Sciences, North Florida Research and Education Center, University of Florida, Marianna, FL 32446-7906, USA
| | - M Ruiz-Moreno
- Department of Animal Sciences, North Florida Research and Education Center, University of Florida, Marianna, FL 32446-7906, USA
| | - G C Lamb
- Department of Animal Science, Texas A&M University, College Station, TX 77843-2471, USA
| | - N DiLorenzo
- Department of Animal Sciences, North Florida Research and Education Center, University of Florida, Marianna, FL 32446-7906, USA
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Katiki LM, Araujo RC, Ziegelmeyer L, Gomes ACP, Gutmanis G, Rodrigues L, Bueno MS, Veríssimo CJ, Louvandini H, Ferreira JFS, Amarante AFT. Evaluation of encapsulated anethole and carvone in lambs artificially- and naturally-infected with Haemonchus contortus. Exp Parasitol 2019; 197:36-42. [PMID: 30633915 DOI: 10.1016/j.exppara.2019.01.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 11/30/2018] [Accepted: 01/07/2019] [Indexed: 11/30/2022]
Abstract
Molecules from natural sources, such as essential oils, have shown activity against parasites in vitro, but have not yet been explored extensively in vivo. Anethole and carvone (10% each), encapsulated with 80% of a solid matrix, referred to as EO (encapsulated oils), were tested in vivo in 2 experiments. In Experiment 1: Lambs were artificially infected with multidrug resistant Haemonchus contortus, or left uninfected, and treated (or not) with 50 mg/kg bw (body weight) of EO in a controlled environment. Thirty-two male lambs were kept in individual cages for a period of 45 days, after which animals were evaluated for parasitological, hematological, toxicological, and nutritional parameters. After 45 days of treatment, EO at 50 mg/kg bw provided a significant (P ≤ 0.05) reduction in fecal egg count (FEC). Although FEC was reduced, animals from both treatments had similar counts of total adult worms. The low FEC was caused probably by a significant reduction (P ≤ 0.05) in both male worm size and female fecundity. Dry matter intake of uninfected controls was significantly (P ≤ 0.05) reduced, although no toxicity was observed in treated animals. Thus, in Experiment 2, conducted for five months we used an EO dose of 20 mg/kg bw. Thirty-four weaned lambs, free of parasites, were divided in two groups and kept in collective pens. One group received EO at 20 mg/kg bw mixed with concentrate for 5 months and the other was kept as a control group (CTL). Parasitological and hematological parameters as well as body weight were evaluated. In the first 2.5 months, CTL and EO groups were confined, and both presented similar clinical parameters. Then, animals were allotted to graze on contaminated pastures to acquire natural infection for the next 2.5 months. The infection was patent after 25 days and both groups had similar decreases in weight gain, increases in FEC, and decreases in blood parameters. Coprocultures from CTL and EO groups established that parasite population was 90% Haemonchus sp. We concluded that the technology of encapsulation is safe and practical to deliver to lambs at the farm level and anethole and carvone at 50 mg/kg bw caused a significant decrease in FEC and, consequently, in pasture contamination by free living stages of H. contortus. However, EO at 20 mg/kg bw was not effective to prevent or treat sheep naturally-infected with gastrointestinal nematodes.
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Affiliation(s)
- L M Katiki
- Instituto de Zootecnia (IZ/SAA), Rua Heitor Penteado 56, CEP 13460-000, Nova Odessa, SP, Brazil.
| | - R C Araujo
- GRASP Ind. e Com. LTDA, Av. Juscelino Kubitschek de Oliveira, CEP 81.260-000, Curitiba, PR, Brazil
| | - L Ziegelmeyer
- Instituto de Zootecnia (IZ/SAA), Rua Heitor Penteado 56, CEP 13460-000, Nova Odessa, SP, Brazil
| | - A C P Gomes
- Instituto de Zootecnia (IZ/SAA), Rua Heitor Penteado 56, CEP 13460-000, Nova Odessa, SP, Brazil
| | - G Gutmanis
- Instituto de Zootecnia (IZ/SAA), Rua Heitor Penteado 56, CEP 13460-000, Nova Odessa, SP, Brazil
| | - L Rodrigues
- Instituto de Zootecnia (IZ/SAA), Rua Heitor Penteado 56, CEP 13460-000, Nova Odessa, SP, Brazil
| | - M S Bueno
- Instituto de Zootecnia (IZ/SAA), Rua Heitor Penteado 56, CEP 13460-000, Nova Odessa, SP, Brazil
| | - C J Veríssimo
- Instituto de Zootecnia (IZ/SAA), Rua Heitor Penteado 56, CEP 13460-000, Nova Odessa, SP, Brazil
| | - H Louvandini
- Centro de Energia Nuclear na Agricultura (CENA/USP), Rua do Centenário 303, CEP 13400-970, Piracicaba, SP, Brazil
| | - J F S Ferreira
- US Salinity Lab (USDA-ARS), 450 W. Big Springs Rd., Riverside, CA, 92507, USA
| | - A F T Amarante
- Instituto de Biociências (UNESP), CEP 18618-689, Botucatu, SP, Brazil
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6
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Lee C, Araujo RC, Koenig KM, Beauchemin KA. Effects of encapsulated nitrate on growth performance, carcass characteristics, nitrate residues in tissues, and enteric methane emissions in beef steers: Finishing phase. J Anim Sci 2018; 95:3712-3726. [PMID: 28805918 DOI: 10.2527/jas.2017.1461] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
A finishing feedlot study was conducted with beef steers to determine effects of encapsulated nitrate (EN) on growth performance, carcass characteristics, methane production, and nitrate (NO) residues in tissues. The 132 crossbred steers were backgrounded in a feedlot for 91 d and transitioned for 28 days to the high-concentrate diets evaluated in the present study, maintaining the treatment and pen assignments designated at the start of the backgrounding period. The steers were initially assigned to 22 pens (6 animals per pen) in a randomized complete block design with BW (18 pens) and animals designated for methane measurement (4 pens) as blocking factors. Five animals in each pen designated for methane measurement (total of 20 animals) were monitored for methane emissions in respiratory chambers twice during the experiment. Pens received 3 dietary treatments (7 pens each): Control, a finishing diet supplemented with urea; 1.25% EN, control diet supplemented with 1.25% encapsulated NO in dietary DM that partially replaced urea; and 2.5% EN, control diet supplemented with 2.5% EN (DM basis) fully replacing urea. The final pen designated only for methane measurement received a fourth dietary treatment, 2.3% UEN, the control diet supplemented with unencapsulated NO (UEN) fully replacing urea. The cattle weighed 449 ± SD 32 kg at the start of the 150-d finishing period. The 2.5% EN diet decreased ( < 0.01) DMI compared with Control and 1.25% EN diets. Feeding EN tended to increase ( = 0.092) ADG compared with Control, and G:F was improved ( < 0.01) for EN compared with Control. No differences in methane production (g/d) and yield (g/kg DMI) were observed among treatments. Inclusion of EN in the diets increased ( ≤ 0.03) sorting in favor of large and medium particles and against small and fine particles. Plasma NO and NO concentrations were elevated ( < 0.01) with EN in a dose-response manner, but total blood methemoglobin levels for all treatments were low, below the detection limit. Feeding EN increased ( < 0.01) NO concentrations of samples from muscle, fat, liver, and kidney; NO concentrations of these tissues were similar between 1.25% EN and 2.3% UEN. In conclusion, inclusion of 2.5% EN in a finishing diet (DM basis; about 2% NO) did not cause NO toxicity or any health problems in the long term. In comparison with supplemental urea, feeding EN improved feed efficiency despite increases in sorting against dietary EN.
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7
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Lee C, Araujo RC, Koenig KM, Beauchemin KA. Effects of encapsulated nitrate on growth performance, nitrate toxicity, and enteric methane emissions in beef steers: Backgrounding phase. J Anim Sci 2018; 95:3700-3711. [PMID: 28805908 DOI: 10.2527/jas.2017.1460] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
A long-term experiment was conducted to examine the effects of feeding encapsulated nitrate (EN) on growth, enteric methane production, and nitrate (NO) toxicity in beef cattle fed a backgrounding diet. A total of 108 crossbred steers (292 ± 18 kg) were blocked by BW and randomly assigned to 18 pens. The pens (experimental unit; 6 animals per pen) received 3 dietary treatments: Control, a backgrounding diet supplemented with urea; 1.25% EN, control diet supplemented with 1.25% encapsulated calcium ammonium NO (i.e., EN) in dietary DM, which partially replaced urea; or 2.5% EN, control diet supplemented with 2.5% EN (DM basis) fully replacing urea. Additionally, 24 steers were located in 4 pens and randomly assigned to 1 of the above 3 dietary treatments plus a fourth treatment: 2.3% UEN, control diet supplemented with 2.3% unencapsulated calcium ammonium NO (UEN) fully replacing urea. Animals in the additional 4 pens were used for methane measurement in respiratory chambers, and the pens (except UEN) were also part of the performance study (i.e., = 7 pens/treatment). The experiment was conducted for 91 d in a randomized complete block design. During the experiment, DMI was not affected by inclusion of EN in the diet. Feeding EN had no effect on BW, ADG, and G:F ( ≥ 0.57). Methane production (g/d) tended to decrease ( = 0.099) with EN and UEN, but yield (g/kg DMI) did not differ ( = 0.56) among treatments. Inclusion of EN in the diet increased ( ≤ 0.02) sorting of the diets in favor of large and medium particles and against small and fine particles, resulting in considerable increases in NO concentrations of orts without affecting DMI. Plasma NO-N and NO-N concentrations increased ( ≤ 0.05) for EN compared with Control in a dose response manner, but blood methemoglobin levels were below the detection limit. Nitrate concentration in fecal samples slightly increased (from 0.01% to 0.14% DM; < 0.01) with increasing levels of EN in the diet. In conclusion, EN can be used as a feed additive replacing urea in beef cattle during a backgrounding phase in the long term without NO intoxication or any negative effects on growth performance. In addition, the study confirmed that feeding EN tended to decrease enteric methane production in the long term.
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8
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Luciano RP, Wajchenberg M, Almeida SS, Amorim CEN, Rodrigues LMR, Araujo RC, Puertas EB, Faloppa F. Genetic ACE I/D and ACTN3 R577X polymorphisms and adolescent idiopathic scoliosis. Genet Mol Res 2016; 15:gmr-15-gmr15048959. [PMID: 27819725 DOI: 10.4238/gmr15048959] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The etiology of adolescent idiopathic scoliosis remains unknown. Angiotensin-converting enzyme and α-actinin-3 polymorphisms influence the characteristics of muscle fibers. The aim of this study was to examine the association between idiopathic scoliosis and genetic polymorphism of angiotensin-converting enzyme and α-actinin-3. Ninety-seven females with scoliosis, and 137 healthy, age-matched control females were studied. The presence of polymorphisms was determined by PCR. A χ2 test was used to analyze differences, and odds ratios were estimated. The frequencies of ACE genotypes in the scoliotic group were 46.4% DD, 45.4% ID, and 8.2% II, while in the control group they were 40.1% DD, 43.8% ID, and 16.1% II (P = 0.197). The D allele had a frequency of 69.1% in patients with idiopathic scoliosis and 62% in the control group (P = 0.116). The frequencies of ACTN3 genotypes in females with scoliosis were 31.8% RR, 49.4% RX, and 18.8% XX, while in the control group they were 35% RR, 49% RX, and 16% XX (P = 0.810). The frequency of the R allele was 56.4% in the scoliotic group and 59.6% in the control group (P = 0.518). There was no statistically significant association between angiotensin-converting enzyme or α-actinin-3 polymorphisms and the presence of adolescent idiopathic scoliosis in females.
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Affiliation(s)
- R P Luciano
- Departamento de Ortopedia e Traumatologia, Universidade Federal de São Paulo, São Paulo, SP, Brasil
| | - M Wajchenberg
- Departamento de Ortopedia e Traumatologia, Universidade Federal de São Paulo, São Paulo, SP, Brasil
| | - S S Almeida
- Departamento de Biofísica, Laboratório de Pesquisa Genética do Exercício e Metabolismo da Universidade Federal de São Paulo, São Paulo, SP, Brasil
| | - C E N Amorim
- Departamento de Biofísica, Laboratório de Pesquisa Genética do Exercício e Metabolismo da Universidade Federal de São Paulo, São Paulo, SP, Brasil
| | - L M R Rodrigues
- Departamento de Ortopedia e Traumatologia, Universidade Federal de São Paulo, São Paulo, SP, Brasil
| | - R C Araujo
- Departamento de Biofísica, Laboratório de Pesquisa Genética do Exercício e Metabolismo da Universidade Federal de São Paulo, São Paulo, SP, Brasil
| | - E B Puertas
- Departamento de Ortopedia e Traumatologia, Universidade Federal de São Paulo, São Paulo, SP, Brasil
| | - F Faloppa
- Departamento de Ortopedia e Traumatologia, Universidade Federal de São Paulo, São Paulo, SP, Brasil
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9
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Lee C, Araujo RC, Koenig KM, Beauchemin KA. Effects of feed consumption rate of beef cattle offered a diet supplemented with nitrate ad libitum or restrictively on potential toxicity of nitrate. J Anim Sci 2016; 93:4956-66. [PMID: 26523588 DOI: 10.2527/jas.2015-9435] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The objective of the study was to investigate the effects of feed consumption rate on potential toxicity, rumen fermentation, and eating behavior when beef heifers were fed a diet supplemented with nitrate (NI). Twelve ruminally cannulated heifers (827 ± 65.5 kg BW) were used in a randomized complete block design. The experiment consisted of 10-d adaptation, 8-d urea-feeding, and 3-d nitrate-feeding periods. All heifers were fed a diet supplemented with urea (UR) during the adaptation and urea-feeding periods, whereas the NI diet (1.09% NO in dietary DM) was fed during the nitrate-feeding period. After adaptation, heifers were randomly assigned to ad libitum or restrictive feeding (about 80% of ad libitum intake) for the urea- and nitrate-feeding periods. Ad libitum DMI decreased (14.1 vs. 15.1 kg/d; < 0.01) when heifers were fed the NI diet compared with the UR diet. The amount of feed consumed increased ( < 0.01) at 0 to 3 h and decreased ( ≤ 0.03) at 3 to 24 h for restrictive vs. ad libitum feeding of both the UR and NI diets. Compared to the UR diet, the NI diet decreased ( < 0.01) feed consumption at 0 to 3 h and increased ( < 0.02) feed consumption at 3 to 24 h (except feed consumption at 9 to 12 h; = 0.90), indicating nitrate feeding changed the consumption pattern (a more even distribution of feed intake over the day). The increased feed consumption from 0 to 3 h after feeding the NI diet restrictively vs. ad libitum numerically decreased ( = 0.11) rumen pH and numerically or significantly increased ( = 0.01 to 0.28) rumen ammonia, NO, and NO; blood methemoglobin; and plasma NO and NO at 3 h. Regression analysis indicated that increased feed consumption (0 to 3 h) exponentially elevated ( < 0.01; = 0.75) blood methemoglobin, and plasma NO + NO among other rumen and blood variables had the greatest correlation (sigmoid response; < 0.01, = 0.47) with feed consumption (0 to 3 h). Particle size distribution of orts was partially altered ( = 0.02 to 0.40) when the NI diet was fed compared with the UR diet. During the nitrate-feeding period, the nitrate content of orts on d 2 and 3 was greater ( = 0.02) than that on d 1. In conclusion, the increased consumption rate of a diet supplemented with nitrate was an important factor influencing risk of nitrate toxicity based on blood methemoglobin and plasma NO. In addition, the pattern of daily feed consumption was altered by nitrate (creating a "nibbling" pattern of eating) in beef heifers.
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10
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Rosa TS, Amorim CEN, Barros CC, Haro AS, Wasinski F, Russo FJ, Bacurau RFP, Araujo RC. Role of leptin in body temperature regulation and lipid metabolism following splenectomy. Neuropeptides 2015; 54:67-72. [PMID: 26526226 DOI: 10.1016/j.npep.2015.10.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2015] [Revised: 10/23/2015] [Accepted: 10/25/2015] [Indexed: 10/22/2022]
Abstract
OBJECTIVE The physiological changes in serum triglycerides and body temperature that are induced by splenectomy are poorly understood. Therefore, the aim of this study was to investigate parameters related to lipid and glucose metabolism, as well as thermoregulation, in splenectomized mice. DESIGN AND METHODS Splenectomized and sham-operated WT mice (C57Bl/6) and ob/ob mice were randomly divided and treated with a standard or high fat diet, and several metabolic parameters and the body temperature were investigated. RESULTS Splenectomy induced a significant increase in triglyceride levels regardless of the diet. It was found that the splenectomized WT mice showed greater serum leptin and insulin levels compared with the sham-operated mice. Additionally, the body temperatures of the splenectomized WT mice were greater than the body temperatures of the control animals regardless of diet; this result too was observed without any significant change in the temperature of the splenectomized ob/ob animals. CONCLUSION The results suggest that splenectomy interferes with serum triglyceride metabolism and body temperature regardless of the fat content in the diet and that leptin is involved in the regulation of body temperature related to splenectomy.
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Affiliation(s)
- T S Rosa
- Department of Biophysics, University Federal of Sao Paulo, UNIFESP, Brazil; Graduate Program on Physical Education and Health, Catholic University of Brasilia, Brasilia, Brazil
| | - C E N Amorim
- Department of Biophysics, University Federal of Sao Paulo, UNIFESP, Brazil
| | - C C Barros
- University Federal of Pelotas, UFPEL, Brazil
| | - A S Haro
- Department of Biophysics, University Federal of Sao Paulo, UNIFESP, Brazil
| | - F Wasinski
- Department of Biophysics, University Federal of Sao Paulo, UNIFESP, Brazil
| | - F J Russo
- Department of Biophysics, University Federal of Sao Paulo, UNIFESP, Brazil
| | | | - R C Araujo
- Department of Biophysics, University Federal of Sao Paulo, UNIFESP, Brazil.
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11
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El-Zaiat HM, Araujo RC, Soltan YA, Morsy AS, Louvandini H, Pires AV, Patino HO, Correa PS, Abdalla AL. Encapsulated nitrate and cashew nut shell liquid on blood and rumen constituents, methane emission, and growth performance of lambs. J Anim Sci 2014; 92:2214-24. [PMID: 24663200 DOI: 10.2527/jas.2013-7084] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Nitrate can be a source of NPN for microbial growth at the same time that it reduces ruminal methane production. The objective of this study was to evaluate the effects of 2 encapsulated nitrate products used as urea replacers on blood and rumen constituents, methane emission, and growth performance of lambs. Eighteen Santa Inês male lambs (27 ± 4.9 kg) were individually allotted to indoor pens and assigned to a randomized complete block design with 6 blocks and 3 dietary treatments: control (CTL) = 1.5% urea, ENP = 4.51% encapsulated nitrate product (60.83% NO3(-) in the product DM), and ENP+CNSL = 4.51% ENP containing cashew nut shell liquid (60.83% NO3(-) and 2.96% cashew nut shell liquid [CNSL] in the product DM). Diets were isonitrogenous with 60:40 concentrate:forage (Tifton 85 hay) ratio. The experiment lasted for 92 d and consisted of 28 d for adaptation (a weekly 33% stepwise replacement of CTL concentrate by nitrate-containing concentrates) and 64 d for data collection. The ENP and ENP+CNSL showed greater (P < 0.05) red blood cell counts than CTL. Blood methemoglobin (MetHb) did not differ (P > 0.05) among treatments, with mean values within normal range and remaining below 1.1% of total hemoglobin. There was an increase (P < 0.05) in total short-chain fatty acids concentration at 3 h postfeeding for ENP, with an additional increase (P < 0.05) observed for ENP+CNSL. No treatment effects (P > 0.05) were observed on acetate to propionate ratio. Methane production (L/kg DMI) was reduced (P < 0.05) with nitrate inclusion, recording 28.6, 19.1, and 19.5 L/kg DMI for CTL, ENP, and ENP+CNSL, respectively. Addition of CNSL did not result (P > 0.05) in further reduction of methane production when compared with ENP. Final BW, DMI, ADG, and feed efficiency were similar (P > 0.05) among treatments. Values for DMI were 1.11, 1.03, and 1.04 kg/d and for ADG were 174, 154, and 158 g for CTL, ENP, and ENP+CNSL, respectively. In conclusion, encapsulated nitrate products showed no risks of toxicity based on MetHb formation. The products persistently reduced methane production without affecting performance. Inclusion of cashew nut shell liquid in the product formulation had no additional benefits on methane mitigation.
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Affiliation(s)
- H M El-Zaiat
- Federal University of Rio Grande do Sul, Faculty of Agronomy, Animal Science Department, Porto Alegre, Brazil
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12
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Almeida JA, A Petriz B, Gomes CPC, Araujo RC, Pereira RW, Franco OL. Exercise training at MLSS decreases weight gain and increases aerobic capacity in obese Zucker rats. Int J Sports Med 2013; 35:199-202. [PMID: 23900899 DOI: 10.1055/s-0033-1349872] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
This study aimed to identify the aerobic capacity enhancement and subsequent body weight (BW) status of obese Zucker rats (OZRs) after 4 weeks of treadmill running exercise at the maximal lactate steady state (MLSS). In addition to obese Zucker rats (OZRs), lean Wistar Kyoto rats (WKYs) were used, and both species were divided into control and exercise groups as follows: obese exercise (OZR-EX, n=5), obese control (OZR-CON, n=5), lean exercise (WKY-EX, n=5) and lean control (WKY-CON, n=5). The OZR and WKY exercise groups trained 5 days per week at 12.5 m.min-1 and 20 m.min-1, respectively. After 4 weeks of training, MLSS was ascertained to evaluate the animals' aerobic capacity using 3 different velocities (12.5, 15 and 17.5 m.min-1 for OZRs and 25, 30 and 35 m.min-1 for WKYs). The MLSS of OZR-EX was identified at the velocity of 15 m.min-1, representing a 20% increase in aerobic capacity after the exercise program. The MLSS of WKY-EX was identified at 30 m.min-1 with a 50% increase of in aerobic capacity. Obese animals that exercised showed reduced weight gain compared to the non-exercise obese control group (p <0.05). Our results thus show that exercise training at MLSS intensity increased the aerobic capacity in both obese and non-obese animals and also reduced BW gain.
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Affiliation(s)
- J A Almeida
- Physical Education, Catholic University of Brasilia, Taguatinga, Brazil
| | - B A Petriz
- Centro de Análises Proteômicas e Bioquímicas. Programa de Pós-Graduação em Ciências Genômicas e Biotecnologia, Universidade Católica de Brasília, Brazil
| | - C P C Gomes
- Centro de Análises Proteômicas e Bioquímicas. Programa de Pós-Graduação em Ciências Genômicas e Biotecnologia, Universidade Católica de Brasília, Brazil
| | - R C Araujo
- Departamento de Biofísica, Universidade Federal de São Paulo, Brazil
| | - R W Pereira
- Centro de Análises Proteômicas e Bioquímicas. Programa de Pós-Graduação em Ciências Genômicas e Biotecnologia, Universidade Católica de Brasília, Brazil
| | - O L Franco
- Centro de Análises Proteômicas e Bioquímicas. Programa de Pós-Graduação em Ciências Genômicas e Biotecnologia, Universidade Católica de Brasília, Brazil
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13
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Abstract
Food intake and nutritional status modify the physiological responses of the immune system to illness and infection and regulate the development of chronic inflammatory processes, such as kidney disease. Adipose tissue secretes immune-related proteins called adipokines that have pleiotropic effects on both the immune and neuroendocrine systems, linking metabolism and immune physiology. Leptin, an adipose tissue-derived adipokine, displays a variety of immune and physiological functions, and participates in several immune responses. Here, we review the current literature on the role of leptin in kidney diseases, linking adipose tissue and the immune system with kidney-related disorders. The modulation of this adipose hormone may have a major impact on the treatment of several immune- and metabolic-related kidney diseases.
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Affiliation(s)
- P M M Moraes-Vieira
- Immunology Department, Institute of Biomedical Science, University of São Paulo, SP, Brazil
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14
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Ferreira EM, Pires AV, Susin I, Mendes CQ, Gentil RS, Araujo RC, Amaral RC, Loerch SC. Growth, feed intake, carcass characteristics, and eating behavior of feedlot lambs fed high-concentrate diets containing soybean hulls. J Anim Sci 2011; 89:4120-6. [PMID: 21666006 DOI: 10.2527/jas.2010-3417] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2023] Open
Abstract
The objectives of this experiment were to determine the effects of replacing ground corn with soybean hulls (SH) in high-concentrate diets on the growth (56-d period), carcass characteristics, and eating behavior of feedlot lambs. Sixty-four Santa Inês ram lambs (18.3 ± 2.8 kg of BW and 69 ± 5 d of age) were assigned to a randomized complete block design experiment with 8 blocks and 4 diets. The control diet contained 10% coastcross (Cynodon sp.) hay, 70% corn, and no SH (SH0) in the dietary DM. In the remaining diets, SH replaced corn at the rate of 15 (SH15), 30 (SH30), or 45% (SH45) of the original corn concentration, resulting in 0, 10.5, 21.0, or 31.4% SH in the dietary DM. Dry matter intake increased linearly (P < 0.01) when SH replaced ground corn (1.0, 1.0, 1.1, and 1.1 kg/d for SH0, SH15, SH30, and SH45, respectively). There was no effect on ADG of lambs, with values of 276, 278, 282, and 287 g for SH0, SH15, SH30, and SH45, respectively. Feed efficiency decreased linearly (P < 0.01) with SH inclusion. Carcass measures were not affected by SH as a replacement for ground corn. Eating time, expressed as minutes per day and minutes per gram of NDF, showed a quadratic effect (P < 0.05), whereas no effect was observed when expressed as minutes per gram of DM. Rumination, in minutes per day, was not influenced by dietary SH inclusion, but a linear decrease (P < 0.01) was observed when this variable was expressed as minutes per gram of NDF. Soybean hulls can replace up to 45% of the ground corn (31.4% of SH in the dietary DM) in high-concentrate diets fed to feedlot lambs without negative effects on ADG and carcass measures. The linear decrease in feed efficiency (11.6% reduction from SH0 to SH45) suggests that optimal dietary SH inclusion rates should be dictated by the relative costs of SH and corn.
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Affiliation(s)
- E M Ferreira
- Departamento de Zootecnia, Escola Superior de Agricultura Luiz de Queiroz, Universidade de São Paulo, Piracicaba, São Paulo, Brazil
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Ferreira EM, Pires AV, Susin I, Mendes CQ, Queiroz MAA, Araujo RC, Gentil RS, Loerch SC. Apparent digestibility, nitrogen balance, and ruminal constituents in ram lambs fed high-concentrate diets containing soybean hulls. J Anim Sci 2011; 89:4127-33. [PMID: 21764840 DOI: 10.2527/jas.2010-3419] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Corn often constitutes the main portion of high-concentrate diets fed to feedlot lambs. However, soybean hulls (SH) may be used to replace corn, and may reduce feed costs and the risk of acidosis. The objective of this experiment was to determine the effect of SH inclusion rate in high-concentrate diets on DMI, apparent digestibility of nutrients, N balance, and some rumen constituents. Sixteen ruminally fistulated Santa Inês ram lambs (44.3 ± 5 kg of BW and 6 mo old) were housed in suspended metabolism crates. A randomized complete block design experiment with 4 diets and 4 blocks was used. Blocks were defined by BW, and diets were allotted randomly within block. The control diet contained 70% corn and 0% SH. In the remaining diets, SH replaced corn at the rate of 15, 30, or 45% of the original corn concentration, which resulted in 0, 10.5, 21.0, and 31.4% of SH in the dietary DM. The DMI (kg/d) increased linearly (P < 0.01) with increasing dietary SH inclusion. A trend was observed for linear decreases (P = 0.10) in apparent DM, OM, and nonfiber carbohydrate digestibility, and a trend was observed for an increase (P = 0.08) in NDF digestibility with increasing dietary SH addition. Apparent digestibilities of CP and ether extract and ADF digestibility were not affected by SH inclusion rate. Total ruminal concentration of short-chain fatty acids was affected quadratically (P = 0.03) by diet; acetate concentration increased linearly (P < 0.01), whereas quadratic effects were observed on propionate concentration (P = 0.03) and acetate-to-propionate ratio (P < 0.01) with increasing dietary SH. Ruminal pH increased linearly (P < 0.01) as corn was replaced by SH. Nitrogen retention was not affected by the addition of SH, in spite of a linear increase in urinary N (P < 0.01). The replacement of corn grain with up to 45% SH (31.4% of SH in the dietary DM) resulted in a trend to decrease apparent digestibility of DM and to increase NDF digestibility, presenting a fermentation pattern that would reduce the risk of acidosis.
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Affiliation(s)
- E M Ferreira
- Departamento de Zootecnia, Escola Superior de Agricultura Luiz de Queiroz, Universidade de São Paulo, Piracicaba, São Paulo, Brazil
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Moraes MR, Bacurau RFP, Simões HG, Campbell CSG, Pudo MA, Wasinski F, Pesquero JB, Würtele M, Araujo RC. Effect of 12 weeks of resistance exercise on post-exercise hypotension in stage 1 hypertensive individuals. J Hum Hypertens 2011; 26:533-9. [DOI: 10.1038/jhh.2011.67] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Higuchi DA, Almeida MC, Barros CC, Sanchez EF, Pesquero PR, Lang EAS, Samaan M, Araujo RC, Pesquero JB, Pesquero JL. Leucurogin, a new recombinant disintegrin cloned from Bothrops leucurus (white-tailed-jararaca) with potent activity upon platelet aggregation and tumor growth. Toxicon 2011; 58:123-9. [PMID: 21641921 DOI: 10.1016/j.toxicon.2011.05.013] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2011] [Revised: 05/17/2011] [Accepted: 05/17/2011] [Indexed: 10/18/2022]
Abstract
Disintegrins and disintegrins-like proteins are able to inhibit platelet aggregation and integrin-mediated cell adhesion. The aim of this study was to produce one disintegrin-like cloned from Bothrops leucurus venom gland and to characterize it regarding biological activity. The recombinant protein was purified by one step procedure involving anion-exchange chromatography (DEAE-cellulose) and presented a molecular mass of 10.4 kDa. The purified protein was able to inhibit platelet aggregation induced by collagen (IC₅₀ = 0.65 μM) and to inhibit growth of Ehrlich tumor implanted in mice by more than 50% after 7 days administration of 10 μg/day. No effects were observed upon adenosine 5'-diphosphate (ADP)-and arachidonic acid (AA)-induced platelet aggregation. The recombinant protein was recognized by an antibody specific for jararhagin one metalloproteinase isolated from Bothrops jararaca venom, and therefore it was named leucurogin. Anti-angiogenesis effect of leucurogin was evaluated by the sponge implant model. After 7 days administration leucurogin inhibited, in a dose dependent way, the vascularization process in the sponge. Leucurogin represents a new biotechnological tool to understand biological processes where disintegrins-like are involved and may help to characterize integrins that can be involved in development and progression of malignant cells.
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Affiliation(s)
- D A Higuchi
- Universidade de Mogi das Cruzes, Av. Dr Cândido Xavier de Almeida e Souza 200, Centro Cívico, 08780-911 Mogi das Cruzes, São Paulo, Brazil
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18
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Motta DF, Lima LCJ, Arsa G, Russo PS, Sales MM, Moreira SR, Morais PK, Almeida WS, Araujo RC, Moraes MR, Pesquero JL, Simões HG, Campbell CSG. Effect of type 2 diabetes on plasma kallikrein activity after physical exercise and its relationship to post-exercise hypotension. Diabetes Metab 2010; 36:363-8. [PMID: 20579916 DOI: 10.1016/j.diabet.2010.03.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2009] [Revised: 03/13/2010] [Accepted: 03/18/2010] [Indexed: 12/15/2022]
Abstract
AIM The present study was undertaken to determine the effects of type 2 diabetes (T2D) on plasma kallikrein activity (PKA) and postexercise hypotension (PEH). METHODS Ten T2D patients (age: 53.6±1.3 years; body mass index: 30.6±1.0kg/m(2); resting blood glucose: 157.8±40.2mgdL(-1)) and 10 non-diabetic (ND) volunteers (age: 47.5±1.0 years; body mass index: 28.3±0.9kg/m(2); resting blood glucose: 91.2±10.5mgdL(-1)) underwent two experimental sessions, consisting of 20min of rest plus 20min of exercise (EXE) at an intensity corresponding to 90% of their lactate threshold (90LT) and a non-exercise control (CON) session. Blood pressure (BP; Microlife BP 3AC1-1 monitor) and PKA were measured during rest and every 15min for 135min of the postexercise recovery period (RP). RESULTS During the RP, the ND individuals presented with PEH at 30, 45 and 120min (P<0.05) while, in the T2D patients, PEH was not observed at any time. PKA increased at 15min postexercise in the ND (P<0.05), but not in the T2D patients. CONCLUSION T2D individuals have a lower PKA response to exercise, which probably suppresses its hypotensive effect, thus reinforcing the possible role of PKA on PEH.
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Affiliation(s)
- D F Motta
- Catholic University of Brasília, UCB, Brazil; Federal University of Minas Gerais, UFMG, Brazil
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de Picoli Souza K, Batista EC, Silva ED, Reis FC, Silva SMA, Araujo RC, Luz J, Santos EL, Pesquero JB. Effect of kinin B2 receptor ablation on skeletal muscle development and myostatin gene expression. Neuropeptides 2010; 44:209-14. [PMID: 20045188 DOI: 10.1016/j.npep.2009.12.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2009] [Revised: 11/30/2009] [Accepted: 12/01/2009] [Indexed: 11/28/2022]
Abstract
Bradykinin (BK) is an active peptide that binds to the kinin B(2) receptor and induces biological events during the development and adult life. In this study we aimed to investigate the effect of kinin B(2) receptor ablation in the postnatal skeletal muscle development and body composition in adult life. For studies of skeletal muscle development, control (C57Bl6 - WT) and B(2) receptor knockout mice (B(2)(-/-)) were sacrificed at 15, 30 and 90days after birth, the gastrocnemius skeletal muscle was weighed and myostatin gene expression evaluated by real time PCR. For energy balance determination, data from control and B(2)(-/-) at 90 and 120days were collected by calorimetric method. Body composition at 120days was determined by chloroform-methanol (total body fat) and Lowry-modified method (total body protein). The results show that B(2)(-/-) have significantly increased total body weight at 15, 30 and 90days of life, when compared to WT. The weight of the gastrocnemius skeletal muscle was also significantly increased at 30 and 90days of life. Body composition analyses revealed that B(2)(-/-) mice exhibit more total corporal protein and less total corporal fat. Energy balance revealed that B(2)(-/-) have increased metabolizable energy intake and energy expenditure when compared to control mice, resulting in a lower energy gain. Interestingly, myostatin mRNA expression was significantly decreased in 15 and 30days old B(2)(-/-) mice and after icatibant treatment of WT adult mice for 5days. In conclusion, together our results show that kinin B(2) receptor deletion increases lean mass, reduces fat mass and improves metabolism efficiency in mice. The mechanism involved in this phenotype could be related to the reduction of myostatin gene expression during postnatal life.
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Affiliation(s)
- K de Picoli Souza
- School of Environmental and Biological Science, Federal University of Grande Dourados, Rodovia Dourados - Itahum, Km 12, 79804-970 Dourados, MS, Brazil
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20
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Araujo RC, Pires AV, Susin I, Mendes CQ, Rodrigues GH, Packer IU, Eastridge ML. Milk yield, milk composition, eating behavior, and lamb performance of ewes fed diets containing soybean hulls replacing coastcross (Cynodon species) hay. J Anim Sci 2008; 86:3511-21. [PMID: 18708603 DOI: 10.2527/jas.2008-0940] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2023] Open
Abstract
The objective of this experiment was to evaluate the effects of replacing coastcross hay NDF by soybean hull (SH) NDF on the lactation performance and eating behavior of ewes and also on the performance of their lambs. Fifty-six Santa Inês lactating ewes (56.1 +/- 6.8 kg of initial BW; mean +/- SD) were penned individually and used in a randomized complete block design with 14 blocks and 4 treatments. Diets were formulated to provide similar concentrations of NDF (56%) and CP (16%). The SH NDF replaced 33 (SH33), 67 (SH67), or 100% (SH100) of the NDF contributed by coastcross hay in a 70% forage-based diet (SH0), resulting in SH inclusion rates of 0, 25, 54, and 85% of the dietary DM. Once a week, from the second to the eighth week of lactation (weaning time), ewes were separated from their lambs, stimulated by a 6-IU i.v. oxytocin injection, and hand milked to empty the udder. After 3 h, milk production was obtained after the same procedure. Quadratic effect for milk production (142.4, 179.8, 212.6, and 202.9 g/3 h) and cubic effect for DMI (2.27, 2.69, 3.25, and 3.00 kg/d) were observed as SH inclusion increased from 0 to 85% of the dietary DM. Milk fat (7.59, 7.86, 7.59, and 7.74%), protein (4.53, 4.43, 4.40, and 4.55%), and total solids (18.24, 18.54, 18.39, and 18.64%) did not differ among the 70% forage-based diet and diets with SH NDF replacing 33, 67, or 100% of the NDF. A linear increase in lactose concentration was observed with SH inclusion. Ewe BW gain during the trial showed a cubic response (0.37, 0.03, 4.80, and 2.80 kg) with SH inclusion. The preweaning ADG of lambs increased linearly, and ADG of lambs after weaning decreased linearly with SH inclusion. Final BW of lambs (2 wk after weaning) did not differ among treatments. Eating behavior observations were conducted with 44 ewes. The same facilities, experimental design, dietary treatments, and feeding management were used. Observations were visually recorded every 5 min for a 24-h period when ewes were 46 +/- 6.8 d in milk. Eating time (min/d, min/g of DMI, and min/g of NDF intake) and time expended in rumination and chewing activities (min/g of DMI and min/g of NDF intake) decreased linearly with the addition of SH in the diets. The inclusion of SH improved DMI and milk production, also reflecting on the BW of lambs at weaning. Milk performance was not affected when SH NDF replaced 100% of hay NDF.
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Affiliation(s)
- R C Araujo
- Departamento de Zootecnia, Escola Superior de Agricultura "Luiz de Queiroz," Universidade de São Paulo, Piracicaba, São Paulo, Brazil
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Higuchi DA, Barbosa CMV, Bincoletto C, Chagas JR, Magalhaes A, Richardson M, Sanchez EF, Pesquero JB, Araujo RC, Pesquero JL. Purification and partial characterization of two phospholipases A2 from Bothrops leucurus (white-tailed-jararaca) snake venom. Biochimie 2007; 89:319-28. [PMID: 17110015 DOI: 10.1016/j.biochi.2006.10.010] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2006] [Accepted: 10/13/2006] [Indexed: 01/15/2023]
Abstract
Two proteins with phospholipase A(2) (PLA(2)) activity were purified to homogeneity from Bothrops leucurus (white-tailed-jararaca) snake venom through three chromatographic steps: Conventional gel filtration on Sephacryl S-200, ion-exchange on Q-Sepharose and reverse phase on Vydac C4 HPLC column. The molecular mass for both enzymes was estimated to be approximately 14 kDa by SDS-PAGE. The N-terminal sequences (48 residues) show that one enzyme presents lysine at position 48 and the other an aspartic acid in this position, and therefore they were designated blK-PLA(2) and blD-PLA(2) respectively. blK-PLA(2) presented negligible levels of PLA(2) activity as compared to that of blD-PLA(2). The PLA(2) activity of both enzymes is Ca(2+)-dependent. blD-PLA(2) did not have any effect upon platelet aggregation induced by arachidonic acid, ADP or collagen, but strongly inhibits coagulation and is able to stimulate Ehrlich tumor growth but not angiogenesis.
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Affiliation(s)
- D A Higuchi
- University of Mogi das Cruzes, Av Dr Candido Xavier de Almeida Souza 200, Centro Cívico, CEP 08780-911 Mogi das Cruzes, São Paulo, Brazil
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22
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Silva JA, Araujo RC, Baltatu O, Oliveira SM, Tschöpe C, Fink E, Hoffmann S, Plehm R, Chai KX, Chao L, Chao J, Ganten D, Pesquero JB, Bader M. Reduced cardiac hypertrophy and altered blood pressure control in transgenic rats with the human tissue kallikrein gene. FASEB J 2000; 14:1858-60. [PMID: 11023967 DOI: 10.1096/fj.99-1010fje] [Citation(s) in RCA: 94] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
To evaluate the cardiovascular actions of kinins, we established a transgenic rat line harboring the human tissue kallikrein gene, TGR(hKLK1). Under the control of the zinc-inducible metallothionein promoter, the transgene was expressed in most tissues including the heart, kidney, lung, and brain, and human kallikrein was detected in the urine of transgenic animals. Transgenic rats had a lower 24-h mean arterial pressure in comparison with control rats, which was further decreased when their diet was supplemented with zinc. The day/night rhythm of blood pressure was significantly diminished in TGR(hKLK1) animals, whereas the circadian rhythms of heart rate and locomotor activity were unaffected. Induction of cardiac hypertrophy by isoproterenol treatment revealed a marked protective effect of the kallikrein transgene because the cardiac weight of TGR(hKLK1) increased significantly less, and the expression of atrial natriuretic peptide and collagen III as markers for hypertrophy and fibrosis, respectively, were less enhanced. The specific kinin-B2 receptor antagonist, icatibant, abolished this cardioprotective effect. In conclusion, the kallikrein-kinin system is an important determinant in the regulation of blood pressure and its circadian rhythmicity. It also exerts antihypertrophic and antifibrotic actions in the heart.
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Affiliation(s)
- J A Silva
- Max-Delbrück-Center for Molecular Medicine, Berlin-Buch, Germany
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Pesquero JB, Araujo RC, Heppenstall PA, Stucky CL, Silva JA, Walther T, Oliveira SM, Pesquero JL, Paiva AC, Calixto JB, Lewin GR, Bader M. Hypoalgesia and altered inflammatory responses in mice lacking kinin B1 receptors. Proc Natl Acad Sci U S A 2000; 97:8140-5. [PMID: 10859349 PMCID: PMC16683 DOI: 10.1073/pnas.120035997] [Citation(s) in RCA: 295] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Kinins are important mediators in cardiovascular homeostasis, inflammation, and nociception. Two kinin receptors have been described, B1 and B2. The B2 receptor is constitutively expressed, and its targeted disruption leads to salt-sensitive hypertension and altered nociception. The B1 receptor is a heptahelical receptor distinct from the B2 receptor in that it is highly inducible by inflammatory mediators such as bacterial lipopolysaccharide and interleukins. To clarify its physiological function, we have generated mice with a targeted deletion of the gene for the B1 receptor. B1 receptor-deficient animals are healthy, fertile, and normotensive. In these mice, bacterial lipopolysaccharide-induced hypotension is blunted, and there is a reduced accumulation of polymorphonuclear leukocytes in inflamed tissue. Moreover, under normal noninflamed conditions, they are analgesic in behavioral tests of chemical and thermal nociception. Using whole-cell patch-clamp recordings, we show that the B1 receptor was not necessary for regulating the noxious heat sensitivity of isolated nociceptors. However, by using an in vitro preparation, we could show that functional B1 receptors are present in the spinal cord, and their activation can facilitate a nociceptive reflex. Furthermore, in B1 receptor-deficient mice, we observed a reduction in the activity-dependent facilitation (wind-up) of a nociceptive spinal reflex. Thus, the kinin B1 receptor plays an essential physiological role in the initiation of inflammatory responses and the modulation of spinal cord plasticity that underlies the central component of pain. The B1 receptor therefore represents a useful pharmacological target especially for the treatment of inflammatory disorders and pain.
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Affiliation(s)
- J B Pesquero
- Molecular Biology of Peptide Hormones Group, and Growth Factors and Regeneration Group in the Department of Neuroscience, Max Delbrück Center for Molecular Medicine, D-13092 Berlin-Buch, Germany
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Araujo RC, Duarte M, Amadio AC. On the inter- and intra-subject variability of the electromyographic signal in isometric contractions. Electromyogr Clin Neurophysiol 2000; 40:225-9. [PMID: 10907600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
The objective of the present study was to evaluate the variability of the surface EMG signal of the same muscle in healthy subjects, because of lack of reproducibility of the EMG signal for the same subject and muscle in different trials of maximal isometric voluntary contraction. The results showed an EMG coefficient of variability of 21.61%, indicating that this variability must be considered in experiments with an inappropriate condition for normalization procedures, such as EMG biofeedback in rehabilitation sessions, or normalization procedures by the maximal isometric voluntary contraction.
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Affiliation(s)
- R C Araujo
- Laboratory of Biomechanics, School of Physical Education and Sports, University of São Paulo, Brazil
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Flores H, Campos F, Araujo RC, Underwood BA. Assessment of marginal vitamin A deficiency in Brazilian children using the relative dose response procedure. Am J Clin Nutr 1984; 40:1281-9. [PMID: 6507348 DOI: 10.1093/ajcn/40.6.1281] [Citation(s) in RCA: 59] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Vitamin A status was determined using fasting plasma levels and the relative dose response (RDR) procedure before and 30, 120, and 180 days after administration of an oral massive (200,000 IU) dose of vitamin A. The study was carried out in Recife, Brazil among 93 children of 7 yr or less from low income families who attended two day-care programs. The RDR procedure is conducted by obtaining a fasting blood (A0), feeding 450 retinol equivalents and obtaining a second blood specimen after 5 h (A5). The RDR-(A5-A0)/A5 X 100. A single massive oral dose of vitamin A was given after conducting the base-line RDR test. The RDR procedure was repeated at 30, 120, and 180 days. Weight and height measurements were obtained at each observation and the bloods were analyzed for Hb, total protein, and serum iron, as well as vitamin A. Serum albumin was determined in 120- and 180-day bloods. Serum iron levels were improved 30 days after supplementation with the massive dose of vitamin A. The RDR procedure was found practical to apply in mildly undernourished children under nonclinical condition. In this group of low income children presumed to be habitually ingesting minimally adequate diets, a serum vitamin A level of 20 micrograms/dl or less invariably was associated with an elevated RDR test. Blood levels between 20 to 40 micrograms/dl were not consistently predictive of the RDR response. All elevated RDR tests reverted to normal after supplementation with vitamin A, presumably indirectly indicating a presupplementation inadequate vitamin A status. Hence, the RDR was a more sensitive indicator of inadequate vitamin A status than was only a serum level of vitamin A when blood levels were above 20 micrograms/dl.(ABSTRACT TRUNCATED AT 250 WORDS)
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