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| 1 | Renin-angiotensin system in the pathogenesis of liver fibrosis显示文摘Hepatic fibrosis is considered a common response to many chronic hepatic injuries.It is a multifunctional process that involves several cell types,cytokines,chemokines and growth factors leading to a disruption of homeostatic mechanisms that maintain the liver ecosystem.In spite of many studies regarding the development of fibrosis,the understanding of the pathogenesis remains obscure.The hepatic tissue remodeling process is highly complex,resulting from the balance between collagen degradation and synthesis.Among the many mediators that take part in this process,the components of the Renin angiotensin system(RAS) have progressively assumed an important role.Angiotensin(Ang)□acts as a profibrotic mediator and Ang-(1-7),the newly recognized RAS component,appears to exert a counter-regulatory role in liver tissue.We briefly review the liver fibrosis process and current aspects of the RAS.This review also aims to discuss some experimental evidence regarding the participation of RAS mediators in the pathogenesis of liver fibrosis,focusing on the putative role of the ACE2-Ang-(1-7)-Mas receptor axis. | Regina Maria Pereira Robson Augusto Souza dos Santos Filipi Leles da Costa Dias Mauro Martins Teixeira Ana Cristina Simoes e Silva | 2009 | World Journal of Gastroenterology2009，15，21： | 37 |
| 2 | Relationship between angiotensin-(1-7) and angiotensin Ⅱ correlates with hemodynamic changes in human liver cirrhosis显示文摘AIM:To measure circulating angiotensins at different stages ofhuman cirrhosis and to further evaluate a possible relationship between renin angiotensin system (RAS) components and hemodynamic changes.METHODS: Patients were allocated into 4 groups: mild-to-moderate liver disease (MLD), advanced liver disease (ALD), patients undergoing liver transplantation, and healthy controls. Blood was collected to determine plasma renin activity (PRA), angiotensin (Ang) , Ang Ⅱ, and Ang-(1-7) levels using radioimmunoassays. During liver transplantation, hemodynamic parameters were determined and blood was simultaneously obtained from the portal vein and radial artery in order to measure RAS components.RESULTS: PRA and angiotensins were elevated in ALD when compared to MLD and controls (P < 0.05). In contrast, Ang was signicantly reduced in MLD. Ang-(1-7)/Ang Ⅱ ratios were increased in MLD when compared to controls and ALD. During transplantation, Ang Ⅱ levels were lower and Ang-(1-7)/Ang Ⅱ ratios were higher in the splanchnic circulation than in the peripheral circulation (0.52 ± 0.08 vs 0.38 ± 0.04, P < 0.02), whereas the peripheral circulating Ang /Ang ratio was elevated in comparison to splanchnic lev-els (0.18 ± 0.02 vs 0.13 ± 0.02, P < 0.04). Ang-(1-7)/Ang Ⅱ ratios positively correlated with cardiac output (r= 0.66) and negatively correlated with systemic vascular resistance (r =-0.70).CONCLUSION: Our ndings suggest that the relation-ship between Ang-(1-7) and Ang Ⅱmay play a role in the hemodynamic changes ofhuman cirrhosis. | Walkíria Wingester Vilas-Boas Antnio Ribeiro-Oliveira Jr Regina Maria Pereira Renata da Cunha Ribeiro Jerusa Almeida Ana Paula Nadu Ana Cristina Simoes e Silva Robson Augusto Souza dos Santos | 2009 | World Journal of Gastroenterology2009，15，20： | 11 |
| 3 | Emerging artificial intelligence applications in liver magnetic resonance imaging显示文摘Chronic liver diseases(CLDs)are becoming increasingly more prevalent in modern society.The use of imaging techniques for early detection,such as magnetic resonance imaging(MRI),is crucial in reducing the impact of these diseases on healthcare systems.Artificial intelligence(AI)algorithms have been shown over the past decade to excel at image-based analysis tasks such as detection and segmentation.When applied to liver MRI,they have the potential to improve clinical decision making,and increase throughput by automating analyses.With Liver diseases becoming more prevalent in society,the need to implement these techniques to utilize liver MRI to its full potential,is paramount.In this review,we report on the current methods and applications of AI methods in liver MRI,with a focus on machine learning and deep learning methods.We assess four main themes of segmentation,classification,image synthesis and artefact detection,and their respective potential in liver MRI and the wider clinic.We provide a brief explanation of some of the algorithms used and explore the current challenges affecting the field.Though there are many hurdles to overcome in implementing AI methods in the clinic,we conclude that AI methods have the potential to positively aid healthcare professionals for years to come. | Charles E Hill Luca Biasiolli Matthew D Robson Vicente Grau Michael Pavlides | 2021 | World Journal of Gastroenterology2021，27，40： | 2 |
| 4 | Effect of propranolol on the splanchnic and peripheral renin angiotensin system in cirrhotic patients显示文摘AIM:To evaluate the effect of β-blockade on angiotensins in the splanchnic and peripheral circulation of cirrhotic patients and also to compare hemodynamic parameters during liver transplantation according to propranolol pre-treatment or not. METHODS:Patients were allocated into two groups:outpatients with advanced liver disease(LD) and during liver transplantation(LT). Both groups were subdivided according to treatment with propranolol or not. Plasma was collected through peripheral venipuncture to determine plasma renin activity(PRA),Angiotensin(Ang) Ⅰ,Ang Ⅱ,and Ang-(1-7) levels by radioimmunoassay in LD group. During liver transplantation,hemodynamic parameters were determined and blood samples were obtained from the portal vein to measure renin angiotensin system(RAS) components.RESULTS:PRA,Ang Ⅰ,Ang Ⅱ and Ang-(1-7) were signifi cantly lower in the portal vein and periphery in all subgroups treated with propranolol as compared to non-treated. The relationships between Ang-(1-7) and Ang Ⅰ levels and between Ang Ⅱ and Ang Ⅰ were significantly increased in LD group receiving propranolol. The ratio between Ang-(1-7) and Ang Ⅱ remained unchanged in splanchnic and peripheral circulation in patients under β-blockade,whereas the relationship between Ang Ⅱ and Ang Ⅰ was significantly increased in splanchnic circulation of LT patients treated with propranolol. During liver transplantation,cardiac output and index as well systemic vascular resistance and index were reduced in propranolol-treated subgroup. CONCLUSION:In LD group,propranolol treatment reduced RAS mediators,but did not change the ratio between Ang-(1-7) and Ang Ⅱ in splanchnic and peripheral circulation. Furthermore,the modification of hemodynamic parameters in propranolol treated patients was not associated with changes in the angiotensin ratio. | Walkíria Wingester Vilas-Boas Antnio Ribeiro-Oliveira Jr Renata da Cunha Ribeiro Renata Lúcia Pereira Vieira Jerusa Almeida Ana Paula Nadu Ana Cristina Sim■es e Silva Robson Augusto Souza Santos | 2008 | World Journal of Gastroenterology2008，14，44： | 2 |
| 5 | Development of hepatorenal syndrome in bile duct ligated rats显示文摘AIM: To evaluate in bile duct ligated rats whether there were progressive alterations of renal function without changes in histopathology. METHODS: Male Wistar rats were submitted to sham-surgery or bile duct ligation (BDL) and divided according to the post-procedure time (2, 4 and 6-wk). To determine renal function parameters, rats wereplaced in metabolic cages and, at the end of the experiment, blood and urine samples were obtained. Histology and hydroxyproline content were analyzed in liver and renal tissue. RESULTS: Rats with 2 wk of BDL increased free water clearance (P = 0.02), reduced urinary osmolality (P = 0.03) and serum creatinine (P = 0.01) in comparison to the sham group. In contrast, rats at 6 wk of BDL showed features of HRS, including signif icant increase in serum creatinine and reductions in creatinine clearance, water excretion and urinary sodium concentration. Rats with 4 wk of BDL exhibited an intermediate stage of renal dysfunction. Progressive hepatic f ibrosis according to post-procedure time was confirmed by histology. The increased levels of liver hydroxyproline contrasted with the absence of structural changes in the kidney, as assessed by histology and unchanged hydroxyproline content in renal tissue. CONCLUSION: Our data show that BDL produced progressive renal dysfunction without structural changes in the kidney, characterizing HRS. The present model will be useful to understand the pathophysiology of HRS. | Regina M Pereira Robson AS dos Santos Eduardo A Oliveira Virgínia HR Leite Filipi LC Dias Alysson S Rezende Lincoln P Costa Lucíola S Barcelos Mauro M Teixeira Ana Cristina Sim■es e Silva | 2008 | World Journal of Gastroenterology2008，14，28： | 2 |
| 6 | CD133,a novel marker for human prostatic epithelial stem cells显示文摘 | Richardson G D Robson C N Lang S H Neal D E Maitland N J Collins A T | 2004 | J Cell Sci2004，117，16： | 1 |
| 7 | Development of swarm transport theory in radio frequency electric and crossed electric and magnetic fields显示文摘 | White R D Ness K F Robson R E | 2002 | Applied Surface Science2002，192，14： | 1 |
| 8 | Effects of postmortem aging time, animal age, and sex on degradation of titin and nebulin in bovine longissimus muscle显示文摘 | HUFF-LONERGAN E PARRISH F C ROBSON R M | 1995 | Anim Sci1995，73，4： | 1 |
| 9 | Changes inplant mitochondrial electron transport alter cellular levels of reac-tive oxygen species and susceptibility to cell death signaling mole-cules显示文摘 | Amirsadeghi S Robson C A McDonald A E | 2006 | Plant Cell physiol2006，47，11： | 1 |
| 10 | Direct and indirect effects of solar ultraviolet-B radiation on longterm decomposition显示文摘 | Pancotto V A Sala O E Robson T M | 2005 | Glob Chang Biol2005，，11： | 1 |
| 11 | Simplified Theory of First-and Second-order Scattering of HF Radio Waves from the Sea显示文摘 | Robson R E | 1984 | Radio Science1984，19，6： | 1 |
| 12 | Direct and indirect effects of solar ultraviolet-B radiation on long-term decomposition 显示文摘 | PANCOTTO V A SALA O E ROBSON T M | 2005 | Global Change Biology2005，11，： | 1 |
| 13 | Ability of coldtolerant plants to grow in hydrocarbon contaminated soil显示文摘 | Robson D B Knight J D Farrell R E | 2003 | Int J Phytoremediation2003，5，： | 1 |
| 14 | Altered expression of inter-leukin-6,interleukin-8 and their receptors in decidua of women withsporadic miscarriage显示文摘 | Pitman H Innes BA Robson SC e( al | 2013 | Hum Reprod2013，28，8： | 1 |
| 15 | Leaf emergence, tiller growth and apical development of nitrogen deficient spring wheat显示文摘 | Longnecker N Kirby E J M Robson A | 1993 | Crop Science1993，33，1： | 1 |
| 16 | Charged-particle transport in gases in electric and magnetic fields crossed at arbitrary angles: Multi-term solution of Boltzmann's equation 显示文摘 | White R D Ness K F Robson R E | 1999 | Phys Rev E1999，60，： | 1 |
| 17 | Interaction integrals in the kinetic theory of gases显示文摘 | Ness K F Robson R E | 1985 | Transport Theory and Statistical Theory1985，14，3： | 1 |
| 18 | Apparent liver blood flow during pregnancy: a serial study using indicyanine green clearance显示文摘 | Robson SC Mutch E Boy R J | 1990 | Br J Obstet Gynaecol1990，97，： | 1 |
| 19 | Multiple dermatofibromas associated with lupus produndus显示文摘 | Chan I Robson A Mellerio J E | 2005 | Clin Exp Dermatol2005，30，2： | 1 |
| 20 | Effects of postmortem aging time, animal age, and sex on degradation of titin and nebulin in bovine longissimus muscle显示文摘 | HUFF-LONERGAN E PARRISH F C ROBSON R M | 1995 | Animal Science1995，73，： | 1 |
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