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Lyapunov stability of competitive cells dynamics in tumor mechanobiology

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Acta Mechanica Sinica 2021年第2期37卷 244-263页

作者： angelo Rosario Carotenuto Arsenio Cutolo Stefania Palumbo Massimiliano Fraldi Department of Structures for Engineering and Architecture University of Napoli Federico IINapoliItaly

Poromechanics plays a key role in modelling hard and soft tissue behaviours,by providing a thermodynamic framework in which chemo-mechanical mutual interactions among fluid and solid constituents can be consistently rooted,at different scale *** this context,how different biological species(including cells,extra-cellular components and chemical metabolites)interplay within complex environments is studied for characterizing the mechanobiology of tumor growth,governed by intra-tumoral residual stresses that initiate mechanotransductive processes deregulating normal tissue homeostasis and leading to tissue *** the coupling between tumor poroelasticity and interspecific competitive dynamics has recently highlighted how microscopic cells and environment interactions influence growth-associated stresses and tumor pathophysiology,the nonlinear interlacing among biochemical factors and mechanics somehow hindered the possibility of gaining qualitative insights into cells *** by this,in the present work we recover the linear poroelasticity in order to benefit of a reduced complexity,so first deriving the well-known Lyapunov stability criterion from the thermodynamic dissipation principle and then analysing the stability of the mechanical competition among cells fighting for common space and resources during cancer growth and *** the end,the linear poroelastic model enriched by interspecific dynamics is also exploited to show how growth anisotropy can alter the stress field in spherical tumor masses,by thus indirectly affecting cell mechano-sensing.

关键词： Tumor growth Poroelasticity Cells competition Volterra-Lotka dynamics Stability

Non invasive evaluation of liver fibrosis in paediatric patients with nonalcoholic steatohepatitis

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World Journal of Gastroenterology 2006年第48期12卷 7821-7825页

作者： angelo iacob.llis Matilde Marcellini angelo Andriulli Francesco Perri Gioacchino Leandro Rita Devito Valerio Nobili Division of Gastroenterology Hospital "Casa Sollievo della Sofferenza" IRCCS San Giovanni Rotondo Italy Liver Unit Bambino Gesu' Children's Hospital Rome Italy Division of Gastroenterology "De Bellis" Hospital IRCCS Castellana Grotte Italy Pathology Department Bambino Gesu' Children's Hospital Rome Italy

AIM: To identify the independent predictors of hepatic fibrosis in 69 children with nonalcoholic steatohepatitis (NASH) due to nonalcoholic fatty liver disease (NAFLD). METHODS: All patients with clinically suspected NASH underwent liver biopsy as a confirmatory test. The following clinical and biochemical variables at baseline were examined as likely predictors of fibrosis at histology: age, body mass index (BMI), systolic blood pressure (SBP), dyastolic blood pressure (DBP), fasting glucose, fasting insulin, homeostatic model assessment for insulin resistence (HOMA-IR), cholesterol, tryglicerides, alanine aminotransferase (ALT), aspartate aminotransferase (AST), AST/ALT ratio, gamma glutamil transferase (GT), platelet count, prothrombin time (PT). RESULTS: At histology 28 (40.6%) patients had no fibrosis and 41 (59.4%) had mild to bridging fibrosis. At multivariate analysis, BMI > 26.3 was the only independent predictor of fibrosis (OR = 5.85, 95% CI = 1.6-21). CONCLUSION: BMI helps identify children with NASH who might have fibrotic deposition in the liver.

关键词： Nonalcoholic steatohepatitis Obesity Bodymass index Liver fibrosis Non invasive diagnosis

One step minilaparotomy-assisted transmesenteric portal vein recanalization combined with transjugular intrahepatic portosystemic shunt placement: A novel surgical proposal in pediatrics

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World Journal of Gastroenterology 2017年第15期23卷 2811-2818页

作者： Gloria Pelizzo Pietro Quaretti Lorenzo Paolo Moramarco Riccardo Corti Marcello Maestri Giulio iacob Valeria Calcaterra Department of Clinical SurgicalDiagnostic and Pediatric SciencesUniversity of Pavia Pediatric Surgery Unit Ospedale dei Bambini“G.di Cristina”Istituto Mediterraneo di Eccellenza Pediatrica Unit of Interventional Radiology Fondazione IRCCS Policlinico San Matteo Radiology Department IRCCS Policlinico San Matteo Foundation Department of Surgery IRCCS Policlinico San Matteo Foundation Pediatric Unit Department of Maternal and Children's HealthFondazione IRCCS Policlinico San Matteo Department of Internal Medicine and Therapeutics University of Pavia

Transjugular intrahepatic portosystemic shunt(TIPS) placement is a standard procedure for the treatment of portal hypertension complications. When this conventional approach is not feasible, alternative procedures for systemic diversion of portal blood have been proposed. A one-step interventional approach, combining minilaparotomy-assisted transmesenteric(MAT) antegrade portal recanalization and TIPS, is described in an adolescent with recurrent esophageal varice bleeding and portal cavernoma(PC). A 16-yearold girl was admitted to our Unit because of repeated bleeding episodes over a short period of time due to esophageal varices in the context of a PC. A portal vein recanalization through an ileocolic vein isolation with the MAT approach followed by TIPS during the same session was performed. In the case of failed portal recanalization, this approach, would also be useful for varice endovascular embolization. Postoperative recovery was uneventful. Treatment consisting of propanolol, enoxaparin and a proton pump inhibitor was prescribed after the procedure. One month post-op, contrast enhanced computed tomography confirmed the patency of the portal and intrahepatic stent grafts. No residual peritoneal fluid was detected nor opacification of the large varices. Endoscopy showed good improvement of the varices. Doppler ultrasound confirmed the accelerated flow in the portal stent and hepatopetal flow inside the intrahepatic portal branches. Three months post-op, TIPS maintained its hourglass shape despite a slight expansion. Portal hypertension and life threatening conditions related to PC would benefit from one-step portal recanalization. MAT-TIPS is feasible and safe for the treatment of PC even in children. This minimally invasive procedure avoids or delays surgical treatment or re-transplantation when necessary in pediatric patients.

关键词： Portal cavernoma Pediatrics Transjugular intrahepatic portosystemic shunt Minilaparotomy-assisted transmesenteric

Small-world networks of neuroblastoma cells cultured in three-dimensional polymeric scaffolds featuring multi-scale roughness

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Neural Regeneration Research 2020年第4期15卷 759-768页

作者： Valentina Onesto angelo Accardo Christophe Vieu Francesco Gentile Center for Advanced Biomaterials for Healthcare Italian Institute of TechnologyNaplesItaly Laboratoire d’Analyse et d’Architecture des Systemes(LAAS) Centre National de la Recherche ScientifiqueUniversite de ToulouseCNRSToulouseFrance Institut National des Sciences Appliquees–INSA ToulouseFrance Department of Electric Engineering and Information Technology University Federico IINaplesItaly Department of Precision and Microsystems Engineering Delft University of TechnologyMekelweg 22628 CD DelftThe Netherlands

Understanding the mechanisms underlying cell-surface interaction is of fundamental importance for the rational design of scaffolds aiming at tissue engineering,tissue repair and neural regeneration ***,we examined patterns of neuroblastoma cells cultured in three-dimensional polymeric scaffolds obtained by two-photon *** of the intrinsic resolution of the technique,the micrometric cylinders composing the scaffold have a lateral step size of^200 nm,a surface roughness of around 20 nm,and large values of fractal dimension approaching *** found that cells in the scaffold assemble into separate groups with many elements per *** cell wiring,we found that resulting networks exhibit high clustering,small path lengths,and small-world *** values of the topological characteristics of the network can potentially enhance the quality,quantity and density of information transported in the network compared to equivalent random graphs of the same *** is one of the first direct observations of cells developing into 3D small-world networks in an artificial matrix.

关键词： 3D networks biomaterials nano-topography network topology neuro-regeneration small-world networks tissue engineering two-photon lithography

Phenotyping Key Fruit Quality Traits in Olive Using RGB Images and Back Propagation Neural Networks

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Plant Phenomics 2023年第3期5卷 484-500页

作者： Giuseppe Montanaro angelo Petrozza Laura Rustioni Francesco Cellini Vitale Nuzzo Università degli Studi della Basilicata 85100 PotenzaItaly ALSIA Agenzia Lucana Sviluppo Innovazione in AgricolturaMetapontum Agrobios Research Center75010 MetapontoItaly Department of Biological and Environmental Sciences and Technologies University of SalentoLecceItaly

To predict oil and phenol concentrations in olive fruit,the combination of back propagation neural networks(BPNNs)and contact-less plant phenotyping techniques was employed to retrieve RGB image-based digital proxies of oil and phenol *** of cultivars(×3)differing in ripening time were sampled(~10-day interval,×2 years),pictured and analyzed for phenol and oil *** to this,fruit samples were pictured and images were segmented to extract the red(R),green(G),and blue(B)mean pixel values that were rearranged in 35 RGB-based colorimetric *** BPNNs were designed using as input variables(a)the original 35 RGB indexes,(b)the scores of principal components after a principal component analysis(PCA)pre-processing of those indexes,and(c)a reduced number(28)of the RGB indexes achieved after a sparse *** results show that the predictions reached the highest mean R^(2) values ranging from 0.87 to 0.95(oil)and from 0.81 to 0.90(phenols)across the *** addition to the R^(2),other performance metrics were calculated(root mean squared error and mean absolute error)and combined into a general performance indicator(GPI).The resulting rank of the GPI suggests that a BPNN with a specific topology might be designed for cultivars grouped according to their ripening *** present study documented that an RGB-based image phenotyping can effectively predict key quality traits in olive fruit supporting the developing olive sector within a digital agriculture domain.

关键词： Image image supporting

A Local Velocity Grid Approach for BGK Equation

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Communications in Computational Physics 2014年第9期16卷 956-982页

作者： Florian Bernard angelo Iollo Gabriella Puppo Department of Mechanical and Aerospace Engineering Politecnico di Torino10129 TorinoItaly. Univ.Bordeaux IMBUMR 5251F-33400 TalenceFrance.INRIAF-33400 TalenceFrance. Dip.di Scienza ed Alta Tecnologia Universita dell’InsubriaComoItaly

The solution of complex rarefied flows with the BGK equation and the Discrete Velocity Method(DVM)requires a large number of velocity grid points leading to significant computational *** propose an adaptive velocity grid approach exploiting the fact that locally in space,the distribution function is supported only by a sub-set of the global velocity *** velocity grid is adapted thanks to criteria based on local temperature,velocity and on the enforcement of mass *** in 1D and 2D are presented for different Knudsen numbers and compared to a global velocity grid BGK solution,showing the computational gain of the proposed approach.

关键词： Kinetic models BGK model discrete velocity method

An Implicit Scheme for Moving Walls and Multi-Material Interfaces in Weakly Compressible Materials

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Communications in Computational Physics 2020年第1期27卷 116-144页

作者： Emanuela Abbate angelo Iollo Gabriella Puppo Universit`a degli Studi dell’Insubria via ValleggioComo 22100Italy Universit́e Bordeaux IMBUMR 5251F-33400 TalenceFrance Equipe-projet Memphis Inria Bordeaux-Sud OuestF-33400 TalenceFrance La Sapienza Universit`a di Roma Piazzale Aldo Moro00185 RomaItaly

We propose a numerical method for the simulation of flows from weakly compressible to low Mach regimes in domains with moving ***-miscible weakly compressible materials separated by an interface are included as *** scheme is fully implicit and it exploits the relaxation all-speed scheme introduced in[1].We consider media with significantly different physical properties and constitutive laws,as fluids and hyperelastic *** proposed numerical scheme is fully Eulerian and it is the same for all *** present numerical validations by simulating weakly compressible fluid/fluid,solid/solid and solid/fluid interactions.

关键词： Multi-material interfaces moving boundaries low Mach regime Eulerian elasticity

Male and female guppies differ in problem-solving abilities

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Current Zoology 2020年第1期66卷 83-90页

作者： Tyrone LUCON-XICCATO Elia GATTO angelo BISAZZA Department of Life Sciences and Biotechnology University of FerraraFerraraItaly Department of General Psychology University of PadovaPadovaItaly

In a number of species,males and females have different ecological roles and therefore might be required to solve different *** on humans have suggested that the 2 sexes often show different efficiencies in problem solving tasks;similarly,evidence of sex differences has been found in 2 other mammalian ***,we assessed whether a teleost fish species,the *** reticulata,displays sex differences in the ability to solve *** Experiment 1,guppies had to learn to dislodge a disc that occluded a feeder from which they had been previously accustomed to *** Experiment 2,guppies had to solve a version of the detour task that required them to learn to enter a transparent cylinder from the open sides to reach a food reward previously freely *** found evidence of sex differences in both problem-solvingi *** Experiment 1,females clearly outperformed males,and in Experiment 2,guppies showed a reversed but smaller sex *** study indicates that sex differences may play an important role in fish's problem-solving similar to what has previously been observed in some mammalian species.

关键词： fish cognition individual differences learning abilities problem solving sex differences

Glycated hemoglobin and antidiabetic strategies as risk factors for hepatocellular carcinoma

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World Journal of Gastroenterology 2010年第24期16卷 3025-3032页

作者： Valter Donadon Massimiliano Balbi Francesca Valent angelo Avogaro Department of Medicine Internal Medicine 3rdPordenone Hospital Institute of Hygiene and Epidemiology Udine University Hospital Department of Clinical and Experimental Medicine Padova University

AIM: To evaluate the relationship between glycemic control [assessed by glycated hemoglobin (HbA1c)], antidiabetic therapies and the risk of hepatocellular carcinoma (HCC).METHODS: We recruited 465 patients with HCC, 618 cases with liver cirrhosis and 490 controls with no liver disease. Among subjects with type 2 diabetes mellitus (DM2), the associations between the antidiabetic strategies and HbA1c level with HCC were determined through 2 series of multivariate logistic regression models using cirrhotic patients and controls as comparison groups. RESULTS: DM2 prevalence was 31.2% in patients with HCC, 23.2% in cirrhotic patients and 12.6% in controls (P < 0.0001). In 86% of study subjects, DM2 had been diagnosed for more than 1 year before the HCC diagnosis. HCC patients with DM2 had a 1.52.5fold increased risk of liver cancer. The HbA1c mean levels were signif icantly higher in DM2 patients with HCC than in cirrhoticand control DM2 patients. Antidiabetic treatment with metformin was more common among cirrhotic and control DM2 subjects than among cases with HCC. In both series of multivariate analyses, treatment with metformin signif icantly reduced the risk of HCC by more than 80% compared with sulphonylureas and insulin therapy. No signif icant differences were seen between sulphonylureas and insulin treatment. Elevated HbA1c levels were positively related to the risk for HCC in diabetic patients, with a 26%50% increase in risk for each 1% increase in HbA1c ***: In patients with preexisting DM2, the risk of HCC is positively associated with poor chronic glycemic control and significantly decreased by metformin therapy.

关键词： Hepatocellular carcinoma Type 2 diabetes mellitus Glycemic control Metformin therapy HbA1c level