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1Loss of interstitial cells of Cajal network in severe idiopathic gastroparesis显示文摘AIM: To report a case of severe idiopathic gastroparesis in complete absence of Kit-positive gastric interstitial cells of Cajal (ICC). METHODS: Gastric tissue from a patient with severe idiopathic gastroparesis unresponsive to medical treatment and requiring surgery was analyzed by conventional histology and immunohistochemistry. RESULTS: Gastric pacemaker cells expressing Kit receptor had completely disappeared while the local level of stem cell factor, the essential ligand for its development and maintenance, was increased. No signs of cell death were observed in the pacemaker region. CONCLUSION: These results are consistent with the hypothesis that a lack of Kit expression may lead to impaired functioning of ICC. Total gastrectomy proves to be curative.Edda Battaglia Gabrio Bassotti Graziella Bellone Luca Dughera Anna Maria Serra Luigi Chiusa Alessandro Repici Pierroberto Mioli Giorgio Emanuelli 2006World Journal of Gastroenterology2006,12,38:20
2Understanding mechanisms of the pathogenesis of nonalcoholic fatty liver disease显示文摘A central issue in the understanding of the pathogenesis of nonalcoholic fatty liver disease is the problem of the underlying mechanisms which are not fully understood.In the setting of excessive central adiposity,insulin resistance is the major underlying cause of fat accumulation in hepatocytes.Because of the difficulties with human trials,several animal models have been developed for this purpose mainly characterized as follows:genetically disturbed or murine fatty liver,methionine-choline deficient diet fed or murine steatohepatitis,and high-fat or sucrose diet fed models.Although these animal models have provided useful information,none of them accurately reflect genetic,metabolic and biochemical characteristics of the human disease.Metin Basaranoglu Serra Kayacetin Nevin Yilmaz Ertugrul Kayacetin Orhan Tarcin Abdullah Sonsuz 2010World Journal of Gastroenterology2010,16,18:14
3I.31, a new combination of probiotics, improves irritable bowel syndrome-related quality of life显示文摘AIM:To determine the dose-related effects of a novel probiotic combination,I.31,on irritable bowel syndrome(IBS)-related quality of life(IBS-QoL).METHODS:A multicenter,randomized,double-blind,placebo-controlled intervention clinical trial with three parallel arms was designed.A total of 84 patients(53female,31 male;age range 20-70 years)with IBS and diarrhea according to Rome-Ⅲcriteria were randomly allocated to receive one capsule a day for 6 wk containing:(1)I.31 high dose(n=28);(2)I.31 low dose(n=27);and(3)placebo(n=29).At baseline,and 3and 6 wk of treatment,patients filled the IBSQoL,Visceral Sensitivity Index(VSI),and global symptom relief questionnaires.RESULTS:During treatment,IBS-QoL increased in all groups,but this increment was significantly larger in patients treated with I.31 than in those receiving placebo(P=0.008).After 6 wk of treatment,IBS-QoL increased by 18±3 and 22±4 points in the high and the low dose groups,respectively(P=0.041 and P=0.023vs placebo),but only 9±3 in the placebo group.Gutspecific anxiety,as measured with VSI,also showed a significantly greater improvement after 6 wk of treatment in patients treated with probiotics(by 10±2 and14±2 points,high and low dose respectively,P<0.05for both vs 7±1 score increment in placebo).Symptom relief showed no significant changes between groups.No adverse drug reactions were reported following the consumption of probiotic or placebo capsules.CONCLUSION:A new combination of three different probiotic bacteria was superior to placebo in improving IBS-related quality of life in patients with IBS and diarrhea.Vicente Lorenzo-Zú?iga Elba Llop Cristina Suárez Beatriz álvarez Luis Abreu Jordi Espadaler Jordi Serra 2014World Journal of Gastroenterology2014,20,26:13
4Non invasive blood flow measurement in cerebellum detects minimal hepatic encephalopathy earlier than psychometric tests显示文摘AIM: To assess whether non invasive blood flow measurement by arterial spin labeling in several brain regions detects minimal hepatic encephalopathy. METHODS: Blood flow(BF) was analyzed by arterial spin labeling(ASL) in different brain areas of 14 controls, 24 cirrhotic patients without and 16 cirrhotic patients with minimal hepatic encephalopathy(MHE). Images were collected using a 3 Tesla MR scanner(Achieva 3T-TX, Philips, Netherlands). Pulsed ASL was performed. Patients showing MHE were detected using the battery Psychometric Hepatic Encephalopathy Score(PHES) consisting of five tests. Different cognitive and motor functions were also assessed: alterations in selective attention were evaluated using the Stroop test. Patients and controls also performed visuo-motor and bimanual coordination tests. Several biochemical parameters were measured: serum pro-inflammatory interleukins(IL-6 and IL-18), 3-nitrotyrosine, cGMP and nitrates+nitrites in plasma, and blood ammonia. Bivariate correlations were evaluated.RESULTS: In patients with MHE, BF was increased in cerebellar hemisphere(P = 0.03) and vermis(P = 0.012) and reduced in occipital lobe(P = 0.017). BF in cerebellar hemisphere was also increased in patients without MHE(P = 0.02). Bimanual coordination was impaired in patients without MHE(P = 0.05) and much more in patients with MHE(P < 0.0001). Visuo-motor coordination was impaired only in patients with MHE(P < 0.0001). Attention was slightly affected in patients without MHE and more strongly in patients with MHE(P< 0.0001). BF in cerebellar hemisphere and vermis correlated with performance in most tests of PHES [(number connection tests A(NCT-A), B(NCT-B)and line tracing test] and in the congruent task of Stroop test. BF in frontal lobe correlated with NCT-A. Performance in bimanual and visuomotor coordination tests correlated only with BF in cerebellar hemisphere. BF in occipital lobe correlates with performance in the PHES battery and with CFF. BF in cerebellar hemisphere correlates with plasma cGMP and nitric oxide(NO) metabolites. BF in vermis cerebellar also correlates with NO metabolites and with 3-nitrotyrosine. IL-18 in plasma correlates with BF in thalamus and occipital lobe.CONCLUSION: Non invasive BF determination in cerebellum using ASL may detect MHE earlier than the PHES. Altered NO-cGMP pathway seems to be associated to altered BF in cerebellum.Vicente Felipo Amparo Urios Carla Giménez-Garzó Omar Cauli Maria-Jesús Andrés-Costa Olga González Miguel A Serra Javier Sánchez-González Roberto Aliaga Remedios Giner-Durán Vicente Belloch Carmina Montoliu 2014World Journal of Gastroenterology2014,20,33:12
5Risk factors of gastric cancer specific for tumor location and histology in Cali,Colombia显示文摘AIM: To examine histology- and tumor-location specific risk factors of gastric cancer (GC). METHODS: This was a case-control study. The study subjects were 216 GC patients newly diagnosed during the period 2000-2002 and 431 controls selected from non-cancer patients matching in age, gender, and hospital. We obtained information on lifestyles, dietary habits, and others by a questionnaire. RESULTS: The subjects who were not eldest among his/her siblings were at a slightly elevated GC risk (OR 1.3; 95% CI 0.8-2.0). Salting meals before tasting was related to an increased GC risk (OR 3.5; 95% CI 1.6- 7.3). Frequent consumptions of fruits (OR 0.3; 95% CI 0.1-1.0) and vegetables (OR 0.3; 95% CI 0.1-1.0) were related to decreased GC risks. On the other hand, frying foods (OR 1.9; 95% CI 1.0-3.6) and cooking with coal (OR 1.8; 95% CI 1.3-2.6) were related to increased GC risks. Neither Lauren’s histological classification (intestinal and diffuse types) nor tumor location significantly affected those associations except birth order. The subjects who were not eldest among his/her siblings had an increased risk of GCs in the distal and middle thirds, and their ORs were 1.7 (95% CI 1.0-2.8) and 1.9 (95% CI 0.8-4.3), respectively. The corresponding OR in the upper third stomach was 0.3 (95% CI 0.1-0.9). The differences of those three ORs were statistically significant (P = 0.010). CONCLUSION: The present study shows that birth or- der, salt intake, consumption of fruits and vegetables, the type of cooking, and cigarette smoking are related to GC risk. In histology and tumor-location specific analy- ses, non-eldest person among their siblings is related to an increased GC risk in the distal and middle thirds of the stomach, and is related to a decreased GC risk in the cardia.Francia Campos Gabriel Carrasquilla Chihaya Koriyama Mauricio Serra Edwin Carrascal Tetsuhiko Itoh Mitsuharu Nomoto Suminori Akiba 2006World Journal of Gastroenterology2006,12,36:11
6Osteocyte dysfunction promotes osteoarthritis through MMP13-dependent suppression of subchondral bone homeostasis显示文摘Osteoarthritis(OA),long considered a primary disorder of articular cartilage,is commonly associated with subchondral bone sclerosis.However,the cellular mechanisms responsible for changes to subchondral bone in OA,and the extent to which these changes are drivers of or a secondary reaction to cartilage degeneration,remain unclear.In knee joints from human patients with end-stage OA,we found evidence of profound defects in osteocyte function.Suppression of osteocyte perilacunar/canalicular remodeling(PLR)was most severe in the medial compartment of OA subchondral bone,with lower protease expression,diminished canalicular networks,and disorganized and hypermineralized extracellular matrix.As a step toward evaluating the causality of PLR suppression in OA,we ablated the PLR enzyme MMP13 in osteocytes while leaving chondrocytic MMP13 intact,using Cre recombinase driven by the 9.6-kb DMP1 promoter.Not only did osteocytic MMP13 deficiency suppress PLR in cortical and subchondral bone,but it also compromised cartilage.Even in the absence of injury,osteocytic MMP13 deficiency was sufficient to reduce cartilage proteoglycan content,change chondrocyte production of collagen II,aggrecan,and MMP13,and increase the incidence of cartilage lesions,consistent with early OA.Thus,in humans and mice,defects in PLR coincide with cartilage defects.Osteocyte-derived MMP13 emerges as a critical regulator of cartilage homeostasis,likely via its effects on PLR.Together,these findings implicate osteocytes in bone-cartilage crosstalk in the joint and suggest a causal role for suppressed perilacunar/canalicular remodeling in osteoarthritis.Courtney MMazur Jonathon JWoo Cristal SYee Aaron JFields Claire Acevedo Karsyn NBailey Serra Kaya Tristan WFowler Jeffrey CLotz Alexis Dang Alfred CKuo Thomas PVail Tamara Alliston 2019Bone Research2019,7,4:10
7Combined goblet cell carcinoid and mucinous cystadenoma of the vermiform appendix显示文摘Goblet cell carcinoid is an uncommon primary tumor of the vermiform appendix, characterized by dual endocrine and glandular differentiation. Whether goblet cell carcinoid represents a morphological variant of appendiceal classical carcinoid or a mucin-producing adenocarcinoma is a matter of conjecture. Rare cases of goblet cell carcinoid with other concomitant appendiceal epithelial neoplasms have been documented. In this report, we describe a rare case of combined appendiceal goblet cell carcinoid and mucinous cystadenoma, and discuss the possible histopathogenesis of this combination.Khaled O Alsaad Stefano Serra Runjan Chetty 2009World Journal of Gastroenterology2009,15,27:6
8A prospective study on radiofrequency ablation locally advanced pancreatic cancer显示文摘BACKGROUND:Radiofrequency ablation(RFA)has been suggested as a new treatment option for patients with locally advanced cancer.This study aimed to prospectively evaluate the efficacy and safety of intraoperative RFA in patients with unresectable,locally advanced,non-metastatic carcinoma of the pancreatic head.METHODS:RFA was the first step of the surgical procedure and was carried out on the mobilized pancreatic head followed by biliary by-pass and gastrojejunal-anastomosis.Intra-and post-operative morbidity and mortality,performance status, pain control,quality of life,and survival at 24 months were evaluated.RESULTS:Seven patients(3 men and 4 women;median age 66 years,range 47-80 years)were studied and 4 were eligible for treatment.The RFA procedure was carried out in 3 of the 4 patients;in one patient it was not carried out because of the upstaging of the neoplasm.In all 3 patients RFA achieved complete necrosis of the lesion.A biliary fistula developed 7 days after the procedure in one patient;all 3 patients developed ascites 8.6 days(range 7-9 days)on average after RFA.All patients died respectively,at 3,4,and 5 months after the treatment.CONCLUSIONS:In our experience,RFA is a feasible procedure, but it presents a very high rate of postoperative complications.Moreover,pain control,life quality and survival rate are poor.The few data suggest no impact on survival.Riccardo Casadei Claudio Ricci Raffaele Pezzilli Carla Serra Lucia Calculli Antonio Maria Morselli-Labate Donatella Santini Francesco Minni 2010Hepatobiliary & Pancreatic Diseases International2010,9,3:6
9应用工艺智能优化控制系统降低污水厂能耗显示文摘生物工艺智能优化系统(BIOS)是一个前馈优化系统,通过获得A/O工艺实时的在线数据(如氨氮、硝酸盐氮、进水流量、混合液悬浮物浓度),BIOS系统不断进行模拟计算,然后按照生物反应器进水的污染物负荷状况来提供最佳的DO设定值;同时为达到最佳的TN去除率,BIOS系统还对好氧区回流至缺氧区的内回流比(IRQ)进行了优化。BIOS系统在美国康涅狄格州En-field污水厂的实际应用情况表明,该系统能提高脱氮效率36%,同时降低曝气量19%。Wenjun Liu George Lee 尚爱安 M.E. Serra 张超 2006中国给水排水2006,22,16:6
10Intraoperative thromboelastography as a tool to predict postoperative thrombosis during liver transplantation显示文摘BACKGROUND Thromboembolic complications are relatively common causes of increased morbidity and mortality in the perioperative period in liver transplant patients.Early postoperative portal vein thrombosis(PVT,incidence 2%-2.6%)and early hepatic artery thrombosis(HAT,incidence 3%-5%)have a poor prognosis in transplant patients,having impacts on graft and patient survival.In the present study,we attempted to identify the predictive factors of these complications for early detection and therefore monitor more closely the patients most at risk of thrombotic complications.AIM To investigate whether intraoperative thromboelastography(TEG)is useful in detecting the risk of early postoperative HAT and PVT in patients undergoing liver transplantation(LT).METHODS We retrospectively collected thromboelastographic traces,in addition to known risk factors(cold ischemic time,intraoperative requirement for red blood cells and fresh-frozen plasma transfusion,prolonged operating time),in 27 patients,selected among 530 patients(≥18 years old),who underwent their first LT from January 2002 to January 2015 at the Liver University Transplant Center and developed an early PVT or HAT(case group).Analyses of the TEG traces were performed before anesthesia and 120 min after reperfusion.We retrospectively compared these patients with the same number of nonconsecutive control patients who underwent LT in the same study period without developing these complications(1:1 match)(control group).The chosen matching parameters were:Patient graft and donor characteristics[age,sex,body mass index(BMI)],indication for transplantation,procedure details,United Network for Organ Sharing classification,BMI,warm ischemia time(WIT),cold ischemia time(CIT),the volume of blood products transfused,and conventional laboratory coagulation analysis.Normally distributed continuous data are reported as the mean±SD and compared using one-way Analysis of Variance(ANOVA).Nonnormally distributed continuous data are reported as the median(interquartile range)and compared using the Mann-Whitney test.Categorical variables were analyzed with Chi-square tests with Yates correction or Fisher’s exact test depending on best applicability.IBM SPSS Statistics version 24(SPSS Inc.,Chicago,IL,United States)was employed for statistical analysis.Statistical significance was set at P<0.05.RESULTS Postoperative thrombotic events were identified as early if they occurred within 21 d postoperatively.The incidence of early hepatic artery occlusion was 3.02%,whereas the incidence of PVT was 2.07%.A comparison between the case and control groups showed some differences in the duration of surgery,which was longer in the case group(P=0.032),whereas transfusion of blood products,red blood cells,fresh frozen plasma,and platelets,was similar between the two study groups.Thromboelastographic parameters did not show any statistically significant difference between the two groups,except for the G value measured at basal and 120’postreperfusion time.It was higher,although within the reference range,in the case group than in the control group(P=0.001 and P<0.001,respectively).In addition,clot lysis at 60 min(LY60)measured at 120’postreperfusion time was lower in the case group than in the control group(P=0.035).This parameter is representative of a fibrinolysis shutdown(LY60=0%-0.80%)in 85%of patients who experienced a thrombotic complication,resulting in a statistical correlation with HAT and PVT.CONCLUSION The end of surgery LY60 and G value may identify those recipients at greater risk of developing early HAT or PVT,suggesting that they may benefit from intense surveillance and eventually anticoagulation prophylaxis in order to prevent these serious complications after LT.Lesley De Pietri Roberto Montalti Giuliano Bolondi Valentina Serra Fabrizio Di Benedetto 2020World Journal of Transplantation2020,10,11:5
11Biometric and ICL-related risk factors associated to sub-optimal vaults in eyes implanted with implantable collamer lenses显示文摘Background:To identify biometric and implantable collamer lens(ICL)-related risk factors associated with suboptimal postoperative vault in eyes implanted with phakic ICL.Methods:This study reports a retrospective case series of the first operated eye in 360 patients implanted with myopic spherical or toric ICL.Preoperatively,white-to-white(WTW),central keratometry(Kc)and central corneal thickness(CCT)were measured using the Pentacam.Anterior-segment optical coherence tomography(AS-OCT,Visante)was applied preoperatively for measuring the horizontal anterior-chamber angle-to-angle distance(ATA),internal anterior chamber depth(ACD),crystalline lens rise(CLR),anterior-chamber angle(ACA)and postoperatively the vault.Eyes were divided into three vault groups:low(LVG:≤250μm),optimal(OVG:>250 and<1000μm)and high(HVG:≥1000μm).Multinomial logistic regression(MLR)was used to find the sub-optimal vault predictors.Results:MLR showed that CLR,ICL size minus the ATA(ICL size-ATA),age,ICL spherical equivalent(ICLSE)and ICL size as contributing factors for sub-optimal vaults(pseudo-R2=0.40).Increased CLR(OR:1.01,CI:1.00-1.01)and less myopic ICLSE(OR:1.22,CI:1.07-1.40)were risk factors for low vaults.Larger ICL size-ATA(OR:41.29,CI:10.57-161.22)and the 13.7mm ICL(OR:7.08,CI:3.16-15.89)were risk factors for high vaults,whereas less myopic ICLSE(OR:0.85,CI:0.76-0.95)and older age(OR:0.92,CI:0.88-0.98)were protective factors.Conclusion:High CLR and low ICLSE were the major risk factors in eyes presenting low vaults.In the opposite direction,ICL size-ATA was the major contributor for high vaults.This relationship was more critical in higher myopic ICLSE,younger eyes and when 13.7mm ICL were used.The findings show that factors influencing the vault have differentiated weight of influence depending on the type of vault(low,optimal or high).Santiago Cerpa Manito Angel Sánchez Trancón Oscar Torrado Sierra António Manuel Baptista Pedro Miguel Serra 2021Eye and Vision2021,8,1:5
12Catalytic combustion of soot over ceria-zinc mixed oxides catalysts supported onto cordierite显示文摘Modified substrates as outer heterogeneous catalysts was employed to reduce the soot generated from incomplete combustion of diesel or diesel/biodiesel blends, a process that harms the environment and public health. The unique storage properties of ceria(CeO2) makes it one of the most efficient catalysts available to date. Here, we proposed that ceria-based catalysts can lower the temperature at which soot combustion occurs; more specifically, from 610℃ to values included in the diesel exhausts operation range(300–450℃). The sol-gel method was used to synthesize mixed oxide-based catalysts(CeO2:ZnO); the resulting catalysts were deposited onto cordierite substrates. In addition, the morphological and structural properties of the material were evaluated by XRD, BET, TPR-H2, and SEM. Thermogravimetric(TG/DTA) analysis revealed that the presence of the catalyst decreased the soot combustion temperature by 200℃ on average, indicating that the oxygen species arise at low temperatures in this situation, promoting highly reactive oxidation reactions. Comparative analysis of soot emission by diffuse reflectance spectroscopy(DRS) showed that catalyst-impregnated cordierite samples efficiently oxidized soot in a diesel/biodiesel stationary motor: soot emission decreased by more than 70%.Leandro Fontanetti Nascimento Renata Figueredo Martins Rodrigo Ferreira Silva Osvaldo Antonio Serra 2014Journal of Environmental Sciences2014,26,3:5
13Does an association exist between chronic pancreatitis and liver cirrhosis in alcoholic subjects?显示文摘AIM: To study the possible association between chronic pancreatitis (CP) and liver cirrhosis (LC) of alcoholic etiology,after excluding any other causes.METHODS: One hundred and forty consecutive alcoholic patients were subdivided into three groups: CP (n = 53),LC (n = 57),and asymptomatic alcoholic (n = 30).Clinical,biochemical and morphological characteristics,Child-Pugh index,indocyanine green test,and fecal pancreatic elastase-1 test were assessed.RESULTS: In patients with cirrhosis,major clinical manifestations of CP such as pancreatic pain and steatorrhea,as well as imaging alterations of CP such as calcifications,duct dilation and pseudocysts were absent; insulin-dependent diabetes was present in 5.3% of cases,and elastase-1 test was altered in only 7%,and severely altered in none.In patients with CP,clinical characteristics of cirrhosis such as ascites,encephalopathy and gastrointestinal hemorrhage were present in one case,Child-Pugh grade > A in 5.7%,and altered indocyanine green test in 1.9% cases.In asymptomatic alcoholism,there was only a non-coincident alteration of elastase-1 test and indocyanine test in 14.8% and 10%,respectively,but other characteristics of cirrhosis or CP were absent.An inverse correlation (r = -0.746) between elastase-1 test and indocyanine test was found in alcoholic patients.CONCLUSION: There is a scarce coincidence in clinical and morphological alterations among patients with CP or LC of alcoholic etiology,but an inverse correlation between pancreatic and liver function tests.These findings support that these alcoholic diseases evolve in a different manner and have different etiopathogenesis.Luis Aparisi Luis Sabater Juan Del-Olmo Juan Sastre Miguel-Angel Serra Ricardo Campello Daniel Bautista Abdalla Wassel José-Manuel Rodrigo 2008World Journal of Gastroenterology2008,14,40:4
14Long-term outcomes of interventions for radiation-induced xerostomia:A review显示文摘Xerostomia, or dry mouth, is a significant problem affecting quality of life in patients treated with radiation therapy for head and neck cancer. Strategies for reduction of xerostomia burden vary widely, with options including: sialagogue medications, saliva substitutes, acupuncture, vitamins, hyperbaric oxygen,submandibular gland transfer, and acupuncture or associated treatments. In this review, we sought to evaluate long-term outcomes of patients treated with various interventions for radiation-induced xerostomia. A literature search was performed using the terms 'xerostomia' and 'radiation' or 'radiotherapy'; all prospective clinical trials were evaluated, and only studies that reported 1 year follow up were included. The search results yielded 2193 studies, 1977 of which were in English. Of those, 304 were clinical trials or clinical studies. After abstract review, 23 trials were included in the review evaluating the following treatment modalities: pilocarpine(three); cevimeline(one); amifostine(eleven);submandibular gland transfer(five); acupuncture like transcutaneous electrical nerve stimulation(ALTENS)(one); hyperbaric oxygen(one); and acupuncture(one). Pilocarpine, cevimeline, and amifostine have been shown in some studies to improve xerostomia outcomes, at the cost of toxicity. ALTENS has similar efficacy with fewer side effects. Submandibular gland transfer is effective but requires an elective surgery, and thus may not always be appropriate or practical.The use of intensity-modulated radiation therapy, in addition to dose deescalation in select patients, may result in fewer patients with late xerostomia,reducing the need for additional interventions.Sung Jun Ma Charlotte I Rivers Lucas M Serra Anurag K Singh 2019World Journal of Clinical Oncology2019,10,1:4
15Color pref ere nee cool versus warm in nursing homes depends on the expected activity for interior spaces显示文摘This study explores the color preferences of elderly residents of nursing homes based on the expected activities for different rooms,activity rooms,and bedrooms and compares the results with the arousal level induced by each color.Two experime nts were con ducted,one with elderly people living in nursing homes in the Valen cian Comm unity,and the other in a laboratory with virtual reality and physiological markers(i.e.,heart rate variability).I dlviduals assessed six colors in two groups of warm and cool.Results demonstrate that preferences for warm and cool colors depend on the room type.For the activity room,warm colors were preferred over the cool colors by both genders,fitting the higher arousal levels induced by warm versus cool colors.For the bedrooms,cool colors were preferred by both genders,fitting the lower arousal levels induced by cool colors in females and the other models that suggest a U-shaped relation between the arousal level and the visible spectra of colors.Therefore,the color preferences for interior spaces in nursing homes depend on the room type and are related to the arousal level for the expected activity in them.Ana Torres Juan Serra Jorge Llopis Anna Delcampo 2020Frontiers of Architectural Research2020,9,4:4
16Analysis of the in vitro degradation and the in vivo tissue response to bi-layered 3D-printed scaffolds combining PLA and biphasic PLA/bioglass components--Guidance of the inflammatory response as basis for osteochondral regeneration显示文摘The aim of the present study was the in vitro and in vivo analysis of a bi-layered 3D-printed scaffold combining a PLA layer and a biphasic PLA/bioglass G5 layer for regeneration of osteochondral defects in vivo Focus of the in vitro analysis was on the(molecular)weight loss and the morphological and mechanical variations after immersion in SBF.The in vivo study focused on analysis of the tissue reactions and differences in the implant bed vascularization using an established subcutaneous implantation model in CD-1 mice and established histological and histomorphometrical methods.Both scaffold parts kept their structural integrity,while changes in morphology were observed,especially for the PLA/G5 scaffold.Mechanical properties decreased with progressive degradation,while the PLA/G5 scaffolds presented higher compressive modulus than PLA scaffolds.The tissue reaction to PLA included low numbers of BMGCs and minimal vascularization of its implant beds,while the addition of G5 lead to higher numbers of BMGCs and a higher implant bed vascularization.Analysis revealed that the use of a bi-layered scaffold shows the ability to observe distinct in vivo response despite the physical proximity of PLA and PLA/G5 layers.Altogether,the results showed that the addition of G5 enables to reduce scaffold weight loss and to increase mechanical strength.Furthermore,the addition of G5 lead to a higher vascularization of the implant bed required as basis for bone tissue regeneration mediated by higher numbers of BMGCs,while within the PLA parts a significantly lower vascularization was found optimally for chondral regeneration.Thus,this data show that the analyzed bi-layered scaffold may serve as an ideal basis for the regeneration of osteochondral tissue defects.Additionally,the results show that it might be able to reduce the number of experimental animals required as it may be possible to analyze the tissue response to more than one implant in one experimental animal.Mike Barbeck Tiziano Serra Patrick Booms Sanja Stojanovic Stevo Najman Elisabeth Engel Robert Sader Charles James Kirkpatrick Melba Navarro Shahram Ghanaati 2017Bioactive Materials2017,2,4:3
17Hyperplasia vs hypertrophy in tissue regeneration after extensive liver resection显示文摘AIM To address to what extent hypertrophy and hyperplasia contribute to liver mass restoration after major tissue loss. METHODS The ability of the liver to regenerate is remarkable on both clinical and biological grounds. Basic mechanisms underlying this process have been intensively investigated. However, it is still debated to what extent hypertrophy and hyperplasia contribute to liver mass restoration after major tissue loss. We addressed this issue using a genetically tagged system. We were able to follow the fate of single transplanted hepatocytes during the regenerative response elicited by 2/3 partial surgical hepatectomy(PH) in rats. Clusters of transplanted cells were 3D reconstructed and their size distribution was evaluated over time after PH. RESULTS Liver size and liver DNA content were largely recovered 10 d post-PH, as expected(e.g., total DNA/liver/100 gb.w. was 6.37 ± 0.21 before PH and returned to 6.10 ± 0.36 10 d after PH). Data indicated that about 2/3 of the original residual hepatocytes entered S-phase in response to PH. Analysis of cluster size distribution at 24, 48, 96 h and 10 d after PH revealed that about half of the remnant hepatocytes completed at least 2 cell cycles. Average size of hepatocytes increased at 24 h(248.50 μm2 ± 7.82 μm2, P = 0.0015), but returned to control values throughout the regenerative process(up to 10 d post-PH, 197.9 μm2 ± 6.44 μm2, P = 0.11). A sizeable fraction of the remnant hepatocyte population does not participate actively in tissue mass restoration. CONCLUSION Hyperplasia stands as the major mechanism contributing to liver mass restoration after PH, with hypertrophy playing a transient role in the process.Fabio Marongiu Michela Marongiu Antonella Contini Monica Serra Erika Cadoni Riccardo Murgia Ezio Laconi 2017World Journal of Gastroenterology2017,23,10:3
18Orthopaedic care provided by the 14th combat support hospital in support of humanitarian and disaster relief after hurricane Maria in Puerto Rico显示文摘On September 20,2017 Hurricane Maria,a category 4 hurricane,made landfall on the eastern coast of Puerto Rico.This was preceded by Hurricane Irma,a category 5 hurricane,which passed just off the coast 13 d prior.The destruction from both Hurricane Irma and Maria precipitated a coordinated federal response which included the Federal Emergency Management Agency(FEMA)and the United States military.The United States Army dispatched the 14^th Combat Support Hospital(CSH)to Humacao,a city on the eastern side of the island where Maria made landfall.The mission of the 14^th CSH was to provide medical humanitarian aid and conduct disaster relief operations in support of the government of Puerto Rico and FEMA.During the 14^th CSH deployment to Puerto Rico,1157 patients were evaluated and treated.Fifty-seven operative cases were performed to include 23 orthopaedic cases.The mean age of the orthopaedic patients treated was 45.7 years(range 13-76 years).The most common operation was irrigation and debridement of open contaminated and/or infected wounds.Patients presented a mean 10.8 d from their initial injury(range 1-40 d).Fractures and infections were the most common diagnoses with the greatest delay in treatment from the initial date of injury.The deployment of the 14^th CSH to Puerto Rico was unique in its use of air transport,language and local customs encountered,as well as deployment to a location outside the continental United States.These factors coupled with the need for rapid deployment of the 14^th CSH provided valuable experience which will undoubtedly enable future success in similar endeavors.Nathan Lanham Kyle Bockelman Fernando Lopez Marc M Serra Bradford Scanlan 2020World Journal of Orthopedics2020,11,2:2
19ARFI elastography in patients with chronic autoimmune liver diseases: A preliminary study显示文摘S. Righi E. Fiorini C. De Molo V. Cipriano F. Cassani L. Muratori M. Lenzi A.M. Morselli Labate C. Serra 2012Journal of Ultrasound2012,,4:2
20Viroids and Hepatitis Delta Virus显示文摘Ricardo Flores Susana Ruiz-Ruiz Pedro Serra 2012Semin Liver Dis2012,,03:2
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