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151.
Zorita I Ortiz-Zarragoitia M Soto M Cajaraville MP 《Aquatic toxicology (Amsterdam, Netherlands)》2006,78(Z1):S109-S116
In the present work, mussels (Mytilus edulis) were transplanted into a copper (Cu) gradient in Visnes (Norway) for a period of 3 weeks during November 2003. Sites 1 and 2 showed similar low levels of Cu, site 3 had intermediate Cu levels and site 4 was the most polluted with Cu as confirmed by AAS of digestive gland tissue. Values of lysosomal membrane labilization period were significantly lower at sites 3 and 4 compared to sites 1 and 2. The volume density and size of lysosomes was significantly decreased at site 4. The volume density of neutral lipids was also significantly lower at site 4 compared with the rest of sites. The volume density of lipofuscins showed significantly higher values at sites 2 and 3 compared to the reference site 1. Similar results were obtained regarding bioavailable metal levels measured by autometallography. All together, results are indicative of exocytosis of metal-containing lysosomes and lipofuscins to the digestive tubule lumen in mussels from site 4. In fact, autometallographic metal deposits were detected in digestive tubule lumen, brown cells and stomach in site 4 mussels. In agreement, there was a loss of digestive cells in mussels from site 4 (atrophy of the digestive epithelium) and cell type replacement (diminished volume density of digestive cells and increased volume density of basophilic cells). In conclusion, selected biomarkers indicated that mussels transplanted to sites closest to the Cu mine showed significant differences in metal accumulation pattern and in organization of the digestive gland tissue. Finally, female mussels closest to the Cu mine showed advanced gametogenesis with higher gonad index and vitellogenin-like protein levels than mussels at sites 1 and 2. 相似文献
152.
153.
Altered expression of E-cadherin in hepatocellular carcinoma: correlations with genetic alterations,beta-catenin expression,and clinical features 总被引:13,自引:0,他引:13
Wei Y Van Nhieu JT Prigent S Srivatanakul P Tiollais P Buendia MA 《Hepatology (Baltimore, Md.)》2002,36(3):692-701
E-cadherin is a key cell adhesion protein implicated as a tumor/invasion suppressor in human carcinomas and a binding partner of beta-catenin, which plays a critical role in Wnt signaling and in tumorigenesis. Here we report genetic and expression studies of E-cadherin and beta-catenin in hepatocellular carcinoma (HCC). Immunohistochemical analysis of E-cadherin expression in 37 HCCs and adjacent nontumor tissues revealed important variations among tumor samples, ranging from complete or heterogeneous down-regulation in 35% of cases to marked overexpression in 40% of tumors. Loss of E-cadherin expression was closely associated with loss of heterozygosity (LOH) at the E-cadherin locus and methylation of CpG islands in the promoter region (P <.002), predominantly in hepatitis B virus (HBV)-related tumors (P <.005). No mutation of the E-cadherin gene could be detected in the tumors examined, suggesting the requirement for reversible mechanisms of E-cadherin down-regulation. In most HCCs, including E-cadherin-positive and -negative cases, beta-catenin was strongly expressed at the cell membrane and nuclear accumulation of the protein was correlated with the presence of mutations in the beta-catenin gene itself, but not with E-cadherin loss. At difference with a number of epithelial cancers, vascular invasion was frequently noted in HCCs showing enforced expression of the membranous E-cadherin/beta-catenin complex. In conclusion, these data support the notion that E-cadherin might play diverse and seemingly paradoxic roles in HCC, reflecting specific requirements for tumor growth and spread in the liver environment. 相似文献
154.
Carlos Miguel Chiesa Estomba Jose Angel González García Jon Alexander Sistiaga Suarez Izaskun Thomas Arrizabalaga Ekhiñe Larruscain Sarasola Xabier Altuna Mariezcurrena 《Acta otorrinolaringologica espanola》2018,69(2):99-104
Introduction
Pharyngocutaneous fistula is the most frequent complication after total laryngectomy. Its incidence varies between 9%-25% in post primary total laryngectomy patients, to 14%-57% in salvage laryngectomy post radiotherapy or post chemotherapy + radiotherapy. The pectoralis major myofascial flap (PMMF)is postulated as a useful tool to decrease the incidence of this complication.Materials and method
Retrospective analysis of a group of patients treated by salvage laryngectomy, associated or not with pharyngeal closure reinforcement with PMMF.Results
Twenty patients were included, 18 males (90%) and 2 females (10%), in 10 of whom the PMMF was used. The average age was 66.65 years. Seventeen (85%) had a laryngeal tumour and 3 (15%) had a hypopharyngeal tumour. Eight (80%) patients in the non-PMMF group had postoperative fistula, whereas only 2 (20%) patients in the PMMF group had a fistula during the postoperative period (P = .005). The mean time for fistula closure was significantly shorter in the cases where PMMF flap was used (16 ± 11 days vs. 76.8 ± 67 days, P = .001), as was hospital stay (19. 6 ± 18 days vs. 83.9 ± 77 days, P = .001).Conclusion
The use of PMMF in our series is associated with a lower rate of post salvage laryngectomy fistulas in patients treated primarily by organ preservation protocol for laryngeal/hypopharyngeal cancer. In turn, it promotes local healing by decreasing the mean duration of fistula closure and the mean hospital stay. 相似文献155.
Patricia Diez-Echave Izaskun Martín-Cabrejas Jos Garrido-Mesa Susana Langa Teresa Vezza Jos M. Landete Laura Hidalgo-García Francesca Algieri Melinda J. Mayer Arjan Narbad Ana García-Lafuente Margarita Medina Alba Rodríguez-Nogales María Elena Rodríguez-Cabezas Julio Glvez Juan L. Arqus 《Nutrients》2021,13(6)
Limosilactobacillus reuteri INIA P572 is a strain able to produce the antimicrobial compound reuterin in dairy products, exhibiting a protective effect against some food-borne pathogens. In this study, we investigated some probiotic properties of this strain such as resistance to gastrointestinal passage or to colonic conditions, reuterin production in a colonic environment, and immunomodulatory activity, using different in vitro and in vivo models. The results showed a high resistance of this strain to gastrointestinal conditions, as well as capacity to grow and produce reuterin in a human colonic model. Although the in vitro assays using the RAW 264.7 macrophage cell line did not demonstrate direct immunomodulatory properties, the in vivo assays using a Dextran Sulphate Sodium (DSS)-induced colitic mice model showed clear immunomodulatory and protective effects of this strain. 相似文献
156.
Raimondo G Allain JP Brunetto MR Buendia MA Chen DS Colombo M Craxì A Donato F Ferrari C Gaeta GB Gerlich WH Levrero M Locarnini S Michalak T Mondelli MU Pawlotsky JM Pollicino T Prati D Puoti M Samuel D Shouval D Smedile A Squadrito G Trépo C Villa E Will H Zanetti AR Zoulim F 《Journal of hepatology》2008,49(4):652-657
157.
Carlos Conill Mauricio Vargas Izaskun Valduvieco Pedro L. Fernández Antonio Cardesa Sebastián Capurro 《Clinical & translational oncology》2009,11(2):117-119
We describe a rare case of metastasis to the paranasal sinuses. The lesion had an immunohistochemical (positivity for cytokeratin
20, negativity for cytokeratin 7, overexpression of p53) and in situ hybridisation profile (neither lesions showed deletion for p53) consistent with metastasis from the earlier rectal adenocarcinoma.
The correct typification of intestinal-type neoplasms requires a combination of morphological, immunohistochemical and, sometimes,
molecular analysis. 相似文献
158.
Nuclear Accumulation of Mutated β-Catenin in Hepatocellular Carcinoma Is Associated with Increased Cell Proliferation 总被引:4,自引:0,他引:4
Jeanne Tran Van Nhieu Claire Anglique Renard Yu Wei Daniel Cherqui Elie Serge Zafrani Marie Annick Buendia 《The American journal of pathology》1999,155(3):703-710
Inappropriate activation of the Wnt pathway resulting from beta-catenin gene alterations has recently been implicated in the development of hepatocellular carcinoma (HCC). To explore the in vivo effects of mutated beta-catenin, HCC specimens from 32 patients carrying one or several tumors were screened for somatic mutations in exon 3 of the beta-catenin gene, and the expression and subcellular localization of beta-catenin was studied by immunohistochemistry. Missense mutations or interstitial deletions in beta-catenin exon 3 were detected in 12 of 35 (34%) HCC samples. After immunostaining, most tumors exhibited increased membranous and/or cytoplasmic expression of beta-catenin compared with adjacent nontumoral liver. Strong nuclear accumulation of beta-catenin was observed either focally or uniformly in 15 of 35 (43%) tumor specimens, but not in cirrhotic nodules or dysplastic liver cells in adjacent liver. Aberrant nuclear expression of beta-catenin was significantly associated with the presence of mutations in the beta-catenin gene (P < 0.005). Moreover, nuclear beta-catenin staining correlated significantly with increased Ki-67 proliferative index in tumor (P < 0.001) and seemed to be associated with poor outcome in patients with HCC. In conclusion, our data indicate that activation of the Wnt/beta-catenin pathway in HCC results mainly from somatic mutations in the beta-catenin gene and may promote tumor progression by stimulating tumor cell proliferation. 相似文献
159.
Fernando Alfonso Karlen Adamyan Jean-Yves Artigou Michael Aschermann Michael Boehm Alfonso Buendia Pao-Hsien Chu Ariel Cohen Livio Dei Cas Mirza Dilic Anton Doubell Dario Echeverri Nuray Enç Ignacio Ferreira-González Krzysztof J. Filipiak Andreas Flammer Eckart Fleck Plamen Gatzov Thomas F. Lüscher 《The Egyptian Heart Journal》2017,69(2):89-94
The International Committee of Medical Journal Editors (ICMJE) provides recommendations to improve the editorial standards and scientific quality of biomedical journals. These recommendations range from uniform technical requirements to more complex and elusive editorial issues including ethical aspects of the scientific process. Recently, registration of clinical trials, conflicts of interest disclosure, and new criteria for authorship -emphasizing the importance of responsibility and accountability-, have been proposed. Last year, a new editorial initiative to foster sharing of clinical trial data was launched. This review discusses this novel initiative with the aim of increasing awareness among readers, investigators, authors and editors belonging to the Editors’ Network of the European Society of Cardiology. 相似文献
160.
Jose de Jesus Aceves Buendia Lior Tiroshi Wei‐Hua Chiu Joshua A. Goldberg 《The European journal of neuroscience》2019,49(6):824-833
The widely held view that the pathophysiology of Parkinson's disease arises from an under‐activation of the direct pathway striatal spiny neurons (dSPNs) has gained support from a recently described weakening of the glutamatergic projection from the parafascicular nucleus (PfN) to dSPNs in experimental parkinsonism. However, the impact of the remodeling of the thalamostriatal projection cannot be fully appreciated without considering its impact on cholinergic interneurons (ChIs) that themselves preferentially activate indirect pathway spiny neurons (iSPNs). To study this thalamostriatal projection, we virally transfected with Cre‐dependent channelrhodopsin‐2 (ChR2) the PfN of Vglut2‐Cre mice that were dopamine‐depleted with 6‐hydroxydopamine (6‐OHDA). In parallel, we studied the corticostriatal projection to ChIs in 6‐OHDA‐treated transgenic mice expressing ChR2 under the Thy1 promoter. We found the 6‐OHDA lesions failed to affect short‐term synaptic plasticity or the size of unitary responses evoked optogenetically in either of these projections. However, we found that NMDA‐to‐AMPA ratios at PfN synapses—that were significantly larger than NMDA‐to‐AMPA ratios at cortical synapses—were reduced by 6‐OHDA treatment, thereby impairing synaptic integration at PfN synapses onto ChIs. Finally, we found that application of an agonist of the D5 dopamine receptors on ChIs potentiated NMDA currents without affecting AMPA currents or short‐term plasticity selectively at PfN synapses. We propose that dopamine depletion leads to an effective de‐potentiation of NMDA currents at PfN synapses onto ChIs which degrades synaptic integration. This selective remodeling of NMDA currents at PfN synapses may counter the selective weakening of PfN synapses onto dSPNs in parkinsonism. 相似文献