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Ion Roată, Romania

Susman S.,Gustave Roussy Institute of Oncology | Susman S.,Victor Babes University of Medicine and Pharmacy Timisoara | Barnoud R.,Hopital de la Croix Rouge | Bibeau F.,Oncology Institute | And 6 more authors.
Journal of Gastrointestinal and Liver Diseases | Year: 2015

Background & Aims: Despite some recent advances, gastric cancer remains an important cause of death at world level. This indicates an absence of therapeutic options, stemming from the limited understanding of the molecular mechanisms involved in carcinogenesis. Nearly fifty years ago Lauren classified gastric cancers, according to the morphological aspect, as intestinal or diffuse. The phenotype of the cells indicates the presence of different molecular mechanisms, which can be approached in the light of recent data and identified with the help of current techniques. The best described are the germline/somatic mutations or the hypermethylations of the E-cadherin 1 CDH1 gene promotor. Methods. We analyzed 195 gastric tumors,120 intestinal and 75 diffuse type, using immunohistochemistry (tissue microarray TMA method) for pStat3Tyr705, E-cadherin, α-catenin and β-catenin; 985 spots of gastric tumors, distributed on 4 TMA blocks were analyzed. For pStat3Tyr705 we took the nuclear staining into account and for the adhesion molecules, membrane staining. Results. In our study, in the diffuse type gastric cancer, pStat3Tyr705 nuclear expression was statistically significantly increased (p=0.003). Also we observed a decreased expression of the adhesion molecules in the same type of gastric cancer (E-cadherin p<0.0001, α-catenin p<0.0001, β-catenin p<0.0001), suggesting that epithelial-to-mesenchymal transition (EMT) may be involved not only in gastric carcinogenesis, but also in resistance to treatment. Conclusion. The Stat3 role has been recently highlighted in carcinogenesis of the diffuse type of gastric cancer. We found that the morphological features of the diffuse type also suggest the involvement of EMT in this type of gastric cancer. Therefore, targeting the key molecules involved in this process may interfere with EMT process in the diffuse type of gastric cancer. © 2015, Romanian Society of Gastroenterology. All rights reserved.

Tomuleasa C.,Ion Chiricuta Oncology Institute
Romanian journal of internal medicine = Revue roumaine de médecine interne | Year: 2011

Although the treatment for colorectal cancer has seen considerable progress during the past few years, the mortality associated with this type of tumor remains high. This article presents the existing methods of treatment, focusing on the new treatments made possible by the advances in the field of normal and tumor stem cells. Starting from the normal architecture of the colon and the properties of the cells identified in it, we sought to present a few notions concerning these cells which have a direct relevance for both pathology and treatment. The manner in which they divide (symmetrically or asymmetrically) as well as the molecules which control their circulation through the body are just a few examples which are likely to influence the treatment of colorectal cancer in the future.

Zdrenghea M.T.,Ion Chiricuta Oncology Institute | Zdrenghea M.T.,University of Medicine and Pharmacy, Cluj-Napoca | Makrinioti H.,Imperial College London | Makrinioti H.,Medical Research Council and Asthma Center in Allergic Mechanisms of Asthma | And 9 more authors.
Reviews in Medical Virology | Year: 2015

Summary: Activation through different signaling pathways results in two functionally different types of macrophages, the pro-inflammatory (M1) and the anti-inflammatory (M2). The polarization of macrophages toward the pro-inflammatory M1 phenotype is considered to be critical for efficient antiviral immune responses in the lung. Among the various cell types that are present in the asthmatic airways, macrophages have emerged as significant participants in disease pathogenesis, because of their activation during both the inflammatory and resolution phases, with an impact on disease progression. Polarized M1 and M2 macrophages are able to reversibly undergo functional redifferentiation into anti-inflammatory or pro-inflammatory macrophages, respectively, and therefore, macrophages mediate both processes. Recent studies have indicated a predominance of M2 macrophages in asthmatic airways. During a virus infection, it is likely that M2 macrophages would secrete higher amounts of the suppressor cytokine IL-10, and less innate IFNs. However, the interactions between IL-10 and innate IFNs during virus-induced exacerbations of asthma have not been well studied. The possible role of IL-10 as a therapy in allergic asthma has already been suggested, but the divergent roles of this suppressor molecule in the antiviral immune response raise concerns. This review attempts to shed light on macrophage IL-10-IFNs interactions and discusses the role of IL-10 in virus-induced asthma exacerbations. Whereas IL-10 is important in terminating pro-inflammatory and antiviral immune responses, the presence of this immune regulatory cytokine at the beginning of virus infection could impair the response to viruses and play a role in virus-induced asthma exacerbations. © 2014 The Authors.

Crisan R.,University of Medicine and Pharmacy, Cluj-Napoca | Aldea M.,University of Medicine and Pharmacy, Cluj-Napoca | Kacso G.,Ion Chiricuta Oncology Institute
Romanian Journal of Diabetes, Nutrition and Metabolic Diseases | Year: 2013

Background and aims: The objective of this study was to conclude if there are enough scientific evidences to consider metformin as a potential treatment for pancreatic cancer. Material and Method: We performed a systematic search using PubMed and MedlinePlus up to September 2012. Reference list of relevant peer-reviewed literature were hand searched. Ultimately 15 articles were included. Results: Epidemiological studies had revealed that therapy with metformin was associated with 21% reduced risk for all types of malignancies, 31% reduction in overall summary relative risk, the median survival was longer: 16.6 vs. 11.5 months and the risk of death has decreased with 33%. In vitro it was proven that low doses of metformin block the stimulation of DNA synthesis and the growth of human pancreatic cancer cells. Prospective randomized clinical trials to confirm these data were already launched. Conclusions: These results raise the possibility that metformin could improve the poor prognostic of patients suffering from pancreatic cancer. Other clinical trials should confirm this hypothesis. © 2013 ILEX PUBLISHING HOUSE, Bucharest, Roumania.

Orza A.,Babes - Bolyai University | Orza A.,University of Arkansas at Little Rock | Soritau O.,Ion Chiricuta Oncology Institute | Tomuleasa C.,Ion Chiricuta Oncology Institute | And 9 more authors.
International Journal of Nanomedicine | Year: 2013

The low rate of survival for patients diagnosed with glioblastoma may be attributed to the existence of a subpopulation of cancer stem cells. These stem cells have certain properties that enable them to resist chemotherapeutic agents and ionizing radiation. Herein, we show that temozolomide-loaded gold nanostructures are efficient in reducing chemoresistance and destroy 82.7% of cancer stem cells compared with a 42% destruction rate using temozolomide alone. Measurements of in vitro cytotoxicity and apoptosis indicate that combination with gold facilitated the ability of temozolomide, an alkylating drug, to alter the resistance of these cancer stem cells, suggesting a new chemotherapy strategy for patients diagnosed with inoperable recurrent malignant glioma. © 2013 Orza et al, publisher and licensee Dove Medical Press Ltd.

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