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| 1 | Antioxidant properties of glutamine and its role in VEGF-Akt pathways in portal hypertension gastropathy显示文摘AIM: To investigate the effects of glutamine on oxidative/nitrosative stress and the vascular endothelial growth factor (VEGF)-Akt-endothelial nitric oxide synthase (eNOS) signaling pathway in an experimental model of portal hypertension induced by partial portal vein ligation (PPVL). METHODS: Portal hypertension was induced by PPVL. The PPVL model consists of a partial obstruction of the portal vein, performed using a 20 G blunt needle as a guide, which is gently removed after the procedure. PPVL model was performed for 14 d beginning treatment with glutamine on the seventh day. On the fifteenth day, the mesenteric vein pressure was checked and the stomach was removed to test immunoreactivity and oxidative stress markers. We evaluated the expression and the immunoreactivity of proteins involved in the VEGF-Akt-eNOS pathway by Western blotting and immunohistochemical analysis. Oxidative stress was measured by quantification of the cytosolic concentration of thiobarbituric acid reactive substances (TBARS) as well as the levels of total glutathione (GSH), superoxide dismutase (SOD) activity, nitric oxide (NO) production and nitrotyrosine immunoreactivity. RESULTS: All data are presented as the mean ± SE. The production of TBARS and NO was significantly increased in PPVL animals. A reduction of SOD activity was detected in PPVL + G group. In the immunohistochemical analyses of nitrotyrosine, Akt and eNOS, the PPVL group exhibited significant increases, whereas decreases were observed in the PPVL + G group, but no difference in VEGF was detected between these groups. Western blotting analysis detected increased expression of phosphatidylinositol-3-kinase (PI3K), P-Akt and eNOS in the PPVL group compared with the PPVL + G group, which was not observed for the expression of VEGF when comparing these groups. Glutamine administration markedly alleviated oxidative/nitrosative stress, normalized SOD activity, increased levels of total GSH and blocked NO overproduction as well as the formation of peroxynitrite. CONCLUSION: Glutamine treatment demonstrated to reduce oxidative damage but does not reduce angiogenesis induced by PH in gastric tissue, demonstrating a beneficial role for the PI3K-Akt-eNOS pathway. | Camila Marques Francielli Licks Ingrid Zattoni Beatriz Borges Luiz Eduardo Rizzo de Souza Claudio Augusto Marroni Norma Possa Marroni | 2013 | World Journal of Gastroenterology2013，19，28： | 9 |
| 2 | Glutamine prevents oxidative stress in a model of mesenteric ischemia and reperfusion显示文摘AIM: To evaluate preventative effects of glutamine in an animal model of gut ischemia/reperfusion(I/R).METHODS: Male Wistar rats were housed in a controlled environment and allowed access to food and water ad libitum. Twenty male Wistar rats were divided into four experimental groups:(1) control group(control)- rats underwent exploratory laparotomy;(2) control + glutamine group(control-GLU)- rats were subjected to laparotomy and treated intraperitoneally with glutamine 24 and 48 h prior to surgery;(3) I/R group- rats were subjected to occlusion of the superior mesenteric artery for 30 min followed by 15 min of reperfusion; and(4) ischemia/reperfusion + glutamine group(G + I/R)- rats were treated intraperitoneally with glutamine 24 and 48 h before I/R. Local and systemic injuries were determined by evaluating intestinal and lung segments for oxidative stress using lipid peroxidation and the activity of superoxide dismutase(SOD), interleukin-6(IL-6) and nuclear factor kappa beta(NFkB) after mesenteric I/R. RESULTS: Lipid peroxidation of the membrane was increased in the animals subjected to I/R(P < 0.05). However, the group that received glutamine 24 and 48 h before the I/R procedure showed levels of lipid peroxidation similar to the control groups(P < 0.05). The activity of the antioxidant enzyme SOD was decreased in the gut of animals subjected to I/R when compared with the control group of animals not subjected to I/R(P < 0.05). However, the group that received glutamine 24 and 48 h before I/R showed similar SOD activity to both control groups not subjected to I/R(P < 0.05). The mean area of NF-kB staining for each of the control groups was similar. The I/R group showed the largest area of staining for NF-kB. The G + I/R group had the second highest amount of staining, but the mean value was much lower than that of the I/R group(P < 0.05). For IL-6, control and control-GLU groups showed similar areas of staining. The I/R group contained the largest area of IL-6 staining, followed by the G + I/R animals; however, this area was significantly lower than that of the group that underwent I/R without glutamine(P < 0.05). CONCLUSION: These results demonstrate that pretreatment with glutamine prevents mucosal injury and improves gut and lung recovery after I/R injury in rats. | Gilmara Pandolfo Zabot Gustavo Franco Carvalhal Norma Possa Marroni Renata Minuzzo Hartmann Vinícius Duval da Silva Henrique Sarubbi Fillmann | 2014 | World Journal of Gastroenterology2014，20，32： | 7 |
| 3 | Antioxidant and anti-inflammatory action of melatonin in an experimental model of secondary biliary cirrhosis induced by bile duct ligation显示文摘AIM To evaluate the effects of melatonin(Mel) on oxidative stress in an experimental model of bile duct ligation(BDL).METHODS Male Wistar rats(n = 32, weight ± 300 g) were allocated across four groups: CO(sham BDL), BDL(BDL surgery), CO + Mel(sham BDL and Mel administration) and BDL + Mel(BDL surgery and Mel administration). Mel was administered intraperitoneally for 2 wk, starting on postoperative day 15, at a dose of 20 mg/kg.RESULTS Mel was effective at the different standards, reestablishing normal liver enzyme levels, reducing the hepatosomatic and splenosomatic indices, restoring lipoperoxidation and antioxidant enzyme concentrations, reducing fibrosis and inflammation, and thereby reducing liver tissue injury in the treated animals.CONCLUSION The results of this study suggest a protective effect of Mel when administered to rats with secondary biliary cirrhosis induced by BDL. | Josieli Raskopf Colares Elizângela Goncalves Schemitt Renata Minuzzo Hartmann Francielli Licks Mariana do Couto Soares Adriane Dal Bosco Norma Possa Marroni | 2016 | World Journal of Gastroenterology2016，22，40： | 3 |
| 4 | Glutamine prevents oxidative stress in a model of portal hypertension显示文摘AIM To evaluate the protective effects of glutamine in a model of portal hypertension(PH) induced by partial portal vein ligation(PPVL).METHODS Male Wistar rats were housed in a controlled environment and were allowed access to food and water ad libitum. Twenty-four male Wistar rats were divided into four experimental groups:(1) control group(SO)-rats underwent exploratory laparotomy;(2) control + glutamine group(SO + G)-rats were subjected to laparotomy and were treated intraperitoneally with glutamine;(3) portal hypertension group(PPVL)-rats were subjected to PPVL; and(4) PPVL + glutamine group(PPVL + G)-rats were treated intraperitoneally with glutamine for seven days. Local injuries were determined by evaluating intestinal segments for oxidative stress using lipid peroxidation and the activities of glutathione peroxidase(GPx), endothelial nitric oxide synthase(e NOS) and inducible nitric oxide synthase(i NOS) after PPVL.RESULTS Lipid peroxidation of the membrane was increased in the animals subjected to PH(P < 0.01). However, the group that received glutamine for seven days after the PPVL procedure showed levels of lipid peroxidation similar to those of the control groups(P > 0.05). The activity of the antioxidant enzyme GTx was decreased in the gut of animals subjected to PH compared with that in the control group of animals not subjected to PH(P < 0.01). However, the group that received glutamine for seven days after the PPVL showed similar GTx activity to both the control groups not subjected to PH(P > 0.05). At least 10 random, non-overlapping images of each histological slide with 200 × magnification(44 pixel = 1 μm) were captured. The sum means of all áreas, of each group were calculated. The mean areas of e NOS staining for both of the control groups were similar. The PPVL group showed the largest area of staining for e NOS. The PPVL + G group had the second highest amount of staining, but the mean value was much lower than that of the PPVL group(P < 0.01). For i NOS, the control(SO) and control + G(SO + G) groups showed similar areas of staining. The PPVL group contained the largest area of i NOS staining, followed by the PPVL + G group; however, this area was significantly smaller than that of the group that underwent PH without glutamine(P < 0.01).CONCLUSION Treatment with glutamine prevents gut mucosal injury after PH in rats. | Gilmara Pandolfo Zabot Gustavo Franco Carvalhal Norma Possa Marroni Francielli Licks Renata Minuzzo Hartmann Vinícius Duval da Silva Henrique Sarubbi Fillmann | 2017 | World Journal of Gastroenterology2017，23，25： | 3 |
| 5 | N-acetylcysteine modulates angiogenesis and vasodilation in stomach such as DNA damage in blood of portal hypertensive rats显示文摘AIM: To evaluate the antioxidant effect of N-acetylcysteine(NAC) on the stomach of rats with portal hypertension.METHODS: Twenty-four male Wistar rats weighing ± 250 g were divided into four experimental groups(n =6 each): Sham-operated(SO),SO + NAC,partial portal vein ligation(PPVL),and PPVL + NAC. Treatment with NAC in a dose of 10 mg/kg(i.p.) diluted in 0.6 m L of saline solution was administered daily for 7 d starting 8 d after the surgery. Animals from the PPVL and SO group received saline solution(0.6 m L) for the same period of time as the PPVL + NAC and SO + NAC group. On the 15 th day the animals were anesthetized and we evaluated portal pressure by cannulating mesenteric artery. After,we removed the stomach for further analysis. We performed immunohistochemical analysis for endothelial nitric oxide synthase(e NOS),vascular endothelial growth factor(VEGF),and nitrotirosine(NTT) proteins in stomach. We also evaluated e NOS and VEGF by Western blot analysis and assessed DNA damage in blood samples by the comet assay.RESULTS: The portal hypertension group exhibited increases in portal pressure when compared to SO group(29.8 ± 1.8 vs 12.0 ± 0.3 mm Hg)(P < 0.001). The same was observed when we compared the e NOS(56.8 ± 3.7 vs 13.46 ± 2.8 pixels)(P < 0.001),VEGF(34.9 ± 4.7 vs 17.46 ± 2.6 pixels)(P < 0.05),and NTT(39.01 ± 4.0 vs 12.77 ± 2.3 pixels)(P < 0.05) expression by immunohistochemistry of the PPVL animals with the SO group. The expression of e NOS(0.39 ± 0.03 vs 0.25 ± 0.03 a.μ)(P < 0.01) and VEGF(0.38 ± 0.04 vs 0.26 ± 0.04 a.μ)(P < 0.01) were also evaluated by Western blot analysis,and we observed an increase of both proteins on PPVL animals. We also evaluated the DNA damage by comet assay,and observed an increase on damage index and damage frequency on those animals. NAC decreased portal pressure values in PPVL + NAC animals(16.46 ± 2 vs 29.8 ± 1.8 mm Hg)(P < 0.001) when compared to PPVL. The expression of e NOS(14.60 ± 4.1 vs 56.8 ± 3.7 pixels)(P < 0.001),VEGF(19.53 ± 3.2 vs 34.9 ± 4.7 pixels)(P < 0.05) and NTT(21.84 ± 0.7 vs 39.01 ± 4.0 pixels)(P < 0.05) evaluated by immunohistochemistry were also reduced in PPVL + NAC animals. Also,when evaluated by Western blot e NOS expression(0.32 ± 0.03 vs 0.39 ± 0.03 a.μ)(P < 0.05) and VEGF expression(0.31 ± 0.09 vs 0.38 ± 0.04 a.μ)(P < 0.01). Furthermore,NAC modulated DNA damage in PPVL + NAC animals.CONCLUSION: In view of these results,we believe NAC is able to protect the stomach from the alterations induced by the PPVL procedure. | Francielli Licks Renata Minuzzo Hartmann Camila Marques Elizangela Schemitt Josieli Raskopf Colares Mariana do Couto Soares Juliana Reys Camila Fisher Juliana da Silva Norma Possa Marroni | 2015 | World Journal of Gastroenterology2015，21，43： | 2 |
| 6 | Effects of Rho-kinase inhi-bition in lung tissue with chronic inflammation 显示文摘 | Righetti RF Pigati PA Possa SS | 2014 | Respir Physiol Neurobiok2014，192，： | 1 |
| 7 | Implementation of a guideline for physical therapy in the postoperative period of upper abdominal surgery reduces the incidence of atelectasis and length of hospital stay显示文摘 | Souza Possa S Braga Amador C Meira Costa A | 2014 | Revista Portuguesa de Pneumologia (English Edition)2014，20，2： | 1 |
| 8 | Tumour angiogenesis : a new significant and in dependent prognostic in dicator in early stage breast carcinoma显示文摘 | Weidner N Folkman J Possa F | 1992 | J Natl Cancer I nst1992，84，24： | 1 |
| 9 | DiscovJ ering search engine related query using association rules 显示文摘 | Fonseca B M Golgher P B Moura E S de Possas B Ziviani N | 2004 | Journal of Web Engineering2004，2，4： | 1 |
| 10 | A multi-resolution FPCA-based architecture for real-time edge and corner detection 显示文摘 | POSSA P R MAHMOUDI S A HARB N | 2013 | IEEE Transactions on Computers2013，63，8： | 1 |
| 11 | Diabetes Mellitus and Anal Sphincter Pressures: An Experimental Model in Rats显示文摘 | Henrique Sarubbi Fillmann M.D. Suzana Llessuy Ph.D. Cláudio A. Marroni M.D. Ph.D. Lúcio S. Fillmann M.D. Ph.D. Norma Possa Marroni Ph.D | 2007 | Diseases of the Colon & Rectum2007，，4： | 1 |
| 12 | Y-27632 is associated with corticosteroid- potentiated control of pulmonary remodeling and inflammation in guinea pigs with chronic allergic inflammation显示文摘 | Pigati PA Righetti RF Possa SS | 2015 | BMC Pulmonary Medicine2015，15，： | 1 |
| 13 | An Evolutionary Approach to Technological Innovation in Agriculture- some preliminary remarks 显示文摘 | Mario Luiz Possas Sergio Salles - Filho Jos Maria da Silveira | 1996 | Research Policy1996，25，6： | 1 |
| 14 | Rho-kinase in- hibition attenuates airway responsiveness, inflammation, matrix remodeling, and oxidative stress activation induced by chronic in- flammation 显示文摘 | Possa SS Charafeddine HT Righetti RF | 1920 | Society for promoting Christian knowledge1920，303，11： | 1 |
| 15 | Quercetin prevents oxidative stress in cirrhotic rats显示文摘 | Amalia P M Possa M N Augusto M C | 2007 | Dig Dis Sci2007，52，10： | 1 |
| 16 | Rho-kinase inhibition attenuates airway responsiveness, inflammation, matrix remodeling, and oxidative stress activation induced by chronic inflammation 显示文摘 | Possa SS Charafeddine HT Righetti RF | 2012 | 303(11):L939-9522012，303，11： | 1 |
| 17 | Modeling classification in small-diameter hydrocyclones under variable rheological conditions显示文摘 | L.M Tavares L.L.G Souza J.R.B Lima M.V Possa | 2002 | Minerals Engineering2002，，8： | 1 |
| 18 | Rho-kinase inhi bition attenuates airway responsiveness, inflammation, matrix remodeling, and oxidative stress activation induced by chronic in- flammation显示文摘 | Possa SS Charafeddine HT Righetti RF | 2012 | Am J Physiol Lung Cell Mol Physiol2012，303，11： | 1 |
| 19 | Partial splenecto- my for splenic cyst using a bipolar radiofrequency device显示文摘 | Possa HPAM Daryanania D Klaasea JM | 2009 | Gastroenterology Research2009，2，： | 1 |
| 20 | Set- based vector model: An efficient approach for correlation based ranking 显示文摘 | Possas B Ziviani N Meira W Ribeiro-Neto B | 2005 | ACM Transactions on Information Systems2005，23，4： | 1 |
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