AIM： To investigate the effect of polaprezinc on cellular damage induced by hydrogen peroxide （H202） in human colon CaCo2 cells. METHODS： CaCo2 cells were treated with polaprezinc （10-100 pmol/L） for 6 h. After ...AIM： To investigate the effect of polaprezinc on cellular damage induced by hydrogen peroxide （H202） in human colon CaCo2 cells. METHODS： CaCo2 cells were treated with polaprezinc （10-100 pmol/L） for 6 h. After polaprezinc treatment, the cells were incubated with H202 （20μmol/L） for 1 h. Cell viability was measured by MTT assay. Western blot analysis for heat shock protein （HSP） 27 and HSP72 in the cells was performed. Moreover, cells were pretreated with quercetin （200 μmol/L）, an inhibitor of HSP synthesis, 2 h before polaprezinc treatment, and cell viability and the expression of HSP27 and 72 were assessed in these cells. RESULTS： Polaprezinc significantly protected CaCo2 cells from cell damage induced by H2O2, and up-regulated the expressions of HSP27 and HSP72 in the cells （10, 30 and 100 pmol/L of polaprezinc; 35.0% ± 7.7%, 58.3% ± 14.6% and 64.2% ± 8.2%, respectively. P 〈 0.01 versus polaprezinc-nontreated cells; 6.0% ± 4.4%）. Quercetin inhibited the up-regulation of HSP27 and HSP72 by polaprezinc and diminished the protective effect of polaprezinc against H2O2-caused injury in the cells. CONCLUSION： Polaprezinc is a useful therapeutic agent for treatment of colitis and its effects depend on the function of cytoprotective HSP in colon.展开更多
BACKGROUND Helicobacter pylori(H.pylori)infection is a worldwide problem with increasing burden on the health sector due to its increasing rate of resistance.The conventional triple therapy(TT)is becoming obsolete wit...BACKGROUND Helicobacter pylori(H.pylori)infection is a worldwide problem with increasing burden on the health sector due to its increasing rate of resistance.The conventional triple therapy(TT)is becoming obsolete with a high failure rate of eradication,necessitating the need for better alternatives or regimens.AIM To investigate H.pylori eradication rate of TT vs modified bismuth quadruple therapy.METHODS Ninety-two patients with dyspepsia symptoms and positive ^(13)C-urea breath test were randomly assigned to two groups.The first group(control group)was treated for 14 d using standard TT protocol:Esomeprazole(40 mg twice daily),amoxicillin(1 g twice daily)and clarithromycin(500 mg twice daily).On the other hand,the second group was prescribed a 10-d course of modified bismuth quadruple therapy fortified with zinc carnosine:TT in addition to bismuth subcitrate(240 mg twice daily)and zinc carnosine(75 mg twice daily).A repeated 13C-urea breath test was done 4 wk after the completion of the eradication therapy.RESULTS Among the 92 subjects,67.4%were males and 32.6%were females.There were no differences in demographic characteristics(age,body mass index,smoking history,previous antibiotics use and ethnicity)between the modified bismuth quadruple therapy group and TT group.The eradication rate was higher[93.5%(43/46)]in the modified bismuth quadruple therapy group compared to 69.6%(32/46)in the standard TT group(P=0.003).Of the tested predictor variables,only nationality,smoking and therapy type were statistically significant.Besides dizziness,which was recorded in modified bismuth quadruple therapy group,there were no significant differences in side effects between the two groups.CONCLUSION Ten days of modified bismuth quadruple therapy fortified with zinc carnosine is superior to 14 d of conventional TT in eradicating H.pylori infection,with no additional significant adverse events.展开更多
基金Supported by the Grant-in-Aid for research, No.18590665 from the Ministry of Education, Science and Culture of Japan
文摘AIM： To investigate the effect of polaprezinc on cellular damage induced by hydrogen peroxide （H202） in human colon CaCo2 cells. METHODS： CaCo2 cells were treated with polaprezinc （10-100 pmol/L） for 6 h. After polaprezinc treatment, the cells were incubated with H202 （20μmol/L） for 1 h. Cell viability was measured by MTT assay. Western blot analysis for heat shock protein （HSP） 27 and HSP72 in the cells was performed. Moreover, cells were pretreated with quercetin （200 μmol/L）, an inhibitor of HSP synthesis, 2 h before polaprezinc treatment, and cell viability and the expression of HSP27 and 72 were assessed in these cells. RESULTS： Polaprezinc significantly protected CaCo2 cells from cell damage induced by H2O2, and up-regulated the expressions of HSP27 and HSP72 in the cells （10, 30 and 100 pmol/L of polaprezinc; 35.0% ± 7.7%, 58.3% ± 14.6% and 64.2% ± 8.2%, respectively. P 〈 0.01 versus polaprezinc-nontreated cells; 6.0% ± 4.4%）. Quercetin inhibited the up-regulation of HSP27 and HSP72 by polaprezinc and diminished the protective effect of polaprezinc against H2O2-caused injury in the cells. CONCLUSION： Polaprezinc is a useful therapeutic agent for treatment of colitis and its effects depend on the function of cytoprotective HSP in colon.
文摘BACKGROUND Helicobacter pylori(H.pylori)infection is a worldwide problem with increasing burden on the health sector due to its increasing rate of resistance.The conventional triple therapy(TT)is becoming obsolete with a high failure rate of eradication,necessitating the need for better alternatives or regimens.AIM To investigate H.pylori eradication rate of TT vs modified bismuth quadruple therapy.METHODS Ninety-two patients with dyspepsia symptoms and positive ^(13)C-urea breath test were randomly assigned to two groups.The first group(control group)was treated for 14 d using standard TT protocol:Esomeprazole(40 mg twice daily),amoxicillin(1 g twice daily)and clarithromycin(500 mg twice daily).On the other hand,the second group was prescribed a 10-d course of modified bismuth quadruple therapy fortified with zinc carnosine:TT in addition to bismuth subcitrate(240 mg twice daily)and zinc carnosine(75 mg twice daily).A repeated 13C-urea breath test was done 4 wk after the completion of the eradication therapy.RESULTS Among the 92 subjects,67.4%were males and 32.6%were females.There were no differences in demographic characteristics(age,body mass index,smoking history,previous antibiotics use and ethnicity)between the modified bismuth quadruple therapy group and TT group.The eradication rate was higher[93.5%(43/46)]in the modified bismuth quadruple therapy group compared to 69.6%(32/46)in the standard TT group(P=0.003).Of the tested predictor variables,only nationality,smoking and therapy type were statistically significant.Besides dizziness,which was recorded in modified bismuth quadruple therapy group,there were no significant differences in side effects between the two groups.CONCLUSION Ten days of modified bismuth quadruple therapy fortified with zinc carnosine is superior to 14 d of conventional TT in eradicating H.pylori infection,with no additional significant adverse events.
