Objective To study the expression of p16, cyclin D1, Rb and phosphorylated Rb(Ser795) in the esophageal squamous cell carcinoma. Methods Immunohistochemistry was performed and analysed on 34 cases of paraffin-embedded...Objective To study the expression of p16, cyclin D1, Rb and phosphorylated Rb(Ser795) in the esophageal squamous cell carcinoma. Methods Immunohistochemistry was performed and analysed on 34 cases of paraffin-embedded tissues. Results The expression of phosphorylated Rb(Ser795) was positively correlated to that of cyclin D1 (r= 0.401, P= 0.021) and inversely to that of p16 (r= -0.348, P= 0.044). In stepwise regression and the best subset regression, the expression of p16 (P=0.034) and phosphorylated Rb(Ser795) (P= 0.030) were the only determinants of the mitotic index. Conclusion The expression of phosphorylated Rb(Ser795) could be considered as a mark of the interaction between p16 and cyclin D1. The detection of phosphorylated Rb, p16 and cyclin D1 will be possibly helpful to the oncogenesis investigation on the esophageal carcinoma.展开更多
Disinfection by-products occur widely as the unintended effect of water disinfection and are associated with toxicity and adverse human health effects. Yet the molecular mechanisms of their toxicity are not well under...Disinfection by-products occur widely as the unintended effect of water disinfection and are associated with toxicity and adverse human health effects. Yet the molecular mechanisms of their toxicity are not well understood. To investigate the molecular basis of hyperploidy induction by monohaloacetonitriles, the interaction of monohaloacetonitriles with topoisomerase Ⅱ in Chinese hamster ovary cells was examined. We showed a concentration-dependent inhibition of DNA decatenation activity of topoisomerase under acellular conditions while in vitro monohaloacetonitrile treatment expressed mixed results. The working hypothesis, that topoisomerase Ⅱ is a molecular target of monohaloacetonitriles, was only partially supported.Nevertheless, this research serves as a starting point toward molecular mechanisms of toxic action of monohaloacetonitriles.展开更多
文摘Objective To study the expression of p16, cyclin D1, Rb and phosphorylated Rb(Ser795) in the esophageal squamous cell carcinoma. Methods Immunohistochemistry was performed and analysed on 34 cases of paraffin-embedded tissues. Results The expression of phosphorylated Rb(Ser795) was positively correlated to that of cyclin D1 (r= 0.401, P= 0.021) and inversely to that of p16 (r= -0.348, P= 0.044). In stepwise regression and the best subset regression, the expression of p16 (P=0.034) and phosphorylated Rb(Ser795) (P= 0.030) were the only determinants of the mitotic index. Conclusion The expression of phosphorylated Rb(Ser795) could be considered as a mark of the interaction between p16 and cyclin D1. The detection of phosphorylated Rb, p16 and cyclin D1 will be possibly helpful to the oncogenesis investigation on the esophageal carcinoma.
基金supported by NSF STC Water CAMPWS (Award CTS-0120978)the U.S.EPA STAR Grant R834867funded in part by the U.S.Environmental Protection Agency's STAR program
文摘Disinfection by-products occur widely as the unintended effect of water disinfection and are associated with toxicity and adverse human health effects. Yet the molecular mechanisms of their toxicity are not well understood. To investigate the molecular basis of hyperploidy induction by monohaloacetonitriles, the interaction of monohaloacetonitriles with topoisomerase Ⅱ in Chinese hamster ovary cells was examined. We showed a concentration-dependent inhibition of DNA decatenation activity of topoisomerase under acellular conditions while in vitro monohaloacetonitrile treatment expressed mixed results. The working hypothesis, that topoisomerase Ⅱ is a molecular target of monohaloacetonitriles, was only partially supported.Nevertheless, this research serves as a starting point toward molecular mechanisms of toxic action of monohaloacetonitriles.
