Activities of carboxylesterase and glutathione S transferase in Anoplophora glabripennis larvae feeding on eight different kinds of poplar trees were tested. The results showed that the activities of the two enzymes w...Activities of carboxylesterase and glutathione S transferase in Anoplophora glabripennis larvae feeding on eight different kinds of poplar trees were tested. The results showed that the activities of the two enzymes were significantly different when the larvae feeding on different poplar trees. The contents of fourteen secondary metabolites in eight kinds of poplar trees were also tested with the method of high pressure liquid chromatography (HPLC). Stepwise regression analysis was carried out to test the relationship between the activities of the enzymes and secondary metabolites of poplar trees. The analysis results demonstrated that the contents of benzoic acid and catechin decreased together with the increase of carboxylesterase activity while the contents of catechol increased, but the content of p hydroxybenzoic acid decreased together with the increasing of glutathione S transferase activity while the content of phenol, coumaric acid, syringic, salicylic acid and salicin in poplar trees increased.展开更多
Glutathione S-transferases(GSTs) are a family of soluble detoxification enzymes which use reduced glutathione(GSH) in conjugation and reduction reactions.Toxic electrophiles,including a variety of carcinogens,are subs...Glutathione S-transferases(GSTs) are a family of soluble detoxification enzymes which use reduced glutathione(GSH) in conjugation and reduction reactions.Toxic electrophiles,including a variety of carcinogens,are substrates for the GSTs and are more easily excreted into bile or urine after conjugation or reduction .The three-dimensional structures of GSTs from several species,including humans,have been determined.GST activity has been found to present in all human tissues,and expression of the various GST isoenzymes differs in degree in the various tissues. Glutathione S-transferases may play a role in the protection of cells against toxic electrophiles and in the resistance to cancer chemotherapeutic agants.The polymorphisms of GSTs genes are one of the important factors that exercise influence on individual susceptibility to cancer.展开更多
文摘Activities of carboxylesterase and glutathione S transferase in Anoplophora glabripennis larvae feeding on eight different kinds of poplar trees were tested. The results showed that the activities of the two enzymes were significantly different when the larvae feeding on different poplar trees. The contents of fourteen secondary metabolites in eight kinds of poplar trees were also tested with the method of high pressure liquid chromatography (HPLC). Stepwise regression analysis was carried out to test the relationship between the activities of the enzymes and secondary metabolites of poplar trees. The analysis results demonstrated that the contents of benzoic acid and catechin decreased together with the increase of carboxylesterase activity while the contents of catechol increased, but the content of p hydroxybenzoic acid decreased together with the increasing of glutathione S transferase activity while the content of phenol, coumaric acid, syringic, salicylic acid and salicin in poplar trees increased.
文摘Glutathione S-transferases(GSTs) are a family of soluble detoxification enzymes which use reduced glutathione(GSH) in conjugation and reduction reactions.Toxic electrophiles,including a variety of carcinogens,are substrates for the GSTs and are more easily excreted into bile or urine after conjugation or reduction .The three-dimensional structures of GSTs from several species,including humans,have been determined.GST activity has been found to present in all human tissues,and expression of the various GST isoenzymes differs in degree in the various tissues. Glutathione S-transferases may play a role in the protection of cells against toxic electrophiles and in the resistance to cancer chemotherapeutic agants.The polymorphisms of GSTs genes are one of the important factors that exercise influence on individual susceptibility to cancer.
