Objective To explore the effects of Sterigmatocystin (ST), Deoxynivalenol (DON) and Aflatoxin G1 (AFG1) on apoptosis of human peripheral blood lymphocytes (HPBLs) in vitro and thus to further elucidate the putative r...Objective To explore the effects of Sterigmatocystin (ST), Deoxynivalenol (DON) and Aflatoxin G1 (AFG1) on apoptosis of human peripheral blood lymphocytes (HPBLs) in vitro and thus to further elucidate the putative roles of these three mycotoxins on human immunosystem. Methods The effects of ST, DON and AFG1 on apoptosis of HPBLs were studied with cell culture, flow cytometric (FCM) DNA analysis and DNA agarose gel electrophoresis. Results DNA agarose gel electrophoresis results showed the characteristic 'ladder' pattern of apoptosis in HPBLs treated with ST, DON and AFG1. Flow cytometric DNA analysis revealed that typical subdiploid peaks of apoptosis in DNA histogram could be seen in all groups treated with the three mycotoxins. Significant time-effect and dose-effect relationships were found between the apoptosis rates and treatment time as well as concentrations of the three mycotoxins. Conclusion ST, DON and AFG1 can induce apoptosis of HPBLs in vitro and may have some negative effects on human immunosystem.展开更多
Fourteen strains of Aspergillus versicolor and 2 strains of A. nidulans were screened for sterigmatocystin (ST) production on a semi-synthetic solid substrate by high performence liquid chromatography (HPLC) analysis....Fourteen strains of Aspergillus versicolor and 2 strains of A. nidulans were screened for sterigmatocystin (ST) production on a semi-synthetic solid substrate by high performence liquid chromatography (HPLC) analysis. Two strains of A. versicolor producing ST at 550.5 mg.kg-1 substrate and 1160.8 mg·kg-1 substrate were selected to inoculate 4 kg solid ST-producing media. After 30 days stationary incubation at 28 ℃ in the dark, 2271.6 mg of pale-yellow needle-shaped crystals were isolated and purified from the culture with a procedure applying column chromatography and recrystallization method. The crystal was proved to be sterigmatocystin by spectroanalysis and some physico-chemical analysis. The purity of the final material obtained were more than 99.9% as shown by HPLC and TLC detection. With this procedure, ST was obtained at about one tenth of its commercial cost展开更多
Aspergillus versicolor was isolated from the gastric juice of patients with chronic stomach diseases in high-risk area of gastric cancer. Mice fed with Aspergillus-inoculated corn flour developed adenocarcinoma of the...Aspergillus versicolor was isolated from the gastric juice of patients with chronic stomach diseases in high-risk area of gastric cancer. Mice fed with Aspergillus-inoculated corn flour developed adenocarcinoma of the lung in 15 of 35 mice (42.9%) and atypical hyperplasia of the glandular stomach in 13 of 35 mice (37.4%). Sterigmatocystin was identified by high performance liquid chromato-graphy (HPLC) and fluorescence spectrophotometry in the extract of Aspergillus-inoculated corn flour. The results suggest that the mycotoxin Sterigmatocystin may play a potential role in carcinogenesis in human.展开更多
Compound A was isolated from endophytic fungus( No.2526) of mangrove Avicennia from the South China Sea. The structure of compound A was elucidated by compr ehensive spectral data and coincided with that of sterigmato...Compound A was isolated from endophytic fungus( No.2526) of mangrove Avicennia from the South China Sea. The structure of compound A was elucidated by compr ehensive spectral data and coincided with that of sterigmatocystin. Compound A s howed a weak cytotoxic activity against Bel-7402 and NCIH-460 in vitro wit h IC 50 96 53×10 -6 and 72 52×10 -6 g/mL respectively. It is the first report on sterigmatocystin that isolated from marine fungus.展开更多
基金This work is supported by Natural Science Foundation of Hebei Province (No.3972537) A Grant from Ministry of Education of China for Young Teachers (HB-016).
文摘Objective To explore the effects of Sterigmatocystin (ST), Deoxynivalenol (DON) and Aflatoxin G1 (AFG1) on apoptosis of human peripheral blood lymphocytes (HPBLs) in vitro and thus to further elucidate the putative roles of these three mycotoxins on human immunosystem. Methods The effects of ST, DON and AFG1 on apoptosis of HPBLs were studied with cell culture, flow cytometric (FCM) DNA analysis and DNA agarose gel electrophoresis. Results DNA agarose gel electrophoresis results showed the characteristic 'ladder' pattern of apoptosis in HPBLs treated with ST, DON and AFG1. Flow cytometric DNA analysis revealed that typical subdiploid peaks of apoptosis in DNA histogram could be seen in all groups treated with the three mycotoxins. Significant time-effect and dose-effect relationships were found between the apoptosis rates and treatment time as well as concentrations of the three mycotoxins. Conclusion ST, DON and AFG1 can induce apoptosis of HPBLs in vitro and may have some negative effects on human immunosystem.
文摘Fourteen strains of Aspergillus versicolor and 2 strains of A. nidulans were screened for sterigmatocystin (ST) production on a semi-synthetic solid substrate by high performence liquid chromatography (HPLC) analysis. Two strains of A. versicolor producing ST at 550.5 mg.kg-1 substrate and 1160.8 mg·kg-1 substrate were selected to inoculate 4 kg solid ST-producing media. After 30 days stationary incubation at 28 ℃ in the dark, 2271.6 mg of pale-yellow needle-shaped crystals were isolated and purified from the culture with a procedure applying column chromatography and recrystallization method. The crystal was proved to be sterigmatocystin by spectroanalysis and some physico-chemical analysis. The purity of the final material obtained were more than 99.9% as shown by HPLC and TLC detection. With this procedure, ST was obtained at about one tenth of its commercial cost
文摘Aspergillus versicolor was isolated from the gastric juice of patients with chronic stomach diseases in high-risk area of gastric cancer. Mice fed with Aspergillus-inoculated corn flour developed adenocarcinoma of the lung in 15 of 35 mice (42.9%) and atypical hyperplasia of the glandular stomach in 13 of 35 mice (37.4%). Sterigmatocystin was identified by high performance liquid chromato-graphy (HPLC) and fluorescence spectrophotometry in the extract of Aspergillus-inoculated corn flour. The results suggest that the mycotoxin Sterigmatocystin may play a potential role in carcinogenesis in human.
文摘Compound A was isolated from endophytic fungus( No.2526) of mangrove Avicennia from the South China Sea. The structure of compound A was elucidated by compr ehensive spectral data and coincided with that of sterigmatocystin. Compound A s howed a weak cytotoxic activity against Bel-7402 and NCIH-460 in vitro wit h IC 50 96 53×10 -6 and 72 52×10 -6 g/mL respectively. It is the first report on sterigmatocystin that isolated from marine fungus.
