ABSTRACT
Objective:To investigate mitochondrial-dependent molecular mechanisms of a novel agonistic anti-human death receptor 5 (DR5) monoclonal antibody(mDRA-6) inducing apoptosis in Jurkat cell.Methods:The dose-dependent and time-dependent cell growth suppression of mDRA-6 in Jurkat cells was determined by MTT assay.The measurement of the mitochondrial transmembrane potential(ΔΨm) of Jurkat cells was detected by flow cytometry with JC-1 single staining.Caspase-8,9 as well as Bid,Bax,Bcl-2 and Cyto c of apoptotic Jurkat cells were analyzed by Western blot after mDRA-6 treatment.Results:The mDRA-6 induced cell growth suppression and cytotoxicity in dose-dependent manner and time-dependent manner.After mDRA-6 treatment at 2.0 μg/ml for15 min,30 min,60 min and 120 min,the change in ΔΨm were 20.14 %,19.34 %,21.11% and 30.90% respectively by JC-1 single staining.Western blot revealed that the level of active fragments of Caspase-8,9 and Bid,Bax,Bcl-2 and Cyto c respectively,and the amount of Cyto c was increased in cytosol concomitant with the related attenuation of Cyto c in mitochondria.Conclusion: Apoptotic pathway of Jurkat cells induced by mDRA-6 is initiated upon DR5 ligatian to mDRA-6 and exogenic Caspase-dependent cell apoptotic cascades is activated,and endogenic mitochondrial-dependent cell apoptosis pathway is activated.mDRA-6 may be a useful agent in investigating human leukemia therapy by using TRAIL/DR5.
ABSTRACT
<p><b>OBJECTIVE</b>To investigate the existence of hemorrhagic fever with renal syndrome (HFRS) foci in high mountains and forest areas.</p><p><b>METHODS</b>A survey was conducted in the areas of 1 400 meter altitude in Dabie mountain and of 1,600 meter altitude in Wannan mountain in the mid 1990's using methods related to epidemiology, geographic-epidemiology, serum epidemiology, pathogenic and molecular epidemiology.</p><p><b>RESULTS</b>Two strains of HFRS viruses were isolated from pulmonary tissues of Rattus niviventer and both of them were identified as A types. The analysis of the nuclei sequence showed that there were significant differences between both sub types and HTN 76-118.</p><p><b>CONCLUSION</b>It was confirmed that there were HFRS foci in the areas with 2 strains possible new sub-types of HFRS.</p>
Subject(s)
Animals , Rats , China , Hantaan virus , Classification , Genetics , Muridae , Virology , Reverse Transcriptase Polymerase Chain Reaction , SerotypingABSTRACT
Objective:The regulatory effects of ethyl acetate extract of Herba Eclipta EAEE on immune function were studied.Methods: The experimental immunosuppressive models were induced by injection of Cyclophosphamide or hydrocortisonc.Results: The index of thymus gland spleen in immunosuppressive mice was increased significantly. when large and small dose of EAEEP were given. EAEE remarkably enhanced the delayed type hypersensitivity in immunosuppressive mice. Conclusions: EAEE possesses notable immunomodulatory action on immune system in mice.