Objective: To study the effect of active compound 6F and A from Pteris semipinnata L.(PsL) on the activities of DNA topoisomerase (TOPO) I and II, activities of cytosolic and membrane TPK, and expression of oncogene c...Objective: To study the effect of active compound 6F and A from Pteris semipinnata L.(PsL) on the activities of DNA topoisomerase (TOPO) I and II, activities of cytosolic and membrane TPK, and expression of oncogene c-myc in lung adenocarcinoma cells. Methods: The effect of compound 6F and A on activities of cytosolic and membrane TPK was measured by scintillation counting; the effect of compound A on expression of oncogene c-myc was determined by flow cytometry indirect fluorimetry. Results: compound 6F and A could inhibit the activities of TOPO I, and they strongly inhibited the TOPO II in 0.01 mg/L and 10.0 mg/L respectively. Compound A slightly inhibited the activities of membrane TPK, but not the cytosolic one. Compound A could inhibit the expression of oncogene c-myc. Conclusion: Topoisomerases are target of compound 6F and A. Compound A could slightly inhibit the activities of TPK, and showed an inhibitory effect on the expression of oncogene c-myc.展开更多
Objective To investigate the role of tyrosine kinase receptor C（TrkC）,the receptor of neurotrophin-3（NT-3）,in neuroplasticity following spinal cord injury（SCI）.Methods Rats with cord transection were allowed to ...Objective To investigate the role of tyrosine kinase receptor C（TrkC）,the receptor of neurotrophin-3（NT-3）,in neuroplasticity following spinal cord injury（SCI）.Methods Rats with cord transection were allowed to survive for 1,3,7 and 14 d post operation（dpo）.TrkC expressions at lower thoracic levels of the spinal cord and in precentral gyrus of cerebral cortex were investigated.Results TrkC protein levels at both the site of injury（T10-T11） and the neighboring segments（T9 and T12） in the spinal cord decreased significantly at 1-7 dpo,followed by a rapid increase at 14 dpo.The temporal changes in TrkC mRNA expression level showed a similar pattern with that of TrkC protein.In addition,the levels of TrkC protein and mRNA at the site of injury（T10-T11） were significantly higher than those at the neighboring spinal segments（T9 and T12）.Besides,the levels of TrkC protein and mRNA were higher at the rostral segment than at the caudal segment.However,in the motor cortex,TrkC protein was not detected and TrkC mRNA was expressed at a very low level.Conclusion These results suggest that TrkC may be involved in neuroplasticity after SCI.展开更多
基金the National Natural Science Foundation of China (No. 39870900) and the key project grant from Guangdong Province Science and Te
文摘Objective: To study the effect of active compound 6F and A from Pteris semipinnata L.(PsL) on the activities of DNA topoisomerase (TOPO) I and II, activities of cytosolic and membrane TPK, and expression of oncogene c-myc in lung adenocarcinoma cells. Methods: The effect of compound 6F and A on activities of cytosolic and membrane TPK was measured by scintillation counting; the effect of compound A on expression of oncogene c-myc was determined by flow cytometry indirect fluorimetry. Results: compound 6F and A could inhibit the activities of TOPO I, and they strongly inhibited the TOPO II in 0.01 mg/L and 10.0 mg/L respectively. Compound A slightly inhibited the activities of membrane TPK, but not the cytosolic one. Compound A could inhibit the expression of oncogene c-myc. Conclusion: Topoisomerases are target of compound 6F and A. Compound A could slightly inhibit the activities of TPK, and showed an inhibitory effect on the expression of oncogene c-myc.
基金supported by the grants from National Natural Science Foundation of China (No. U0632008)the Key Project of Science and Technology Research Foundation of Guangdong Province,China (No. 2008A030201019,2007-05/06-7005206)+1 种基金the Key Project of Science and Technology Research Foundation of Guangzhou municipality,China (No. 09B52120112,2008A1-E4011-6)the Foundation for Medical and Scientific Technology Research of Guangdong Province,China (No. A2009293)
文摘Objective To investigate the role of tyrosine kinase receptor C（TrkC）,the receptor of neurotrophin-3（NT-3）,in neuroplasticity following spinal cord injury（SCI）.Methods Rats with cord transection were allowed to survive for 1,3,7 and 14 d post operation（dpo）.TrkC expressions at lower thoracic levels of the spinal cord and in precentral gyrus of cerebral cortex were investigated.Results TrkC protein levels at both the site of injury（T10-T11） and the neighboring segments（T9 and T12） in the spinal cord decreased significantly at 1-7 dpo,followed by a rapid increase at 14 dpo.The temporal changes in TrkC mRNA expression level showed a similar pattern with that of TrkC protein.In addition,the levels of TrkC protein and mRNA at the site of injury（T10-T11） were significantly higher than those at the neighboring spinal segments（T9 and T12）.Besides,the levels of TrkC protein and mRNA were higher at the rostral segment than at the caudal segment.However,in the motor cortex,TrkC protein was not detected and TrkC mRNA was expressed at a very low level.Conclusion These results suggest that TrkC may be involved in neuroplasticity after SCI.
