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Homoharringtonine induces apoptosis of endothelium and down-regulates VEGF expression of K562 cells
引用本文:Ye XJ,Lin MF. Homoharringtonine induces apoptosis of endothelium and down-regulates VEGF expression of K562 cells[J]. 浙江大学学报(自然科学英文版), 2004, 5(2): 230-234
作者姓名:Ye XJ  Lin MF
作者单位:DepartmentofHematology,theFirstAffiliatedHospital,MedicalCollege,ZhejiangUniversity,Hangzhou310003,China
摘    要:Homoharringtonine (HHT) has currently been used successfully in the treatment of acute and chronic myeloid leukemias and has been shown to induce apoptosis of different types of leukemic cells in vitro. Emerging evidence suggests that angiogenesis may play an important role in hematological malignancies, such as leukemia. However, whether HHT can relieve leukemia by anti-angiogenesis is still unknown. We investigated the anti-angiogenesis potential of HHT with the human umbilical vein endothelial cell line (ECV304) and leukemic cell line (K562) in vitro. Cellular proliferation was determined by MTT assay and apoptosis was analyzed by flow cytometry, The mRNA expression of vascular endothelial growth factor (VEGF) was assessed by RT-PCR and VEGF protein production was detected by Western blot. Inhibition of cell proliferation and induction of apoptosis by HHT were discovered in ECV304 cells, and appeared in a dose- and time-dependent manner, Also, treatment with HHT caused down-regulation of VEGF mRNA expression in K562 cells in similar dose- and time-dependent manner and inhibition of VEGF protein production in K562 cells in response to the enhancing concentration of HHT. The results demonstrated that HHT could also induce apoptosis in endothelium and down-regulate VEGF expression in K562 cells. In conclusion, we believe HHT has anti-angiogenesis potential and speculate that HHT might exert its anti-leukemia effects via reduction of angiogenesis.

关 键 词:高三尖杉酯碱 HHT 慢性白血病 血管内皮生长因子 VEGF

Homoharringtonine induces apoptosis of endothelium and down-regulates VEGF expression of K562 cells
Ye Xiu-jin,Lin Mao-fang. Homoharringtonine induces apoptosis of endothelium and down-regulates VEGF expression of K562 cells[J]. Journal of Zhejiang University Science, 2004, 5(2): 230-234
Authors:Ye Xiu-jin  Lin Mao-fang
Affiliation:Department of Hematology, the First Affiliated Hospital, Medical College, Zhejiang University, Hangzhou 310003, China.
Abstract:Homoharringtonine (HHT) has currently been used successfully in the treatment of acute and chronic myeloid leukemias and has been shown to induce apoptosis of different types of leukemic cells in vitro. Emerging evidence suggests that angiogenesis may play an important role in hematological malignancies, such as leukemia. However, whether HHT can relieve leukemia by anti-angiogenesis is still unknown. We investigated the anti-angiogenesis potential of HHT with the human umbilical vein endothelial cell line (ECV304) and leukemic cell line (K562) in vitro. Cellular proliferation was determined by MTT assay and apoptosis was analyzed by flow cytometry. The mRNA expression of vascular endothelial growth factor (VEGF) was assessed by RT-PCR and VEGF protein production was detected by Western blot. Inhibition of cell proliferation and induction of apoptosis by HHT were discovered in ECV304 cells, and appeared in a dose- and time-dependent manner. Also, treatment with HHT caused down-regulation of VEGF mRNA expression in K562 cells in similar dose- and time-dependent manner and inhibition of VEGF protein production in K562 cells in response to the enhancing concentration of HHT. The results demonstrated that HHT could also induce apoptosis in endothelium and down-regulate VEGF expression in K562 cells. In conclusion, we believe HHT has anti-angiogenesis potential and speculate that HHT might exert its anti-leukemia effects via reduction of angiogenesis.
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