Résumé
Aplastic anemia(AA) is a bone marrow failure disease in which peripheral blood is reduced in two or three lines.Clinically, patients are at high risk of bleeding and infection, which may endanger their lives in serious cases.Due to the great differences in economic conditions, medical conditions and AA epidemiology in various regions around the world, there are many treatment methods for newly diagnosed, refractory / relapsed AA patients and their curative effects are different.Haploidentical hematopoietic stem cell transplantation, eltrombopag and tacrolimus are the research focuses in recent years.To facilitate clinicians to choose more appropriate treatments, this paper reviews the progress of hematopoietic stem cell transplantation therapy and non-transplantation therapy in patients with AA.
Résumé
Objective It has been reported that Ik6 overexpression is associated with poor outcome of childhood pre-B acute lymphoblastic leukemia and Sup-B15 cell line is Ik6 positive.There were fewer studies on the Sup-B15 in the country,so the aim of this research is to explore chemosensitivity and angiogenic potency of pre-B acute lymphoblastic leukemia cell line Sup-B15 associated with Ik6 positive expression through making a comparison between Sup-B15 and Nalm-6 cell line.Methods The Ik6 mRNA and protein expression were detected by nested reverse transcription polymearse chain reaction and Western blot.The effect of vincristine,daunorubicin,L-asparaginase and dexamethasone on the proliferation of cells was measured by using CCK-8 assay.The migration and invasion of cells were detected by transwell assay and mRNA expression of angiogenesis genes (VEGF,Flt-1,PlGF,IGF-1,Ang1 and Ang2) was measured by real-time PCR.Results No expression of Ik6 was detected in Nalm-6 cell line.Compared with Nalm-6,Sup-B15 cell line had a lower rate of growth.The 4 drugs could inhibit the proliferation of cells in a dose-and time-depen-dence manner.Sup-B15 was more sensitive to daunorubicin,L-asparaginase and dexamethasone,and the folds of respective IC50 value were 9.5,1.1 and 1.5.But Sup-B15 was more resistant to vincristine than Nalm-6.The result of transwell assay showed that less Sup-B15 cells transmigrated to the lower chamber.A significant lower expression level of angiogenesis genes was detected in Sup-B15 cells.Conclusion These findings suggest that Sup-B15 is more sensitive to chemotherapy and less angiogenic compared with Nalm-6.