真性红细胞增多症患者骨髓CD34阳性细胞凋亡相关蛋白的表达

目的　了解真性红细胞增多症 (PV)患者骨髓CD34 细胞凋亡受体FAS(CD95 )及凋亡相关蛋白Bcl 2、Bax的表达。方法　应用双色流式细胞仪检测 2 1例PV患者及 8例原发性血小板增多症(ET)患者和 11名正常人骨髓CD34 细胞CD95、Bcl 2、Bax的表达 ;应用RT PCR方法检查PV患者及对照组骨髓造血细胞Bcl 2、BaxmRNA的表达情况并分析其相关性。结果　CD34 细胞CD95表达率PV患者为 (4 2 .6 5± 15 .5 6 ) % ,ET患者为 (4 5 .31± 17.6 2 ) % ,与正常对照组的 (37.5 5± 15 .19) %差异无显著性 (P >0 .0 5 ) ;Bax表达率PV患者为 (35 .83± 9.33) % ,与正常对照组的 (4 1.6 5± 9.0 4 ) %差异无显著性(P >0 .0 5 ) ;Bcl 2表达率PV患者为 (79.35± 14 .4 3) % ,明显高于正常对照组的 (5 5 .84± 13.4 3) % ,(P <0 .0 1) ;Bax/Bcl 2的比值PV患者为 0 .4 7± 0 .14 ,明显低于正常对照组的 0 .76± 0 .2 4 (P <0 .0 1) ;骨髓造血细胞Bcl 2mRNA的表达PV患者明显高于正常对照组 (P <0 .0 1) ,BaxmRNA的表达PV患者与正常对照组差异无显著性 (P >0 .0 5 )。PV患者CD34 细胞Bcl 2高表达与CD34 细胞的凋亡呈负相关 (r=- 0 .4 97,P =0 .0 2 6 )。结论　PV患者骨髓CD34 细胞低凋亡的机制之一是抗凋亡蛋白Bcl 2高表达

Expression of apoptosis related proteins in CD34 positive bone marrow cells of patients with polycythemia vera

OBJECTIVE: To investigate the expression of apoptosis receptor FAS (CD95) and apoptosis related protein Bcl-2 and Bax in CD34 positive bone marrow cells of the patients with polycythemia vera (PV). METHODS: The expressions of apoptosis receptor FAS (CD95) and apoptosis related protein Bcl-2 and Bax in bone marrow CD34(+) cells from 21 PV patients, 8 essential thrombocythemia (ET) and 11 normal persons were assessed by bicolor flow cytometry (FCM), and the expressions of Bcl-2 and Bax mRNA were assessed by RT-PCR, and their correlation was analysed. RESULTS: There was no difference between the expressions of CD95 in CD34(+) bone marrow cells of PV patients (42.65 +/- 15.56)%, and that of ET patients (45.31 +/- 17.62)% and of normal person (37.55 +/- 15.19)% (P > 0.05). There was no difference between the expression of Bax in CD34(+) bone marrow cells of PV patients (35.83 +/- 9.33)% and of normal persons (41.65 +/- 9.04)% (P > 0.05). The expression of Bcl-2 in CD34(+) bone marrow cells of PV patients (79.35 +/- 14.43)% was significantly higher than that of normal controls (55.84 +/- 13.43)% (P < 0.01). The ratio of Bax/Bcl-2 of PV patients (0.47 +/- 0.14) was significantly lower than that in normal controls (0.76 +/- 0.24) (P < 0.01). The expression of Bcl-2 mRNA in PV patients' bone marrow hematopoietic cells was higher than that of normal controls (P < 0.01). There was no difference between the expression of Bax mRNA in bone marrow hematopoietic cells of PV patients and that of normal controls. Bcl-2 expression was negatively correlated with AnnexinV expression in CD34(+) bone marrow cells of PV patients. CONCLUSION: Over-expression of Bcl-2, one of anti-apoptosis genes, in CD34(+) bone marrow cells might be involved in the lower apoptosis of PV patients.