摘要
Objective To measure the quantities and apoptosis-related protein levels of B lymphocyte in the patients with immunorelated pancytopenia （IRP） and explore the action of B lymphocyte in the pathogenic mechanism of IRP. Methods Quantifies of whole B lymphocytes and CD5^＋ B lymphocytes as well as the expressions of Fas and Bcl-2 in B lymphocytes in 35 patients with untreated IRP, 15 IRP patients in complete remission （CR）, and 10 normal controls were assayed by flow cytometry. The percentages of B lymphocyte and CD5^＋ B lymphocyte were significantly higher in untreated IRP patients than in CR IRP patients and normal controls （ P 〈 0. 05 ）, and there was no significant difference between the latter two groups （ P 〉 0. 05 ）. There was no significant difference of Fas expression in B lymphocyte among three groups （ P 〉 0. 05）. The expression of Bcl-2 in B lymphocyte was significantly higher in untreated patients than in CR patients or normal controls （ P 〈 0. 01 ）, and significantly higher in CR patients than in normal controls （ P 〈 0. 01 ）. The apoptosis. related index was significantly lower in untreated patients than in CR patients or normal controls （ P 〈 0. 05 ）, and signif. icantly lower in CR patients than in normal controls （ P 〈 0. 05 ）. The percentage of B lymphocyte was positively correlated with post-treated response time （ r = 0. 53, P 〈 0. 01 ）. Conclusion The production of auto-antibodies in IRP patients probably has some relationship with the abnormal quantifies of B lymphocyte and its subpopulations as well as with the inhibition of B lymphocyte apoptosis.
