RESUMEN
【Objective】 To investigate the feasibility of differentiation of human AB plasma hematopoietic stem/progenitor cells (HSCs/HPCs) from peripheral blood into mature erythrocytes. 【Methods】 Hematopoietic stem/progenitor cells were induced to be differentiated into mature erythrocytes in the medium supplemented with 5% FBS, 3% FBS + 2% human AB plasma and 8% human AB plasma, respectively, and inoculated in 24-well culture plate at the density of 1×106/mL. Cell proliferation and morphological changes were observed in three different groups. Flow cytometry was used to detect erythroid terminal differentiation markers, i. e. GPA, Band3 and α4(α4-integrin), and late erythroid cell enucleation in different group. The effects of different culture conditions on HSCs/HPCs differentiation into mature erythrocytes were compared. 【Results】 The cell growth and proliferation multiples of the three groups (8% human AB plasma, 5% FBS and 3% FBS+ 2% human AB plasma) were 2 573±116 vs 2 514±246 vs 2 539±119(P>0.05), respectively. The morphological changes of the three groups were similar. With the extension of culture time, the cells differentiated from proerythroblasts to basophils, polychromatic erythroblasts and positive erythroblasts, and almost all of them differentiated into erythrocytes enucleation on day 21. GPA expression and enucleation rate(%) of the three groups were 97.17±1.91 vs 94.95±1.61 vs 96.15±1.38, and 85.1±3.26 vs 86.93±5.96 vs 86.5±3.36(P>0.05), respectively. 【Conclusion】 The differentiation of HSCs/HPCs from peripheral blood plasma into mature erythrocytes from human AB was similar to that of fetal bovine serum.
RESUMEN
BACKGROUND:Buffy-coat-derived platelet concentrates and plasma-rich platelet concentrates have a high incidence of invalid infusion and adverse reactions. OBJECTIVE:To observe the improved preparation of buffy-coat-derived platelet concentrates and to analyze the influential factors relevant to platelet recovery. METHODS:400 mL of blood sample extracted from 126 cases were randomly divided into improved buffy-coat group, buffer-coat group and platelet-rich plasma after 4-6 hours. The 3-step centrifugal method was used for improved preparation of buffy-coat-derived platelet concentrates:step 1, centrifugation at 2 300 r/min for 12 minutes at (22±2)℃ with a deceleration of 5;step 2, centrifugation at 910 r/min for 10 minutes at (22±2)℃;step 3, centrifugation at 2 800 r/min for 12 minutes at (22±2)℃. After centrifugation, the upper layer containing few platelets was removed, and the rest 30 mL platelet suspension was platelet concentrates. Factors affecting platelet recovery were analyzed through literature retrieval. RESULTS AND CONCLUSION:There was no difference in platelet number among the three groups before preparation of platelet concentrates (P>0.05). A higher rate of platelet recovery was found in the platelet-rich plasma group and improved buffy-coat group compared with the buffy-coat group (P0.05). There were less residual red blood cells and white blood cells in the two buffy-coat groups than the platelet-rich plasma group (P0.05). The recovery rate of prepared platelet concentrates was affected by the whole blood amount, centrifugal speed, centrifugation time and methods. Improved buffy-coat method for preparation of platelet concentrates can be generalized in blood centers or blood stations, because it can reduce residual red blood cells and white blood cells and increase rate of platelet recovery.