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Objective To explore the immunophenotype features and folate receptor expression of blasts in patients with myelodysplastic syndromes(MDS).Methods Four-color flow cytometry using conventional and secondary gating strategies was used into analysis the immunophenotype features and folate receptor(FR) expression of blasts and CD+34 cells in bone marrow nucleated cells with MDS.The patients with acute myeloid leukemia-M2(AML-M2) were as positive control.Results with progression of MDS from RA/RAS,RAEB to RAEB-T,using conventional gating strategy,the proportion of CD+34 cells were gradually increased(P＜0.05).Moreover,the expression of HLA-DR,CDll7,CD13,CD33 were also gradually increased and the expression of CDl5 was gradually decreased(P＜0.05).Using secondary gating strategy,the expression of HLA-DR,CD117,CD13,CD33 on blasts were higher than those by conventional gating(P＜0.05).However,there was no significant difference(P＞0.05) in the expression of above mentioned antigens on CD+34 cells among different MDS subtypes.On the other hand,there were no expression of FR on blasts and cD+34 cells with different MDS subtypes.Conclusion With progression of MDS,the antigens of blasts surface change into more immature immunophenotype of medullary system.But these antigens abnormal expression only illustrates the increase of ascendant malignant clone quantity,it can not reflect the nature of the disease.Using flow cytometry technique can not detect whether or not FR expression on the blasts with MDS.
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OBJECTIVE To investigate the Ureaplasma urealyticum infection in patients with urogenital infections and the distribution of its serotypes and genotypes.METHODS The clinical samples were firstly screened with B-Merieux mycoplasma ID2 culture and identification kit,then the positive cultural samples were subtyped by PCR method.RESULTS The positive rate of U.urealyticum with cultural kit was 37.43%(670/1790).The 392 positive cultural samples were subtyped with PCR,the positive rate of U.parvum was 71.94% and the positive rate of U.urealyticum was 29.85%.The serotypes of 264 U.parvum positive samples were identified with PCR,there were 20 samples with serovar 1(7.58%),139 samples with serovar 3 or 14(52.65%),and 51 samples with serovar 6(19.32%).Ninety nine positive samples with U.urealyticum were genotyped,the results showed that the rate of genotype 3(serovar 7 or 11) was lower than genotypes 1 and 2.CONCLUSIONS PCR identification and subtyping of Ureaplasma in patients with urogenital infections showed that the major epidemic pathogen of Ureaplasma in east of Guangdong Province is U.urealyticum serovar 3 and serovar 6,and the distribution of different serotypes or genotypes of Ureaplasma in this area is specific.
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AIM: To study the effect of proliferating cell nucler antigen antisense oligonucleotide on ex vivo expansion of cord blood CD34~+ hematopoietic stem/progenitor cells.METHODS: CD34~+ cells were purified from fresh cord blood by immunomagnetic beads.CD34~+ cells were incubated in liquid culture system with different concentrations of(PCNA-ASODN).Using flow cytometry,the number of different kinds of stem/progenitor cells and PCNA expression were measured after CD34~+ cell incubation.RESULTS: PCNA was lowly expressed in low experiential group,with a positive rate of(27.2?3.6)% and(19.0?1.5)%,the positive rate of control group was(53.8?8.3)%(P