[Expressive changes of CD4(+)T cell subset transcription factors in patients with aplastic anemia, myelodysplastic syndrome and acute myeloid leukemia and their clinical significances]

This study was aimed to compare the expressions of specific transcription factors of CD4(+) T cell subset ( T-bet, GATA-3, RORγt and FoxP3 mRNA) in peripheral blood of patients with aplastic anemia(AA), myelodysplastic syndrome(MDS), and acute myeloid leukemia(AML), and investigate their immune status and pathogenesis, so as to provide experimental basis for the choice of clinical treatment. The expression of T-box (T-bet), GATA-3, ROR-γt and Foxp3 mRNA in PBMNC were examined by RT-PCR in 42 cases of MDS, including 22 refractory anemia(MDS-RA) and 20 refractory anemia with excess blasts (MDS-RAEB), in 23 cases of AA, 17 cases of AML patients and 16 healthy volunteers respectively. The results indicated that, compared with normal control group, expressions of T-bet and RORγt mRNA in AA patient group were significantly higher (P0.01), expression levels of GATA3 Foxp3 mRNA were lower (both P0.01). There was no significant difference in expression of T-bet and GATA3 mRNA between MDS group and normal control group, but the expression levels of Foxp3 and RORγt mRNA were higher than those in normal controls (P0.05); T-bet and RORγt in MDS-RA group were higher than those in the normal controls(P0.01), and GATA3 expression significantly reduced (P0.05), however, there was no significant difference in expression of Foxp3 between MDS-RA and the controls. Expression levels of T-bet and RORγt mRNA in patients with MDS-RAEB and AML were lower than those in normal controls (P0.05), but the expression levels of GATA3 and Foxp3 mRNA were significantly higher than those in normal controls (P0.01). It is concluded that the transcription factor expressions are different in PBMNC of patients among these three diseases. Immune-mediated excessive apoptosis may play an important role in pathogenesis, bone marrow failure in patients with AA and MDS-RA, and abnormal clones of immature cells may be one of main reasons for bone marrow failure in AML and late stage of MDS.