RESUMO
AIM: To study the effect of TGF-? 1 and TN F-? antisense PS-ODNS on ex vivo expansion of hematopoietic stem/progenitor cell s (HSPC). METHODS: CD 34 + cells were purified from fres h umbilical cord blood by immunomagnetic beads, and mononuclear cells were purifi ed from bone marrow by Ficoll-hypaque . The effects of TGF-? 1 and /or TNF-? an tisense PS-ODNS on ex vivo expansion of CD 34 + cells、CFU-GEMM、CFU-G M、CFU-E and BFU-E were detected by using liquid and semi-solid culture systems . RESULTS: TGF-? 1 antisense PS-ODNS cooperated with cytokines increased the number of CD 34 + cells,CFU-GEMM,CFU-GM,CFU-E and BFU-E , which was as 4,2.6,2.7,1.8,2.1 times as that of the control (the cytokine s combination), respectively. TNF-? antisense PS-ODNS cooperated with cytokines respectively increased the number of CD 34 + cells, CFU-GEMM, CFU-GM, CF U-E and BFU-E by 4, 2 9, 2 6, 1 7, 1 8 times as that of the control. The ab ove two antisense PS-ODNS cooperated with cytokines could respectively increased the number of CD 34 + cells, CFU-GEMM, CFU-GM, CFU-E and BFU-E by 5 3,2 1, 2 7, 1 9, 1 8 times as that of the control. CONCLUSION: I nhibition of endogenous TGF-? 1 and TNF-? by antisense PS-ODNS will be one of the effective methods to expand HSPC ex vivo.