再生障碍性贫血患者血清对脐血CD34(上标 +)细胞cyclin D关键亚型表达的影响

AIM: To explore the pathogenesis of aplastic anemia (AA), we identified the crucial isoform of cyclin D that determine the proliferation of the cord blood CD34(superscript +) cells and observed effects of AA serum on the expression of crucial cyclin D isoform in umbilical cord blood CD34(superscript +) cells. METHODS: The CD34(superscript +) cells were isolated with MIDI-MACS system. The isoforms of cyclin D were detected by RT-PCR and Western blotting. Methylcellulose culture system was used to measure the formation of CFU-GM. The expression level of crucial cyclin D isoform was assayed by RT-PCR and Western blotting after the CD34(superscript +) cells were incubated in AA serum. RESULTS: The crucial cyclin D isoform in CD34 cells was cyclin D3. The AA serum inhibited the formation of CFU-GM and down-regulated expression level of the cyclin D3 from the mRNA to protein level, respectively. CONCLUSION; The AA serum inhibits the proliferation of CD34 cells and down-regulates level of cyclin D3, this may be one of hematopoiesis inhibition mechanisms in AA.