FRIL maintains quiescence of hematopoietic stem cells through regulation of cell cycle related factors

Jin Li*, Xiao yan Xie, Dong mei Wang, Xue tao Pei

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


OBJECTIVE: To explore the mechanism of Flt3 receptor-interacting lectin (FRIL) maintains quiescence of hematopoietic stem cells (HSCs) in vitro. METHODS: Cord blood CD34+ cells were cultured in suspension medium supplemented with or without FRIL and FL. Cells were collected at different time points and the expression of some cell cycle regulators, especially those involved in G0/G1 phase regulation were detected on mRNA and protein level. RESULTS: The expressions of G0/G1 phase related cyclins or CDKs were undetectable in the newly isolated CD34+ cells, expressions of Cyclin D3, CDK6 and P27 were the lowest in FRIL cultured group after 3d's culture (FRIL group: 483 +/- 63, 553 +/- 39, 0.312 +/- 0.030; FL group: 2437 +/- 52, 3209 +/- 98, 0.787 +/- 0.024; BLANK: 914 +/- 105, 1497 +/- 55, 0.616 +/- 0.029, respectively), but the expression of P53 was the highest in FRIL group (FRIL group: 4.476 +/- 0.159; FL group: 0.581 +/- 0.099, BLANK: 2.167 +/- 0.114). The expression of positive regulators of cell cycle in FRIL group were the same as that of FL group and blank group or lower. CONCLUSION: FRIL preserves HSCs effectively in vitro through the mechanisms of down-regulation of cyclin D3 and CDK6 and activation of P53. P27 is mostly involved in the differentiation of HSCs.

Original languageEnglish (US)
Pages (from-to)37-40
Number of pages4
JournalZhonghua xue ye xue za zhi = Zhonghua xueyexue zazhi
Issue number1
StatePublished - Jan 2007
Externally publishedYes

ASJC Scopus subject areas

  • General Medicine


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