[The Effect of SIRT5 Deletion on Recovery of Hematopoietic Stem Cells after Injury in Mouse].

OBJECTIVE: To investigate the effect of deacylase Sirtuin 5 in the recovery of hematopoietic stem cells (HSCs) after treated by 5-FU in mouse.

METHODS: Flow cytometry was used to analyze the effect of SIRT5 deletion on the proportion of hematopoietic stem/progenitor cells (HSPCs) in bone marrow (BM), the proportion of T cells, B cells and myeloid cells (TBM) in peripheral blood (PB) and spleen, and the development of T cells in thymus. Mouse were treated with 5-FU to study the effect of SIRT5 deletion on the cell cycle, apoptosis and the proportion of HSPCs in BM. The effect of SIRT5 deletion on the proliferation of HSCs was analyzed by flow sorting in vitro .

RESULTS: SIRT5 deletion did not affect the development of T cells in thymus and the proportion of TBM cells in PB and spleen compared with wild type mice. SIRT5 deletion increased proportion of HSPCs in BM. After 5-FU treatment, the proportion of HSCs in SIRT5 deletion mice was significant decreased ( P < 0.05), the HSPC in SIRT5 deletion mice was activated from G0 to G1 phase ( P < 0.05), and the proportion of early apoptosis increased ( P < 0.05). By monoclonal culture in vitro , the ability of HSCs to form clones in SIRT5 deletion mice was decreased significantly ( P < 0.05).

CONCLUSION: SIRT5 deletion lead to a decreased the ability of HSCs to clone in vitro . SIRT5 deletion is not conducive to the recovery of HSPCs injury in mice under hematopoietic stress.