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MicroRNA-127-3p controls murine hematopoietic stem cell maintenance by limiting differentiation.

Abstract：

:The balance between self-renewal and differentiation is crucial to ensure the homeostasis of the hematopoietic system, and is a hallmark of hematopoietic stem cells. However, the underlying molecular pathways, including the role of micro-RNA, are not completely understood. To assess the contribution of micro-RNA, we performed micro-RNA profiling of hematopoietic stem cells and their immediate downstream progeny multi-potent progenitors from wild-type control and Pbx1-conditional knockout mice, whose stem cells display a profound self-renewal defect. Unsupervised hierarchical cluster analysis separated stem cells from multi-potent progenitors, suggesting that micro-RNA might regulate the first transition step in the adult hematopoietic development. Notably, Pbx1-deficient and wild-type cells clustered separately, linking micro-RNAs to self-renewal impairment. Differential expression analysis of micro-RNA in the physiological stem cell-to-multi-potent progenitor transition and in Pbx1-deficient stem cells compared to control stem cells revealed miR-127-3p as the most differentially expressed. Furthermore, miR-127-3p was strongly stem cell-specific, being quickly down-regulated upon differentiation and not re-expressed further downstream in the bone marrow hematopoietic hierarchy. Inhibition of miR-127-3p function in Lineage-negative cells, achieved through a lentiviral-sponge vector, led to severe stem cell depletion, as assessed with serial transplantation assays. miR-127-3p-sponged stem cells displayed accelerated differentiation, which was uncoupled from proliferation, accounting for the observed stem cell reduction. miR-127-3p overexpression in Lineage-negative cells did not alter stem cell pool size, but gave rise to lymphopenia, likely due to lack of miR-127-3p physiological downregulation beyond the stem cell stage. Thus, tight regulation of miR-127-3p is crucial to preserve the self-renewing stem cell pool and homeostasis of the hematopoietic system.

journal_name

Haematologica

journal_title

Haematologica

authors

Crisafulli L,Muggeo S,Uva P,Wang Y,Iwasaki M,Locatelli S,Anselmo A,Colombo FS,Carlo-Stella C,Cleary ML,Villa A,Gentner B,Ficara F

doi

10.3324/haematol.2018.198499

subject

Has Abstract

pub_date

2019-09-01 00:00:00

pages

1744-1755

issue

eissn

0390-6078

issn

1592-8721

pii

haematol.2018.198499

journal_volume

104

pub_type

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MicroRNA-127-3p controls murine hematopoietic stem cell maintenance by limiting differentiation.