Abe T, Matsuoka Y, Nagao Y, Sonoda Y, Hanazono Y. CD34-negative hematopoietic stem cells show distinct expression profiles of homing molecules that limit engraftment in mice and sheep.
Int J Hematol 2017;
106:631-637. [PMID:
28687990 DOI:
10.1007/s12185-017-2290-5]
[Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Revised: 06/27/2017] [Accepted: 06/28/2017] [Indexed: 02/02/2023]
Abstract
We and others have reported that human hematopoietic stem cells (HSCs) are also present in the CD34-negative (CD34-) fraction of human cord blood (CB). Here, we examined the hematopoietic engraftment potential of 13 or 18 lineage-negative (13Lin- or 18Lin-) CD34+/- cells from human CB in mice and sheep. Both 13Lin- and 18Lin- CD34+ cells efficiently engrafted in mice irrespective of transplantation route, be it by tail-vein injection (TVI) or by intra-bone marrow injection (IBMI). These cells also engrafted in sheep after in utero fetal intra-hepatic injection (IHI). In contrast, neither 13Lin- nor 18Lin- CD34- cells engrafted in either mice or sheep when transplanted by regular routes (i.e., TVI and fetal IHI, respectively), although both 13Lin- and 18Lin- CD34- cells engrafted in mice when transplanted by IBMI and exhibited multilineage reconstitution ability. Thus, the homing ability of CD34- HSCs is significantly more limited than that of CD34+ HSCs. As for 18Lin-, CD34- HSCs are characterized by low expression of the tetraspanin CD9, which promotes homing, and high expression of the peptidase CD26, which inhibits homing. This unique expression pattern homing-related molecules on CD34- HSCs could thus explain in part their reduced ability to home to the BM niche.
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