| First Author | Kurkewich JL | Year | 2018 |
| Journal | Exp Hematol | Volume | 59 |
| Pages | 14-29 | PubMed ID | 29288704 |
| Mgi Jnum | J:273679 | Mgi Id | MGI:6282375 |
| Doi | 10.1016/j.exphem.2017.12.007 | Citation | Kurkewich JL, et al. (2018) The mirn23a and mirn23b microrna clusters are necessary for proper hematopoietic progenitor cell production and differentiation. Exp Hematol 59:14-29 |
| abstractText | Mice deficient for microRNA (miRNA) cluster mirn23a exhibit increased B lymphopoiesis at the expense of myelopoiesis, whereas hematopoietic stem and progenitor cell (HSPC) populations are unchanged. Mammals possess a paralogous mirn23b gene that can give rise to three mature miRNAs (miR-23b, miR-24-1, and miR-27b) that have identical seed/mRNA-targeting sequences to their mirn23a counterparts. To assess whether compound deletion of mirn23a and mirn23b exacerbates the hematopoietic phenotype observed in mirn23a(-/-) mice, we generated a compound mirn23a(-/-)mirn23b(fl/fl):Mx1-Cre conditional knockout mouse and assayed hematopoietic development after excision of mirn23b. Loss of both genes in adult bone marrow further skewed HSPC differentiation toward B cells at the expense of myeloid cells, demonstrating a dosage-dependent effect on regulating cell differentiation. Strikingly, double-knockout (DKO) mice had decreased bone marrow cellularity with significantly decreased hematopoietic stem cell and HSPC populations, a phenotype not observed in mice deficient for mirn23a alone. Competitive transplantation assays showed decreased contribution of mirn23a(-/-)mirn23b(-/-) HSPCs to hematopoietic lineages at 6 and 12 weeks after transplantation. Defects in the proliferation of mirn23a(-/-)b(-/-) HSPCs was not observed; however, DKO cells were more apoptotic compared with both wild-type and mirn23a(-/-) cells. Together, our data show that complete loss of mirn23a/mirn23b miRNAs results in decreased blood production and affects lineage output in a concentration-dependent manner. |
