Abstract
Hematopoietic stem cells (HSCs) are a rare population of cells that are responsible for life-long generation of blood cells of all lineages. In order to maintain their numbers, HSCs must establish a balance between the opposing cell fates of self-renewal and initiation of hematopoietic differentiation. Multiple signaling pathways have been implicated in the regulation of HSC cell fate. One such set of pathways are those activated by the Wnt family of ligands. The function of the canonical Wnt signaling pathway, which utilizes beta-catenin to regulate gene expression, has been extensively studied in hematopoiesis. However, there is a growing body of evidence that the other Wnt signaling pathways, termed non-canonical, also play an important role. In this review, we will discuss the regulation of hematopoiesis by the Wnt signaling pathways, focusing on the potential functions of non-canonical Wnt signaling pathways.
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