p57Kip2 regulates embryonic blood stem cells by controlling sympathoadrenal progenitor expansion.
View / Open Files
Authors
Kapeni, Chrysa
Xia, Kankan
Malouf, Camille
Pimanda, John E
Publication Date
2022-06-02Journal Title
Blood
ISSN
0006-4971
Publisher
American Society of Hematology
Type
Article
This Version
AM
Metadata
Show full item recordCitation
Kapeni, C., Nitsche, L., Kilpatrick, A. M., Wilson, N., Xia, K., Mirshekar-Syahkal, B., Chandrakanthan, V., et al. (2022). p57Kip2 regulates embryonic blood stem cells by controlling sympathoadrenal progenitor expansion.. Blood https://doi.org/10.1182/blood.2021014853
Abstract
Hematopoietic stem cells (HSCs) are of major clinical importance, and finding methods for their in vitro generation is a prime research focus. We demonstrate here that the cell cycle inhibitor p57Kip2/Cdkn1c limits the number of emerging HSCs by restricting the size of the sympathetic nervous system (SNS) and the amount of HSC-supportive catecholamines secreted by these cells. This regulation occurs at the SNS progenitor level and is in contrast to the cell-intrinsic function of p57Kip2 in maintaining adult HSCs, highlighting profound differences in cell cycle requirements of adult HSCs compared with their embryonic counterparts. Furthermore, this effect is specific to the aorta-gonads-mesonephros (AGM) region and shows that the AGM is the main contributor to early fetal liver colonization, as early fetal liver HSC numbers are equally affected. Using a range of antagonists in vivo, we demonstrate a requirement for intact b2-adrenergic signaling for SNS-dependent HSC expansion. To gain further molecular insights, we have generated a single-cell RNA-Seq dataset of all Ngfr+ sympathoadrenal cells around the dorsal aorta to dissect their differentiation pathway. Importantly, this not only defined the relevant p57Kip2-expressing SNS progenitor stage, but also revealed that some neural crest cells, upon arrival at the aorta, are able to take an alternative differentiation pathway, giving rise to a subset of ventrally restricted mesenchymal cells that express important HSC-supportive factors. Neural crest cells thus appear to contribute to the AGM HSC niche via two different mechanisms: SNS-mediated catecholamine secretion and HSC-supportive mesenchymal cell production.
Keywords
CambridgeStemCellInstitute
Sponsorship
Wellcome Trust (203151/Z/16/Z)
Identifiers
External DOI: https://doi.org/10.1182/blood.2021014853
This record's URL: https://www.repository.cam.ac.uk/handle/1810/337436
Statistics
Total file downloads (since January 2020). For more information on metrics see the
IRUS guide.