» Articles » PMID: 27998927

Niche WNT5A Regulates the Actin Cytoskeleton During Regeneration of Hematopoietic Stem Cells

Abstract

Here, we show that the Wnt5a-haploinsufficient niche regenerates dysfunctional HSCs, which do not successfully engraft in secondary recipients. RNA sequencing of the regenerated donor Lin SCA-1 KIT (LSK) cells shows dysregulated expression of ZEB1-associated genes involved in the small GTPase-dependent actin polymerization pathway. Misexpression of DOCK2, WAVE2, and activation of CDC42 results in apolar F-actin localization, leading to defects in adhesion, migration and homing of HSCs regenerated in a Wnt5a-haploinsufficient microenvironment. Moreover, these cells show increased differentiation in vitro, with rapid loss of HSC-enriched LSK cells. Our study further shows that the Wnt5a-haploinsufficient environment similarly affects BCR-ABL leukemia-initiating cells, which fail to generate leukemia in 42% of the studied recipients, or to transfer leukemia to secondary hosts. Thus, we show that WNT5A in the bone marrow niche is required to regenerate HSCs and leukemic cells with functional ability to rearrange the actin cytoskeleton and engraft successfully.

Citing Articles

Cellular crosstalk in the bone marrow niche.

Huang Z, Iqbal Z, Zhao Z, Liu J, Alabsi A, Shabbir M J Transl Med. 2024; 22(1):1096.

PMID: 39627858 PMC: 11613879. DOI: 10.1186/s12967-024-05900-6.


The role of the haematopoietic stem cell niche in development and ageing.

Cain T, Derecka M, McKinney-Freeman S Nat Rev Mol Cell Biol. 2024; 26(1):32-50.

PMID: 39256623 DOI: 10.1038/s41580-024-00770-8.


Targeting CDC42 reduces skeletal degeneration after hematopoietic stem cell transplantation.

Landspersky T, Stein M, Sacma M, Geuder J, Braitsch K, Riviere J Blood Adv. 2024; 8(20):5400-5414.

PMID: 39159429 PMC: 11526086. DOI: 10.1182/bloodadvances.2024012879.


Extra-hematopoietic immunomodulatory role of the guanine-exchange factor DOCK2.

Scharler C, Poupardin R, Ebner-Peking P, Wolf M, Schreck C, Brachtl G Commun Biol. 2022; 5(1):1246.

PMID: 36380073 PMC: 9666545. DOI: 10.1038/s42003-022-04078-1.


Frizzled-6 promotes hematopoietic stem/progenitor cell mobilization and survival during LPS-induced emergency myelopoiesis.

Nguyen T, Abidin B, Heinonen K Stem Cell Reports. 2022; 17(10):2303-2317.

PMID: 36084638 PMC: 9561701. DOI: 10.1016/j.stemcr.2022.08.004.


References
1.
Schreck C, Bock F, Grziwok S, Oostendorp R, Istvanffy R . Regulation of hematopoiesis by activators and inhibitors of Wnt signaling from the niche. Ann N Y Acad Sci. 2014; 1310:32-43. DOI: 10.1111/nyas.12384. View

2.
Sengupta A, Arnett J, Dunn S, Williams D, Cancelas J . Rac2 GTPase deficiency depletes BCR-ABL+ leukemic stem cells and progenitors in vivo. Blood. 2010; 116(1):81-4. PMC: 2904584. DOI: 10.1182/blood-2009-10-247437. View

3.
Dykstra B, Olthof S, Schreuder J, Ritsema M, de Haan G . Clonal analysis reveals multiple functional defects of aged murine hematopoietic stem cells. J Exp Med. 2011; 208(13):2691-703. PMC: 3244040. DOI: 10.1084/jem.20111490. View

4.
Nemeth M, Topol L, Anderson S, Yang Y, Bodine D . Wnt5a inhibits canonical Wnt signaling in hematopoietic stem cells and enhances repopulation. Proc Natl Acad Sci U S A. 2007; 104(39):15436-41. PMC: 1986571. DOI: 10.1073/pnas.0704747104. View

5.
Yang L, Wang L, Geiger H, Cancelas J, Mo J, Zheng Y . Rho GTPase Cdc42 coordinates hematopoietic stem cell quiescence and niche interaction in the bone marrow. Proc Natl Acad Sci U S A. 2007; 104(12):5091-6. PMC: 1829299. DOI: 10.1073/pnas.0610819104. View