Runx1 and Runx2 inhibit fibrotic conversion of cellular niches for hematopoietic stem cells

Yoshiki Omatsu, Shota Aiba, Tomonori Maeta, Kei Higaki, Kazunari Aoki, Hitomi Watanabe, Gen Kondoh, Riko Nishimura, Shu Takeda, Ung-il Chung and Takashi Nagasawa ()
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Yoshiki Omatsu: Osaka University
Shota Aiba: Osaka University
Tomonori Maeta: Osaka University
Kei Higaki: Osaka University
Kazunari Aoki: Kyoto University
Hitomi Watanabe: Kyoto University
Gen Kondoh: Kyoto University
Riko Nishimura: Osaka University
Shu Takeda: Endocrinology Division, Toranomon Hospital
Ung-il Chung: The University of Tokyo
Takashi Nagasawa: Osaka University

Nature Communications, 2022, vol. 13, issue 1, 1-12

Abstract: Abstract In bone marrow, special microenvironments, known as niches, are essential for the maintenance of hematopoietic stem cells (HSCs). A population of mesenchymal stem cells, termed CXC chemokine ligand 12 (CXCL12)-abundant reticular (CAR) cells or leptin receptor-expressing cells are the major cellular component of HSC niches. The molecular regulation of HSC niche properties is not fully understood. The role of Runx transcription factors, Runx1 and Runx2 in HSC cellular niches remains unclear. Here we show that Runx1 is predominantly expressed in CAR cells and that mice lacking both Runx1 and Runx2 in CAR cells display an increase in fibrosis and bone formation with markedly reduced hematopoietic stem and progenitor cells in bone marrow. In vitro, Runx1 is induced by the transcription factor Foxc1 and decreases fibrotic gene expression in CAR cells. Thus, HSC cellular niches require Runx1 or Runx2 to prevent their fibrotic conversion and maintain HSCs and hematopoiesis in adults.

Date: 2022
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DOI: 10.1038/s41467-022-30266-y

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