Leptin-receptor-expressing bone marrow stromal cells are myofibroblasts in primary myelofibrosis.

Leptin-receptor-expressing bone marrow stromal cells are myofibroblasts in primary myelofibrosis.
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DOI:
10.1038/ncb3530
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发表时间:
2017-06
影响因子:
21.3
通讯作者:
Ding L
Ding L
中科院分区:
生物学1区
文献类型:
--
作者:
Decker M;Martinez-Morentin L;Wang G;Lee Y;Liu Q;Leslie J;Ding L

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Bone marrow fibrosis is a critical component of primary myelofibrosis (PMF). But the origin of myofibroblasts that drive fibrosis is unknown. Using genetic fate mapping we found that bone marrow Leptin receptor (Lepr) – expressing mesenchymal stromal lineage cells expanded extensively and were the fibrogenic cells in PMF. These stromal cells down-regulated the expression of key haematopoietic stem cell (HSC)- supporting factors and up-regulated genes associated with fibrosis and osteogenesis, indicating fibrogenic conversion. Administration of imatinib or conditional deletion of platelet-derived growth factor receptor a (Pdgfra) from Lepr+ stromal cells suppressed their expansion and ameliorated bone marrow fibrosis. Conversely, activation of the PDGFRa pathway in bone marrow Lepr+ cells led to expansion of these cells and extramedullary haematopoiesis, features of PMF. Our data identify Lepr+ stromal lineage cells as the origin of myofibroblasts in PMF and suggest that targeting PDGFRa signaling could be an effective way to treat bone marrow fibrosis.
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