西亚试剂：Notch-Dependent Repression of miR-155 in the Bone Marrow Ni

Lin Wang, Huajia Zhang, Sonia Rodriguez, Liyun Cao, Jonathan Parish, Christen Mumaw, Amy Zollman, Malgorzata M. Kamoka, Jian Mu,Danny Z. Chen, Edward F. Srour, Brahmananda R. Chitteti, Harm HoGENEsch, Xiaolin Tu, Teresita M. Bellido, H. Scott Boswell,Taghi Manshouri, Srdan Verstovsek, Mervin C. Yoder, Reuben Kapur, Angelo A. Cardoso, Nadia Carlesso

The microRNA miR-155 has been implicated in regulating inflammatory responses and tumorigenesis, but its precise role in linking inflammation and cancer has remained elusive. Here, we identify a connection between miR-155 and Notch signaling in this context. Loss of Notch signaling in the bone marrow (BM) niche alters hematopoietic homeostasis and leads to lethal myeloproliferative-like disease. Mechanistically, Notch signaling represses miR-155 expression by promoting binding of RBPJ to the miR-155 promoter. Loss of Notch/RBPJ signaling upregulates miR-155 in BM endothelial cells, leading to miR-155-mediated targeting of the nuclear factor κB (NF-κB) inhibitor κB-Ras1, NF-κB activation, and increased proinflammatory cytokine production. Deletion of miR-155 in the stroma of RBPJ−/− mice prevented the development of myeloproliferative-like disease and cytokine induction. Analysis of BM from patients carrying myeloproliferative neoplasia also revealed elevated expression of miR-155. Thus, the Notch/miR-155/κB-Ras1/NF-κB axis regulates the inflammatory state of the BM niche and affects the development of myeloproliferative disorders

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