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BMC Proceedings

Open Access

Dll4 blockade interferes with the bone marrow vascular niche and perturbs hematopoietic recovery following myeloablation

BMC Proceedings20104(Suppl 2):P38

Published: 24 September 2010


Public HealthBone MarrowSignaling PathwayCell DifferentiationTherapeutic Strategy

The Delta:Notch signaling pathway regulates numerous aspects of differentiation, morphogenesis and cell function, during embryogenesis and throughout adult life. More recently, Delta-like 4 (Dll4) has been shown to regulate adult neo-vascularization (angiogenesis). Consequently, therapeutic strategies to target Dll4 have been put forward for the treatment of different cancers. In the present study, we describe for the first time that Dll4 blockade affects the bone marrow (BM) microenvironment, by perturbing the BM vascular niche. Anti-Dll4 treatment administered 1 day after myeloablation increased the BM vascular content (CD31+ cells), promoted megakaryopoiesis and promoted hematopoietic (Sca1+) and endothelial progenitor (Flk1+CXCR4+) cell mobilization to the peripheral blood (PB). Moreover, anti-Dll4 treatment increased BM myeloid content, and induced mobilization of B (B220hiCD19lo) and T (CD3+NK1.1-) lymphocytes to the PB. Taken together, we show that Dll4 blockade affects the BM vascular niche, and as such affects hematopoietic cell differentiation and mobilization.

Authors’ Affiliations

Angiogenesis Lab, CIPM, Portuguese Institute of Oncology, IPOFG, EPE, Lisbon, Portugal
CEDOC, FCM, Universidade Nova de Lisboa, Lisbon, Portugal
Instituto Gulbenkian de Ciência, Oeiras, Portugal


© Remédio et al; licensee BioMed Central Ltd. 2010

This article is published under license to BioMed Central Ltd.