Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.529243
Title: Density dependent differentiation of mesenchymal stem cells to endothelial cells
Author: Whyte, Jemima Lois
Awarding Body: University of Manchester
Current Institution: University of Manchester
Date of Award: 2010
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Abstract:
The differentiation of mesenchymal stem cells (MSCs) to endothelium is a critical but poorly understood feature of tissue vascularisation and considerable scepticism still remains surrounding this important differentiation event. Defining features of endothelial cells (ECs) are their ability to exist as contact-inhibited polarised monolayers that are stabilised by intercellular junctions, and the expression and activity of endothelial markers. During vasculogenesis, communication between MSCs and differentiated ECs or vascular smooth muscle cells, or between MSCs themselves is likely to influence MSC differentiation. In this study, the possibility that cell density can influence MSC differentiation along the EC lineage was examined. High density plating of human bone marrow-derived MSCs induced prominent endothelial characteristics including cobblestone-like morphology, enhanced endothelial networks, acetylated-low density lipoprotein uptake, vascular growth and stimulated expression of characteristic endothelial markers. Mechanistically, this density-dependent process has been defined. Cell-cell contact-induced Notch signalling was a key initiating step regulating commitment towards an EC lineage, whilst VEGF-A stimulation was required to consolidate the EC fate. Thus, this study not only provides evidence that MSC density is an essential microenvironmental factor stimulating the in vitro differentiation of MSCs to ECs but also demonstrates that MSCs can be differentiated to a functional EC. Taken together, defining how these crucial MSC differentiation events are regulated in vitro, provides an insight into how MSCs differentiate to ECs during postnatal neovascularisation and an opportunity for the therapeutic manipulation of MSCs in vivo, enabling targeted modulation of neovascularisation in ischaemia, wound healing and tumourigenesis.
Supervisor: Kielty, Catherine Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.529243  DOI: Not available
Keywords: mesenchymal stem cells; differentiation; endothelial cells; Notch; VEGF-A
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