Thesis Yvonne Dorland

On  21 January 2020 Yvonne Dorland defended her thesis 'Crosstalk in the bone marrow. Interactions of endothelial, hematopoietic and mesenchymal stromal cells'

Promotor: Prof CE van der Schoot MD PhD
Copromotores: S Huveneers PhD and C Voermans PhD
Venue: University of Amsterdam, Agnietenkapel

Abstract

The bone marrow consists of many components, including hematopoietic stem and progenitor cells (HSPCs) that produce blood cells, stromal cells which have a supportive function, and endothelial cells forming the interior vascular wall. Mesenchymal stromal cells (MSCs) provide structural support to all bone marrow cells and instructive signals to guide hematopoiesis and are applied in a variety of cellular-based therapies. Matured blood cells cross the vascular wall, out of the bone marrow into the circulation. In this thesis, the interactions between HSPCs, MSCs, the endothelium and the bone marrow microenvironment are investigated. First, we explored the effect of the extracellular matrix protein TGFBI expression by MSCs and hematopoietic cells and found that a balanced expression of TGFBI in the bone marrow niche supports hematopoiesis. Furthermore, we uncovered that Lamin A/C expression defines the nuclear shape and the migration capacity of MSCs in vitro and viable retention of administered MSCs in vivo. During migration of MSCs, hematopoietic or immune cells across the endothelial barrier, an accurate response at the endothelial cell-to-cell contacts is required to protect the vasculature. We found that the F-BAR protein pacsin2 protects endothelial integrity during dynamic remodeling by inhibiting the internalization of cell-cell contact proteins. Finally, we examined how cell density and matrix rigidity affect the formation of the cell-cell contacts between cultured MSCs. In summary, this thesis comprises studies revealing new molecular processes involved in the crosstalk between endothelial, hematopoietic and mesenchymal stromal cells, thereby contributing to our understanding of bone marrow function. 

Chapters

Chapter 1
General introduction

Chapter 2
TGFBI Expressed by Bone Marrow Niche Cells and Hematopoietic Stem and Progenitor Cells Regulates Hematopoiesis Abstract

Chapter 3
Nuclear shape, protrusive behaviour and in vivo retention of human bone marrow mesenchymal stromal cells is controlled by Lamin-A/C expression Abstract

Chapter 4
Intermezzo: Cell-cell junctional mechanotransduction in endothelial remodeling Abstract

Chapter 5
The F-BAR protein pacsin2 inhibits asymmetric VE-cadherin internalization from tensile adherens junctions Abstract

Chapter 6
The impact of tissue culture microenvironment on the adhesion structures of mesenchymal stromal cells

Chapter 7
General discussion
 

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