Thesis Lanette Kempers
On 28 september 2022 (10:00 AM) Lanette Kempers defended her thesis 'A vascular affair' at the University of Amsterdam.
Promotor: Prof JD van Buul PhD
Copromotor: C Margadant PhD
Venue: Agnietenkapel, University of Amsterdam
Summary
In this thesis, 3 topics regarding the vascular system are discussed. First, a vessel-on-a-chip method is used to study the process of leukocyte transendothelial migration (TEM) in full. In the commonly used methods, the leukocytes encounter plastic after extravasating from the vessels instead of soft tissue. In the vessel-on-a-chip however, these cells encounter a physiological extracellular matrix. Using this state-of-the-art method, we were able to show that different leukocytes employ different methods of migration, something that previously could not be studied in vitro. In addition, we used this system to characterize neutrophils of a patient lacking the ARPC1B gene. These neutrophils are defective, especially in their migratory behavior. Using the vessel-on-a-chip, we could distinguish between hampered extravasation and diminished subsequent migration. The next topic concerns sprouting angiogenesis. A bead-sprouting assay is optimized for confocal microscopy, allowing the study of the process in much more detail. This assay is then used to study the role of Rab5C during VEGFR2 internalization and subsequent sprouting of the endothelial cells. Lastly, the role of the RhoGEF Trio in endothelial cells is described. Trio is well known for its role during neural growth; however, our group has shown it is an important factor in endothelial cells as well. Especially regarding the barrier function between endothelial cells. We created a vascular -specific, inducible mouse model to study this role in vivo.
Chapters
Chapter 1
General introduction
Chapter 2
Transendothelial migration induces differential migration dynamics of leukocytes in tissue matrix abstract
Chapter 3
Defective neutrophil transendothelial migration and lateral motility in ARPC1B deficiency under flow conditions abstract
Chapter 4
Fast in vitro protocol for the visualization and quantitative high-throughput analysis of sprouting angiogenesis by confocal microscopy abstract
Chapter 5
The endosomal RIN2/Rab5C machinery prevents VEGFR2 degradation to control gene expression and tip cell identity during angiogenesis abstract
Chapter 6
The RhoGEF Trio: a protein with a wide range of functions in the vascular endothelium abstract
Chapter 7
Mice with an endothelial specific, tamoxifen- inducible loss of Trio appear healthy and without abnormalities
Chapter 8
General discussion
Download
Download PhD thesis (university repository)
