Thesis Niels Verstegen
On 14 April 2023 Niels Verstegen defended his thesis 'Going beyond your form: T-cell dependent B-cell fate determination' at the University of Amsterdam.
Promotor: Prof SM van Ham PhD
Copromotores: JA ten Brinke PhD and Prof M Barberis PhD
Venue: Agnietenkapel, University of Amsterdam
Summary
The immune response to T cell-dependent antigens relies heavily on the differentiation of B cells into high-affinity memory B cells and antibody-secreting cells (ASC). This process is initiated by the recognition of antigens and repeated interactions between B cells and T follicular helper (Tfh) cells. Tfh cells select B cells based on their ability to present antigens as peptide complexed with major histocompatibility complex II (p:MHCII), resulting in a prolonged interaction between Tfh and B cells, which drives the humoral response. This thesis aims to understand the regulation of Tfh cell and B cell differentiation and function. The research identified the signaling pathway necessary for internalization and presentation of large particles by human B cells. Moreover, the research highlights the plasticity of Tfh cell phenotype, with the ability to co-express multiple cytokines regulated temporally by T cell receptor stimulation. The research also contributed to a better understanding of how the signals delivered by Tfh cells, particularly CD40L and cytokines IL-21 and IL-4, integrate to drive ASC differentiation. By using single-cell RNA sequencing and analysis of B cell differentiation in vitro, a novel ASC-precursor population and in vitro B cell differentiation pathways were identified that accurately recapitulate germinal center B cell reactions and early memory B cell formation. Overall, this thesis provides insights into the intricate interplay between Tfh cells and B cells during the immune response. The findings could aid in developing novel therapeutic strategies for immune-related disorders by providing a better understanding of the regulation of B cell differentiation.
Chapters
Chapter 1
General introduction and outline of the thesis
Chapter 2
System-level scenarios for the elucidation of T cell-mediated germinal center B cell differentiation abstract
Chapter 3
Human B cells engage the NCK/PI3K/RAC1 axis to internalize large particles via the IgM-BCR abstract
Chapter 4
TCR signal strength regulates the plastic co-expression of IL-4 and IFN-y by Tfh-like cells
Chapter 5
Minimalistic in vitro culture to drive human naive B cell differentiation into antibody-secreting cells abstract
Chapter 6
Single-cell analysis reveals dynamics of human B cell differentiation and identifies novel B and antibody-secreting cell intermediates abstract
Chapter 7
Summarizing discussion
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Download PhD thesis (university repository)
