The extracellular matrix of lymph node reticular fibers modulates follicle border interactions and germinal center formation
Jian Song,
Tushar Deshpande,
Xueli Zhang,
Melanie-Jane Hannocks,
Nils Lycke,
Susanna L. Cardell,
Lydia Sorokin
Affiliations
Jian Song
Institute of Physiological Chemistry and Pathobiochemistry and Cells-in-Motion Interfaculty Centre (CIMIC), University of Muenster, 48149 Muenster, Germany; Corresponding author
Tushar Deshpande
Institute of Physiological Chemistry and Pathobiochemistry and Cells-in-Motion Interfaculty Centre (CIMIC), University of Muenster, 48149 Muenster, Germany
Xueli Zhang
Institute of Physiological Chemistry and Pathobiochemistry and Cells-in-Motion Interfaculty Centre (CIMIC), University of Muenster, 48149 Muenster, Germany
Melanie-Jane Hannocks
Institute of Physiological Chemistry and Pathobiochemistry and Cells-in-Motion Interfaculty Centre (CIMIC), University of Muenster, 48149 Muenster, Germany
Nils Lycke
Department of Microbiology and Immunology, University of Gothenburg, 40530 Gothenburg, Sweden
Susanna L. Cardell
Department of Microbiology and Immunology, University of Gothenburg, 40530 Gothenburg, Sweden
Lydia Sorokin
Institute of Physiological Chemistry and Pathobiochemistry and Cells-in-Motion Interfaculty Centre (CIMIC), University of Muenster, 48149 Muenster, Germany; Corresponding author
Summary: Germinal center (GC) formation and antibody production in lymph node follicles require coordinated interactions between B-cells, T-cells and dendritic cells (DCs), orchestrated by the extracellular matrix-rich reticular fiber (RF) network. We describe a unique laminin 523-containing RF network around and between follicles that associates with PDGFrecβhighCCL19lowgp38low fibroblastic reticular cells (FRC). In the absence of FRC expression of laminin α5 (pdgfrb-cre:Lama5fl/fl), pre-Tfh-cells, B-cells and DCs are displaced from follicle borders, correlating with fewer Tfh-cells and GC B-cells. Total DCs are not altered in pdgfrb-cre:Lama5fl/fl mice, but cDC2s, which localize to laminin α5 in RFs at follicle borders, are reduced. In addition, PDGFrecβhighCCL19lowgp38low FRCs show lower Ch25h expression, required for 7α,25-dihydroxycholesterol synthesis that attracts pre-Tfh-cells, B-cells and DCs to follicle borders. We propose that RF basement membrane components represent a type of tissue memory that guides the localization and differentiation of both specialized FRC and DC populations, required for normal lymph node function.
