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 Cardell, Lydia Sorokin
Abstract
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 PDGFrecβ high CCL19 low gp38 low fibroblastic reticular cells (FRC). In the absence of FRC expression of laminin α5 ( pdgfrb-cre:Lama5 fl/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:Lama5 fl/fl mice, but cDC2s, which localize to laminin α5 in RFs at follicle borders, are reduced. In addition, PDGFrecβ high CCL19 low gp38 low 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.