title: Synchrony of high endothelial venules and lymphatic vessels revealed by immunization.
abstract: The mature phenotype of peripheral lymph node (LN) high endothelial venules (HEVs), defined as MAdCAM-1(low) PNAd(high) LTbetaR(high) HEC-6ST(high), is dependent on signaling through the lymphotoxin-beta receptor (LTbetaR). Plasticity of PLN HEVs during immunization with oxazolone was apparent as a reversion to an immature phenotype (MAdCAM-1(high) PNAd(low) LTbetaR(low) HEC-6ST(low)) followed by recovery to the mature phenotype. The recovery was dependent on B cells and was inhibited by LTbetaR-Ig treatment. Concurrent with HEV reversion, at day 4 following oxazolone or OVA immunization, reduced accumulation of Evans blue dye and newly activated DCs in the draining LNs revealed a temporary afferent lymphatic vessel (LV) functional insufficiency. T cell priming to a second Ag was temporarily inhibited. At day 7, lymphangiogenesis peaked in both the skin and draining LN, and afferent LV function was restored at the same time as HEV phenotype recovery. This process was delayed in the absence of B cells. LV and HEV both express the LTbetaR. During lymphangiogenesis in the draining LN, HEV, and LV were directly apposed; some vessels appeared to express both PNAd and LYVE-1. Pretreatment with LTbetaR-Ig drastically reduced the number of PNAd+ LYVE-1+ vessels, suggesting a reduction in LV and HEV cross-talk. The concordance in time and function and the close physical contact between LVs and HEVs in the remodeling process after immunization indicate that the two vascular systems are in synchrony and engage in cross-talk through B cells and LTbetaR.
authors.affiliation: Department of Epidemiology and Public Health and Section of Immunobiology, Yale University School of Medicine, New Haven, CT 06520, USA.
authors.forename: Shan
authors.initials: S
authors.lastname: Liao
authors.forename: Nancy H
authors.initials: NH
authors.lastname: Ruddle
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology / Q000378:metabolism; D015415:Biomarkers; D015815:Cell Adhesion Molecules / Q000378:metabolism; D002450:Cell Communication / Q000276:immunology; D002478:Cells, Cultured; D003713:Dendritic Cells / Q000276:immunology; D015536:Down-Regulation; D004727:Endothelium / Q000276:immunology / Q000378:metabolism; D007114:Immunization; D042583:Lymphangiogenesis / Q000276:immunology; D042601:Lymphatic Vessels / Q000276:immunology* / Q000378:metabolism; D053259:Lymphotoxin beta Receptor; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009088:Mucoproteins; D010081:Oxazolone / Q000276:immunology; D010641:Phenotype; D018124:Receptors, Tumor Necrosis Factor / Q000378:metabolism; D013601:T-Lymphocytes / Q000276:immunology / Q000378:metabolism; D013997:Time Factors; D014699:Venules / Q000276:immunology* / Q000378:metabolism
chemical_list: D015415:Biomarkers; D015815:Cell Adhesion Molecules; C505699:Ltbr protein, mouse; D053259:Lymphotoxin beta Receptor; C489082:Madcam1 protein, mouse; D009088:Mucoproteins; D018124:Receptors, Tumor Necrosis Factor; D010081:Oxazolone