title: Disrupted splenic architecture, but normal lymph node development in mice expressing a soluble lymphotoxin-beta receptor-IgG1 fusion protein.
abstract: Early in ontogeny, the secondary lymphoid organs become populated with numerous cells of mesodermal origin which forms both the lymphoid and stromal elements. The critical receptor/ligand interactions necessary for lymphoid organogenesis to occur are for the most part unknown. Although lymphotoxin-alpha (LT alpha) has been shown to be required for normal lymph node, Peyer's patch, and splenic development, it is unclear if soluble LT alpha 3, and/or cell-bound lymphotoxin-alpha beta (LT alpha beta) mediate these developmental events. Here we report that blocking LT alpha beta/lymphotoxin-beta receptor (LT beta R) interaction in vivo by generating mice which express a soluble LT beta R-Fc fusion protein driven by the human cytomegalovirus promoter results in an array of anatomic abnormalities affecting both the spleen and Peyer's patches, but not the lymph nodes. These results demonstrate that surface LT alpha beta ligand plays a critical role in normal lymphoid organ development.
authors.affiliation: Department of Microbiology and Immunology, Stanford University School of Medicine, CA 94305, USA.
authors.forename: R
authors.initials: R
authors.lastname: Ettinger
authors.forename: J L
authors.initials: JL
authors.lastname: Browning
authors.forename: S A
authors.initials: SA
authors.lastname: Michie
authors.forename: W
authors.initials: W
authors.lastname: van Ewijk
authors.forename: H O
authors.initials: HO
authors.lastname: McDevitt
mesh_terms: D000375:Aging; D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology; D003587:Cytomegalovirus / Q000235:genetics; D006801:Humans; D007074:Immunoglobulin G / Q000096:biosynthesis* / Q000235:genetics; D008198:Lymph Nodes / Q000254:growth & development* / Q000276:immunology / Q000473:pathology; D053259:Lymphotoxin beta Receptor; D008233:Lymphotoxin-alpha / Q000378:metabolism; D053308:Lymphotoxin-beta; D008565:Membrane Proteins / Q000378:metabolism; D051379:Mice; D008822:Mice, Transgenic; D010581:Peyer's Patches / Q000254:growth & development* / Q000276:immunology / Q000473:pathology; D011401:Promoter Regions, Genetic; D018124:Receptors, Tumor Necrosis Factor / Q000096:biosynthesis* / Q000235:genetics; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis*; D013154:Spleen / Q000254:growth & development* / Q000276:immunology / Q000473:pathology; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D007074:Immunoglobulin G; C505886:LTB protein, human; C505697:LTBR protein, human; C505887:Ltb protein, mouse; C505699:Ltbr protein, mouse; D053259:Lymphotoxin beta Receptor; D008233:Lymphotoxin-alpha; D053308:Lymphotoxin-beta; D008565:Membrane Proteins; D018124:Receptors, Tumor Necrosis Factor; D011993:Recombinant Fusion Proteins