title: neonatally primed lymph node, but not splenic T cells, display a Gly-Gly motif within the TCR beta-chain complementarity-determining region 3 that controls affinity and may affect lymphoid organ retention.
abstract: Ig-proteolipid protein 1 (Ig-PLP1) is an Ig chimera expressing the encephalitogenic PLP1 peptide corresponding to amino acid residues 139-151 of PLP. Newborn mice given Ig-PLP1 in saline on the day of birth and challenged 7 wk later with PLP1 peptide in CFA develop an organ-specific neonatal immunity that confers resistance against experimental allergic encephalomyelitis. The T cell responses in these animals are comprised of Th2 cells in the lymph node and anergic Th1 lymphocytes in the spleen. Intriguingly, the anergic splenic T cells, although nonproliferative and unable to produce IFN-gamma or IL-4, secrete significant amounts of IL-2. Studies were performed to determine whether the two populations display any structural differences in the TCR H chain variable region that could contribute to the differential affinity and retention in different organs. Responsive Th2 lymph node T cells and anergic splenic lymphocytes were immortalized, and the structures of their TCR Vbeta were determined. The results show that Vbeta and Jbeta usage was random, but the CDR3 regions of the lymph node cells had a conserved Gly-Gly motif. Analysis of TCR affinity/avidity correlated the Gly-Gly motif with lower affinity and retention of the Th2 cells in the lymph node. Also, it is suggested that a higher TCR affinity may be a contributing factor for the development of the neonatal Th1 response in the spleen.
authors.affiliation: Department of Molecular Microbiology and Immunology, University of Missouri School of Medicine, Columbia, MO 65212, USA.
authors.forename: Jacque C
authors.initials: JC
authors.lastname: Caprio-Young
authors.forename: J Jeremiah
authors.initials: JJ
authors.lastname: Bell
authors.forename: Hyun-Hee
authors.initials: HH
authors.lastname: Lee
authors.forename: Jason
authors.initials: J
authors.lastname: Ellis
authors.forename: Danielle
authors.initials: D
authors.lastname: Nast
authors.forename: Gary
authors.initials: G
authors.lastname: Sayler
authors.forename: Booki
authors.initials: B
authors.lastname: Min
authors.forename: Habib
authors.initials: H
authors.lastname: Zaghouani
mesh_terms: D020816:Amino Acid Motifs; D000818:Animals; D000831:Animals, Newborn; D001483:Base Sequence; D017635:Clonal Anergy; D022801:Complementarity Determining Regions / Q000737:chemistry* / Q000235:genetics / Q000276:immunology; D004797:Enzyme-Linked Immunosorbent Assay; D005434:Flow Cytometry; D006825:Hybridomas; D008198:Lymph Nodes / Q000166:cytology* / Q000276:immunology; D051379:Mice; D008969:Molecular Sequence Data; D018991:Myelin Proteolipid Protein / Q000276:immunology; D009419:Nerve Tissue Proteins / Q000276:immunology; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000737:chemistry* / Q000235:genetics / Q000276:immunology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013154:Spleen / Q000166:cytology* / Q000276:immunology; D013601:T-Lymphocytes / Q000166:cytology* / Q000276:immunology
chemical_list: D022801:Complementarity Determining Regions; D018991:Myelin Proteolipid Protein; D009419:Nerve Tissue Proteins; C047516:Plp1 protein, mouse; D016693:Receptors, Antigen, T-Cell, alpha-beta