title: Primary response of naive CD4(+) T cells to amino acid-substituted analogs of an antigenic peptide can show distinct activation patterns: Th1- and Th2-type cytokine secretion, and helper activity for antibody production without apparent cytokine secretion.
abstract: Naive CD4(+) T cells differentiate into two types of helper T cells showing an interferon-gamma-predominant (Th1) or an interleukin-4-predominant (Th2) cytokine secretion profile after repeated antigenic stimulation. Their differentiation can be influenced by slight differences in the interaction between the T cell receptor (TCR) and its ligand at the time of primary activation. However, the primary response of freshly isolated naive CD4(+) T cells to altered TCR ligands is still unclear. Here, we investigated the primary response of splenic naive CD4(+) T cells derived from transgenic mice expressing TCR specific for residues 323-339 of ovalbumin (OVA323-339) bound to I-A(d) molecules. Naive CD4(+) T cells secreted either Th1- or Th2-type cytokines immediately after stimulation with OVA323-339 or its single amino acid-substituted analogs. Helper activity for antibody secretion by co-cultured resting B cells was also found in the primary response, accompanied by either low-level Th2-type cytokine secretion or no apparent cytokine secretion. Our results clearly indicate that dichotomy of the Th1/Th2 cytokine secretion profile can be elicited upon primary activation of naive CD4(+) T cells. We also demonstrate that the helper activity of naive CD4(+) T cells for antibody production does not correspond to the amounts of the relevant cytokines secreted.
authors.affiliation: Department of Applied Biological Chemistry, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, Japan.
authors.forename: W
authors.initials: W
authors.lastname: Ise
authors.forename: M
authors.initials: M
authors.lastname: Totsuka
authors.forename: R
authors.initials: R
authors.lastname: Takato
authors.forename: S
authors.initials: S
authors.lastname: Hachimura
authors.forename: T
authors.initials: T
authors.lastname: Sato
authors.forename: A
authors.initials: A
authors.lastname: Ametani
authors.forename: Y
authors.initials: Y
authors.lastname: Kumagai
authors.forename: S
authors.initials: S
authors.lastname: Habu
authors.forename: S
authors.initials: S
authors.lastname: Kaminogawa
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000906:Antibodies / Q000276:immunology*; D000941:Antigens / Q000737:chemistry / Q000494:pharmacology*; D001402:B-Lymphocytes / Q000276:immunology; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology* / Q000378:metabolism; D018920:Coculture Techniques; D000949:Histocompatibility Antigens Class II / Q000737:chemistry / Q000494:pharmacology; D007376:Interleukin-2 / Q000032:analysis; D015847:Interleukin-4 / Q000032:analysis; D008213:Lymphocyte Activation; D051379:Mice; D008822:Mice, Transgenic; D008969:Molecular Sequence Data; D018417:Th1 Cells / Q000276:immunology; D018418:Th2 Cells / Q000276:immunology; D014409:Tumor Necrosis Factor-alpha / Q000032:analysis
chemical_list: D000906:Antibodies; D000941:Antigens; D000949:Histocompatibility Antigens Class II; C111389:I-Ad antigen; D007376:Interleukin-2; D014409:Tumor Necrosis Factor-alpha; D015847:Interleukin-4