title: Activation-induced expression of carcinoembryonic antigen-cell adhesion molecule 1 regulates mouse T lymphocyte function.
abstract: Carcinoembryonic Ag cell adhesion molecule 1 (CEACAM1) consists of highly related homologs in humans and rodents that are characterized by significant alternate splicing generating isoforms capable of negative intracellular signaling by virtue of two immunoreceptor tyrosine-based inhibition motifs in its cytoplasmic (cyt) tail. Although human T cells have been recently observed to express CEACAM1, the expression and function of CEACAM1 in mouse T cells have not been defined. Although resting mouse spleen T cells exhibited no evidence of CEACAM1 on the cell surface, CEACAM1 was rapidly up-regulated on CD4+ and CD8+ T cells after activation with either Con A or anti-CD3 without a requirement for either de novo transcription or translation due to the fact that CEACAM1 was present intracellularly before activation. Using a GST-CEACAM1-cytoplasmic tail fusion protein, it was shown that the cytoplasmic tail of CEACAM1 bound the src homology domain-containing phosphatase 1 and adaptor protein 1 complex in its phosphorylated and nonphosphorylated states, respectively. CEACAM1 ligation with an anti-CEACAM1 mAb resulted in inhibition of an allogeneic MLR and anti-CD3 plus anti-CD28 Ab-induced proliferation of spleen T cells in vitro and inhibition of a delayed-type hypersensitivity response to oxazolone in vivo. Inhibition of the delayed-type hypersensitivity response required that the anti-CEACAM1-specific mAb be present at the time of T cell sensitization. These studies support a role for CEACAM1 as a novel class of immunoreceptor tyrosine-based inhibition motif-bearing regulatory molecules on T cells that are active during early phases of the immune response in mice.
authors.affiliation: Gastroenterology Division, Departments of Medicine and Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Nakajima
authors.forename: Hideki
authors.initials: H
authors.lastname: Iijima
authors.forename: Markus F
authors.initials: MF
authors.lastname: Neurath
authors.forename: Takashi
authors.initials: T
authors.lastname: Nagaishi
authors.forename: Edward E S
authors.initials: EE
authors.lastname: Nieuwenhuis
authors.forename: Raktima
authors.initials: R
authors.lastname: Raychowdhury
authors.forename: Jonathan
authors.initials: J
authors.lastname: Glickman
authors.forename: Dianna M
authors.initials: DM
authors.lastname: Blau
authors.forename: Sara
authors.initials: S
authors.lastname: Russell
authors.forename: Kathryn V
authors.initials: KV
authors.lastname: Holmes
authors.forename: Richard S
authors.initials: RS
authors.lastname: Blumberg
mesh_terms: D033942:Adaptor Proteins, Vesicular Transport; D000818:Animals; D000911:Antibodies, Monoclonal / Q000008:administration & dosage; D015703:Antigens, CD / Q000096:biosynthesis* / Q000276:immunology / Q000378:metabolism / Q000502:physiology; D000943:Antigens, Differentiation / Q000096:biosynthesis* / Q000276:immunology / Q000378:metabolism / Q000502:physiology; D002272:Carcinoembryonic Antigen / Q000096:biosynthesis* / Q000276:immunology / Q000378:metabolism / Q000502:physiology; D002352:Carrier Proteins / Q000378:metabolism; D015815:Cell Adhesion Molecules / Q000096:biosynthesis* / Q000276:immunology / Q000378:metabolism / Q000502:physiology; D002462:Cell Membrane / Q000276:immunology / Q000378:metabolism; D002478:Cells, Cultured; D007274:Injections, Intraperitoneal; D007399:Interphase / Q000276:immunology; D047908:Intracellular Signaling Peptides and Proteins; D008024:Ligands; D008213:Lymphocyte Activation; D008297:Male; D008565:Membrane Proteins / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D054645:Protein Phosphatase 1; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6; D017027:Protein Tyrosine Phosphatases / Q000378:metabolism; D054593:SH2 Domain-Containing Protein Tyrosine Phosphatases; D013601:T-Lymphocytes / Q000166:cytology / Q000276:immunology* / Q000378:metabolism*; D013997:Time Factors; D018909:src Homology Domains / Q000276:immunology
chemical_list: D033942:Adaptor Proteins, Vesicular Transport; D000911:Antibodies, Monoclonal; D015703:Antigens, CD; D000943:Antigens, Differentiation; C069847:CD66 antigens; D002272:Carcinoembryonic Antigen; D002352:Carrier Proteins; C486183:Ceacam1 protein, mouse; D015815:Cell Adhesion Molecules; D047908:Intracellular Signaling Peptides and Proteins; D008024:Ligands; D008565:Membrane Proteins; D054645:Protein Phosphatase 1; C516724:PTPN11 protein, human; C509249:PTPN6 protein, human; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6; D017027:Protein Tyrosine Phosphatases; C516725:Ptpn11 protein, mouse; C509248:Ptpn6 protein, mouse; D054593:SH2 Domain-Containing Protein Tyrosine Phosphatases