title: Characterization of recombinant soluble carcinoembryonic antigen cell adhesion molecule 1.
abstract: Carcinoembryonic antigen cell adhesion molecule 1 (CEACAM1) is a type 1 transmembrane, homotypic cell adhesion protein expressed on epithelial and hematopoietic cells. CEACAM1 has four major isoforms with three or four immunoglobulin (Ig)-like ectodomains and either long or short cytoplasmic domains. In a 3D model of breast epithelial cell morphogenesis, CEACAM1 plays an essential role in lumen formation [J. Cell Sci. 112 (1999) 4193]. Two soluble ectodomain isoforms of CEACAM1 expressed in myeloma cells were immunologically active and highly glycosylated. The molecular weights of the 3-ecto- and 4-ectodomain isoforms were 90 and 110kDa, respectively, and monomers by sedimentation equilibrium centrifugation. Both isoforms were prolate ellipsoids with axial ratios of 6 for the 3-ecto- and 8 for 4-ectodomain isoforms, respectively, by size exclusion chromatography and analytical ultracentrifugation. Both isoforms caused a significant reduction in lumen formation when tested in the 3D model culture system.
authors.affiliation: Division of Immunology, Beckman Research Institute of the City of Hope, Duarte, CA 91010, USA.
authors.forename: Detlef
authors.initials: D
authors.lastname: Schumann
authors.forename: Jie
authors.initials: J
authors.lastname: Huang
authors.forename: Patrick E
authors.initials: PE
authors.lastname: Clarke
authors.forename: Julia
authors.initials: J
authors.lastname: Kirshner
authors.forename: Shih-wa
authors.initials: SW
authors.lastname: Tsai
authors.forename: Verne N
authors.initials: VN
authors.lastname: Schumaker
authors.forename: John E
authors.initials: JE
authors.lastname: Shively
mesh_terms: D000818:Animals; D015703:Antigens, CD / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D000943:Antigens, Differentiation / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D001943:Breast Neoplasms / Q000378:metabolism; D002272:Carcinoembryonic Antigen / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D015815:Cell Adhesion Molecules / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D045744:Cell Line, Tumor; D006801:Humans; D051379:Mice; D008970:Molecular Weight; D020033:Protein Isoforms; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D012995:Solubility; D014162:Transfection; D014461:Ultracentrifugation / Q000379:methods
chemical_list: D015703:Antigens, CD; D000943:Antigens, Differentiation; C069847:CD66 antigens; D002272:Carcinoembryonic Antigen; C486183:Ceacam1 protein, mouse; D015815:Cell Adhesion Molecules; D020033:Protein Isoforms; D011994:Recombinant Proteins