title: Retinoic acid treated HL60 cells express CEACAM1 (CD66a) and phagocytose Neisseria gonorrhoeae.
abstract: Neisseria gonorrhoeae (gonococci, GC) are phagocytosed by neutrophils through the interaction between opacity proteins (Opa) and the CEA (CD66) family of antigens. In order to study this interaction, we used the human myeloid leukemia HL60 cell line, which differentiates into granulocyte-like cells upon treatment with dimethylsulfoxide (DMSO) or retinoic acid (RA). We found that RA-, but not DMSO- or untreated-HL60 cells, can phagocytose OpaI-expressing gonococci as well as Escherichia coli. The interaction of OpaI E. coli with RA-treated HL60 cells was inhibited by antibodies against CEACAM1. Phagocytosis of OpaI E. coli was found to be a result of the expression of CEACAM1 in RA-treated HL60 cells. Our results indicate that the level of expression of CEACAM1 in HL60 cells can be regulated by treatment with RA in a differentiation-dependent manner, and that this is important for phagocytosis of OpaI-expressing gonococci or E. coli.
authors.affiliation: Department of Microbiology and Immunology, Division of Infectious Diseases, Walther Oncology Center, Indiana University School of Medicine, Indianapolis, IN, USA.
authors.forename: Milica
authors.initials: M
authors.lastname: Pantelic
authors.forename: Ines
authors.initials: I
authors.lastname: Chen
authors.forename: James
authors.initials: J
authors.lastname: Parker
authors.forename: Pei
authors.initials: P
authors.lastname: Zhang
authors.forename: Fritz
authors.initials: F
authors.lastname: Grunert
authors.forename: Tie
authors.initials: T
authors.lastname: Chen
mesh_terms: D000942:Antigens, Bacterial / Q000378:metabolism; D015703:Antigens, CD / Q000378:metabolism*; D000943:Antigens, Differentiation / Q000378:metabolism*; D015815:Cell Adhesion Molecules; D002454:Cell Differentiation; D004121:Dimethyl Sulfoxide / Q000494:pharmacology; D004926:Escherichia coli / Q000276:immunology; D018922:HL-60 Cells; D006801:Humans; D009344:Neisseria gonorrhoeae / Q000276:immunology*; D009504:Neutrophils / Q000166:cytology / Q000187:drug effects / Q000276:immunology*; D010587:Phagocytosis; D014212:Tretinoin / Q000494:pharmacology*
chemical_list: D000942:Antigens, Bacterial; D015703:Antigens, CD; D000943:Antigens, Differentiation; C069847:CD66 antigens; D015815:Cell Adhesion Molecules; C050308:opacity proteins; D014212:Tretinoin; D004121:Dimethyl Sulfoxide