title: Mycobacterial cord factor, but not sulfolipid, causes depletion of NKT cells and upregulation of CD1d1 on murine macrophages.
abstract: Trehalose 6,6'-dimycolate (TDM, cord factor) has frequently been used as an adjuvant to stimulate antibody production. Although it also induces cellular immunity, detailed studies about the underlying events do not exist. To determine the kinetics of TDM-specific changes promoting a T helper 1 (Th1) response, we injected mice with TDM or 2,3,6,6'-tetraacyl trehalose 2'-sulfate (SL, sulfolipid), another mycobacterial trehalose-containing glycolipid without mycolic acid. TDM, but not SL, caused a strong increase in serum interferon-gamma (IFN-gamma) levels 2 days later, accompanied by expansion of natural killer (NK) cells. Subsequent TDM effects included depletion of normal-density CD4(+) NK1.1(+) TCRalpha/beta(intermediate) cells from day 7 on, upregulation of MHC class II and CD1d1 on macrophages (peaking on day 21), and an increased proportion of Th1 cells evident after 3 weeks. TDM, but not a similar glycolipid without mycolic acid, can therefore initiate a cascade of events starting with strong release of IFN-gamma and NK cell expansion, resulting in the appearance of macrophages activated for antigen presentation. Our data therefore provide the basis for optimized immunization schedules with TDM as the adjuvant component of a Th1 vaccine.
authors.affiliation: Japan BCG Laboratory, 3-1-5 Matsuyama, Kiyose, 204-0022, Tokyo, Japan. ryll@jet.sci.kitasato-u.ac.jp
authors.forename: R
authors.initials: R
authors.lastname: Ryll
authors.forename: K
authors.initials: K
authors.lastname: Watanabe
authors.forename: N
authors.initials: N
authors.lastname: Fujiwara
authors.forename: H
authors.initials: H
authors.lastname: Takimoto
authors.forename: R
authors.initials: R
authors.lastname: Hasunuma
authors.forename: Y
authors.initials: Y
authors.lastname: Kumazawa
authors.forename: M
authors.initials: M
authors.lastname: Okada
authors.forename: I
authors.initials: I
authors.lastname: Yano
mesh_terms: D000276:Adjuvants, Immunologic / Q000008:administration & dosage*; D000818:Animals; D018949:Antigens, CD1 / Q000378:metabolism*; D055610:Antigens, CD1d; D003311:Cord Factors / Q000008:administration & dosage / Q000276:immunology*; D005260:Female; D006801:Humans; D007371:Interferon-gamma / Q000097:blood; D007694:Killer Cells, Natural / Q000276:immunology*; D008055:Lipids / Q000008:administration & dosage* / Q000276:immunology; D008212:Lymphocyte Depletion; D008264:Macrophages / Q000276:immunology* / Q000378:metabolism; D051379:Mice; D009169:Mycobacterium tuberculosis / Q000276:immunology / Q000378:metabolism; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000378:metabolism; D018417:Th1 Cells / Q000276:immunology; D015854:Up-Regulation
chemical_list: D000276:Adjuvants, Immunologic; D018949:Antigens, CD1; D055610:Antigens, CD1d; C526877:CD1D protein, human; D003311:Cord Factors; D008055:Lipids; D016693:Receptors, Antigen, T-Cell, alpha-beta; C015518:sulfolipids; D007371:Interferon-gamma