Abstract
The CD28 costimulation at TCR signaling plays a pivotal role in the regulation of the T cell response. To elucidate the role of T cells in periodontal disease, a system of cell transfer with TCR/CD28-dependent Th1 or Th2 clones was developed in rats. Gingival injection of specific Ag, Actinobacillus actinomycetemcomitans 29-kDa outer membrane protein, and LPS could induce local bone resorption 10 days after the transfer of Ag-specific Th1 clone cells, but not after transfer of Th2 clone cells. Interestingly, the presence of LPS was required not only for the induction of bone resorption but also for Ag-specific IgG2a production. LPS injection elicited the induction of expression of both B7-1 and B7-2 expression on gingival macrophages, which otherwise expressed only MHC class II when animals were injected with Ag alone. The expression of B7 molecules was observed for up to 3 days, which corresponded to the duration of retention of T clone cells in gingival tissues. Either local or systemic administration of CTLA4Ig, a functional antagonist of CD28 binding to B7, could abrogate the bone resorption induced by Th1 clone cells combined with gingival challenge with both Ag and LPS. These results suggest that local Ag-specific activation of Th1-type T cells by B7 costimulation appeared to trigger inflammatory bone resorption, whereas inhibition of B7 expression by CTLA4Ig might be a therapeutic approach for intervention with inflammatory bone resorption.
Publication types
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Abatacept
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Acid Phosphatase / biosynthesis
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Alveolar Bone Loss / enzymology
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Alveolar Bone Loss / pathology
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Animals
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Antigens, CD / biosynthesis
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Antigens, Differentiation / administration & dosage
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Antigens, Differentiation / therapeutic use
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B7-1 Antigen / administration & dosage
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B7-1 Antigen / genetics
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B7-1 Antigen / physiology*
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B7-2 Antigen
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Bone Resorption / enzymology
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Bone Resorption / immunology*
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Bone Resorption / pathology
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Bone Resorption / prevention & control
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CTLA-4 Antigen
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Clone Cells / immunology
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Clone Cells / transplantation
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Female
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Gingiva / cytology
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Gingiva / immunology
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Histocompatibility Antigens Class II / biosynthesis
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Humans
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Immunoconjugates*
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Immunoglobulin G / biosynthesis
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Injections, Intravenous
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Isoenzymes / biosynthesis
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Kinetics
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Lipopolysaccharides / administration & dosage
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Lymph Nodes / cytology
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Lymph Nodes / immunology
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Macrophages / immunology
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Macrophages / metabolism
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Membrane Glycoproteins / biosynthesis
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Microinjections
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Neck
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Periodontitis / enzymology
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Periodontitis / immunology*
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Periodontitis / pathology
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RNA, Messenger / biosynthesis
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Rats
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Rats, Inbred Strains
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Spleen / cytology
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Spleen / immunology
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Tartrate-Resistant Acid Phosphatase
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Th1 Cells / immunology*
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Th1 Cells / transplantation
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Th2 Cells / transplantation
Substances
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Antigens, CD
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Antigens, Differentiation
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B7-1 Antigen
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B7-2 Antigen
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CD86 protein, human
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CTLA-4 Antigen
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CTLA4 protein, human
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Cd86 protein, rat
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Ctla4 protein, rat
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Histocompatibility Antigens Class II
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Immunoconjugates
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Immunoglobulin G
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Isoenzymes
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Lipopolysaccharides
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Membrane Glycoproteins
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RNA, Messenger
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Abatacept
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Acid Phosphatase
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Tartrate-Resistant Acid Phosphatase