title: Suppression of adjuvant arthritis in rats by induction of oral tolerance to mycobacterial 65-kDa heat shock protein.
abstract: Oral administration of mycobacterial 65-kDa heat shock protein (HSP) given daily for 5 days prior to immunization with Mycobacterium tuberculosis (Mt) suppressed the development of adjuvant arthritis (AA) in rats. AA was significantly suppressed by 30 and 300 micrograms HSP, and variably by 0.3, 3 micrograms or 1 mg. Histological analysis of joint samples obtained from control and test rats confirmed the suppression of AA in the fed group. Feeding Mt or hen egg lysozyme (HEL) failed to affect AA, indicating that the suppression was HSP specific. The oral administration of 30 micrograms HSP decreased both delayed-type hypersensitivity (DTH) reactions and proliferative responses to HSP and Mt. In addition, the proliferation of lymph node cells (LNC) from Mt-sensitized rats was inhibited by the addition of spleen cells (SPC) from HSP-fed animals, possibly by the secretion of transforming growth factor (TGF)-beta. Spleen cells obtained from tolerized donors were capable of transferring the tolerance to naive recipients. These results demonstrate that feeding HSP is an effective way to suppress AA and that the suppression of AA may be mediated by regulatory T cells generated following oral administration of mycobacterial 65-kDa HSP.
authors.affiliation: Department of Microbiology, Saga Medical School, Japan.
authors.forename: M A
authors.initials: MA
authors.lastname: Haque
authors.forename: S
authors.initials: S
authors.lastname: Yoshino
authors.forename: S
authors.initials: S
authors.lastname: Inada
authors.forename: H
authors.initials: H
authors.lastname: Nomaguchi
authors.forename: O
authors.initials: O
authors.lastname: Tokunaga
authors.forename: O
authors.initials: O
authors.lastname: Kohashi
mesh_terms: D000284:Administration, Oral; D019264:Adoptive Transfer; D000821:Animal Feed; D000818:Animals; D000942:Antigens, Bacterial / Q000008:administration & dosage / Q000627:therapeutic use; D001169:Arthritis, Experimental / Q000276:immunology* / Q000473:pathology / Q000517:prevention & control*; D001426:Bacterial Proteins; D018834:Chaperonin 60; D018833:Chaperonins / Q000008:administration & dosage* / Q000627:therapeutic use*; D018920:Coculture Techniques; D005260:Female; D006968:Hypersensitivity, Delayed / Q000209:etiology; D007108:Immune Tolerance; D008198:Lymph Nodes; D009169:Mycobacterium tuberculosis / Q000378:metabolism; D051381:Rats; D011917:Rats, Inbred Lew; D013154:Spleen; D016212:Transforming Growth Factor beta / Q000096:biosynthesis
chemical_list: D000942:Antigens, Bacterial; D001426:Bacterial Proteins; D018834:Chaperonin 60; D016212:Transforming Growth Factor beta; C074119:heat-shock protein 65, Mycobacterium; D018833:Chaperonins