title: Immunomodulator, LZ-8, prevents antibody production in mice.
abstract: LZ-8, a new and recently discovered immunomodulator from Ganoderma lucidum, has been shown to have immunosuppressive activity in vivo and to be a member of the immunoglobulin superfamily. In this paper we examined the in vivo effect of LZ-8 on antibody production using the hepatitis B surface antigen (HBs Ag) in mice. LZ-8 had mitogenic activity in vitro towards spleen cells of C57BL/10 (B10) and C57BL/10BR (B10BR) as previously shown towards those of DBA/2 mice. B10 and B10BR mice produced anti-HBs Ag antibody by the twice sensitization of the antigen while intraperitoneal administration of LZ-8 twice weekly into the mice (8 and 12 mg/kg) greatly prevented the production of antibody to HBs Ag (83.3-96.8% inhibition). We further examined the effect of LZ-8 administration on mitogen responsibility of spleen cells and on the T-cell subset population in both the spleen and lymph node but no significant differences were observed between the LZ-8 treated and untreated mice. These results suggest that the immunosuppressive activities of LZ-8, previously shown, such as the prevention of systemic anaphylaxis and the Arthus reactions, were caused by the blocking of antigen-specific antibody production.
authors.affiliation: Biochemical Genetics Division, Meiji Institute of Health Science, Kanagawa, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kino
authors.forename: T
authors.initials: T
authors.lastname: Sone
authors.forename: J
authors.initials: J
authors.lastname: Watanabe
authors.forename: A
authors.initials: A
authors.lastname: Yamashita
authors.forename: H
authors.initials: H
authors.lastname: Tsuboi
authors.forename: H
authors.initials: H
authors.lastname: Miyajima
authors.forename: H
authors.initials: H
authors.lastname: Tsunoo
mesh_terms: D000276:Adjuvants, Immunologic / Q000494:pharmacology*; D000818:Animals; D000917:Antibody Formation; D005260:Female; D005656:Fungal Proteins / Q000276:immunology / Q000494:pharmacology*; D006510:Hepatitis B Antibodies / Q000096:biosynthesis; D006514:Hepatitis B Surface Antigens / Q000276:immunology; D066298:In Vitro Techniques; D008214:Lymphocytes / Q000276:immunology / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D008934:Mitogens; D016176:T-Lymphocyte Subsets / Q000276:immunology; D013936:Thymidine / Q000378:metabolism
chemical_list: D000276:Adjuvants, Immunologic; D005656:Fungal Proteins; D006510:Hepatitis B Antibodies; D006514:Hepatitis B Surface Antigens; D008934:Mitogens; C061148:LZ-8 protein, Ganoderma lucidum; D013936:Thymidine