title: [B cell population and its autoimmune activity in the thymus of patients associated with myasthenia gravis].
abstract: Immunohistochemical studies using antibodies to B lymphocyte and to immunoglobulin G bearing cell were carried out for resected thymus-specimens of 10 patients associated with myasthenia gravis. In each case, abundant B cells (L26 positive cell) resided in the follicles and the medulla of thymus, especially, were congregated in the follicles developing germinal center and around Hassall's corpuscles. Amount of B cell population was various among each case regardless of type of myasthenia gravis or age. B cells were greatly increased in the thymus of patients with values of anti-acetylcholine receptor antibody titers over 100 nmol/l. Although numerous B cells were present in the thymus of these patients, IgG bearing cells were extremely rare. In the most cases, B cells lacked IgG expression. From the results, numerous B cells pre-activating autoimmune antibody production were accumulated in the thymus of patients associated with myasthenia gravis.
authors.affiliation: Department of Surgery, Saitama Medical Center, Saitama Medical School, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yoshitake
authors.forename: T
authors.initials: T
authors.lastname: Takahama
authors.forename: F
authors.initials: F
authors.lastname: Kanai
authors.forename: K
authors.initials: K
authors.lastname: Ohnishi
authors.forename: T
authors.initials: T
authors.lastname: Suzuki
authors.forename: Y
authors.initials: Y
authors.lastname: Kametani
authors.forename: S
authors.initials: S
authors.lastname: Itoyama
authors.forename: I
authors.initials: I
authors.lastname: Sugawara
authors.forename: A
authors.initials: A
authors.lastname: Matsunaga
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001323:Autoantibodies / Q000096:biosynthesis*; D001402:B-Lymphocytes / Q000276:immunology* / Q000473:pathology; D005260:Female; D006801:Humans; D008875:Middle Aged; D009157:Myasthenia Gravis / Q000276:immunology* / Q000473:pathology; D013950:Thymus Gland / Q000276:immunology* / Q000473:pathology
chemical_list: D001323:Autoantibodies