title: Some evidence for the in vivo functional activation of suppressor T cells in asymptomatic patients with hemophilia A receiving Factor VIII concentrates.
abstract: Of 14 asymptomatic hemophilia A patients receiving factor VIII concentrates, 11 severe hemophilia patients had an inverted T-helper/suppressor ratio but 3 moderate patients had a normal ratio. Most hemophilia patients showed poor lymphocyte proliferative responses to mitogens and diminished in vitro immunoglobulin-producing ability of lymphocytes. One important finding was that most patients were found to have increased numbers of Ia-like antigen-positive suppressor T cells, suggesting that circulation activated suppressor T cells. In addition, OKT8+ suppressor T cells from severe hemophilia patients showed strong suppressor activity on B-cell differentiation in a Nocardia delipidated cell mitogen-driven system, whereas those from normal age-matched controls showed no suppressor function. These results suggested that suppressor T cells in hemophilia patients treated with factors might be already activated in vivo by undetermined mechanisms, implying the presence of a peculiar immunoregulatory status in this disease.
authors.forename: H
authors.initials: H
authors.lastname: Seki
authors.forename: K
authors.initials: K
authors.lastname: Taga
authors.forename: T
authors.initials: T
authors.lastname: Nagaoki
authors.forename: R
authors.initials: R
authors.lastname: Barot-Ciorbaru
authors.forename: T
authors.initials: T
authors.lastname: Miyawaki
authors.forename: N
authors.initials: N
authors.lastname: Taniguchi
mesh_terms: D000293:Adolescent; D000328:Adult; D000911:Antibodies, Monoclonal; D001402:B-Lymphocytes / Q000166:cytology; D002454:Cell Differentiation; D002648:Child; D002675:Child, Preschool; D005169:Factor VIII / Q000627:therapeutic use*; D006467:Hemophilia A / Q000188:drug therapy / Q000276:immunology*; D000949:Histocompatibility Antigens Class II / Q000032:analysis; D006801:Humans; D008213:Lymphocyte Activation; D008875:Middle Aged; D013601:T-Lymphocytes / Q000145:classification / Q000276:immunology*; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000949:Histocompatibility Antigens Class II; D005169:Factor VIII