title: Inhibition of mitogen-induced cellular cytotoxicity by serum from patients with multiple myeloma.
abstract: Mitogen-induced cellular cytotoxicity (MICC) of peripheral blood mononuclear cells (PBMCs) against K562 cell targets was assessed in 24 patients with multiple myeloma (MM) using the 24 hours 51Cr-release assay. We found that PBMCs from MM patients exhibited normal MICC values when cells were isolated, washed and cultured in vitro in the absence of patients' serum. Patients' serum inhibited MICC of normal PBMCs stimulated by PHA. A strong positive correlation was found between percentages of inhibition and the amount of serum paraprotein in the patients studied, suggesting that paraprotein should be the main inhibitory component in this model of cytotoxicity. The possible inhibitory effect of serum paraprotein of MM patients on other types of cellular immunity remains to be elucidated.
authors.affiliation: Department of Hematology, University of Crete School of Medicine, University Hospital of Heraklion, Greece.
authors.forename: H
authors.initials: H
authors.lastname: Papadaki
authors.forename: J
authors.initials: J
authors.lastname: Konsolas
authors.forename: A
authors.initials: A
authors.lastname: Chatzivassili
authors.forename: G
authors.initials: G
authors.lastname: Katrinakis
authors.forename: A
authors.initials: A
authors.lastname: Foudoulakis
authors.forename: F
authors.initials: F
authors.lastname: Markidou
authors.forename: M
authors.initials: M
authors.lastname: Alexandrakis
authors.forename: D
authors.initials: D
authors.lastname: Kyriakou
authors.forename: G D
authors.initials: GD
authors.lastname: Eliopoulos
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003602:Cytotoxicity, Immunologic; D005260:Female; D006801:Humans; D007111:Immunity, Cellular; D007963:Leukocytes, Mononuclear / Q000276:immunology*; D008297:Male; D008875:Middle Aged; D008934:Mitogens / Q000276:immunology; D009101:Multiple Myeloma / Q000097:blood / Q000276:immunology*; D009194:Myeloma Proteins / Q000276:immunology*
chemical_list: D008934:Mitogens; D009194:Myeloma Proteins