Suppressor factors generated from human mononuclear cells by means of purified myeloma proteins.
Peripheral blood mononuclear cells (PBMC) from normal human donors were cultured in Marbrook flasks in the presence of purified IgG or IgA myeloma proteins. The culture supernatants were tested for their ability to suppress pokeweed mitogen (PWM)- or Epstein-Barr virus (EBV)-driven Ig synthesis by normal PBMC. Two supernatants from PBMC cultured with IgG and one from PBMC cultured with IgA were tested and suppressed PWM-driven Ig synthesis as measured by a reverse haemolytic plaque assay and by quantitation of the Ig secreted into the culture medium of the PWM-driven cells. This suppression was not restricted to the Ig isotype of the 'inducing' myeloma protein, but was extended to IgG, IgA, and IgM. The suppressive effect could be absorbed out with human IgG.
A G
AG
Wangel
S
S
Kontiainen
H
H
Arvilommi
M
M
Nuutinen
J
J
Koistinen
D000917:Antibody Formation; D002470:Cell Survival; D000939:Epitopes; D006801:Humans; D007126:Immunoglobulin Allotypes / Q000276:immunology; D008222:Lymphokines / Q000096:biosynthesis*; D009194:Myeloma Proteins / Q000494:pharmacology*; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*
D000939:Epitopes; D007126:Immunoglobulin Allotypes; D008222:Lymphokines; D009194:Myeloma Proteins