Rc. Williams et al., EXPRESSION OF F4, 8.12, 31, AND 16 6 ANTI-DNA IDIOTYPE-RELATED ANTIGENS ON CATIONIC HUMAN-IGG MYELOMA PROTEINS/, Clinical immunology and immunopathology, 73(2), 1994, pp. 215-223
One hundred cationic isolated human IgG myeloma proteins were studied
for expression of four anti-DNA idiotypic (Id) markers F4, 3I, 8.12, a
nd 16/6. Forty-three of 100 myelomas showed the presence of at least o
ne anti-DNA idiotype. Twenty-seven were F4 positive, 18 were 16/6 posi
tive, 8 were 3I positive, and 7 were positive for 8.12. Two different
anti-DNA idiotypic markers were found together on the same 14 myeloma
proteins and 3 myelomas showed three different anti-DNA Ids. Anti-DNA
activity was found on only 1 of 100 myelomas but not associated with p
resence of an anti-DNA Id. Ten myelomas showed anti-F(ab')(2) activity
and 6 of these also showed the presence of an anti-DNA Id marker. Whe
n myeloma proteins expressing anti-DNA Ids were compared in direct com
petition ELISAs with known Id-positive human IgG anti-DNA antibodies,
much less inhibition was recorded in comparison to known human anti-DN
A antibodies. Our findings indicate that human IgG myeloma proteins ma
y show positive reactions with anti-DNA idiotypic antibodies but do no
t express the complete anti-DNA idiotypic antigenic complex. (C) 1994
Academic Press, Inc.