Plasmid DNA encoding caprine interferon gamma inhibits antibody response to caprine arthritis-encephalitis virus (CAEV) surface protein encoded by a co-administered plasmid expressing CAEV env and tat genes
Wp. Cheevers et al., Plasmid DNA encoding caprine interferon gamma inhibits antibody response to caprine arthritis-encephalitis virus (CAEV) surface protein encoded by a co-administered plasmid expressing CAEV env and tat genes, VACCINE, 19(23-24), 2001, pp. 3209-3215
This study characterized immune responses of Saanen goats co-immunized with
pUC18 based plasmids expressing caprine arthritis-encephalitis virus (CAEV
) rev-env (pENV) or tat-rev-env (pTAT-ENV) and a second plasmid encoding ca
prine interferon gamma (IFN gamma). A previous study reported that immuniza
tion with pENV or pTAT-ENV induces IgG2 biased antibody responses to plasmi
d encoded CAEV surface envelope protein (SU). We show here that regional ly
mph nodes (LN) of pENV and pTAT-ENV immunized goats contain a dominant subs
et of SU activated IFN gamma (+) Th1 lymphocytes. Go-immunization with pENV
or pTAT-ENV and a caprine IFN gamma cDNA expression plasmid (pcIFN gamma)
did not potentiate activation of SU responsive Th1 lymphocytes. However, th
e antibody response to SU encoded by pTAT-ENV was inhibited by co-immunizat
ion with pcIFN gamma. Results indicate that synergistic effects of CAEV Tar
and IFN gamma suppress the: primary adaptive B cell response to plasmid en
coded SU. (C) 2001 Elsevier Science Ltd. All rights reserved.