Abstract：
:We recently developed a novel immunomodulating gene fusion protein, CTA1-DD, that combines the ADP-ribosylating ability of cholera toxin (CT) with a dimer of an Ig-binding fragment, D, of Staphylococcus aureus protein A. The CTA1-DD adjuvant was found to be non-toxic and greatly augmented T cell dependent and independent responses. Following injection it binds to both naïve and memory B cells and up-regulates co-stimulatory molecules as well as prevents apoptosis of activated B cells. Here we show that CTA1-DD is a potent mucosal adjuvant administered intranasally. A dose-response analysis revealed that the adjuvant effect of CTA1-DD given intranasally was equally strong to that observed after systemic immunizations. The adjuvant effect was independent of any possible contamination with endotoxin as indicated by the similar enhancing effects of CTA1-DD in C3H/HeN and the LPS-insensitive C3H/HeJ mice. Contrary to many other adjuvants CTA1-DD induces an immune response to itself. However, despite the presence of high serum titers of pre-existing anti-CTA1 antibodies we observed no reduction of the adjuvant function of CTA1-DD when given either intranasally or systemically. These results support the notion that the CTA1-DD adjuvant can repeatedly be used in the clinic without loss of efficacy even when pre-existing anti-CTA1 antibody levels are high.
journal_name
Vaccinejournal_title
Vaccineauthors
Lycke N,Schön Kdoi
10.1016/s0264-410x(00)00487-4subject
Has Abstractpub_date
2001-03-21 00:00:00pages
2542-8issue
17-19eissn
0264-410Xissn
1873-2518pii
S0264410X00004874journal_volume
19pub_type
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