INHIBITORY EFFECT OF LIPOPOLYSACCHARIDE ON IMMUNE-RESPONSE AFTER DNA IMMUNIZATION IS ROUTE DEPENDENT

Citation
Js. Boyle et al., INHIBITORY EFFECT OF LIPOPOLYSACCHARIDE ON IMMUNE-RESPONSE AFTER DNA IMMUNIZATION IS ROUTE DEPENDENT, DNA and cell biology, 17(4), 1998, pp. 343-348
Citations number
28
Categorie Soggetti
Cell Biology",Biology,"Genetics & Heredity
Journal title
ISSN journal
10445498
Volume
17
Issue
4
Year of publication
1998
Pages
343 - 348
Database
ISI
SICI code
1044-5498(1998)17:4<343:IEOLOI>2.0.ZU;2-9
Abstract
The DNA prepared from E. coli contained high levels of lipopolysacchar ide (LPS). When antigen-encoding DNA was injected into mice, toxicity and increased IgM responses were observed, A method for purifying high yields of DNA (up to 12 mg/L of broth culture) with very low levels o f LPS (0.05 ng/mg) was developed. When this purified DNA was used for immunization studies, the toxicity and increased IgM responses were ab rogated. Thus, LPS was added to DNA in order to examine its influence on the IgG and cytotoxic T lymphocyte (CTL) response after intramuscul ar (i.m.) or intradermal (i.d.) DNA immunization. The IgG response to DNA-encoded antigen was inhibited in a dose-dependent manner by the i. d., but not the i.m., route of immunization. Surprisingly, no effect o n the CTL response was observed. Therefore, the ability to produce hig h yields of plasmid DNA with very low levels of endotoxin contaminatio n is advantageous for DNA immunization studies, not only for toxicolog ic but also for immunologic considerations. Furthermore, these results provide further evidence that immune induction occurs via different m echanisms after i.m. and i.d. DNA immunization.