Related Experiment Videos
Iscoms with different quillaja saponin components differ in their immunomodulating activities
M Johansson1, K Lövgren-Bengtsson
1Department of Virology, The National Veterinary Institute, Uppsala, Sweden. margaretha.johansson@bmc.uu.se
Vaccine
|August 7, 1999
Summary
Different quillaja saponin fractions (A and C) in iscoms show distinct immune effects. Fraction A boosts cell proliferation and cytokines, while Fraction C enhances antibody production, particularly IgG2a.
Area of Science:
- Immunology
- Biochemistry
Background:
- Iscoms are potent vaccine adjuvants.
- Quillaja saponins are known for their immune-stimulating properties.
Purpose of the Study:
- To investigate the differential immunomodulatory activities of iscoms formulated with defined quillaja saponin fractions (A and C).
- To compare the effects of fraction A, fraction C, and a combined fraction (A+C) on immune responses.
Main Methods:
- Formulation of iscoms using quillaja saponin fractions A, C, and a combination (Iscoprep703).
- Assessment of antigen-specific proliferation, cytokine production (IL-2, IFN-gamma), and immunoglobulin G (IgG) subclass responses (including IgG2a).
Main Results:
- Fraction A iscoms enhanced antigen-specific proliferation and IL-2/IFN-gamma production but not IgG2a levels.
- Fraction C iscoms strongly promoted antibody production and modulated IgG subclass towards IgG2a, despite low IFN-gamma induction.
- Combined fraction A+C iscoms (Iscoprep703) elicited higher serum antibody responses and a stronger IgG2a modulation than individual fractions.
Conclusions:
- Defined quillaja saponin fractions possess distinct immunomodulatory profiles.
- Fraction A primarily drives cellular immune responses, while fraction C enhances humoral immunity and IgG2a subclass switching.
- Combining fractions A and C in iscoms offers synergistic benefits for vaccine adjuvant development.