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Rapid In Vivo Assessment of Adjuvant's Cytotoxic T Lymphocytes Generation Capabilities for Vaccine Development
Published on: June 19, 2018
Adjuvant immunotherapy is dependent on inducible nitric oxide synthase
D A Kahn1, D C Archer, D P Gold
1Biomedical Sciences Graduate Program, University of California at San Diego, San Diego, CA 92093, USA.
The Journal of Experimental Medicine
|June 8, 2001
Summary
Complete Freund's adjuvant (CFA) protects against autoimmune disease by activating nitric oxide synthase 2 (NOS2). This mechanism involves reduced inflammation and altered immune responses, highlighting NOS2's crucial role in immune modulation.
Area of Science:
- Immunology
- Neuroscience
- Molecular Biology
Background:
- Complete Freund's adjuvant (CFA) confers resistance to autoimmune disease induction, unlike incomplete Freund's adjuvant (IFA).
- Mycobacterial components in CFA stimulate inducible nitric oxide synthase 2 (NOS2) gene expression.
- NOS2 activation is associated with suppressed T cell proliferation and modified immune responses.
Purpose of the Study:
- To investigate if functional NOS2 is required for the immunoprotective effects of CFA.
- To elucidate the role of NOS2 in modulating immune responses following CFA immunization.
Main Methods:
- CFA immunization was used to induce experimental allergic encephalomyelitis (EAE) in wild-type and NOS2-deficient (NOS2(-/-)) mice.
- Gene expression of NOS2, type I tumor necrosis factor alpha receptor (TNFR1), and interferon gamma were analyzed.
- Immune responses, including MOG-specific IgG1, interleukin-6 production, and central nervous system infiltrates, were assessed.
Main Results:
- CFA-immunized wild-type mice were protected from EAE, while NOS2(-/-) mice remained susceptible.
- NOS2 expression was chronically elevated in CFA-immunized mice and required TNFR1 and interferon gamma for maximal induction.
- NOS2-dependent effects included increased MOG-specific IgG1, decreased interleukin-6 production, and reduced CNS mononuclear cell infiltration.
Conclusions:
- The immunoprotective effect of CFA against EAE is dependent on functional NOS2.
- CFA immunization modulates immune responses via a nitric oxide-dependent mechanism.
- NOS2 plays a critical role in regulating autoimmune disease development and associated immune cell responses.
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