Freund's adjuvant, NOD2 and mycobacteria.
Marcel A Behr1, Maziar Divangahi2
1Department of Medicine, McGill University Health Centre, Montreal, Quebec H3G 1A4, Canada; McGill International TB Centre, Montreal H3G 1A4, Canada.
Current Opinion in Microbiology
|December 9, 2014
Summary
Mycobacterium tuberculosis uses a unique N-glycolyl MDP in its cell wall, which is more potent in activating Nucleotide-binding oligomerization domain-containing protein 2 (NOD2) and driving immune responses.
Area of Science:
- Immunology
- Microbiology
- Biochemistry
Background:
- Mycobacterium tuberculosis (Mtb) is historically linked to delayed-type hypersensitivity and cell-mediated immunity.
- The biochemical mechanisms underlying Mtb's cell wall immunogenicity were previously unclear.
Purpose of the Study:
- To elucidate the biochemical basis of Mtb cell wall immunogenicity.
- To investigate the role of Nucleotide-binding oligomerization domain-containing protein 2 (NOD2) in Mtb recognition.
Main Methods:
- Analysis of peptidoglycan structure in Mtb.
- Assessment of NOD2 activation by different muramyl dipeptide (MDP) forms.
- Evaluation of innate and adaptive immune responses.
Main Results:
- Mtb produces N-glycolyl MDP, a modified form distinct from the N-acetyl MDP found in most bacteria.
- Disrupting N-glycolyl MDP synthesis in Mtb significantly reduces NOD2-mediated sensing.
- N-glycolyl MDP demonstrates higher potency and efficacy than N-acetyl MDP in stimulating innate immunity and T cell responses.
Conclusions:
- NOD2's sensitivity to Mtb peptidoglycan may connect innate and adaptive immunity during tuberculosis infection.
- The unique N-glycolyl MDP structure is crucial for Mtb's interaction with the host immune system.
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