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Lack of Both Nucleotide-Binding Oligomerization Domain-Containing Proteins 1 and 2 Primes T Cells for
Sashi G Kasimsetty1, Alana A Shigeoka1, Andrew A Scheinok1
1Division of Nephrology and Hypertension, Department of Medicine, University of California, San Diego, La Jolla, CA 92093; and.
Abstract:
Nucleotide-binding oligomerization domain (Nod)-containing proteins Nod1 and Nod2 play important roles in the innate immune response to pathogenic microbes, but mounting data suggest these pattern recognition receptors might also play key roles in adaptive immune responses. Targeting Nod1 and Nod2 signaling pathways in T cells is likely to provide a new strategy to modify inflammation in a variety of disease states, particularly those that depend on Ag-induced T cell activation. To better understand how Nod1 and Nod2 proteins contribute to adaptive immunity, this study investigated their role in alloantigen-induced T cell activation and asked whether their absence might impact in vivo alloresponses using a severe acute graft versus host disease model. The study provided several important observations. We found that the simultaneous absence of Nod1 and Nod2 primed T cells for activation-induced cell death. T cells from Nod1 × 2 mice rapidly underwent cell death upon exposure to alloantigen. The Nod1 × 2 T cells had sustained p53 expression that was associated with downregulation of its negative regulator MDM2. In vivo, mice transplanted with an inoculum containing Nod1 × 2 T cells were protected from severe graft versus host disease. The results show that the simultaneous absence of Nod1 and Nod2 is associated with accelerated T cell death upon alloantigen encounter, suggesting these proteins might provide new targets to ameliorate T cell responses in a variety of inflammatory states, including those associated with bone marrow or solid organ transplantation.
Insights
The absence of Nucleotide-binding oligomerization domain (Nod)1 and Nod2 proteins accelerates T cell death upon encountering foreign antigens. This finding suggests Nod1 and Nod2 as potential targets for managing inflammatory conditions, including transplant rejection.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- Nucleotide-binding oligomerization domain (Nod)-containing proteins Nod1 and Nod2 are pattern recognition receptors crucial for innate immunity against microbes.
- Emerging evidence indicates Nod1 and Nod2 also significantly influence adaptive immune responses, particularly T cell activation.
Purpose of the Study:
- To investigate the role of Nod1 and Nod2 in alloantigen-induced T cell activation.
- To determine the impact of Nod1 and Nod2 absence on in vivo alloresponses within a graft-versus-host disease model.
Main Methods:
- Utilized a mouse model lacking both Nod1 and Nod2 (Nod1 x 2 mice).
- Assessed T cell activation-induced cell death upon exposure to alloantigen.
- Analyzed p53 and MDM2 expression in T cells.
- Evaluated graft-versus-host disease severity in vivo following transplantation with Nod1 x 2 T cells.
Main Results:
- Simultaneous absence of Nod1 and Nod2 primes T cells for accelerated activation-induced cell death.
- T cells from Nod1 x 2 mice exhibited rapid cell death upon alloantigen stimulation.
- Sustained p53 expression and downregulated MDM2 were observed in Nod1 x 2 T cells.
- Mice receiving Nod1 x 2 T cells showed protection from severe graft-versus-host disease.
Conclusions:
- The simultaneous absence of Nod1 and Nod2 leads to heightened T cell death following alloantigen recognition.
- Nod1 and Nod2 signaling pathways in T cells represent potential therapeutic targets for modulating inflammatory responses.
- Targeting Nod1 and Nod2 could offer novel strategies for managing immune-related conditions, including transplantation.
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