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Nod1, Nod2 and Nalp3 receptors, new potential targets in treatment of allergic rhinitis?

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To cite this article: Bogefors J, Rydberg C, Uddman R, Fransson M, Månsson A, Benson M, Adner M, Cardell LO. Nod1, Nod2 and Nalp3 receptors, new potential targets in treatment of allergic rhinitis? Allergy 2010; 65: 1222–1226. Abstract Background: 

Recently, a new set of pattern-recognition receptors, the nucleotide-binding oligomerization domain (Nod)-like receptors (NLRs), have emerged. Their activation, either by allergens or microbes, triggers an inflammatory response. The knowledge about NLRs in human airways is limited. Aim of the study: 

To investigate presence of NLRs in the human nose of healthy individuals and patients with intermittent allergic rhinitis outside and during pollen season. Methods: 

The expression of Nod1, Nod2, and Nalp3 in nasal biopsies was determined with real-time RT-PCR and immunohistochemistry. Cultured primary human nasal epithelial cells (HNECs) were analyzed using real-time RT-PCR and flow cytometry to further verify the presence of NLRs in the epithelium. Results: 

Immunohistochemical analysis revealed presence of Nod1, Nod2, and Nalp3 in the nasal epithelium. This was corroborated in cultured HNECs. Patients suffering from symptomatic allergic rhinitis exhibited lower Nod1 and Nalp3 mRNA levels than both controls and patients during pollen season. Nod2 expression was found in all specimens tested, but no differences were seen between the three groups. Conclusion: 

Nod1, Nod2, and Nalp3 receptors were found to be present in the human nose. The expression of Nod1 and Nalp3 were down-regulated during pollen season among patients with allergic rhinitis. This opens up for new insights and novel therapeutic strategies in inflammatory airway disease.
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Keywords: NLRs; Nalp3; Nod1; Nod2; intermittent allergic rhinitis

Document Type: Research Article

Affiliations: 1: Department of Otorhinolaryngology, Malmö University Hospital, Lund University, Malmö, Sweden 2: Division of ENT diseases, CLINTEC, Huddinge, Karolinska Institutet, Stockholm, Sweden 3: Unit for Clinical Systems Biology, Department of Pediatrics, Queen Silvia Children’s Hospital, Gothenburg, Sweden 4: National Institute of Environmental medicine, Karolinska Institutet, Stockholm, Sweden

Publication date: October 1, 2010

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