Scholarly article on topic 'OR5-001 – Characterization of tonsil infiltration in PFAPA'

OR5-001 – Characterization of tonsil infiltration in PFAPA Academic research paper on "Veterinary science"

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Pediatr Rheumatol
OECD Field of science

Academic research paper on topic "OR5-001 – Characterization of tonsil infiltration in PFAPA"

Chiesa et al. Pediatric Rheumatology 2013, 11(Suppl 1):A94



OR5-001 - Characterization of tonsil infiltration in PFAPA

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S Chiesa , R Caorsi , F Penco , A Bertoni , S Borghini , A Sementa , A Omenetti , F Bellora , R D'Agostino , A Martini1, M Gattorno1

From 7th Congress of International Society of Systemic Auto-Inflammatory Diseases (ISSAID) Lausanne, Switerland. 22-26 May 2013


The syndrome of periodic fever, aphthous stomatitis, pharyngitis, and cervical adenitis (PFAPA) is the most common periodic fever disease in young children. The etiology of this disorder is still unknown. Palatine tonsils are sites where innate immunity leads to onset of the adaptive immunity, mediated by B and T lymphocytes. Three families of pathogen sensors mediate the recognition of microbes: Toll-like receptors (TLRs), NOD-like receptors (NLRs) and RIG-I-like receptors (RLRs). The interplay of these receptors ensures the efficient coordination of innate immune responses.


We aimed to investigate differences in leukocyte subpopulations and innate receptors gene expression of palatine tonsil cells from patients with PFAPA in order to understand the pathogenesis of this inflammatory condition.


We have collected tonsil tissue from 2 groups of pediatric patients undergoing tonsillectomy: PFAPA patients (n=20) and patients who had indication of recurrent bacterial tonsillitis (control group, CG) (n=16). We have performed staining of subpopulations on tonsil cells and tissues using, respectively, flow cytometry and immunohisto-chemistry assays. We have analyzed TLRs, NLRs, and RLRs gene expression profiles by quantitative real-time RT-PCR.


Immunohistochemistry analysis has shown preservation of tonsillar architecture without any specific chronic

Yaboratory of Immunology and Rheumatic Diseases, U.O. Pediatria II, G. Gaslini Institute, Genoa, Italy

Full list of author information is available at the end of the article

inflammation with respect to GC. FACS analysis has demonstrated a higher number of naïve and a significantly lower percentage of effector memory CD4+ and CD8+ T cells in PFAPA patients compared to CG. Remarkably, we have observed a considerably recruitment of NK cells in tonsils of PFAPA patients with respect to CG. In particular, we have detected a significant expansion of CD56 +CD16- and CD56+CD16+ NK cell subsets when compared to CG. A detailed characterization of NK activating receptors and NK cell functions in PFAPA tonsils is still in progress. Finally, in PFAPA patients we have revealed a significant increase in the gene expression of NALP1 and NALP3 when compared to CG.


These results indicate a possible involvement of NK cells and of innate receptors in pathogenesis of PFAPA supporting the crucial role of the innate immunity. Nonetheless, the high numbers of undifferentiated naïve T cells in PFAPA patients suggest that adaptive immune responses might be implicated in these autoinflammatory disorders. Tonsillectomy seems to be an effective treatment for PFAPA syndrome.

Disclosure of interest

None declared.

Authors' details

laboratory of Immunology and Rheumatic Diseases, U.O. Pediatria II, G. Gaslini Institute, Genoa, Italy. 2Laboratory of Molecular Genetics, G. Gaslini Institute, Genoa, Italy. 3Anatomic Pathology, G. Gaslini Institute, Genoa, Italy. 4Medicina Sperimentale, University of Genoa, Genoa, Italy. 5U.O. Otorinolaringoiatria, G. Gaslini Institute, Genoa, Italy.

Published: 8 November 2013

© 2013 Chiesa et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons CGntfäl Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Chiesa et al. Pediatric Rheumatology 2013, 11 (Suppl 1):A94

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Cite this article as: Chiesa et al.: 0R5-001 - Characterization of tonsil infiltration in PFAPA. Pediatric Rheumatology 2013 11 (Suppl 1)A94.

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