Open Access Case report

Interleukin 12 receptor deficiency in a child with recurrent bronchopneumonia and very high IgE levels

Loredana Palamaro1, Giuliana Giardino1, Francesca Santamaria1, Rosa Romano1, Anna Fusco1, Silvia Montella1, Mariacarolina Salerno1, Matilde Valeria Ursini2 and Claudio Pignata13*

Author Affiliations

1 Department of Pediatrics, “Federico II” University, Naples, Italy

2 International Institute of Genetics and Biophysics, CNR, Naples, Italy

3 Unit of Immunology, Department of Pediatrics, “Federico II” University, Via S. Pansini 5-80131, Naples, 80127, Italy

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Italian Journal of Pediatrics 2012, 38:46  doi:10.1186/1824-7288-38-46

Published: 19 September 2012

Abstract

Interleukin-12 (IL-12) is involved in cellular immune responses against intracellular pathogens by promoting the generation of T naive in T helper 1 (Th1) cells and by increasing interferon-gamma (IFN-gamma) production from T and natural killer (NK) cells. A defective induction of a Th1 response may lead to a higher risk of infections, and, in particular, infections due to typical and atypical Mycobacteria. We report on the case of a girl with suffering from recurrent bronchopneumonia associated with very high serum IgE levels, who exhibited a profound impairment of the Th1 generation associated with a novel mutation in the exon 5 of the IL-12R β1 gene (R156H). Our data suggest that in children with severe and recurrent infections, even in the absence of a mycobacterial infection, functional and/or genetic alterations of the molecular mechanisms governing Th1/Th2 homeostasis might be responsible for an atypical immunodeficiency and, therefore, should be investigated in these patients.

Keywords:
Immunodeficiency; IL-12/IL-12 receptor; Recurrent pneumonia