Abstract
Periodic fever, aphthous stomatitis, pharyngitis, and cervical adenitis (PFAPA) syndrome is the most commonly encountered autoinflammatory disease in children, but its pathogenesis and diagnostic biomarkers are unknown. In this study, we examined the utility of CD64, a member of the Fcγ receptors, expressions on neutrophils and monocytes in diagnosing patients with PFAPA, along with other autoinflammatory diseases exhibiting periodic fever, and bacterial infections. Although CD64 was expressed at a similar level in the attack-free period of PFAPA and in controls, CD64 expressions on both neutrophils and monocytes were dramatically increased during attacks. Serum IFN-γ also increased in some PFAPA patients during flares, suggesting the involvement of T cell activation. Our findings demonstrate that remarkable CD64 expression during PFAPA flares serves as a potential biomarker for the diagnosis. We also suspect that IFN-γ, possibly from retention of activated T cells in peripheral tissues, increases CD64 synthesis in such cases.
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Abbreviations
- PFAPA:
-
Periodic fever, aphthous stomatitis, pharyngitis, and cervical adenitis
- IL:
-
Interleukin
- IFN-γ:
-
Interferon γ
- TNF-α:
-
Tumor necrosis factor alpha
- IP-10:
-
Interferon gamma-induced protein 10
- CXCL10/9:
-
C-X-C motif ligand 10/9
- MIG:
-
Monokine induced by gamma interferon
- G-CSF:
-
Granulocyte colony-stimulating factor
- Fcγ-Rs:
-
Fcγ receptors
- NK:
-
Natural killer
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Yamazaki, T., Hokibara, S., Shigemura, T. et al. Markedly elevated CD64 expressions on neutrophils and monocytes are useful for diagnosis of periodic fever, aphthous stomatitis, pharyngitis, and cervical adenitis (PFAPA) syndrome during flares. Clin Rheumatol 33, 677–683 (2014). https://doi.org/10.1007/s10067-014-2542-1
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DOI: https://doi.org/10.1007/s10067-014-2542-1