The effect of Fc?RIIA and Fc?RIIB on coronary artery lesion formation and intravenous immunoglobulin treatment responses in children with Kawasaki disease.
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ABSTRACT: Previous research has found patients with the Fc?RIIIB NA1 variant having increased risk of intravenous immunoglobulin (IVIG) resistance in Kawasaki disease (KD). Our previous studies revealed that elevated Fc?RIIA expression correlated with the susceptibility of KD patients. We conducted this research to determine whether and how Fc? receptors affect the susceptibility, IVIG treatment response, and coronary artery lesions (CAL) of KD patients. The activating Fc?RIIA and inhibitory Fc?RIIB methylation levels of seven patients with KD and four control subjects were examined using HumanMethylation27 BeadChip. We enrolled a total of 44 KD patients and 10 control subjects with fevers. We performed real-time RT-PCR to determine the Fc?RIIA and Fc?RIIB expression levels, as well as a luciferase assay of Fc?RIIA. We found a considerable increase in methylation of both Fc?RIIA and Fc?RIIB in KD patients undergoing IVIG treatment. Promoter methylation of Fc?RIIA inhibited reporter activity in K562 cells using luciferase assay. The Fc?RIIB mRNA expression levels were not found to increase susceptibility, CAL formation, or IVIG resistance. Fc?RIIA mRNA expression levels were significantly higher in IVIG-resistant patients than in those that responded to IVIG during the pre-treatment period. Furthermore, the Fc?RIIA/IIB mRNA expression ratio was considerably higher in KD patients with CAL than in those without CAL. Fc?RIIA and Fc?RIIB both demonstrated increased methylation levels in KD patients that underwent IVIG treatment. Fc?RIIA expression influenced the IVIG treatment response of KD patients. The Fc?RIIA/IIB mRNA expression ratio was greater in KD patients with CAL formation.
SUBMITTER: Chang LS
PROVIDER: S-EPMC5356778 | biostudies-other | 2017 Jan
REPOSITORIES: biostudies-other
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