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Imayoshi, M. et al.

Expression of CD180, a toll-like receptor homologue, is up-regulated in children with Kawasaki disease.

Kawasaki disease (KD) is an acute febrile illness in childhood characterized by the formation of aneurysms in coronary arteries. It is believed that KD is caused by infectious agents because of its epidemic waves and high incidence of familial occurrence. Because an increase in the levels and dysfunction of B cells in peripheral blood was reported in KD, we investigated the expression of cluster of differentiation 180 (CD180), a toll-like receptor homologue, in the B cells of children with KD, and in those with bacterial or viral infections. The percentages of CD180 positive B cells were significantly higher in children with KD or viral infections than in those with bacterial infections or in healthy controls. When the expression levels of CD180 were compared by using the mean fluorescent intensity ratio of patients to healthy controls, the level of CD180 expression was also significantly up-regulated in children with KD or viral infections. To clarify the effect of viral infection on the expression of CD180, B cells were stimulated with poly inosinic-cytidyric acid [poly(IC)], a synthetic double-stranded RNA. Poly(IC) clearly enhanced CD180 expression in B cells in vitro, both at the protein and messenger RNA levels. These results suggest that similar mechanisms may be involved in the up-regulation of B cell CD180 expression in patients with either KD or viral infections.[1]

References

Expression of CD180, a toll-like receptor homologue, is up-regulated in children with Kawasaki disease. Imayoshi, M., Yamamoto, S., Watanabe, M., Nishimura, S., Tashiro, K., Zaitsu, M., Tasaki, H., Kimoto, M., Hamasaki, Y., Ishii, E. J. Mol. Med. (2006) [Pubmed]

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