JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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IL-10-producing B cells involved in the pathogenesis of Coxsackie virus B3-induced acute viral myocarditis.

BACKGROUND: Interleukin-10 (IL-10)-producing B cells, a subset of regulatory B cells, play critical roles in autoimmune and infectious diseases. However, the role of IL-10-producing B cells in acute viral myocarditis (AVMC) remains unknown.

METHODS: BALB/c mice were intraperitoneally (i. p.) infected with coxsackievirus B3 (CVB3) to establish AVMC models (AVMC group), while control mice (control group) were treated with phosphate-buffered saline (PBS) i. p. According to the time after injection, the AVMC group mice or control group mice were randomly separated into 1 week and 2 week subgroup. Myocardial histopathological changes were observed by hematoxylin and eosin staining and the frequency of splenic IL-10-producing B cells was measured by flow cytometry.

RESULTS: Histopathologic examination of heart tissues showed that mice infected with CVB3 developed AVMC. Compared with control group, the frequency of splenic IL-10-producing B cells was increased significantly in the AVMC group, with the 1 week AVMC subgroup (3.58 ± 0.47%) higher than the 2 week AVMC subgroup (2.50 ± 0.42%) (all P < 0.05).

CONCLUSIONS: IL-10-producing B cells are increased in CVB3-induced AVMC, indicating that IL-10-producing B cells may play an important role in the pathogenesis of CVB3-induced AVMC.

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