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Imiquimod-related dermatitis is mainly mediated by mast cell degranulation via Mas-related G-protein coupled receptor B2.

Abstract：

:While imiquimod (IMQ) has been widely used in dermatology, its side effect manifested as dermatitis couldn't be ignored. However, the underlying mechanism has not been fully understood. Considering the clinical features of IMQ-related dermatitis similar to pseudo-allergic reaction and the presence of large numbers of mast cell in tissues treated with IMQ, the possibility that IMQ-related dermatitis mediated by mast cell-specific Mas-related G protein-coupled receptor X2 (MRGPRX2) should be addressed. To investigate the role of MRGPRX2 in vivo, MrgprB2, the mice homology of human MRGPRX2, was detected in IMQ-induced dermatitis mouse model. Histopathological changes including mast cell degranulation and footpad swelling were assayed in wild-type and MrgprB2-/- mice. The results showed that IMQ application induced dermatitis and footpad swelling with inflammatory cells infiltration plus mast cell activation in the skin of wild-type mice but reduced significantly in MrgprB2-/- mice. Further, compared to wild-type mice, serum histamine and inflammatory cytokine levels were compromised in MrgprB2-/- mice treated with IMQ, while the serum IgE level didn't change significantly. In vitro studies, levels of mediators released from murine peritoneal mast cells (MPMCs) after IMQ treatment were increased in a dose-dependent manner, which were much mild in MPMCs from MrgprB2-/- mice. Intracellular Ca2+ concentration was increased in a dose dependent manner after IMQ treatment both in MrgprB2-HEK293 and MRGPRX2-HEK293 cells. Moreover, β-hexosaminidase released after IMQ treatment was blocked by siRNA directed at the MRGPRX2 receptor in LAD2 cells. In summary, MrgprB2 /MRGPRX2 mediate mast cell activation and participate in IMQ-related dermatitis.

journal_name

Int Immunopharmacol

journal_title

International immunopharmacology

authors

Hao Y,Peng B,Che D,Zheng Y,Kong S,Liu R,Shi J,Han H,Wang J,Cao J,Zhang Y,Gao J,He L,Geng S

doi

10.1016/j.intimp.2020.106258

subject

Has Abstract

pub_date

2020-04-01 00:00:00

pages

106258

eissn

1567-5769

issn

1878-1705

pii

S1567-5769(19)32219-2

journal_volume

81

pub_type

杂志文章

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