Involvement of cysteinyl leukotriene signaling in microglial morphological changes and CASP1 expression in vitro

Yu-xi WANG,Si-ran ZHANG,Xue XU,Cheng-tan LI,Wei ZHENG,Jian-bo ZHAO,Yan-fang WANG,Li-hui ZHANG

(1.Department of Pharmacology,Hangzhou Key Laboratory of Medical Neurobiology,School of Medicine,Hangzhou Normal University,Hangzhou 310036,China;2.Department of Neurology,Zhejiang Hospital,Hangzhou 310013,China)

T3-21

Involvement of cysteinyl leukotriene signaling in microglial morphological changes and CASP1 expression in vitro

Yu-xi WANG1,Si-ran ZHANG2,Xue XU1,Cheng-tan LI1,Wei ZHENG1,Jian-bo ZHAO1,Yan-fang WANG1,Li-hui ZHANG1

(1.Department of Pharmacology,Hangzhou Key Laboratory of Medical Neurobiology,School of Medicine,Hangzhou Normal University,Hangzhou 310036,China;2.Department of Neurology,Zhejiang Hospital,Hangzhou 310013,China)

OBJECTIVEWe have recently reported that cysteinyl leukotriene(CysLT)signaling plays an important role in microglial interleukin(IL)-1β secretion and subsequent neurotoxicity.The present study aimed to examine microglial morphological changes and the upstream molecular underlying IL-1β production in CysLT receptor agonist leukotriene D4(LTD4)-treated BV2 microglia in vitro.METHODSTwenty-four hours after murine microglial BV2 cells were stimulated with LTD4(1-100 nmol·L-1),the cell proliferation and morphology were observed.The expression level of cysteinyl aspartate-specific protease 1(CASP1)protein was measured by Western blotin BV2 cells.In addition,BV2 cells were pretreated with or without CysLT1 receptor antagonist montelukast for 1 h and the effects of montelukaston LTD4-stimulated microglial activation and CASP1 expression were evaluated.RESULTSThe number of BV2 cells had an increasing tendency after 24 h treatment with LTD4,but no significant differences were observed between the control and LTD4-treated cells(P＞0.05).Under basal and resting conditions,BV2 microglial cells displayed a ramified morphology.However,LTD4 at 100 nmool·L-1drove microglial morphological changes from a ramified towards an amoeboid shape.The expression of CASP1 protein was significantly upregulated in 100 nmool·L-1LTD4-treated BV2 microglia(P＜0.01).Furthermore,pretreatment with CysLT1 receptor antagonist montelukast prevented cell morphological changes and suppressed the increased CASP1 expression in LTD4-treated BV2 cells(P＜0.05).CONCLUSIONCysLT receptor agonist LTD4 induces morphological changes and CASP1 expressionin BV2 microglia,which can be inhibited by CysLT1 antagonist.These results suggest the involvement of CysLT signaling in microglial morphological changes and CASP1 expression.

cysteinyl leukotriene;receptor;microglia;inflammation

The project supported by National Natural Science Foundation of China(81671188);Zhejiang Provincial Natural Science Foundation of China(LY12H31010);and the Key Laboratory of Hangzhou City Project(20090233T12)

Li-hui ZHANG,Tel:13396713696,E-mail:lhzhang@hznu.edu.cn