摘要
Acetylcholine(ACh)regulates inflammation viaα7 nicotinic acetylcholine receptor(α7 nAChR).Acetylcholinesterase(AChE),an enzyme hydrolyzing ACh,is expressed in immune cells suggesting non-classical function in inflammatory responses.Here,the expression of PRiMA-linked G4 AChE was identified on the surface of macrophages.In lipopolysaccharide-induced inflammatory processes,AChE was upregulated by the binding of NF-κB onto the ACHE promotor.Conversely,the overexpression of G4 AChE inhibited ACh-suppressed cytokine release and cell migration,which was in contrast to that of applied AChE inhibitors.AChEmt,a DNA construct without enzymatic activity,was adopted to identify the protein role of AChE in immune system.Overexpression of G4 AChEmt induced cell migration and inhibited ACh-suppressed cell migration.The co-localization ofα7 nAChR and AChE was found in macrophases,suggesting the potential interaction ofα7 nAChR and AChE.Besides,immunoprecipitation showed a close association ofα7 nAChR and AChE protein in cell membrane.Hence,the novel function of AChE in macrophage by interacting withα7 nAChR was determined.Together with hydrolysis of ACh,AChE plays a direct role in the regulation of inflammatory response.As such,AChE could serve as a novel target to treat age-related diseases by antiinflammatory responses.
基金
supported by Shenzhen Science and Technology Committee Research Grant(JCYJ20170413173747440,ZDSYS 201707281432317,JCYJ20180306174903174,CKFW2016082916015476,China)
China Post-doctoral Science Foundation(2019M653087)
Zhongshan Municipal Bureau of Science and Technology(ZSST20SC03,China)
Guangzhou Science and Technology Committee Research Grant(GZSTI16SC02 and GZSTI17SC02,China)
Hong Kong RGC Theme-based Research Scheme(T13-607/12R,China)
Hong Kong Innovation Technology Fund(UIM/340,UIM/385,ITS/500/18FP,TCPD/17e9,PD18SC01 and HMRF18SC06,China)
作者简介
Corresponding author:Karl W.K.Tsim,Tel.:+85223587332,fax:+85223581552.E-mail address:botsim@ust.hk
