Olorinab(APD),aperipherallyacting,highlyselective,fullagonistofthecannabinoidreceptor2,reducescolitis-inducedacuteandchronicvisceralhypersensitivityinrodents.
Olorinab(APD)是一种大麻素受体2完全激动剂,其作用于周围神经,具有高选择性,可降低啮齿动物结肠炎引起的急慢性内脏超敏反应。
Abstract
Abdominalpainisakeysymptomofinflammatoryboweldisease(IBD)andirritablebowelsyndrome(IBS),forwhichthereareinadequatetherapeuticoptions.Wetestedwhetherolorinab-ahighlyselective,fullagonistofthecannabinoidreceptor2(CB2)-reducedvisceralhypersensitivityinmodelsofcolitisandchronicvisceralhypersensitivity(CVH).Inrodents,colitiswasinducedbyintrarectaladministrationofnitrobenzenesulfonicacidderivatives.Controlorcolitisanimalswereadministeredvehicleorolorinab(3or30mg/kg)twicedailybyoralgavagefor5days,starting1daybeforecolitisinduction.CVHmicewereadministeredolorinab(1,3,10,or30mg/kg)twicedailybyoralgavagefor5days,starting24daysaftercolitisinduction.Visceralmechanosensitivitywasassessedinvivobyquantifyingvisceromotorresponses(VMR)tocolorectaldistension(CRD).
腹部疼痛是IBD和IBS患者的主要临床表现,对于这些患者而言,得到的治疗不充分。我们在结肠炎和慢性内脏超敏反应(CVH)模型中测试了olorinab-一种高选择性的大麻素受体2(CB2)完全激动剂,以降低的内脏超敏反应。研究通过直肠内予硝基苯磺酸衍生物诱发生成啮齿动物结肠炎模型。从诱导结肠炎前1天开始,口服管饲法向对照或结肠炎动物模型组予赋形剂(溶解olorinab的溶剂)或olorinab(3或30mg/kg),日两次,共5天。从结肠炎诱发后的24天开始,通过口服管饲法予CVH小鼠olorinab(1、3、10或30mg/kg),日两次,持续5天。
Exvivoafferentrecordingsdeterminedcolonicnociceptorfiringevokedbymechanicalstimuli.ColitisandCVHanimalsdisplayedsignificantlyelevatedVMRstoCRDandcolonicnociceptorhypersensitivity.OlorinabtreatmentsignificantlyreducedVMRstocontrollevelsincolitisandCVHanimals.Additionally,olorinabreducednociceptorhypersensitivityincolitisandCVHstatesinaconcentration-andCB2-dependentmanner.Incontrast,olorinabdidnotalterVMRsnornociceptorresponsivenessincontrolanimals.CB2mRNAwasdetectedincolonictissue,particularlywithinepithelialcells,anddorsalrootganglia,withnosignificantdifferencesbetweenhealthy,colitis,andCVHstates.TheseresultsdemonstrateolorinabreducesvisceralhypersensitivityviaCB2agonisminanimalmodels,suggestingthatolorinabmayprovideanoveltherapyforIBD-andIBS-associatedabdominalpain.
通过量化大肠扩张(CRD)引起的内脏运动反应(VMR)来评估内脏的机械敏感性。离体传入记录确定了机械刺激引起的结肠伤害感受器放电情况。在结肠炎和CVH动物模型中,我们发出对CRD和结肠伤害感受器超敏反应的VMR明显升高。Olorinab治疗可显著降低VMR水平,以达到抑制动物模型的结肠炎和CVH表现。此外,olorinab通过浓度和CB2依赖性方式降低结肠炎和CVH状态下的伤害感受器超敏反应。相比之下,oborinab不会改变对照组动物的VMR或伤害感受器反应性。我们在结肠组织中,尤其是上皮细胞和背根神经节中检测到CB2mRNA,在健康,结肠炎和CVH状态之间没有显著差异。这些结果表明,在动物模型中,olorinab通过CB2激动作用降低了内脏超敏性,其表明olorinab可能为IBD和IBS相关的腹痛提供一种新的治疗方法。
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