Mechanisms and treatment of pain-depressed behavior
疼痛抑郁行为的机制和治疗
基本信息
- 批准号:10238775
- 负责人:
- 金额:$ 3.14万
- 依托单位:
- 依托单位国家:美国
- 项目类别:
- 财政年份:2020
- 资助国家:美国
- 起止时间:2020-08-25 至 2022-05-02
- 项目状态:已结题
- 来源:
- 关键词:2-arachidonylglycerol2-arachidonylglycerol signalingAbdomenAcidsAcuteAcute PainAcute inflammatory painAdultAffectiveAgonistAmericanAmphetaminesAnalgesicsAnatomyAntibodiesArachidonic AcidsAreaBackBehaviorBehavioralCNR1 geneCNR2 geneCannabinoidsChemicalsClinicClinicalComplementCyclooxygenase InhibitorsDepressed moodDevelopmentDiazepamDopamineEffectivenessEndocannabinoidsEnzymesEvaluationFaceFatty AcidsFeedbackFemaleFluorescent in Situ HybridizationGABA-A ReceptorGroomingHigh Pressure Liquid ChromatographyImmunohistochemistryInbred ICR MiceIntraperitoneal InjectionsKetoprofenLabelLactic acidLipidsMAGL inhibitorMediatingMental DepressionMonoacylglycerol LipasesMorphineMusNeural PathwaysNeuraxisNeuronsNeurotransmittersNociceptorsNucleus AccumbensOpioidOpioid agonistOxycodonePainPain MeasurementPain managementPathway interactionsPharmacologyPhenotypePhysiologicalProductionProstaglandinsProto-OncogenesPublic HealthReceptor ActivationReceptor SignalingReflex actionResearchRoleSensorySignal TransductionSiteSliceSomatosensory CortexSourceSpinalSpinal CordSpine painStimulusStretchingSynapsesTestingTetrahydrocannabinolThalamic structureTissuesTrainingTravelUnited StatesVentilatory DepressionVentral Tegmental AreaVisceralanandamidebehavioral responsecannabinoid receptorcareer developmentcentral painchronic painclinically relevantcomparativedorsal horndriving forceeffectiveness evaluationeffectiveness testingendocannabinoid signalingendogenous cannabinoid systemexperiencehealth care service utilizationimprovedinhibitor/antagonistintraperitoneallipidomicsliquid chromatography mass spectrometrymalemu opioid receptorsneural circuitneurochemistryneurotransmitter releasenon-opioid analgesicnoradrenaline transporternovelopioid epidemicpain behaviorpain inhibitionpain processingpain signalparabrachial nucleuspositive allosteric modulatorpre-clinicalpreclinical studypresynaptictransmission process
项目摘要
PROJECT SUMMARY
Pain management is a major public health problem in the United States. Opioids like morphine are widely used
to treat severe pain, but they possess limitations such as abuse liability and potentially lethal respiratory
depression that have fed into the current opioid public health crisis. The endocannabinoid system, which
includes cannabinoid receptors (CBRs), endogenous cannabinoid (eCB) lipid neurotransmitters, and enzymes
responsible for the synthesis and degradation of eCBs, has emerged as a promising source of targets for
development of candidate non-opioid analgesics. In particular, the enzyme monoacylglycerol lipase (MAGL)
breaks down the eCB agonist 2-arachidonoylglycerol (2-AG), and MAGL inhibition can increase 2-AG levels,
increase CBR activation, and potentially inhibit pain-related activity in neural pathways that mediate different
pain behaviors. This F31 application proposes research that will evaluate the effectiveness of the MAGL
inhibitor MJN110 to alleviate a battery of pain-related behavioral and neurochemical endpoints in adult male
and female mice following intraperitoneal administration of dilute lactic acid (IP acid) as an acute, visceral, and
physiologically relevant noxious stimulus. Aim 1 will determine MJN110 effectiveness to alleviate IP acid-
induced sensory and affective pain-related behaviors mediated by spinal and central pain-processing
pathways. The effects of MJN110 will be compared to clinically effective positive-control analgesics (the mu
opioid receptor agonist oxycodone and the cyclooxygenase inhibitor ketoprofen), non-analgesic negative
controls that nonspecifically depress or stimulate general behavior (the GABA-A receptor positive allosteric
modulator diazepam and dopamine/norepinephrine transporter inhibitor amphetamine), and the direct CBR
agonist ∆9-tetrahydrocannabinol (THC). Aim 2 will determine MJN110 effectiveness to inhibit IP acid-induced
activation of sensory and affective pain pathways. Neuronal activation will be assessed with
immunohistochemical and fluorescent in situ hybridization of the proto-oncogene cFos, and the chemical
phenotype of cFos-positive neurons will be determined using double-labeling with antibodies selective for
markers in glutamaterigic vs. GABAergic neurons. Aim 3 will use high-performance liquid chromatography-
mass spectrometry to determine MJN110 effectiveness to modulate pain-related changes lipidomic profiles of
fatty acids, oxilipins, and N-acylethanolimines in sensory and affective pain pathways. Overall, the proposed
research will provide a detailed evaluation of the antinocicpetive effectiveness of MJN110 for acute noxious
stimuli, as well as improve our understanding of the eCB system’s role in acute inflammatory pain signaling
and antinociception through comparative analyses of clinically-relevant pain-related behaviors and
neurochemical and lipidomic correlates.
项目概要
疼痛管理是美国的一个主要公共卫生问题,吗啡等阿片类药物被广泛使用。
治疗剧烈疼痛,但它们具有局限性,例如滥用可能性和潜在致命的呼吸道疾病
抑郁症已导致当前的阿片类药物公共卫生危机。
包括大麻素受体 (CBR)、内源性大麻素 (ECB)、脂质神经递质和酶
负责 eCB 的合成和降解,已成为有希望的靶标来源
候选非阿片类镇痛药的开发。特别是单酰甘油脂肪酶(MAGL)。
分解 eCB 激动剂 2-花生四烯酰甘油 (2-AG),MAGL 抑制可增加 2-AG 水平,
增加 CBR 激活,并可能抑制介导不同作用的神经通路中与疼痛相关的活动
该 F31 应用提出了评估 MAGL 有效性的研究。
抑制剂 MJN110 可缓解成年男性一系列与疼痛相关的行为和神经化学终点
和雌性小鼠腹膜内施用稀乳酸(IP酸)作为急性、内脏和
目标 1 将确定 MJN110 缓解 IP 酸的有效性。
由脊髓和中枢疼痛处理介导的诱发感觉和情感疼痛相关行为
MJN110 的效果将与临床有效的阳性对照镇痛药(mu)进行比较。
阿片受体激动剂羟考酮和环氧合酶抑制剂酮洛芬),非镇痛阴性
非特异性抑制或刺激一般行为的控制(GABA-A 受体正变构
调节剂地西泮和多巴胺/去甲肾上腺素转运蛋白抑制剂安非他明),以及直接 CBR
激动剂 Δ9-四氢大麻酚 (THC) 目标 2 将确定 MJN110 抑制 IP 酸诱导的有效性。
感觉和情感疼痛通路的激活将通过以下方式进行评估。
原癌基因 cFos 的免疫组织化学和荧光原位杂交,以及化学
cFos 阳性神经元的表型将通过双标记和选择性抗体来确定
谷氨酸能神经元与 GABA 能神经元的标记物。目标 3 将使用高效液相色谱法。
质谱法确定 MJN110 调节疼痛相关脂质组学变化的有效性
总体而言,提议的脂肪酸、氧脂平和 N-酰基乙醇胺在感觉和情感疼痛途径中的作用。
研究将对 MJN110 对急性毒性药物的镇痛效果进行详细评估
刺激,并提高我们对 eCB 系统在急性炎症疼痛信号传导中作用的理解
通过对临床相关疼痛相关行为的比较分析和预期
神经化学和脂质组学相关性。
项目成果
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