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Stemming the opioid-induced pain cascade via cannabinoid modulation

通过大麻素调节阻止阿片类药物引起的疼痛级联反应

基本信息

批准号：
10218325
负责人：
Steven G. Kinsey
金额：
$ 20.13万
依托单位：
UNIVERSITY OF CONNECTICUT STORRS
依托单位国家：
美国
项目类别：
财政年份：
2021
资助国家：
美国
起止时间：
2021-07-01 至 2023-06-30
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/10218325
关键词：
2-arachidonylglycerol Acute Analgesics Animal Model Animals Anti-Inflammatory Agents Antiinflammatory Effect Attention Attenuated Behavior Behavioral Behavioral Model Binding Biological CNR1 gene CNR2 gene Cannabinoids Cannabis Chemicals Chronic Data Depressed mood Development Disease Drug Targeting Drug abuse Endocannabinoids Enzymes Experimental Animal Model Female Genetic Glycerol Goals Gold Harvest Human Hyperalgesia Immunologics In Vitro Incubated Individual Inflammation Inflammatory Injury Literature MAGL inhibitor Measures Modeling Monoacylglycerol Lipases Morphine Morphine Users Motivation Mus Needlestick Injuries Neurons Opiate Addiction Opioid Pain Painless Pathway interactions Perception Peripheral Pharmaceutical Preparations Pharmacology Physiological Physiological Processes Postoperative Pain Postoperative Period Property Quality of life Relapse Reporting Research Risk Spinal Cord Splenocyte Stimulus Substance Use Disorder Surface Surgical incisions Surgical sutures TLR4 gene Testing Therapeutic Therapeutic Intervention Thermal Hyperalgesias Tissues Translational Research Treatment outcome Withdrawal Woman allodynia base cannabinoid receptor cannabinoid receptor antagonist combat conditioning cytokine dependence relapse desensitization drug relapse effective therapy endogenous cannabinoid system exogenous cannabinoid inflammatory pain macrophage male marijuana use mechanical allodynia monocyte morphine administration mu opioid receptors neurobehavioral novel strategies opioid abuse opioid epidemic opioid exposure opioid sparing opioid use opioid use disorder opioid user opioid withdrawal pain perception pain sensitivity painful neuropathy preclinical study prescription opioid prevent receptor relating to nervous system response sex side effect stem substance abuse treatment

项目摘要

Despite their abuse potential, opioids remain a gold standard analgesic. One of the lesser discussed effects of chronic opioid use is opioid induced hyperalgesia (OIH), or increased pain sensitivity in some users. OIH persists for a longer duration than opioid withdrawal and may contribute to drug seeking and relapse in people with substance use disorders. The physiological causes of OIH are caused by (1) repeated µ opioid activation and desensitization, and (2) activation of inflammatory pathways by morphine binding to Toll-like receptor 4. Cannabinoids have well established analgesic and anti-inflammatory properties. Endogenous cannabinoids (i.e., endocannabinoids) have anti-inflammatory effects with limited intoxicating effects, as compared with exogenous cannabinoids. The proposed study will use an experimental animal model of repeated morphine exposure, followed by paw incision injury. Our goal is to test the hypothesis that inhibition of the endocannabinoid catabolic enzyme monoacylglycerol lipase (MAGL) decreases pain and inflammation caused by repeated morphine treatment. Male and female mice will be repeatedly administered morphine or vehicle, in the presence of increased endocannabinoid tone, for four days. Endocannabinoid tone will be increased by either chemical inhibition of MAGL, or genetic deletion of MAGL globally or on neurons only. Then, a small incision will be made and sutured closed in the plantar surface of one hindpaw, to model postoperative hyperalgesia. Mice will be tested repeatedly for pain- induced, pain-suppressed, and pain conditioning behavioral models. Endocannabinoid receptor mechanism will be determined using selective CB1 and CB2 cannabinoid receptor antagonists. Paw tissue will be collected to quantify proinflammatory cytokine levels, and individual cytokine levels will be correlated with pain-related behaviors. The anti-inflammatory mechanisms of endocannabinoid modulation will be further probed in vitro, using isolated macrophages/monocytes. Extant studies of preclinical OIH models have used male animals almost exclusively. Because women may be at increased risk for developing OIH, we will include sufficient numbers of both female and male mice to investigate Sex as a Biological Variable. In addition to increasing basic understanding of the underlying neural and immunological mechanisms that contribute to opioid-induced hyperalgesia, our translational research goal is to develop treatments for substance abuse disorders.

尽管阿片类药物有滥用的可能性，但它们仍然是止痛药的黄金标准。其中一个较小的讨论的长期使用阿片类药物的影响是阿片类药物诱导的痛觉过敏（OIH），或增加疼痛一些用户的敏感性。OIH比阿片类药物戒断持续时间更长，导致药物使用障碍患者的药物寻求和复发。的 OIH的生理原因是由（1）重复的μ阿片样物质激活和脱敏，和（2）通过吗啡与Toll样受体4的结合激活炎症途径。大麻素具有良好的镇痛和抗炎特性。内源大麻素（即，内源性大麻素）具有抗炎作用，与外源性大麻素相比，拟议的研究将使用一个重复吗啡暴露的实验动物模型，随后是爪切口损伤。我们目的是检验内源性大麻素分解代谢酶的抑制单酰基甘油脂肪酶（MAGL）可减少由反复吗啡治疗雄性和雌性小鼠将重复施用吗啡或媒介物，在内源性大麻素浓度增加的情况下，持续四天。内源性大麻素的音调将是通过MAGL的化学抑制或MAGL的遗传缺失而增加，只有神经元。然后，在足底表面做一个小切口并缝合，一只后爪，以模拟术后痛觉过敏。老鼠会被反复测试疼痛- 诱导、疼痛抑制和疼痛条件反射行为模型。内源性大麻素受体将使用选择性CB 1和CB 2大麻素受体拮抗剂来确定机制。将收集爪组织以定量促炎细胞因子水平和单个细胞因子水平将与疼痛相关的行为相关。的抗炎机制将使用分离的内源性大麻素调节在体外进一步探索巨噬细胞/单核细胞。临床前OIH模型的现有研究使用雄性动物几乎完全。因为女性可能会增加患OIH的风险，我们将包括足够数量的雌性和雄性小鼠，以研究性别作为生物学指标，变量除了增加对潜在的神经和免疫机制，有助于阿片类药物诱导的痛觉过敏，我们的翻译研究目标是开发药物滥用障碍的治疗方法。