Peripheral mechanisms underlying electroacupuncture analgesia in a rat model of c

电针镇痛大鼠模型的外周机制

• 批准号: 7789782
• 负责人: Guang-Yin Xu
• 金额: $ 19.13万
• 依托单位: UNIVERSITY OF TEXAS MED BR GALVESTON
• 依托单位国家: 美国
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-12-01 至 2011-11-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7789782
• 关键词: Abdominal Pain; Absence of pain sensation; Absenteeism; Acetic Acids; Acupuncture procedure; Acute; Adult; Afferent Neurons; Analgesics; Attenuated; Birth; Chronic; Clinical; Colon; Colorectal; Consultations; Cystathionine; Data; Disease; Electroacupuncture; Enzymes; Experimental Models; Figs - dietary; Future; Gastrointestinal Diseases; Gene Expression; Genus Cola; Habits; Healthcare; Hydrogen Sulfide; Hyperalgesia; Hypersensitivity; Impairment; Inflammatory; Injection of therapeutic agent; Intestines; Irritable Bowel Syndrome; Knowledge; Lead; Marketing; Mediating; Medical; Modality; Modeling; Molecular; Neonatal; Neurons; Nociceptors; Opiates; Opioid; Pain; Pathway interactions; Patients; Peripheral; Pharmaceutical Preparations; Physicians; Rattus; Recurrence; Role; Safety; Signal Pathway; Signal Transduction; Site; Spinal Ganglia; Staging; Symptoms; Syndrome; Testing; Treatment Effectiveness; Visceral; Visceral pain; Workplace; base; colorectal distension; desensitization; economic cost; nociceptive response; public health relevance; receptor; success

DESCRIPTION (provided by applicant): Irritable Bowel Syndrome (IBS) remains a common and challenging syndrome for clinicians. It is defined by recurrent symptoms of abdominal pain or discomfort associated with alterations in bowel habits, in the absence of a detectable structural or inflammatory change in the colon. The pain, discomfort, and impairment from IBS often lead to healthcare medical consultation and workplace absenteeism, and associated economic costs. The causes of IBS and effectiveness of treatment have remained elusive. Although opiates have remained to be the drugs of choice for treating patients with severe pain and a few receptor modulators are marketed for treatment of IBS in recent years, there has been concern about the safety of these drugs. Electroacupuncture (EA), a complementary modality, has been used extensively for treatment of various painful conditions and gastrointestinal diseases. The mechanisms of acupuncture are not well understood, however, and one of the major problems impeding this understanding is a lack of proper experimental models. Recently, we have developed a model of EA-induced analgesia in rats with chronic visceral hyperalgesia (CVH). The objective of this application is to evaluate the effect of EA visceral anti- hyperalgesia and its mechanism in a rat model of CVH. We hypothesize that EA reverses the enhanced excitability of colon specific primary sensory neurons which is at least in part mediated by inhibition of endogenous hydrogen sulfide signaling, thus alleviates CVH. To test this hypothesis, we propose the following specific aims: Specific Aim 1 is to evaluate the acute and short-term effects of EA on nociceptive responses to colorectal distention in rats with CVH; Specific Aim 2 is to determine ionic and molecular basis for EA-mediated desensitization of primary sensory neurons in rats with CVH; and Specific Aim 3 is to determine the role of H2S signaling pathway in EA-mediated analgesia in rats with CVH. We believe that our studies on cellular activity, gene expression, and enzymatic activity in peripheral sensory neurons may open new era towards ionic and molecular understanding of EA treatment in CVH. This added knowledge will provide physicians with an increased clinical acceptance of EA in patients with functional bowel diseases. PUBLIC HEALTH RELEVANCE: Chronic visceral hyperalgesia occurs frequently in patients with functional bowel diseases and has not been controlled adequately. Electroacupuncture has been used for millennia to treat pain. This study will evaluate the effects and mechanisms of electroacupuncture on such pain in a rat model of chronic visceral hypersensitivity and the success of the proposed study will greatly advance the management of chronic visceral pain.

描述（由申请人提供）：肠易激综合征（IBS）仍然是临床医生常见且具有挑战性的综合征。它的定义是在结肠没有可检测的结构或炎症变化的情况下，与排便习惯改变相关的腹痛或不适的复发症状。IBS的疼痛、不适和损伤通常导致医疗咨询和工作场所缺勤，以及相关的经济成本。IBS的病因和治疗效果仍然难以捉摸。尽管阿片类药物仍然是治疗剧烈疼痛患者的首选药物，并且近年来有一些受体调节剂上市用于治疗IBS，但人们对这些药物的安全性感到担忧。电针作为一种辅助疗法，已被广泛用于治疗各种疼痛和胃肠道疾病。然而，针灸的机制还没有得到很好的理解，阻碍这种理解的主要问题之一是缺乏适当的实验模型。最近，我们建立了一种慢性内脏痛觉过敏（CVH）大鼠电针镇痛模型。本研究旨在观察电针对CVH大鼠内脏痛觉过敏的影响及其机制。我们推测，EA逆转增强的结肠特异性初级感觉神经元的兴奋性，这至少部分是通过抑制内源性硫化氢信号传导介导的，从而抑制CVH。为了验证这一假设，我们提出了以下具体目标：具体目标1是评估EA对CVH大鼠结肠扩张伤害性反应的急性和短期影响：具体目标2是确定EA介导的CVH大鼠初级感觉神经元脱敏的离子和分子基础;具体目的3：探讨H2S信号通路在电针镇痛中的作用。我们相信，我们对外周感觉神经元的细胞活性，基因表达和酶活性的研究可能会打开一个新的时代，对离子和分子的理解电针治疗CVH。这一增加的知识将为医生提供增加的功能性肠病患者EA的临床接受度。 公共卫生相关性：慢性内脏痛觉过敏常发生在功能性肠病患者中，并且尚未得到充分控制。电针治疗疼痛已有数千年的历史。本研究将在慢性内脏高敏感性大鼠模型中评价电针对这种疼痛的影响和机制，并且所提出的研究的成功将大大推进慢性内脏疼痛的管理。