Mechanisms of Heat Activation and Multimodal Functions of VR1 Receptor Channels

VR1受体通道的热激活机制和多模态功能

基本信息

批准号：
8073878
负责人：
FENG QIN
金额：
$ 7.5万
依托单位：
STATE UNIVERSITY OF NEW YORK AT BUFFALO
依托单位国家：
美国
项目类别：
财政年份：
2010
资助国家：
美国
起止时间：
2010-06-30 至 2011-05-31
项目状态：
已结题

项目摘要

DESCRIPTION (provided by applicant): Pain begins with transduction at peripheral nerve terminals of specialized sensory neurons called nociceptors. Understanding how these nociceptors respond to pain-producing stimuli is a key step towards understanding the biology of pain. This research concerns ion channels underlying nociception, in particular, the cloned vanilloid receptor TRPV1. Recent studies of the channel have shown a previously unsuspected level of complexity in its function and regulation and have implicated it in detection and integration of both exogenous noxious stimuli such as heat, vanilloids and acids and endogenous proinflammatory signals. The goal of the project is to determine, at the molecular level, how the receptor functions as a versatile noxious detector and integrator in response to various stimuli, using methods of single-channel electrophysiology combined with molecular biology. The first aim will focus on the mechanisms of the polymodal activation of the channel. Experiments are proposed to determine whether the heat sensitivity is required by other stimuli to activate the channel and how the stimuli of different modality interact within the receptor. The work will also develop allosteric models that unify the polymodal gating of the channel. The second objective is to investigate the structural basis of the polymodal activation. The study will examine to what extent the gating machinery for different stimuli are separated and will delineate the molecular domains specific to each stimulus and determine their functional mechanisms. The third aim concerns the desensitization and recovery of the channel. Experiments are proposed to quantify and establish the mechanisms of the depletion of phosphatidylinositol-45-bisphosphate (PIP2) caused by activation of TRPV1, and to elucidate the nature of the desensitized states. The proposed research will improve our knowledge of nociceptive sensory transduction and will benefit clinical advances in pain therapy, in particular, the search for analgesic drugs that have an entirely new mode of action and an unprecedented selectivity for nociceptors.

描述（由申请人提供）：疼痛始于在称为伤害感受器的专门感觉神经元外周神经末端的转导开始。了解这些伤害感受器如何应对产生疼痛的刺激是理解疼痛生物学的关键步骤。这项研究涉及伤害感受的离子通道，特别是克隆的香草素受体TRPV1。该通道的最新研究表明，其功能和调节中先前未提及的复杂性水平，并将其牵涉到外源性有害刺激（例如热，香草素和酸以及内源性促进信号）的检测和整合。该项目的目的是在分子水平上使用单通道电生理学的方法与分子生物学结合使用，从而在分子水平上确定受体如何作为多功能有害检测器和积分器的作用。第一个目标将集中于通道的多峰激活的机制。提出了实验，以确定其他刺激是否需要热敏感性激活通道以及不同模态在受体中如何相互作用的刺激。这项工作还将开发变构模型，以统一通道的多层门控。第二个目标是研究多型激活的结构基础。该研究将检查不同刺激的门控机械的分离，并将描绘每个刺激特定的分子域并确定其功能机制。第三个目标涉及通道的脱敏和恢复。提出了实验来量化和确定由TRPV1激活引起的磷脂酰肌醇-45-磷酸（PIP2）的耗竭的机制，并阐明脱敏状态的性质。拟议的研究将提高我们对伤害性感觉转导的了解，并有助于疼痛疗法的临床进展，特别是寻找具有全新的作用方式和对伤害感受器前所未有的选择性的镇痛药。