PROTEIN(S) INVOLVED IN NEUROTRANSMISSION

5-羟色胺（5-HT，血清素）及其受体已被 与人类精神疾病的病因学和治疗有关 萧条 5-HT受体的基本知识将有助于更好地 了解5-HT介导神经功能的分子机制， 将提供深入了解精神抑郁症的分子基础。 的 本项目的目标是研究结构和功能 人类5-HT-2的基因组结构和调控 受体。 这些目标将通过使用大鼠大脑来实现 最近克隆了5-HT-2受体cDNA。 建议的具体目标 研究概述如下。 1. 克隆人脑5-HT-2受体及其相关基因。 各种 分离5-HT-2受体亚型和相关cDNA克隆， 测序 药理学特征和第二信使系统 与表达的受体（磷酸肌醇（PI）周转，CA++ 释放或腺苷酸环化酶）进行表征。 2. 目的：定位5-HT-2受体基因的染色体位置。 这一目标 将通过体细胞作图和原位杂交完成， 染色体 3. 分离人基因组5-HT-2受体克隆。 4. 构建人5-HT-2受体的限制性酶切图谱并测定其序列 基因克隆 5. 鉴定和分析该基因的启动子区。 这一目标 将通过RNA酶保护、引物延伸和 氯霉素乙酰转移酶（CAT）报告基因测定。 顺- 元素，反作用因子和这些元素的功能将是 系统分析。 6a. 研究5-HT-2受体基因是否受蛋白激酶的调控 蛋白激酶C（PKC）和/或蛋白激酶A（PKA）。 TPA的影响（12-0- 十四烷酰基-佛波醇-14乙酸酯，PKC激活剂）对5-HT-2受体的作用 将通过使用CAT报告基因测定来研究基因表达， 足迹分析 1-（5-异喹啉磺酰基）-2-（4-羟基喹啉磺 将研究甲基哌嗪（H7）阻断TPA活化的方法。 类似 研究将使用PKA的激活剂如毛喉素和8- 溴二丁酰cAMP。 6b. 研究拮抗剂是否诱导5-HT-2受体下调 是在转录水平上。

5-hydroxytryptamine (5-HT, serotonin) and its receptors have been implicated in the etiology and therapeutic treatment of human mental depression. A basic knowledge of 5-HT receptors will help to better understand the molecular mechanism of 5-HT mediated neural function and will provide insights into the molecular basis of mental depression. The objectives of this project are to investigate the structure and function relationships, the genomic organization and the regulation of human 5-HT-2 receptor(s). These objectives will be accomplished by using the rat brain 5-HT-2 receptor cDNA cloned recently. The specific aims of the proposed study are outlined below. 1. To clone 5-HT-2 receptor and related cDNAs from human brain. Various 5-HT-2 receptor subtypes and related cDNA clones will be isolated and sequenced. The pharmacological profiles and the second messenger systems linked to the expressed receptors (phosphoinositol (PI) turnover, CA++ release, or adenylate cyclase) will be characterized. 2. To map the chromosomal location of the 5-HT-2 receptor gene. This aim will be accomplished by somatic cell mapping and in situ hybridization of the chromosome. 3. To isolate human genomic 5-HT-2 receptor clones. 4. To construct the restriction map and to sequence human 5-HT-2 receptor genomic clones. 5. To identify and to analyze promoter regions of this gene. This aim will be accomplished by RNase protection, primer extension, and chloramphenicol acetyltransferase (CAT) reporter gene assay. The cis- elements, trans-acting factors and the functions of these elements will be systematically analyzed. 6a. To investigate if 5-HT-2 receptor gene is regulated by protein kinase C (PKC) and/or protein kinase A (PKA). The effects of TPA (12-0- tetradecanoyl-phorbol-14 acetate, activator of PKC) on the 5-HT-2 receptor gene expression will be studied by using CAT report gene assay and footprinting analysis. The ability of 1-(5-isoquinolylsulfonyl)-2- methylpiperazine (H7) to block TPA activation will be studied. Similar studies will be performed using activators of PKA such as forskolin and 8- bromodibutyryl cAMP. 6b. To investigate if antagonist induced 5-HT-2 receptor down regulation is at the transcriptional level.