MECHANISMS OF STRESS SPECIFIC CHANGES IN GENE EXPRESSION

描述 对压力的早期反应包括激活肾上腺素能神经元， 蓝斑、交感神经元和肾上腺髓质 系统，从而产生中央和外围 儿茶酚胺去甲肾上腺素和肾上腺素。压力也会提高基因 表达为儿茶酚胺生物合成酶，并且有基因-， 组织和应激源特异性的差异，这些反应的压力。 该提案研究了基因表达的调节机制 儿茶酚胺生物合成酶（TH，DBH和PNMT）在体内的 肾上腺髓质、交感神经节和不同脑区 急性、反复或长期暴露于各种压力源。具体 目的是：（1）确定不同胁迫对TH、胸径、 PNMT基因表达，（2）确定单次或重复 TH，DBH和PNMT表达的胁迫诱导效应 转录因子c-fos，（3）表征差异表达的基础 交感神经节TH和DBH基因表达的调控比较 肾上腺髓质，（4）确定以前的慢性或重复的影响 在对新的应激源的反应中暴露于应激源，以及（5） 确定TH和DBH基因表达是否在大脑其他区域可检测到 比主要的儿茶酚胺能细胞领域，如果在这些表达 区域受到压力源的调节。

DESCRIPTION Early responses to stress include activation of noradrenergic neurons of the locus coeruleus, and the sympathetic neuronal and adrenomedullary systems, resulting in production of the central and peripheral catecholamines norepinephrine and epinephrine. Stress also elevates gene expression for catecholamine biosynthetic enzymes, and there are gene-, tissue-, and stressor-specific differences in these responses to stress. The proposal investigates the mechanisms of regulation of gene expression of catecholamine biosynthetic enzymes (TH, DBH, and PNMT) in vivo in the adrenal medulla, sympathetic ganglia, and in different brain areas of rats exposed acutely, repeatedly or chronically to various stressors. Specific aims are: (1) determine effects of different stressors on TH, DBH, and PNMT gene expression, (2) determine dependence of single or repeated stress-elicited effects of TH, DBH, and PNMT expression on the transcription factor c-fos, (3) characterize the basis for differential regulation of TH and DBH gene expression in sympathetic ganglia compared to adrenal medulla, (4) determine effects of prior chronic or repeated exposure to stressors in the response to a novel stressor and (5) determine if TH and DBH gene expression is detectable in brain areas other than the major catecholaminergic cell fields, and if expression in these areas is regulated by stressors.