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首页> 外文期刊>Neuroscience: An International Journal under the Editorial Direction of IBRO >Single cell laser dissection with molecular beacon polymerase chain reaction identifies 2A as the predominant serotonin receptor subtype in hypoglossal motoneurons.
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Single cell laser dissection with molecular beacon polymerase chain reaction identifies 2A as the predominant serotonin receptor subtype in hypoglossal motoneurons.

机译:具有分子信标聚合酶链反应的单细胞激光解剖将2A识别为舌下运动神经元中的主要血清素受体亚型。

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摘要

We hypothesize that sleep state-dependent withdrawal of serotonin (5-hydroxytryptamine, 5-HT) at upper airway (UAW) dilator motoneurons contributes significantly to sleep-related suppression of dilator muscle activity in obstructive sleep apnea. Identification of 5-HT receptor subtypes involved in postsynaptic facilitation of UAW motoneuron activity may provide pharmacotherapies for this prevalent disorder. We have adapted two assays to provide semi-quantitative measurements of mRNA copy numbers for 5-HT receptor subtypes in single UAW motoneurons. Specifically, soma of 111 hypoglossal (XII) motoneurons in 10 adult male rats were captured using a laser dissection microscope, and then used individually in single round molecular beacon polymerase chain reaction (PCR) for real-time quantitation of 5-HT(2A), 5-HT(2C), 5-HT(3), 5-HT(4), 5-HT(5A), 5-HT(5B), 5-HT(6) or 5-HT(7) receptor. Receptor mRNA copy numbers from single XII motoneurons were compared to control samples from within the XII nucleus and lateral medulla. All 20 motoneuronal soma assayed for the 5-HT(2A) receptor had measurable copy numbers (7028+/-2656 copies/cell). In contrast, copy numbers for the 5-HT(2A) receptor in XII non-motoneuronal (n=17) and lateral medulla (n=15) samples were 81+/-51 copies and 83+/-35 copies, respectively, P<0.05. Seven of 13 XII motoneurons assayed had measurable 5-HT(2C) receptor copy numbers of mRNA (287+/-112 copies/cell). XII soma had minimal 5-HT(3), 5-HT(4), 5-HT(5A), 5-HT(5B), 5-HT(6) or 5-HT(7) receptor mRNA. 5-HT(2A) receptor mRNA presence within XII motoneurons was confirmed with digoxigenin-labeled in situ hybridization.In summary, combined use of laser dissection and molecular beacon PCR revealed 5-HT(2A) receptor as the predominant 5-HT receptor mRNA in XII motoneurons, and identified small quantities of 5-HT(2C) receptor. This information will allow a more complete understanding of serotonergic control of respiratory activity.
机译:我们假设在上呼吸道(UAW)扩张器运动神经元中依赖于睡眠状态的5-羟色胺(5-羟色胺,5-HT)撤药对阻塞性睡眠呼吸暂停中与扩张器肌肉活动有关的睡眠抑制具有重要作用。突触后促进UAW运动神经元活性的5-HT受体亚型的鉴定可能为这种普遍的疾病提供药物治疗。我们调整了两种检测方法,以提供半定量检测单个UAW运动神经元中5-HT受体亚型mRNA拷贝数的方法。具体而言,使用激光解剖显微镜捕获10只成年雄性大鼠中111个舌下(XII)运动神经元的体细胞,然后将其单独用于单轮分子信标聚合酶链反应(PCR)中以实时定量5-HT(2A) ,5-HT(2C),5-HT(3),5-HT(4),5-HT(5A),5-HT(5B),5-HT(6)或5-HT(7)受体。将来自单个XII运动神经元的受体mRNA拷贝数与来自XII核和外侧延髓内的对照样品进行比较。分析了5-HT(2A)受体的所有20个泌尿生殖系统的体细胞均具有可测量的拷贝数(7028 +/- 2656拷贝/细胞)。相比之下,XII非运动神经元(n = 17)和外侧延髓(n = 15)样本中5-HT(2A)受体的拷贝数分别为81 +/- 51和83 +/- 35。 P <0.05。分析的13个XII运动神经元中有七个具有可测量的mRNA的5-HT(2C)受体拷贝数(287 +/- 112拷贝/细胞)。 XII体细胞具有最少的5-HT(3),5-HT(4),5-HT(5A),5-HT(5B),5-HT(6)或5-HT(7)受体mRNA。洋地黄毒苷标记的原位杂交证实XII运动神经元中存在5-HT(2A)受体mRNA。总之,激光解剖和分子信标PCR的结合使用显示5-HT(2A)受体是主要的5-HT受体mRNA。在XII运动神经元中,并鉴定出少量的5-HT(2C)受体。该信息将使您更全面地了解呼吸活动的血清素控制。

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