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Neuropeptides Exert Direct Effects on Rat Thymic Epithelial Cells in Culture

机译:神经肽对大鼠胸腺上皮细胞具有直接作用

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To determine if major thymic neuropeptides and neurotransmitters can directly influence the functional activity of cultured rat thymic epithelium, neuropeptides and neurotransmitters were applied, and intercellular communication, proliferation, and thymulin secretion assessed. After injections of a mixture of lucifer yellow dextran (too large to pass gap junctions) and cascade blue (which does) into single cells, some neuropeptides decrease dye coupling: 0.1 mM GABA (P< 0.0001), 100 nM NPY (P< 0.0001), 100 nM VIP (P< 0.001), 100 nM CGRP (P< 0.001), 100 nM SP (P< 0.01), and 0.1 mM histamine (P< 0.01), whereas 0.1 mM 5-HT, mM acetylcholine, and 1μM isoproterenol (β-adrenergic agonist) had no effect. Proliferation(incorporation of tritiated thymidine) was increased by CGRP (P= 0.004) and histamine (P< 0.02), but decreased by isoproterenol (P= 0.002), 5-HT (P= 0.003), and acetylcholine (P< 0.05). The percentage of multinucleate cells was decreased after isoproterenol (2.5%), and increased after 5-HT (21.3%), GABA (15%), and histamine (15.1%). Compared to controls, thymulin in the supernatant was decreased after challenge with acetylcholine (52%), isoproterenol (71%), 5-HT (73%), and histamine (84%). This study demonstrates direct effectsof neuropeptides and neurotransmitters on functional aspects of cultured thymic epithelial cells.
机译:为了确定主要的胸腺神经肽和神经递质是否可以直接影响培养的大鼠胸腺上皮的功能活性,应用了神经肽和神经递质,并评估了细胞间的通讯,增殖和胸腺素分泌。将荧光素黄右旋糖酐(过大而无法通过间隙连接)和级联蓝(确实如此)的混合物注射到单个细胞中后,一些神经肽会减少染料偶联:0.1 mM GABA(P <0.0001),100 nM NPY(P <0.0001) ),100 nM VIP(P <0.001),100 nM CGRP(P <0.001),100 nM SP(P <0.01)和0.1 mM组胺(P <0.01),而0.1 mM 5-HT,mM乙酰胆碱和1μM异丙肾上腺素(β-肾上腺素能激动剂)无效。 CGRP(P = 0.004)和组胺(P <0.02)增加了增殖(tri化胸苷的掺入),但异丙肾上腺素(P = 0.002),5-HT(P = 0.003)和乙酰胆碱(P <0.05)减少了增殖。异丙肾上腺素(2.5%)后多核细胞百分比降低,而5-HT(21.3%),GABA(15%)和组胺(15.1%)后多核细胞百分比增加。与对照组相比,用乙酰胆碱(52%),异丙肾上腺素(71%),5-HT(73%)和组胺(84%)攻击后,上清液中的胸腺素减少。这项研究证明了神经肽和神经递质对胸腺上皮细胞培养功能的直接影响。

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