Comparison of feeding suppression by the anorexigenic hormones neuromedin U and neuromedin S in rats.

Comparison of feeding suppression by the anorexigenic hormones neuromedin U and neuromedin S in rats.
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DOI:
10.1677/joe-10-0081
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发表时间:
2010-11
期刊:
The Journal of endocrinology
影响因子:
--
通讯作者:
K. Nakahara;T. Katayama;K. Maruyama;T. Ida;K. Mori;M. Miyazato;K. Kangawa;N. Murakami
K. Nakahara;T. Katayama;K. Maruyama;T. Ida;K. Mori;M. Miyazato;K. Kangawa;N. Murakami
中科院分区:
其他
文献类型:
--
作者:
K. Nakahara;T. Katayama;K. Maruyama;T. Ida;K. Mori;M. Miyazato;K. Kangawa;N. Murakami

文献摘要

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我们比较了大鼠中厌食激素神经调节素 U (NMU) 和神经调节素 S (NMS) 抑制摄食的中心机制。 I.c.v.注射 NMU 或 NMS 会剂量依赖性地减少黑暗期第一季度 3 小时的食物摄入量。涉及静脉注射的预处理注射特异性抗 NMS IgG 可阻断静脉注射和腹腔注射瘦素诱导的食物摄入抑制,但抗 NMU IgG 不会引起阻断。定量 PCR 分析表明 i.c.v.注射 NMU 或 NMS 分别引起室旁核 (PVN) 和弓状核 (Arc) 中 CRH 和阿片黑皮质素原 mRNA 表达的剂量依赖性增加。在 Arc 的组织培养物中,NMU 和 NMS 刺激 α-黑素细胞刺激激素的分泌,其中 NMS 的刺激更有效。 Arc 切片中响应 NMU 和 NMS 的神经元放电率增加的时程曲线显示出几乎相同的模式,在治疗后 10-15 分钟达到峰值,而 PVN 切片的时程曲线在 NMU 和 NMS 之间有所不同。这些结果表明,NMS 和 NMU 可能具有厌食作用,具体取决于生理条件。
We compared the central mechanisms of feeding suppression by the anorexigenic hormones neuromedin U (NMU) and neuromedin S (NMS) in rats. I.c.v. injection of either NMU or NMS dose dependently decreased 3-h food intake during the first quarter of a dark period. Pretreatment involving i.c.v. injection of a specific anti-NMS IgG blocked the suppression of food intake induced by i.c.v.- and i.p.-injected leptin, but anti-NMU IgG elicited no blockade. Quantitative PCR analysis revealed that i.c.v. injection of NMU or NMS caused a dose-dependent increase in CRH and proopiomelanocortin mRNA expression in the paraventricular nucleus (PVN) and arcuate nucleus (Arc) respectively. In tissue cultures of the Arc, secretion of α-melanocyte-stimulating hormone was stimulated by NMU and NMS, with more potent stimulation by NMS. The time-course curves of the increase in neuronal firing rate in Arc slices in response to NMU and NMS showed almost the same pattern, with a peak 10-15 min after treatment, whereas the time-course curves for the PVN slices differed between NMU and NMS. These results suggest that NMS and NMU may share anorexigenic effects, depending on physiological conditions.