神经肽食欲素可作为治疗感染性休克的潜在药物

2017-02-13 佚名 生物探索

脓毒症是一种由于对感染过度的免疫反应而危及生命的疾病,会损害病人自己的组织和器官。感染性休克是脓毒症的严重阶段,血压下降到危险的低水平,往往导致多器官衰竭而死亡。迄今为止,还没有有效的治疗可用于感染性休克。日本科学家报道在elife上的最新发现可能是开发用于治疗感染性休克药物的突破。该研究小组由筑波大学国际综合睡眠医学研究所的Yasuhiro Ogawa、Yoko Irukayama Tomobe

脓毒症是一种由于对感染过度的免疫反应而危及生命的疾病,会损害病人自己的组织和器官。感染性休克是脓毒症的严重阶段,血压下降到危险的低水平,往往导致多器官衰竭而死亡。迄今为止,还没有有效的治疗可用于感染性休克。日本科学家报道在elife上的最新发现可能是开发用于治疗感染性休克药物的突破。

该研究小组由筑波大学国际综合睡眠医学研究所的Yasuhiro Ogawa、Yoko Irukayama Tomobe和Masashi Yanagisawa领导的研究小组发现:神经肽orexin(食欲素)的皮下注射能显着提高发生内毒素休克(脓毒症模型)小鼠的存活率。


食欲素orexin,由Yanagisawa和他的同事们在1998发现。这个小分子神经肽是一种下视丘所分泌的饥饿调控信号,因其强烈的促食欲作用而得名。近几年的研究表明orexin具有多种神经调节功能,不但影响机体摄食行为,还参与睡眠-觉醒周期的调节、血糖代谢、疼痛感知、心血管及自主神经系统和学习记忆的调节。

新的研究结果表明它可能是循环休克的治疗剂。然而orexin的临床应用在技术上很困难,因为其作用于大脑,而递送orexin到大脑的途径被血脑屏障所主动。血脑屏障是为了保护有害物质侵袭中枢神经系统,选择性输送必须的分子进入大脑和将大脑与循环系统分离开来的界面。

Irukayama-Tomobe说:“我们利用血脑屏障对全身炎症反应综合征的病理生理学特征导致的通透性,来将orexin递送到大脑。”研究表明:由于感染性休克引起的通透性的增强,静脉注射orexin能进入大脑的血脑屏障,从而有助于小鼠的生存和恢复体温,增加心脏跳动率,让其从感染性休克中复苏。他们进一步发现,orexin可能在脑内通过多种信号通路调节免疫反应。

本研究包括阐明orexin通过中枢神经系统调节免疫系统反应的确切机制。他们还证实了orexin通过外周血给药,在感染性休克的灵长类动物中的影响,研究目标旨在未来的临床应用。

原始出处


University of Tsukuba;Science Daily;Feb 9, 2017

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