IF=43.474!Immunity|宋威團隊揭示癌癥惡液質的致病機理:腸道-腎臟免疫軸和尿酸代謝
日期:2023-04-03 09:20:46
以往利用不同的小鼠腫瘤模型,研究人員發現惡性腫瘤可通過分泌蛋白,如IL-6、TNF-a、Activin A、LIF等,促進宿主消耗(Baracos et al., 2018)。然而這些研究通常在無特定病原微生物(SPF)條件下完成,因此忽視了環境中微生物如細菌、真菌、病毒等以及宿主免疫反應的作用。
利用果蠅惡液質模型,研究人員鑒定了一系列腫瘤分泌蛋白,如ImpL2、Pvf1和Upd3等,分別通過insulin、MEK和Jak/Stat信號通路來遠程破壞宿主器官代謝平衡,造成宿主消耗(Ding et al., 2021; Kwon et al., 2015; Lodge et al., 2021; Song et al., 2019)。
2022年8月26日,武漢大學免疫與代謝前沿科學中心/中南醫院醫學研究院/泰康生命醫學中心的宋威課題組在《Immunity》雜志上發表題為"Renal NF-kB activation impairs uric acid homeostasis to promote tumor-associated mortality independent of wasting"的研究論文。
3SA(人體YAP1同源物),誘導腸道干細胞過度增殖形成腸道惡性腫瘤。在該研究中,研究人員首先發現yki3SA果蠅體內細菌增殖和系統IMD-NF-κB活化,延長荷瘤果蠅的壽命。遺傳學上回復腸道PGRP-SC2(在本研究中被鑒定為一種全新的具有廣譜抗菌功能的分泌型酰胺酶)表達也可以在不影響腸道腫瘤的前提下抑制細菌增殖和IMD-NF-κB活化、延長果蠅壽命。
3SA果蠅馬氏管中的IMD-NF-κB通路,而不是傳統認為的肌肉、脂肪和大腦組織,可以有效緩解yki3SA荷瘤果蠅的馬氏管中IMD-NF-κB活化可以造成尿酸堆積、促進機體死亡;喂食別嘌呤醇(Allopurinol)抑制尿酸合成或在馬氏管中特異阻斷IMD-NF-κB通路可有效緩解yki
總之,該研究發現環境微生物、腸道細菌、腎臟IMD-NF-κB免疫反應和尿酸代謝是惡性腫瘤導致機體死亡的重要因素,且獨立于目前已知的腫瘤相關的機體消耗,為深入理解腫瘤-宿主互作、實現荷瘤生存提供了新的角度。
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科研的每一小步成功都來源于團隊背后十二分的努力。
我們為用戶的成功感到由衷的喜悅!——小酷
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