A serpin that regulates immune melanization in the respiratory system of Drosophila.

A serpin that regulates immune melanization in the respiratory system of Drosophila.
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一种调节果蝇呼吸系统中免疫黑素化的SERPIN。

DOI:
10.1016/j.devcel.2008.08.017
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发表时间:
2008-10
期刊:
影响因子:
11.8
通讯作者:
Hashimoto, Carl
Hashimoto, Carl
中科院分区:
生物学1区
文献类型:
--
作者:
Tang, Huaping;Kambris, Zakaria;Lemaitre, Bruno;Hashimoto, Carl

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面对外部环境的上皮组织对于对抗微生物感染是必不可少的。除了提供物理屏障外,上皮组织还建立化学防御,以防止病原体入侵内部组织。在这里,我们描述了与宿主防御有关的黑化反应在果蝇的呼吸系统--气管中被激活。气管黑化可以通过微生物的存在而激活,但通常会被丝氨酸家族中的一种蛋白酶抑制剂Spn77BA阻止。Spn77BA抑制了涉及MP1和MP2蛋白酶的蛋白酶级联反应,该酶激活了黑色素生物合成中的关键酶-苯酚氧化酶。出乎意料的是,我们发现Spn77BA中断导致的气管黑化通过Toll途径诱导抗真菌多肽Drosmycin的系统性表达。局部和全身免疫反应之间的这种信号可能代表一种警报机制,为宿主做好准备,以防病原体突破上皮防御入侵内部组织。
Epithelial tissues facing the external environment are essential to combating microbial infection. In addition to providing a physical barrier, epithelial tissues mount chemical defenses to prevent invasion of internal tissues by pathogens. Here, we describe that the melanization reaction implicated in host defense is activated in the respiratory system, the trachea, of Drosophila. Tracheal melanization can be activated by the presence of microorganisms but is normally blocked by Spn77Ba, a protease inhibitor in the serpin family. Spn77Ba inhibits a protease cascade involving the MP1 and MP2 proteases that activates phenol oxidase, a key enzyme in melanin biosynthesis. Unexpectedly, we found that tracheal melanization resulting from Spn77Ba disruption induces systemic expression of the antifungal peptide Drosomycin via the Toll pathway. Such signaling between local and systemic immune responses could represent an alarm mechanism that prepares the host in case a pathogen breaches epithelial defenses to invade internal tissues.
DOI: 10.1126/science.285.5435.1917
发表时间: 1999-09-17
期刊: SCIENCE
影响因子: 56.9
作者:
Levashina, EA;Langley, E;Reichhart, JM
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