Protease-activated receptor 2 promotes clearance of Pseudomonas aeruginosa infection by inducing cAMP-Rac1 signaling in alveolar macrophages.

Protease-activated receptor 2 promotes clearance of Pseudomonas aeruginosa infection by inducing cAMP-Rac1 signaling in alveolar macrophages.
复制标题

蛋白水解酶激活受体2通过诱导肺泡巨噬细胞内cAMP-rac1信号通路促进铜绿假单胞菌感染的清除。

DOI:
10.3389/fphar.2022.874197
复制
发表时间:
2022
影响因子:
5.6
通讯作者:
Mehta, Dolly
Mehta, Dolly
中科院分区:
医学2区
文献类型:
--
作者:
Rayees, Sheikh;Joshi, Jagdish Chandra;Joshi, Bhagwati;Vellingiri, Vigneshwaran;Banerjee, Somenath;Mehta, Dolly

文献摘要

参考文献

相似文献

在感染性损伤期间,先天免疫系统对病原体的有效吞噬对于恢复组织完整性至关重要。吞噬作用受损,例如在感染铜绿假单胞菌(一种广谱抗生素耐药革兰氏阴性细菌)的情况下,可能会导致危及生命的肺部疾病,即急性肺损伤(ALI)。有证据表明,蛋白酶激活受体 2 (PAR2) 的缺失会损害铜绿假单胞菌的清除,导致不可缓解的 ALI,但其机制仍不清楚。在这里,我们重点关注肺泡巨噬细胞 (AM),这是参与感知细菌的肺驻留巨噬细胞的主要群体,以了解它们在 PAR2 介导的铜绿假单胞菌吞噬作用中的作用。我们发现,在与铜绿假单胞菌结合后,表达 PAR2 的 AM(而非 PAR2 无效的 AM)增加了 cAMP 水平,从而通过蛋白激酶 A 激活 Rac1。激活的 Rac1 增加了富含肌动蛋白的突起,从而增强了铜绿假单胞菌的吞噬作用。将含有组成型活性 Rac1 的脂质体注入 PAR2 缺失小鼠的肺部,可挽救吞噬作用并提高 PAR2 缺失小鼠肺炎的存活率。这些研究表明,PAR2 驱动 cAMP-Rac1 信号级联,激活 AM 中的铜绿假单胞菌吞噬作用,从而防止细菌性肺炎导致的死亡。
Efficient phagocytosis of pathogens by the innate immune system during infectious injury is vital for restoring tissue integrity. Impaired phagocytosis, such as in the case of infection with Pseudomonas aeruginosa, a broad-spectrum antibiotic-resistant Gram-negative bacterium, can lead to a life threatening lung disorder, acute lung injury (ALI). Evidence indicates that loss of protease-activated receptor 2 (PAR2) impaired Pseudomonas aeruginosa clearance leading to non-resolvable ALI, but the mechanism remains unclear. Here, we focused on the alveolar macrophages (AMs), the predominant population of lung-resident macrophages involved in sensing bacteria, to understand their role in PAR2-mediated phagocytosis of Pseudomonas aeruginosa. We found that upon binding Pseudomonas aeruginosa, PAR2-expressing but not PAR2-null AMs had increased cAMP levels, which activated Rac1 through protein kinase A. Activated Rac1 increased actin-rich protrusions to augment the phagocytosis of Pseudomonas aeruginosa. Administration of liposomes containing constitutively active Rac1 into PAR2-null mice lungs rescued phagocytosis and enhanced the survival of PAR2-null mice from pneumonia. These studies showed that PAR2 drives the cAMP-Rac1 signaling cascade that activates Pseudomonas aeruginosa phagocytosis in AMs, thereby preventing death from bacterial pneumonia.
DOI: 10.1186/1478-811x-8-31
发表时间: 2010-12-22
期刊: Cell communication and signaling : CCS
影响因子: --
作者:
Chaitanya GV;Steven AJ;Babu PP
通讯作者: Babu PP
DOI: 10.14814/phy2.12175
发表时间: 2014-10-01
影响因子: 2.5
作者:
Aslam M;Tanislav C;Troidl C;Schulz R;Hamm C;Gündüz D
通讯作者: Gündüz D
DOI: 10.1073/pnas.1215902110
发表时间: 2013-05-21
影响因子: 11.1
作者:
Bachmann, Verena A.;Riml, Anna;Stefan, Eduard
通讯作者: Stefan, Eduard
DOI: 10.1016/j.ccm.2004.10.014
发表时间: 2005-03-01
影响因子: 5.7
作者:
Dreyfuss, D;Ricard, JD
通讯作者: Ricard, JD
DOI: 10.1016/j.mvr.2009.11.007
发表时间: 2010-03-01
影响因子: 3.1
作者:
Birukova, Anna A.;Burdette, Dylan;Birukov, Konstantin G.
通讯作者: Birukov, Konstantin G.