A combination of alveolar type 2-specific p38α activation with a high-fat diet increases inflammatory markers in mouse lungs.

IF 4 2区 生物学 Q2 BIOCHEMISTRY & MOLECULAR BIOLOGY
C K Matthew Heng, Ilona Darlyuk-Saadon, Wupeng Liao, Manju P Mohanam, Phyllis X L Gan, Nechama Gilad, Christabel C M Y Chan, Inbar Plaschkes, W S Fred Wong, David Engelberg
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引用次数: 0

Abstract

Chronic respiratory diseases such as asthma and chronic obstructive pulmonary disease (COPD) afflict millions of individuals globally and are significant sources of disease mortality. While the molecular mechanisms underlying such diseases are unclear, environmental and social factors, such as cigarette smoke and obesity, increase the risk of disease development. Yet not all smokers or obese individuals will develop chronic respiratory diseases. The MAPK p38α is abnormally active in such maladies, but its contribution, if any, to disease aetiology is unknown. To assess whether p38α activation per se in the lung could impose disease symptoms, we generated a transgenic mouse model allowing controllable expression of an intrinsically active variant, p38αD176A+F327S, specifically in lung alveolar type 2 (AT2) pneumocytes. Sustained expression of p38αD176A+F327S did not appear to induce obvious pathological outcomes or to exacerbate inflammatory outcomes in mice challenged with common respiratory disease triggers. However, mice expressing p38αD176A+F327S in AT2 cells and fed with a high-fat diet (HFD) exhibited increased numbers of airway eosinophils and lymphocytes, upregulated levels of pro-inflammatory cytokines and chemokines including interleukin-1β and eotaxin, as well as a reduction in levels of leptin and adiponectin within the lung. Neither HFD nor p38αD176A+F327S alone induced such outcomes. Perhaps in obese individuals with associated respiratory diseases, elevated p38α activity which happens to occur is the factor that promotes their development.

肺泡2型特异性p38α激活与高脂肪饮食的结合增加了小鼠肺部的炎症标志物。
哮喘和慢性阻塞性肺病(COPD)等慢性呼吸系统疾病折磨着全球数百万人,是疾病死亡的重要来源。虽然这些疾病的分子机制尚不清楚,但环境和社会因素,如吸烟和肥胖,会增加疾病发展的风险。然而,并非所有吸烟者或肥胖者都会患上慢性呼吸道疾病。MAPK p38α在这些疾病中异常活跃,但其对疾病病因的贡献(如果有的话)尚不清楚。为了评估p38α在肺中的激活本身是否会导致疾病症状,我们建立了一个转基因小鼠模型,允许内在活性变体p38α d176a +F327S的可控表达,特别是在肺泡2型(AT2)肺细胞中。p38αD176A+F327S的持续表达似乎不会诱导明显的病理结果,也不会加剧常见呼吸道疾病触发因素引起的小鼠炎症结果。然而,在AT2细胞中表达p38αD176A+F327S并喂食高脂饮食(HFD)的小鼠表现出气道嗜酸性粒细胞和淋巴细胞数量增加,促炎细胞因子和趋化因子(包括白细胞介素-1β和eotaxin)水平上调,以及肺内瘦素和脂联素水平降低。单独使用HFD或p38αD176A+F327S均不能诱导上述结果。也许在患有相关呼吸系统疾病的肥胖个体中,p38α活性升高是促进其发展的因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Biological Chemistry
Journal of Biological Chemistry Biochemistry, Genetics and Molecular Biology-Biochemistry
自引率
4.20%
发文量
1233
期刊介绍: The Journal of Biological Chemistry welcomes high-quality science that seeks to elucidate the molecular and cellular basis of biological processes. Papers published in JBC can therefore fall under the umbrellas of not only biological chemistry, chemical biology, or biochemistry, but also allied disciplines such as biophysics, systems biology, RNA biology, immunology, microbiology, neurobiology, epigenetics, computational biology, ’omics, and many more. The outcome of our focus on papers that contribute novel and important mechanistic insights, rather than on a particular topic area, is that JBC is truly a melting pot for scientists across disciplines. In addition, JBC welcomes papers that describe methods that will help scientists push their biochemical inquiries forward and resources that will be of use to the research community.
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