Recombinant IL-22 promotes protection in a murine model of Aspergillus flavus keratitis and mediates host immune responses in human corneal epithelial cells

IF 2.6 2区 生物学 Q3 CELL BIOLOGY
Lakshmi Sruthi Mallela, Prerana Sharma, Tata Santosh RamaBhadra Rao, Sanhita Roy
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引用次数: 4

Abstract

Aspergillus flavus is a leading cause of corneal infections in India and worldwide, resulting in severe visual impairment. We studied the host immune response towards A. flavus in immortalised human corneal epithelial cells (HCEC) and found increased expression of Toll-like receptors, antimicrobial peptides and proinflammatory cytokines like IL-6 and IL-8. Differential expressions of antimicrobial peptides were determined in corneal scrapings from A. flavus keratitis patients with significantly increased expression of LL-37, S100A12 and RNase 7. Increased levels of IL-22 expression were observed both in patients with A. flavus keratitis and in experimental mice model of corneal infections along with IL-17, IL-23 and IL-18. IL-22 is an important mediator of inflammation during microbial infections, and acts primarily on fibroblasts and epithelial cells. We observed constitutive expression of IL-22 receptors in HCEC, and IL-22 mediated activation of NF-κB, MAPK pathways and STAT3, along with increased expression of antimicrobial peptides in these cells. IL-22 also efficiently lessened cell deaths in corneal epithelial cells during A. flavus infection in vitro. Furthermore, recombinant IL-22 reduced fungal burden and corneal opacity in an experimental murine model of A. flavus keratitis.

Abstract Image

重组IL-22促进小鼠黄曲霉角膜炎模型的保护,并介导人角膜上皮细胞的宿主免疫反应
黄曲霉是印度和世界范围内角膜感染的主要原因,导致严重的视力障碍。我们研究了永生化人角膜上皮细胞(HCEC)对黄芽孢杆菌的宿主免疫反应,发现toll样受体、抗菌肽和促炎细胞因子如IL-6和IL-8的表达增加。黄曲霉角膜炎患者角膜刮屑中抗菌肽的差异表达,LL-37、S100A12和RNase 7的表达显著增加。在黄曲霉性角膜炎患者和角膜感染实验小鼠模型中,IL-22和IL-17、IL-23、IL-18的表达水平均升高。IL-22是微生物感染过程中重要的炎症介质,主要作用于成纤维细胞和上皮细胞。我们观察到IL-22受体在HCEC中组成性表达,IL-22介导NF-κB、MAPK通路和STAT3的激活,同时这些细胞中抗菌肽的表达增加。IL-22还能有效地减少黄芽孢杆菌感染过程中角膜上皮细胞的死亡。此外,重组IL-22在实验性黄曲霉性角膜炎小鼠模型中减少了真菌负荷和角膜混浊。
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来源期刊
Cellular Microbiology
Cellular Microbiology 生物-微生物学
CiteScore
9.70
自引率
0.00%
发文量
26
审稿时长
3 months
期刊介绍: Cellular Microbiology aims to publish outstanding contributions to the understanding of interactions between microbes, prokaryotes and eukaryotes, and their host in the context of pathogenic or mutualistic relationships, including co-infections and microbiota. We welcome studies on single cells, animals and plants, and encourage the use of model hosts and organoid cultures. Submission on cell and molecular biological aspects of microbes, such as their intracellular organization or the establishment and maintenance of their architecture in relation to virulence and pathogenicity are also encouraged. Contributions must provide mechanistic insights supported by quantitative data obtained through imaging, cellular, biochemical, structural or genetic approaches.
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