细菌微型诱导人类β-defensin-2通过其脂蛋白在人类肠道上皮细胞的诱导
Yoon Ju So1, Ok-Jin Park1, Yeongkag Kwon1
1Department of Oral Microbiology and Immunology, and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, 08826, Republic of Korea.
Probiotics and antimicrobial proteins
|February 20, 2024
概括
细菌细菌脂蛋白 (LPPs) 刺激人类肠道细胞产生人类β防御素-2 (HBD-2),一种抗微生物,可以防止肠道病原体.
科学领域:
- 微生物学 微生物学
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
背景情况:
- 人类肠上皮细胞 (IECs) 通过抗微生物 (AMPs) 维持肠道平衡.
- 细菌素,一种益生菌,提供肠道保护,但其活性成分是未知的.
- 识别B. subtilis的有益分子对于了解肠道健康至关重要.
研究的目的:
- 确定从B. subtilis中诱导人类IEC中的AMPs的关键分子.
- 阐明B. subtilis诱导的AMP产生背后的分子机制.
- 确定这些AMP在打击肠道病原体中的作用.
主要方法:
- 用B. subtilis及其组成部分对待Caco-2细胞和初级人类IECs.
- 量化了人类β防御素-2 (HBD-2) 的mRNA表达和蛋白质产生.
- 研究了收费类受体2 (TLR2) 和下游信号通路 (MAPK,NF-κB).
- 质谱测量确定了脂蛋白 (LPP) 候选物.
主要成果:
- 在IEC中,B. subtilis剂量和时间依赖,增加了HBD-2表达.
- B. subtilis脂蛋白 (LPP) 显著诱导HBD-2mRNA和蛋白质,与其他成分不同.
- 由LPP诱导的HBD-2分泌发生在顶端,通过TLR2-介导的MAPK/NF-κB通路.
- HBD-2 抑制了金黄色葡萄球菌和大麦芽菌的生长.
- LPP的脂质和蛋白质部分对于HBD-2诱导至关重要.
结论:
- B. subtilis脂蛋白是人类IECs中HBD-2分泌的关键诱导剂.
- 这种LPP-HBD-2轴增强了对肠道病原体的保护.
- B. subtilis LPPs,特别是ABC载体,有助于肠道平衡和病原体防御.
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