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Zeng J, Wan X, Liu T, Xiong Y, Xiang G, Peng Y, Zhu R, Zhou Y, Liu C. Chlorogenic acid ameliorates Klebsiella pneumoniae-induced pneumonia in immunosuppressed mice via inhibiting the activation of NLRP3 inflammasomes. Food Funct 2021; 12:9466-9475. [PMID: 34473137 DOI: 10.1039/d0fo03185b] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Chlorogenic acid (CGA) possesses a wide variety of bioactive properties, such as antioxidation, anti-inflammation and anti-bacteria. This study was aimed at exploring the effects of CGA of anti-inflammation and anti-bacteria on mouse pneumonia prepared by immunosuppressed mice infected with Klebsiella pneumoniae (K. pneumoniae) in vivo and the cellular inflammasomes through lipopolysaccharide (LPS) and adenosine triphosphate (ATP)-induced RAW 264.7 murine macrophages in vitro. Mice received CGA treatment (30 and 90 mg kg-1) for 8 consecutive days and on the fourth day immunosuppression in mice was induced by cyclophosphamide (40 mg kg-1) for 5 days before inoculation of K. pneumoniae. Immunosuppressed mice infected with K. pneumoniae developed severe pneumonia, with marked interstitial vascular congestion, widened alveolar intervals, infiltration of monocytes, lymphocytes and macrophages as well as the damage of epithelial architecture, with growing mortality and count forming unit (CFU). CGA treatment significantly decreased the ratio of lung/body weight, reduced the severity of pneumonia induced by K. pneumoniae, decreased the lung injury, inflammatory cell infiltration scores and CD68 protein expression, inhibited the expression of interleukin (IL)-6, IL-8, tumor necrosis factor (TNF)-α, and elevated the expression of IL-10. Meanwhile, we investigated the mechanism of CGA to counter K. pneumoniae-induced pneumonia and found that CGA remarkably repressed the activation of nucleotide-binding domain like receptor protein 3 (NLRP3) inflammasome. Altogether, our results indicate that the dietary intake of CGA or its rich foods ameliorates K. pneumonia-induced pneumonia by inhibiting the activation of NLRP3 inflammasomes.
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Affiliation(s)
- Junhao Zeng
- College of Medical Science, China Three Gorges University, Yichang, Hubei, 443000, China.,Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, Yichang, Hubei, 443000, China.
| | - Xiaoyu Wan
- College of Medical Science, China Three Gorges University, Yichang, Hubei, 443000, China.,Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, Yichang, Hubei, 443000, China.
| | - Ting Liu
- College of Medical Science, China Three Gorges University, Yichang, Hubei, 443000, China
| | - Ying Xiong
- College of Medical Science, China Three Gorges University, Yichang, Hubei, 443000, China
| | - Gan Xiang
- College of Medical Science, China Three Gorges University, Yichang, Hubei, 443000, China
| | - Yali Peng
- College of Medical Science, China Three Gorges University, Yichang, Hubei, 443000, China
| | - Ronghua Zhu
- College of Medical Science, China Three Gorges University, Yichang, Hubei, 443000, China
| | - Yongqin Zhou
- College of Medical Science, China Three Gorges University, Yichang, Hubei, 443000, China.,Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, Yichang, Hubei, 443000, China. .,The Institute of Infection and Inflammation, China Three Gorges University, Yichang, Hubei, 443000, China
| | - Chaoqi Liu
- College of Medical Science, China Three Gorges University, Yichang, Hubei, 443000, China.,Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, Yichang, Hubei, 443000, China.
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