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Wen C, Yu Z, Wang J, Deng Q, Deng J, Sun Z, Ye Q, Ye Z, Qin K, Peng X. Inhalation of Citrus Reticulata essential oil alleviates airway inflammation and emphysema in COPD rats through regulation of macrophages. JOURNAL OF ETHNOPHARMACOLOGY 2024; 320:117407. [PMID: 37981111 DOI: 10.1016/j.jep.2023.117407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2023] [Revised: 11/01/2023] [Accepted: 11/07/2023] [Indexed: 11/21/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Chronic obstructive pulmonary disease (COPD) is a chronic inflammatory respiratory disease. Citrus Reticulata peel, the dried ripe peel of Citrus Reticulata species, has been found to have anti-inflammatory and cough attenuation effects. However, the therapeutic effects and its precise underlying mechanisms of atomizing inhalation using Citrus Reticulata essential oil (CREO) have not yet been fully elucidated. AIM OF THE STUDY The aim of this study was to assess the therapeutic effects of Citrus Reticulata essential oil and its associated anti-inflammatory mechanisms in COPD rat model. METHODS A total of 80 SD rats were randomized into four groups: control group (Con), COPD model group (COPD), COPD + ipratropium bromide (IB), and COPD + citrus reticulata essential oil (CREO). To induce COPD in rats, cigarette smoke (CS) exposure was used, while CREO and IB groups were administered through atomizing inhalation. The clinical signs, pathological lesions of the lung, percentages of antigen-presenting lung macrophages (CD11b/c+/CD86+ cells) and CD8+ T cells, and the content and mRNA expression of cytokines of the lung were analyzed. RESULTS The findings revealed that atomizing inhalation of Citrus reticulata essential oil had therapeutic effects on COPD rats. The treatment resulted in improvement in the body weight and mental status of COPD rats, reduced pathological injury of the lung, and increased proportion of CD11b/c+/CD86+ cells in lung macrophages, while also decreasing the number of CD8+ T cells. In addition, the Citrus Reticulata essential oil reduced the contents of IL-18, IL-17A, IL-12p70, and GM-CSF, downregulated the relative mRNA expression of IFN-γ, IL-4, and MMP-12, and upregulated the mRNA expression of IL-10. CONCLUSIONS Citrus reticulata essential oil can alleviate histological injury of the lung and regulate macrophages and CD8+ T cells in COPD rats. The study suggests that citrus reticulata essential oil could be a potential therapeutic agent for COPD.
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Affiliation(s)
- Changlin Wen
- Sichuan Industrial Institute of Antibiotics, School of Pharmacy, Chengdu University, No. 2025, Chengluo Avenue, Chengdu, 610106, China
| | - Zhengqiang Yu
- Department of Technology, Sichuan Youngster Technology Co., Ltd, No. 733, Furong Avenue, Wenjiang District, Chengdu, 611130, China
| | - Juan Wang
- College of Culture and Education, Tianfu College of Swufe, Mianyang, 621000, China
| | - Qing Deng
- Department of Technology, Sichuan Youngster Technology Co., Ltd, No. 733, Furong Avenue, Wenjiang District, Chengdu, 611130, China
| | - Jiajia Deng
- Department of Technology, Sichuan Youngster Technology Co., Ltd, No. 733, Furong Avenue, Wenjiang District, Chengdu, 611130, China
| | - Zhenhua Sun
- Department of Technology, Sichuan Youngster Technology Co., Ltd, No. 733, Furong Avenue, Wenjiang District, Chengdu, 611130, China
| | - Qiaobo Ye
- School of Basic Medicine Sciences, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China.
| | - Zhen Ye
- School of Basic Medicine Sciences, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China
| | - Kaihua Qin
- School of Basic Medicine Sciences, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China
| | - Xi Peng
- Sichuan Industrial Institute of Antibiotics, School of Pharmacy, Chengdu University, No. 2025, Chengluo Avenue, Chengdu, 610106, China.
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