Qiyang Shou1, Jiali Lang1, Lu Jin1, Mingsun Fang2, Beibei Cao3, Yueqin Cai2, Zhunan Ni4, Fengmei Qiu5, Changyu Li2, Gang Cao6, Huiying Fu7. 1. Second Clinical Medical College/Affiliated Secondary Hospital, Zhejiang Chinese Medical University, Hangzhou, China; School of Pharmacy, Zhejiang Chinese Medical University, Hangzhou, China. 2. Academy of Chinese Medicine, Zhejiang Chinese Medical University, Hangzhou, China. 3. Second Clinical Medical College/Affiliated Secondary Hospital, Zhejiang Chinese Medical University, Hangzhou, China. 4. Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou, China. 5. School of Pharmacy, Zhejiang Chinese Medical University, Hangzhou, China. 6. School of Pharmacy, Zhejiang Chinese Medical University, Hangzhou, China. Electronic address: caogang33@163.com. 7. Second Clinical Medical College/Affiliated Secondary Hospital, Zhejiang Chinese Medical University, Hangzhou, China. Electronic address: fhy131@126.com.
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE: Paeonia lactiflora Pall. (peony) is a medicinal plant used in the Xiaoqinglong decoction, a commonly prescribed traditional Chinese medicine for asthma. The main active ingredients of peony roots-described as the total glucosides of peony (TGP)-have anti-inflammatory, immunomodulatory, and protective effects on endothelial cells, and they are known to improve rheumatoid arthritis. This study explored the underlying mechanism of TGP activity in the treatment of allergic asthma. MATERIALS AND METHODS: Allergic asthma was induced in BALB/c mice by administering injections of ovalbumin (OVA) mixed with aluminum hydroxide gel and inhaling nebulized OVA. The OVA-sensitized mice were treated with TGP by oral gavage, and the potentially anti-asthmatic treatment effect was studied by testing airway hyperresponsiveness, classifying and counting of leukocytes, performing cytokine assays, and analyzing the lung histopathology. The β-hexosaminidase activity was assayed as a biomarker to evaluate the effect of TGP on mast cell degranulation. The mechanism of TGP was explored by monitoring the Ca2+ influx level in mast cells (RBL-2H3) using a Ca2+ fluorescent probe technique. RESULTS: In mice with OVA-induced allergic asthma, TGP reduced airway hyperresponsiveness and improved lung tissue pathology, which included a decrease in inflammatory cell infiltration and collagen deposition. TGP also significantly lowered BALF leukocyte, eosinophil, and neutrophil counts, along with chemokines and cytokines, such as eotaxin, TNF-α, IL-4, and MIP-1α, in serum and lungs of OVA-challenged mice. These effects were further confirmed with the decrease of β-hexosaminidase release and the inhibition of Ca2+ influx in mast cell degranulation. CONCLUSIONS: Our findings suggest that TGP improved OVA-induced allergic asthma in mice mainly by suppressing Ca2+ influx-dependent mast cell degranulation.
ETHNOPHARMACOLOGICAL RELEVANCE: Paeonia lactiflora Pall. (peony) is a medicinal plant used in the Xiaoqinglong decoction, a commonly prescribed traditional Chinese medicine for asthma. The main active ingredients of peony roots-described as the total glucosides of peony (TGP)-have anti-inflammatory, immunomodulatory, and protective effects on endothelial cells, and they are known to improve rheumatoid arthritis. This study explored the underlying mechanism of TGP activity in the treatment of allergic asthma. MATERIALS AND METHODS:Allergic asthma was induced in BALB/c mice by administering injections of ovalbumin (OVA) mixed with aluminum hydroxide gel and inhaling nebulized OVA. The OVA-sensitized mice were treated with TGP by oral gavage, and the potentially anti-asthmatic treatment effect was studied by testing airway hyperresponsiveness, classifying and counting of leukocytes, performing cytokine assays, and analyzing the lung histopathology. The β-hexosaminidase activity was assayed as a biomarker to evaluate the effect of TGP on mast cell degranulation. The mechanism of TGP was explored by monitoring the Ca2+ influx level in mast cells (RBL-2H3) using a Ca2+ fluorescent probe technique. RESULTS: In mice with OVA-induced allergic asthma, TGP reduced airway hyperresponsiveness and improved lung tissue pathology, which included a decrease in inflammatory cell infiltration and collagen deposition. TGP also significantly lowered BALF leukocyte, eosinophil, and neutrophil counts, along with chemokines and cytokines, such as eotaxin, TNF-α, IL-4, and MIP-1α, in serum and lungs of OVA-challenged mice. These effects were further confirmed with the decrease of β-hexosaminidase release and the inhibition of Ca2+ influx in mast cell degranulation. CONCLUSIONS: Our findings suggest that TGP improved OVA-induced allergic asthma in mice mainly by suppressing Ca2+ influx-dependent mast cell degranulation.
Authors: Wen Yan Huang; Sang Hoon Lee; Seong Ju Oh; Hyeock Yoon; Jeong Hoon Pan; Inhye Jeong; Mi Jeong Kim; Bok Kyung Han; Jae Kyeom Kim; Eui-Cheol Shin; Young Jun Kim Journal: Molecules Date: 2022-09-25 Impact factor: 4.927