Mechanism of action of formononetin in alleviating allergic asthma through DRP1-NLRP3 signaling pathway / 中国药理学通报

Aim To investigate the mechanism by which formononetin (FN) inhibits mitochondrial dynamic-related protein 1 (DRP1) -NLRP3 axis via intervening the generation of ROS to reduce allergic airway inflammation. Methods In order to establish allergic asthma mouse model, 50 BALB/c mice aged 8 weeks were divided into the control group, model group, FN treatment group and dexamethasone group after ovalbumin (OVA) induction. Airway inflammation and collagen deposition were detected by HampE and Masson staining. Th2 cytokines and superoxide dismutase (SOD), catalase (CAT), malondialdehyde (MDA), and IgE levels in bronchoalveolar lavage fluid (BALF) were measured by ELISA, ROS in BEAS-2B cells was assessed by DCFH-DA staining, DRP1 expression in lung tissue and BEAS-2B cells was detected by immunohistochemistry and immunofluorescence, and the DRP1-NLRP3 pathway was analyzed by immunoblotting. Results FN treatment could effectively ameliorate the symptoms of asthmatic mouse model, including reducing eosinophil accumulation, airway collagen deposition, decreasing Th2 cytokine and IgE levels, reducing ROS and MDA production, increasing SOD and CAT activities, and regulating DRP1-NLRP3 pathway-related protein expression, thereby relieving inflammation. Conclusion FN ameliorates airway inflammation in asthma by regulating DRP1-NLRP3 pathway.

JTE-013 mediates RhoA/ROCKl/Drpl signaling axis regulating mitochondrial damage and apoptosis to alleviate allergic rhinitis / 中国药理学通报

Aim To investigate the protective effect and mechanism of JTE-013 on allergic rhinitis (AR) by regulating mitochondrial injury and apoptosis through RhoA/ROCKl/Drpl pathway. Methods AR model was established by ovalbumin (OVA) in mice. Nasal tissue sections were then stained with HE, TUNEL and DHE. Western blot assay. In vitro, human nasal epithelial cells (HNEpCs) were stimulated with human recombinant interleukin-13 (IL-13), and the effects of JTE-013 and Y27632-related protein expression were detected by Western blot. Immunofluorescence was used to observe the effects of JTE-013 and Y 27632 on total ROS, mitochondrial membrane potential and mitochondrial ROS generation, Drpl translocation and Cyt-c expression in cells. Results JTE-013 reduced the frequency of nose rubbing and sneezing, reduced nasal mucosal thickening and decreased eosinophil infiltration in AR mice. TUNEL and DHE staining results suggested that JTE-013 could inhibit apoptosis and reduce ROS expression in mouse nasal epithelial cells. Western blot showed that both JTE-013 and Y 27632 could significantly reduce RhoA, ROCK1, Drpl and p-Drpl(616), inhibit the expression of apoptotic proteins Bax, cleaved-caspase-3, Cyt-c, cleavedcaspase-9 and up-regulate the expression of p-Drpl (637) and Bcl-2. Immunofluorescence showed that inhibitors of JTE-013 or ROCK1 almost blocked IL-13mediated increase in ROS and mtROS production, inhibited decrease in mitochondrial membrane potential, and blocked Cyt-c expression and Drpl translocation in nasal mucosal epithelial cells. Conclusion JTE-013 can regulate the morphology and function of mitochondria by inhibiting RhoA/ROCKl/Drpl signaling axis, thereby alleviating nasal epithelial cell inflammation in mice with allergic rhinitis.

Panax notoginseng saponin Rl attenuates allergic rhinitis through AMPK/DRP1 mediated mitochondrial fission / 中国药理学通报

Aim To investigate whether notoginsenoside Rl (PNS-R1) alleviates allergic rhinitis (AR) through AMP-activated protein kinase (AMPK)/mitochondrial fission critical protein (DRP1) -mediated mitochondrial fission. Methods Different doses of PNSRl were used to treat ovalbumin (OVA) -induced AR model mice,and the inhibitory effect of PNS-R1 on AR was investigated by observing allergic symptoms such as nasal rubbing and sneezing, as well as HE staining of nasal tissues. Serum IgE levels and nasal lavage fluid (NLF) inflammatory cytokine levels were detected by enzyme-linked immunosorbent assay (ELISA) and apoptosis-related proteins were detected by Western blot. In vitro human nasal epithelial cells (HNEpC) were stimulated with IL-13 to observe apoptosis, mitochondrial membrane potential, cellular ROS and mitochondrial ROS production, as well as the expression levels of AMPK/DRP1, expression levels of the TXNIP/NLRP3 inflammasomes and the translocation of DRP1. Results PNS-R1 attenuated allergic symptoms in AR mice, HE staining reduced inflammatory cells and reduced the levels of OVA-specific IgE in serum, and the levels of IL-4, IL-6, and IL-8 in NLF. PNS-R1 attenuated the apoptosis and ROS production of nasal epithelial cells in AR. In vitro PNS-R1 could up-regulate mitochondrial membrane potential after IL-13 stimulation, reduce ROS and mtROS production, the proportion of apoptotic positive cells, and reduce cleaved caspase-3, Bax, and up-regulate Bcl-2 expression, down-regulate DRP1 phosphorylation (Ser 616) and DRP1 translocation at the mitochondrial membrane in an AMPK-dependent manner, reducing TXNIP/NLRP3 expression. Conclusions PNS-R1 can protect mitochondrial integrity by inhibiting the AMPK/DRP1 signaling axis and its subsequent TXNIP/NLRP3 signaling axis,thereby alleviating rhinitis in AR mice.

Effects of traditional korean medicine Lurong Dabu Decoction on TLR4/WNT-5A signaling pathway in guinea pigs with cough variant asthma / 中国药理学通报

Aim To discuss the mechanism of Lurong Dabu Decoction on cough variant asthma. Methods Guinea pigs were divided into normal group(CON), model group(OVA), Lurong Dabu Decoction high-dose group(HIGH),low-dose group(LOW), and dexamethasone group(DEX)at random. The CVA model was established by smoking plus injection of OVA, aluminum hydroxide solution and nebulized inhalation to stimulate cough. Gguinea pigs were dissected 24 hours after the last challenge to obtain alveolar lavage fluid(BALF)and lung tissues. Immunoadsorption(ELISA)method was applied to detect the types of inflammatory cells and the content of inflammatory cytokines in BALF; HE and Masson staining of the middle lobe of the left lung were used to observe the pathological changes in lung tissues; immunohistochemical staining was used to observe TLR4 and WNT-5A protein expression and distribution of lung tissues; the protein extracted from the upper lobe of the left lung was used to measure the level of TLR4 and WNT-5A protein in lung tissues by Western blot; immunofluorescence was employed to measure the fluorescence intensity of TLR4 and WNT-5A in lung tissues; flow cytometry was used to detect IL-4 and IFN-γ in guinea pig lung tissues. Results Lurong Dabu Decoction could improve guinea pig airway inflammation, inhibit collagen fiber deposition, reduce the content of IL-4, IL-5, and IL-13 in BALF, and inhibit the protein expression of TLR4 and WNT-5A in lung tissues and increase IFN-γ levels in lung tissues while decreasing IL-4 levels. Conclusion Lurong Dabu Decoction may inhibit the occurrence of CVA through TLR4/WNT-5A signaling pathway.

Polydatin alleviates allergic rhinitis by regulating PINK1-Parkin-mediated mitophagy / 中国药理学通报

Objective To investigate the protective effect and mechanism of polydatin ( PD) on allergic rhinitis (AH) by regulating mitophagy through PINK1- Parkin signaling pathway, and to provide a new target for clinical treatment of AH.Methods Thirty-two BALB/c murine were randomly divided into 4 groups: control group, OVA group, PD low-dose (30 mg • kg 1 ) and high-dose ( 45 mg • kg 1 ) treatment groups.At the end of modeling, the total number of sneezing and nasal nibbing of murine was recorded.HE staining was used to observe the morphology of na- sal mucosal epithelium and eosinophil infiltration.Western blot was used to detect the expression of P1NK1 , Parkin, TOM20 and mitochondrial apoptosis- related proteins Bax, Bcl-2, caspase-3, cleaved- caspase-3 and Cytochrome C.Hie expression of P1NK1 and cleaved-caspase-3 in nasal epithelial cells (HNEpC) was observed by immunofluorescence.Re¬sults The frequency of sneezing and nasal rubbing movements was significantly increased, the nasal mu¬cosa epithelium was thickened, and eosinophils were accumulated in AH murine , these results were reversed after PD treatment.Western blot results shower] that signaling proteins PINK1/Parkin anrl pro-apoptotie pro¬teins, including Bax, caspase-3, cleaved-caspase-3 and Cytochrome C were significantly overexpressed, the expression of TOM20 and Bcl-2 was decreased in OVA group, and PD up-regulated the levels of P1NK1 , Parkin, as well as Bcl-2 and inhibited the expression of TDM20 and pro-apoptotic proteins, while after pre- treatment with mitochondrial division inhibitor 1 ( Mdi- vi-1 ) , the expression of P1NK1 and Parkin was re¬duced , the expression of TOM20 was increased, while PD treatment did not significantly affect this effect.From the immunofluorescence results, it can be seen that the level of P1NK1 was increased after IL-13 stim¬ulation of HNEpCs compared with the control group, and PD further up-regulated the expression of P1NK1 , which was suppressed after pretreatment with Mdivi-1 , while PD did not change this phenomenon.Western blot results for P1NK1 and cleaved-caspase-3 were con¬firmed by immunofluorescence.Conclusion PD may activate mitophagy through the P1NK1 -Parkin signaling pathway, thereby protecting against AR.

Glaucocalyxin A attenuates allergic responses by inhibiting mast cell degranulation through HMGB1/TLR4/NF-κB signaling pathways / 药学学报

The study is to investigate the effect of glaucocalyxin A (GLA) on mast cell-mediated anaphylaxis. The animal welfare and experimental process of this experiment followed the regulations of the Animal Ethics Committee of Yanbian University. BALB/c mice were used in the animal experiment and randomly divided into five groups, control group, model group, and GLA low, medium, and high dose groups (10, 20, and 40 mg·kg-1). Mice were sensitized by intradermal injection of anti-dinitrophenyl-immunoglobulin E (DNP-IgE) into the ears and challenged with a mixture of DNP-human serum albumin (HSA) and 4% evans blue into the tail veins to prepare an animal skin passive cutaneous anaphylaxis (PCA) model, which was collected from both ears for measurement of dye staining and histology. Rat peritoneal mast cells (RPMCs) were used in the cell experiment and divided into control, IgE + antigen (Ag), and IgE + Ag + GLA groups to determine histamine release as well as calcium influx levels. High-affinity IgE receptor (FcεRI)-mediated signaling pathway proteins and HMGB1/TLR4/NF-κB (high mobility group box 1/toll like receptor 4/nuclear transcription factor kappa B) signaling proteins were detected by Western blot. The results of animal experiments suggest that GLA inhibits PCA, reduces evans blue dye exudation, and reduces ear inflammation and ear thickness in mice. The results of cellular experiments suggested that GLA could reduce histamine release and calcium influx, and inhibit tumor necrosis factor-α (TNF-α), interleukin (IL)-4, IL-13, and IL-1β production; Western blot results showed that GLA inhibited FcεRI-mediated phosphorylation levels of spleen tyrosine kinase (Syk), Lck/Yes novel tyrosine kinase (Lyn), tyrosine kinase Fyn (Fyn), growth-factor receptor-bound protein 2 (Gab2), and phospholipase C (PLC) γ1, while GLA inhibited HMGB1/TLR4 signaling pathway to limit NF-κB p65 nuclear metastasis. The results indicate that GLA inhibits mast cell degranulation and attenuates allergic inflammation through the HMGB1/TLR4/NF-κB signaling pathway.

Arctigenin attenuates airway inflammation in asthmatic mice via SIRT1/NLRP3 pathway / 中国药理学通报

Aim To investigate the efficacy of arctigenin on airway inflammation in a mouse model of asthma and the mechanism related to the SIRT1/NLRP3 signaling pathway. Methods Forty female BALB/c mice of clean grade were selected and divided into control group, OVA model group and ATG group (5, 10 and 20 mg · kg

Astragalin inhibits airway inflammation in asthma through NOX2/ROS/NF-κB signaling pathway / 中国药理学通报

Aim To investigate the effect of astragalin (AG) on airway inflammation in asthmatic mice and its mechanism. Methods Fifty SPF male mice were randomly divided into normal group, asthma model group, and astragalin low (AG25), medium (AG50), and high (AG100) dose groups. A mouse model of asthma was prepared by egg albumin inhalation, the number of cells was counted by Diff-Quik staining after collecting bronchoalveolar lavage fluid (BALF), and IL4, 5, and 13 levels in BALF were measured by ELISA. The inflammatory changes in mouse lung tissues were observed using HE staining. Reactive oxygen species (ROS) levels were measured using a DCFH-DA probe, and superoxide dismutase (SOD) activity and malondialdehyde (MDA) content were measured by colorimetry. IL-4, IL-5, IL-13, NOX2, p47phox, p-NF-κBp65, NF-κBp65, IκBα, p-IκBα and β-actin expressions in lung tissues were detected by Western blot. Results AG significantly reduced the number of inflammatory cells and total cells in BALF, decreased IL-4, IL-5, and IL-13 contents in BALF and lung tissues, and reduced inflammatory cell infiltration in lung tissues. AG inhibited nicotinamide adenine dinucleotide phosphate oxidase 2 (NOX2) and p47phox expression, decreased ROS levels and MDA levels, increased SOD activity, and inhibited IκBα and NF-κBp65 phosphorylation. Conclusion AG attenuates airway inflammation in asthma by modulating the oxidative stress response through the NOX2/ROS/NF-κB signaling pathway.