Antiasthmatic effects of Gleditsia sinensis in an ovalbumin-induced murine model of asthma

This study evaluated the antiasthmatic effects of Gleditsia sinensis ethanolic extract (GSEE) and its underlying mechanisms, using an in vivo murine model of asthma. Female BALB/c mice were sensitized, challenged with ovalbumin, and then examined for asthmatic reactions. The results showed that GSEE exerted profound inhibitory effects on the accumulation of eosinophils in the airways and reduced the levels of interleukin (IL)-4 and IL-5 in bronchoalveolar lavage fluid (BALF) and immunoglobulin E (IgE) in BALF and plasma. Gleditsia sinensis ethanolic extract also suppressed the production of reactive oxygen species in BALF and inflammatory infiltration, in a dose-dependent manner, and it inhibited goblet-cell hyperplasia in lung tissue. Thus, GSEE shows antiasthmatic effects in a murine model of allergic asthma, which appeared to be mediated partially by the reduction of oxidative stress and airway inflammation. These results indicate that GSEE could be an effective novel therapeutic agent for the treatment of allergic asthma.     

Inhibitory effect of kefiran on ovalbumin-induced lung inflammation in a murine model of asthma

Kefiran is a major component of kefir which is a microbial symbiont mixture that produces jelly-like grains. This study aimed to evaluate the therapeutic availability of kefiran on the ovalbumin-induced asthma mouse model in which airway inflammation and airway hyper-responsiveness were found in the lung. BALB/c mice sensitized and challenged to ovalbumin were treated intra-gastrically with kefiran 1 hour before the ovalbumin challenge. Kefiran significantly suppressed ovalbumin-induced airway hyper-responsiveness (AHR) to inhaled methacholine. Administration of kefiran significantly inhibited the release of both eosinophils and other inflammatory cells into bronchoalveolar lavage (BAL) fluid and lung tissue which was measured by Diff-Quik. Interleukin-4 (IL-4) and interleukin-5 (IL-5) were also reduced to normal levels after administration of kefiran in BAL fluid. Histological studies demonstrate that kefiran substantially inhibited ovalbumin-induced eosinophilia in lung tissue by H&E staining and goblet cell hyperplasia in the airway by PAS staining. Taken above data, kefiran may be useful for the treatment of inflammation of lung tissue and airway hyper-responsiveness in a murine model and may have therapeutic potential for the treatment of allergic bronchial asthma. These two authors made equal contribution to this work.     

孟鲁司特对哮喘豚鼠气道嗜酸粒细胞炎症的抑制作用

目的　研究白三烯受体拮抗剂孟鲁司特 (mon telukast,MK )对哮喘豚鼠气道嗜酸性粒细胞 (Eosinophil,Eos)炎症的影响 ,探讨孟鲁司特拮抗哮喘气道炎症的可能机制。方法　以卵白蛋白致敏豚鼠制备哮喘模型。用密度梯度分离法分离并计数支气管肺泡灌洗液 (BALF)中不同密度的嗜酸性粒细胞 ;采用TUNEL技术原位检测嗜酸性粒细胞凋亡 ;通过ELISA法检测BALF中IL 5的含量 ;采用荧光酶标记法在PharmaciaUnicap 10 0System中测定BALF中嗜酸性粒细胞阳离子蛋白 (ECP)的水平。结果　孟鲁司特能降低哮喘豚鼠BALF中Eos的数量 ;在孟鲁司特治疗组 ,嗜酸性粒细胞凋亡指数明显升高 ,BALF中IL 5和ECP的含量降低 ,与模型组比较差异均有显著性。结论　降低气道IL 5和ECP的水平 ,促进嗜酸性粒细胞凋亡 ,减少嗜酸性粒细胞浸润 ,可能是白三烯受体拮抗剂孟鲁司特拮抗哮喘气道炎症的一个重要机制。     

雷帕霉素对哮喘小鼠气道重塑的影响

目的利用雷帕霉素探讨哺乳动物雷帕霉素靶蛋白(mTOR)在支气管哮喘小鼠气道重塑中的作用机制。方法30只♂清洁级BABL/c小鼠,随机数字表法分为3组,每组10只,分别为生理盐水对照组、卵蛋白(OVA)哮喘组、雷帕霉素治疗组。在末次激发24 h后所有小鼠取左肺组织行苏木精-伊红(HE)染色,PAS染色及mTOR免疫组织化学染色。分别用酶联免疫吸附法(ELISA)和Western blot检测支气管肺泡灌洗液(BALF)中IL-4、IL-5、IL-13含量以及右肺组织mTOR蛋白表达。应用小鼠肺功能仪检测气道阻力的变化。结果哮喘模型组小鼠与对照组相比较BALF中IL-4、IL-5、IL-13水平增高;肺组织mTOR蛋白表达水平明显高于对照组(P<0.01)。雷帕霉素治疗组与哮喘模型组相比较BALF中IL-4、IL-5、IL-13含量及肺组织mTOR表达水平均降低,差异具有显著性(P<0.05)。结论雷帕霉素可抑制哮喘小鼠气道重塑的发生,其机制有可能是通过阻断mTOR信号通路而实现的。     

Regulation of eosinophil migration and Th2 cell function by IL-5 and eotaxin

Asthma is characterized by elevated production of IgE, Th2 cytokines, chemokines, mucus hypersecretion, globlet cell metaplasia/hyperplasia, airway obstruction, eosinophilia and enhanced bronchial hyperresponsiveness. These hallmark features of asthma have all been linked to the effector functions of Th2 cytokines (e.g., interleukin-(IL)-4,5,9,10, and 13) in clinical and experimental investigations. This article will detail some of the pathogenic effects regulated by IL-13, IL-5 and the eotaxin subfamily of chemokines to regulate certain aspects of allergic disease. In particular, the potency of IL-13 in inducing enhanced bronchial responsiveness to spasmogenic stimuli and mucus hypersecretion suggests a key role of this molecule in the induction of airways obstruction. Recent studies also indicate that IL-5 and eotaxin, through eosinophils, may regulate Th2 cell function and IL-13 production from this lymphocyte. Therefore, IL-5 and IL-13 signaling systems are not necessarily mutually exclusive effector mechanisms, but may also be integrated through eosinophils to regulate certain aspects of allergic diseases. Blocking IL-13, or pathways that may promote IL-13-associated allergic lung responses (IL-5 and eotaxin) could provide an important strategy to improve the specificity of asthma therapy.     

翘芩清肺剂对哮喘大鼠Th1/Th2细胞因子失衡的影响

目的 观察翘芩清肺剂对哮喘模型大鼠Th1/Th2失衡的免疫调节作用及机制。方法 以10%卵蛋白（OVA）在实验第1天、第8天对大鼠进行腹腔注射。第15天后用1%OVA雾化吸入,每天1次,连续2周;同时,分别用生理盐水、地塞米松、氨茶碱及翘芩清肺剂干预致哮喘模型大鼠,每天1次,连续4周,观察各组大鼠哮喘潜伏期、喘息程度、肺组织、支气管病理学变化;测定肺泡灌洗液（BALF）中IL-4、IL-5、IFN-γ水平变化,并与阳性药地塞米松及氨茶碱组对照。结果 翘芩清肺剂能有效延长OVA致哮喘大鼠模型的潜伏期、减轻喘息程度、改善升高的IL-4水平,降低病鼠的IL-5、INF-γ水平及IL-4/IFN-γ的比值,结果均有显著差异（P〈0.05或P〈0.01）。病理组织学检查模型组大鼠支气管黏膜上皮细胞及杯状细胞增生,肺泡内有分泌物及炎性细胞浸润,管腔狭窄;各用药物组病理改变均显著减轻。结论 翘芩清肺剂可能通过调节哮喘时失衡的Th1/Th2水平,有效改善哮喘状态,减轻哮喘发作。     

CCR3 monoclonal antibody inhibits airway eosinophilic inflammation and mucus overproduction in a mouse model of asthma

AIM: To explore the effect of a rat anti-mouse CC-chemokine receptor-3 (CCR3) monoclonal antibody (CCR3 mAb) on airway eosinophilia and mucus overproduction in asthmatic mice. METHODS: An asthma model was sensitized and challenged by ovalbumin (OVA) in male C57BL/6 mice. Asthmatic mice were given dual administration (intraperitoneal injection and aerosol inhalation) of CCR3 mAb or nonspecific rat IgG (ns-IgG). The number of total and differential inflammatory cells in the bronchial alveolar lavage fluid (BALF) was counted. Eosinophils number, the goblet cell percentage (GCP) and airway mucus index (AMI) were measured in the lung tissues. Interleukin (IL)-5 levels in the BALF were examined. The expression of MUC5AC and the epidermal growth factor receptor (EGFR) mRNA in the lung tissues was detected by semi-quantitative RT-PCR. The results were compared among the groups. RESULTS: CCR3 mAb significantly suppressed the increased eosinophils in the BALF and lung tissues in OVA-challenged mice compared with ns-IgG-treated mice. IL-5 levels in the BALF in CCR3 mAb and ns-IgG administration mice exhibited no obvious changes relative to OVA-challenged asthmatic mice. CCR3 mAb reduced the increased GCP and AMI after OVA challenge and decreased the enhanced expression of MUC5AC and EGFR mRNA in lung tissues in asthmatic animals. CONCLUSION: CCR3 mAb can significantly inhibit airway eosinophilia and mucus overproduction in asthmatic mice. Blockage of CCR3 may represent a new strategy to asthma therapy.     

Inhibitory effects of Actinidia polygama extract and cyclosporine A on OVA-induced eosinophilia and bronchial hyperresponsiveness in a murine model of asthma

Actinidia polygama is one of the well known herb used in oriental medicine for treatment of anti-inflammatory and many allergic diseases. Anti-asthmatic effects of A. polygama in the development of OVA-induced eosinophilia and hyperresponsiveness in murine model of asthma have not been fully investigated in vivo. Cyclosporine A (CsA) has been shown to inhibit single allergen-induced allergic inflammation such as eosinophilic and lymphocytic infiltration and mRNA expression for interleukin (IL)-4 and IL-5. Asthma is a chronic inflammatory disease of the mucosa and is associated with excess production of Th2 cytokines and eosinophil influx in lung. To clarify the anti-inflammatory and anti-asthmatic effects of A. polygama and CsA, we examined the influence of A. polygama fructus extract (APF) and CsA on the development of pulmonary eosinophilic inflammation in murine model of asthma. Our results have shown that APF and CsA have profound inhibitory effects on the accumulation of eosinophills into airways, with the reduction of eosinophil and total lung leukocyte number by reducing IL-4, IL-5, IL-13 and IgE levels in the BALF. Moreover, APF decreased eosinophil CCR3 expression and CD11b expression in lung cells. These results indicate that APF has a deep inhibitory effect on airway inflammation and hyperresponsiveness in murine model of asthma and play a crucial role as an immunomodulator which possess anti-inflammatory and anti-asthmatic property by modulating the relationship between Th1/Th2 cytokine imbalance.     

Chrysin alleviates allergic inflammation and airway remodeling in a murine model of chronic asthma

Asthma is a chronic airway inflammatory disorder and progresses mainly due to airway remodeling. Chrysin, a natural flavonoid, has been reported to possess multiple biologic activities, including anti-inflammation, anti-oxidation and anti-proliferation. The present study aimed to investigate whether chrysin could relieve allergic airway inflammation and remodeling in a murine model of chronic asthma and the mechanism involved. The female BALB/c mice sensitized and challenged with ovalbumin (OVA) successfully developed airway hyperresponsiveness (AHR), inflammation and remodeling. The experimental data showed that chrysin could alleviate OVA-induced AHR. Chrysin could also reduce OVA-induced increases in the number of inflammatory cells, especially eosinophils, interleukin (IL) -4, and IL-13 in bronchoalveolar lavage fluid (BALF) and total IgE in serum. The decreased interferon-γ (IFN-γ) level in BALF was also upregulated by chrysin. In addition, inflammatory cell infiltration, goblet cell hyperplasia and the expression of α-smooth muscle actin (α-SMA) around bronchioles were suppressed by chrysin. Furthermore, the phosphorylation levels of Akt and extracellular signal-regulated kinase (ERK) could be decreased by chrysin, which are associated with airway smooth muscle cell (ASMC) proliferation. These results indicate the promising therapeutic effect of chrysin on chronic asthma, especially the progression of airway remodeling.     

Airway inflammation and remodeling of cigarette smoking exposure ovalbumin-induced asthma is alleviated by CpG oligodeoxynucleotides via affecting dendritic cell-mediated Th17 polarization

Cigarette smoking (CS) is common in asthma, aggravating inflammatory reactions. However, the current treatment strategies for asthma are still not effective enough, and novel therapeutic approaches are required for CS-induced asthmatic disorders. We here investigated the ability of CpG oligodeoxynucleotides (CpG-ODNs) to inhibit airway inflammation and remodeling in ovalbumin (OVA)-associated asthma in mice exposed to chronic CS, revealing potential mechanistic insights. Lung tissue specimens were histologically analyzed. Th1/Th2/Th17 associated cytokines in serum, bronchoalveolar lavage fluid (BALF), and lung specimens were quantitated by ELISA, qRT-PCR and immunoblot. Parameters of bone marrow-derived dendritic cells (BMDCs) functions were evaluated as well. The results showed that BALB/c mice after CS and OVA treatments developed an asthmatic phenotype with airway inflammation involving both eosinophils and neutrophils, goblet cell metaplasia, airway remodeling, and elevated OVA-specific serum IgE, serum IL-17A, and BALF Th17/Th2 associated cytokines. CpG-ODNs and budesonide were found to synergistically inhibit inflammatory cell recruitment in the lung, airway remodeling, IgE synthesis, and Th17/Th2 associated cytokines. Mechanistically, CpG-ODNs and budesonide acted synergistically on BMDCs via downregulation of TSLP receptor (TSLPR) and IL-23 production, and subsequently contributed to dampen Th17/Th2 polarization in CS-associated asthma. In conclusion, combined administration of CpG-ODNs and budesonide, in a synergistic manner, inhibits airway inflammation, and tissue remodeling mediated by BMDCs by regulating IL-23 secretion and blocking TSLP signaling, which subsequently contribute to alleviate Th17/Th2 imbalance in CS-associated asthma.     

p38蛋白激酶抑制剂SB203580对支气管哮喘小鼠气道炎症和Th2类细胞因子的影响

目的观察特异性p38蛋白激酶(p38 MAPK)抑制剂SB203580对哮喘小鼠气道炎症和Th2类细胞因子的影响。方法BALB/c小鼠30只随机分成3组,即正常对照组、哮喘模型组和SB203580干预组。通过原位分子杂交和酶联免疫吸附法(ELISA)检测肺组织IL-4、IL-5 mRNA和支气管肺泡灌洗液(BALF)中白细胞介素(IL-4、IL-5)含量的变化,并观察BALF中炎症细胞和肺组织病理学改变。结果哮喘模型组小鼠BALF中炎症细胞计数和IL-4、IL-5含量以及肺组织IL-4、IL-5mRNA的表达较正常对照组明显升高,差异具有显著性(P<0.01);SB203580干预组小鼠上述指标较哮喘模型组小鼠明显降低,差异亦具有显著性(P<0.01),肺组织病理学改变明显减轻。结论SB203580能降低气道炎症细胞的聚集和炎症介质的表达。抑制p38 MAPK的活性可能成为哮喘治疗的新途径。     

Anti-asthmatic effect of marine red alga (Laurencia undulata) polyphenolic extracts in a murine model of asthma

The aim of the present work is focused on protective effects of an edible red alga, Laurencia undulata ethanolic (EtOH) extracts (LU) containing a large amount of polyphenols against OVA-induced murine allergic airway reactions using in vivo histological and cytokine assay. Mice sensitized and challenged with ovalbumin (OVA) showed typical asthmatic reactions as follows: an increase in the number of eosinophil in bronchoalveolar lavage fluid; a marked influx of inflammatory cells into the lung around blood vessels and airways, and airway luminal narrowing; the development of airway hyperresponsiveness; the detection of TNF-α and Th2 cytokines, such as IL-4 and IL-5 in the bronchoalveolar lavage (BAL) fluid; and detection of allergen-specific IgE in the serum. The successive intraperitoneal administration of LU before the last airway OVA-challenge resulted in a significant inhibition of all asthmatic reactions. These results suggest that L. undulata polyphenolic extracts possess therapeutic potential for combating bronchial asthma associated with allergic diseases.     

截喘汤对哮喘模型小鼠外周血浆IL-5、TNF-α及Eotaxin的影响

目的:研究中药截喘汤对哮喘模型小鼠外周血浆白细胞介素-5(IL-5)、肿瘤坏死因子(TNF-α)及嗜酸细胞活化趋化因子(Eotaxin)的影响,探讨其治疗支气管哮喘的作用机制。方法:将84只小鼠随机均分为7组,即正常对照组、哮喘模型组、地塞米松组、联合用药组及中药低、中、高剂量组,通过中药血清药理学,体内观察不同剂量截喘汤对哮喘模型小鼠外周血IL-5、TNF-α及Eotaxin含量的影响。结果:截喘汤能通过抑制IL-5和TNF-α的合成而阴滞气道变应性炎症(AAI)产生、发展和持续的各个环节,抑制气道高反应性(BHR),并可通过抑制Eotaxin的表达而减少嗜酸性粒细胞(EOS)在肺部的聚集和活化,从而减轻气道EOS浸润性AAI及BHR。结论:截喘汤可为临床用药提供理论依据。     

Effect of MX-68 on airway inflammation and hyperresponsiveness in mice and guinea-pigs

MX-68 is a newly synthesized antifolate, which is a derivative of methotrexate (MTX). In this paper, the effect of MX-68 on allergic airway responses in mice and guinea-pigs was studied. In the first experiment, antigen-induced airway inflammation and airway hyperresponsiveness (AHR) to acetylcholine in mice were examined and compared with the effects of classical antifolate methotrexate and prednisolone. Mice were sensitized with ovalbumin as an antigen and challenged with ovalbumin inhalation three times. After the last inhalation, AHR and airway inflammation were observed. An increase in Th2 cytokines (IL-4 and IL-5) and a decrease in a Th1 cytokine (IFN-gamma) in the bronchoalveolar lavage fluid (BALF), as well as an elevation of the immunoglobulin level in serum, were observed in sensitized mice. Oral administration of MX-68 had no effect on changes of body weight, but prednisolone reduced body weight during the experiment. The antigen-induced AHR and increases in the number of eosinophils and lymphocytes in BALF were significantly inhibited by MX-68. MX-68 interfered with the elevation of IL-4 and IL-5 levels in BALF, but had no effect on the decrease in IFN-gamma. Moreover, MX-68 significantly inhibited the elevation of serum IgE and IgG levels. In the guinea-pig model for bronchial asthma, biphasic increases in airway resistance (immediate asthmatic response, IAR, and late asthmatic response, LAR), as well as accumulated inflammatory cells in BALF, were observed after repeated antigen challenge. These asthmatic responses and inflammatory signs were significantly decreased by administration of MX-68. These results suggest that MX-68 obviously has an anti-inflammatory effect in an animal model of asthma and would be useful clinically for the treatment of bronchial asthma.     

当归对阴虚哮喘小鼠气道杯状细胞及JAK1/STAT6信号通路的影响

目的 探讨当归对阴虚哮喘小鼠气道杯状细胞增生及JAK1/STAT6信号通路的影响。方法 采用卵清白蛋白与甲状腺复制阴虚哮喘动物模型,观测当归对阴虚哮喘小鼠肺通气功能、哮喘气道杯状细胞增生、肺组织中Muc5ac、IL-13、IL-4含量以及JAK1与STAT6表达水平的影响。结果 当归可明显缓解阴虚哮喘小鼠呼吸频率、潮气量及增强呼气间歇的异常变化,改善肺功能,降低肺指数及肺组织湿干重比值,抑制气道杯状细胞增生,降低肺组织中Muc5ac、IL-13及IL-4含量,抑制肺组织JAK1及STAT6蛋白的表达(P＜0.05, 0.01)。结论 当归具有明显缓解气道杯状细胞增生及Muc5ac高表达而平喘的作用,抑制JAK1/STAT6信号通路是其改善哮喘气道黏液分泌失衡的作用机制之一。     

柚皮素通过抑制NF-κB信号通路减轻哮喘大鼠气道炎症反应#br#

摘要：目的　探讨柚皮素对哮喘大鼠气道炎症反应的影响及其作用机制。方法　利用卵清蛋白（OVA）诱导建立哮喘大鼠模型,实验分为正常对照组、哮喘模型组、柚皮素100 mg/kg及柚皮素200 mg/kg组,实验结束后麻醉脱颈处死大鼠;Giemsa染色检测支气管肺泡灌洗液（BALF）中炎性细胞的数量及分类;HE染色观察肺组织病理学变化;酶联免疫吸附测定试验（ELISA）检测血清中核因子κB（NF-κB）的含量和BALF中辅助性T2（Th2）细胞因子的含量;免疫组化和实时定量PCR（qPCR）检测哮喘大鼠肺部NF-κB蛋白及mRNA的表达水平。脂多糖（LPS）诱导建立A549炎症细胞模型,柚皮素处理细胞后免疫荧光和Western blot检测A549细胞中NF-κB蛋白的表达水平。结果　柚皮素100 mg/kg和柚皮素200 mg/kg组均可减少单核细胞、中性粒细胞、嗜酸性粒细胞、淋巴细胞对哮喘大鼠肺部和支气管的浸润,并可改善哮喘大鼠肺泡的生理结构,减少支气管黏膜上皮脱落,促进支气管假复层及纤毛结构修复。柚皮素可降低肺部NF-κB p65、NF-κB p50蛋白和mRNA的表达（P＜0.05）,降低血清中NF-κB p65、NF-κB p50和BALF中Th2细胞因子白细胞介素（IL）-4、IL-5、IL-13的含量（P＜0.05）。在体外LPS诱导的炎症A549细胞中,柚皮素可降低NF-κB p65、NF-κB p50蛋白的表达,上调IκBα的表达（P＜0.05）。结论　柚皮素可有效减轻哮喘大鼠肺部和支气管的炎症反应,其潜在的作用机制可能与抑制NF-κB信号通路有关。     

Progress in allergy signal research on mast cells: the role of histamine in goblet cell hyperplasia in allergic airway inflammation - a study using the Hdc knockout mouse

Although histamine is a central mediator in the immediate allergic reaction, its role in goblet cell hyperplasia in the airway of asthma is not completely understood. This study was designed to examine the role of histamine in goblet cell hyperplasia using histamine-deficient mice (Hdc(-/-) mice) with allergic airway inflammation. Wild-type and Hdc(-/-) C57BL/6 mice were sensitized with ovalbumin (OVA). After two-week exposure to OVA, goblet cell hyperplasia was evaluated. Cell differentials in BALF were analyzed. The mRNAs level of MUC5AC and Gob-5 gene were quantitatively determined. The number of eosinophils in BALF increased in both the wild-type mice and Hdc(-/-) mice; however, their ratio in Hdc(-/-) mice was significantly lower than that in the wild-type mice. The mRNA levels of Gob-5 and MUC5AC and the ratio of the goblet cells in the airway epithelium were significantly increased in Hdc(-/-) mice exposed to OVA compared to the wild-type mice under the same condition. These results suggested that histamine may play a regulatory role in goblet cell hyperplasia in allergic airway inflammation.     

Inhibitory effects of kaempferol-3-O-rhamnoside on ovalbumin-induced lung inflammation in a mouse model of allergic asthma

The modification of natural flavonoid by glycosylation alters their physicochemical and pharmacokinetic properties, such as increased water solubility and stability, reduced toxicity, and sometimes enhanced or even new pharmacological activities. Kaempferol (KF), a plant flavonoid, and its glycosylated derivative, kaempferol-3-O-rhamnoside (K-3-rh), were evaluated and compared for their anti-inflammatory, anti-oxidant, and anti-asthmatic effects in an asthma model mouse. The results showed that K-3-rh fully maintained its anti-inflammatory and anti-asthmatic effects compared with KF in an asthma model mouse. Both KF and K-3-rh significantly reduced the elevated inflammatory cell numbers in the bronchoalveolar lavage fluid (BALF). KF and K-3-rh also significantly inhibited the increase in Th2 cytokines (IL-4, IL-5, and IL-13) and TNF-α protein levels through inhibition of the phosphorylation Akt and effectively suppressed eosinophilia in a mouse model of allergic asthma. The total immunoglobulin (Ig) E levels in the serum and BALF were also blocked by KF and K-3-rh to similar extents. K-3-rh exerts similar or even slightly higher inhibitory effects on Th2 cytokines and IgE production compared with KF, whereas K-3-rh was less effective at DPPH radical scavenging and the inhibition of ROS generation in inflammatory cells compared with KF. These results suggested that the K-3-rh, as well as KF, may also be a promising candidate for the development of health beneficial foods or therapeutic agents that can prevent or treat allergic asthma.     

阿奇霉素对哮喘致敏大鼠气道炎症及Th1/Th2失衡的调节作用

目的:探讨阿奇霉素对哮喘(OVA)致敏大鼠气道炎症及Th1/Th2失衡的调节作用。方法:SD大鼠40只,随机分为生理盐水组、哮喘模型组、地塞米松组以及阿奇霉素组,每组10只。利用卵白蛋白(Ovalbumin,OVA)/Al(OH)3致敏与OVA雾化吸入激发建立大鼠过敏性气道炎症模型,收集肺泡灌洗液(BALF)进行白细胞分类计数。采用ELISA法测定肺泡灌洗液中IL-2、IL-4、TNF-α与ET-1的表达情况。光镜观察肺组织病理结构变化。结果:OVA模型大鼠肺泡灌洗液中的中性粒细胞、淋巴细胞以及嗜酸性粒细胞含量明显增加;HE染色观察肺组织病理结构出现明显的支气管上皮脱落、杯状细胞增生,支气管周围嗜酸性粒细胞明显浸润现象;BALF中IL-2、IL-4、TNF-α与ET-1的表达均明显高于生理盐水对照组(P<0.05)。阿奇霉素则显著降低肺泡灌洗液中中性粒细胞、淋巴细胞以及嗜酸性粒细胞含量;明显改善支气管上皮脱落、杯状细胞增生,支气管周围嗜酸性粒细胞浸润现象;BALF中IL-2、IL-4、TNF-α与ET-1的表达也明显低于OVA模型大鼠(P<0.05)。结论:阿奇霉素通过调节Th1/Th2失衡对过敏性哮喘的气道炎症具有明显的治疗作用。