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AIM:To approach the relationship between the expression of intercellular adhesion (ICAM-1 mRNA) and acute lung injury (ALI) as well as the mechanisms of rhubarb in the prevention and treatment of the lung injury. METHODS:ALI animal model was performed by Lipopolysaccharide (LPS). The rats were divided into 4 groups: LPS group, control group, rhubarb+LPS group and dexamethasone+LPS group. Histopathological examination and biological markers were measured for the lung specimens. Molecular hybridization method was used to determine the expression of ICAM-1 mRNA. RESULTS:The ICAM-1 mRNA expression in the lung tissues of LPS group significantly increased compared with control group (P＜0.01), rhubarb and dexamethasone had the action of decreasing the ICAM-1 mRNA expression (P＜0.05, P＜0.01); pathologic changes and the biological markers of ALI significantly decreased or ameliorated. CONCLUSION:The increase in the expression of ICAM-1 mRNA in the lung tissues of ALI is involved in the formation of ALI. Rhubarb and dexamethasone can ameliorate the lung damage, mechanism of which may be related to the inhibition of ICAM-1 mRNA expression. 相似文献
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Avian influenza vaccines are commonly used in the poultry industry, and some medicinal plants can increase the efficacy of such vaccines. The objective of this study was to evaluate the effect of Immulant® (IMU) (a commercial product based on Echinacea and Nigella sativa) on stress induced by dexamethasone (DEX) in chickens vaccinated (VAC) against the H9N2 avian influenza virus (AIV-H9N2). Seven experimental groups were included: the negative control, VAC, DEX, VAC + DEX, VAC + DEX + IMU, VAC + IMU and IMU groups. The vaccinated chickens (at 10 days of age) were injected daily with DEX for three days pre-vaccination and for three days pre-challenge and orally administered 1% IMU for 6 weeks post-vaccination (PV). The chickens were then challenged intranasally with AIV-H9N2 at 28 days PV. Serum, blood, tracheal and cloacal swabs and tissue samples were collected in the 1st and 4th weeks PV and at different time points post-challenge. The results showed significant changes (P ≤ 0.05) in oxidative stress and antioxidant biomarkers (malondialdehyde, nitric oxide and reduced glutathione), haematological and immunological parameters, final live weights, relative organ weights and histopathological lesions between the VAC+DEX group and the VAC group. Moreover, IMU significantly increased protection rates post-challenge, HI antibody titers and heterophil phagocytic activity and decreased DEX-induced stress and virus shedding titers. In conclusion, oral administration of 1% IMU for six weeks can enhance the immune response after AI-H9N2 vaccination and reduce the pathogenicity of infection in stressed chickens. 相似文献
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AIM: To detect interleukin 15 (IL-15) levels in peripheral blood from patients with active lupus nephritis and investigate its clinical significance. METHODS: IL-15 level was determined by enzyme linked immunosorbent assay (ELISA). The peripheral blood mononuclear cells (PBMCs) were isolated with grads density abaxiality. The inhibitory effects of dexamethasone on production of IL-15, IgG and anti-dsDNA antibody in cultured PBMCs from LN patients were also investigated. RESULTS: (1) Serum IL-15 level in LN patients was significantly higher than that in normal controls (P<0.01). Serum IL-15 level in active LN patients was significantly higher than that in remised patients (P<0.05). (2) Serum IL-15 level was positively correlated with SLEDAI, anti-dsDNA antibody and 24 h urine protein excretion in active LN patients. (3) Serum IL-15 level was significantly reduced in LN patients treated with combination of cyclophosphamide (CTX) and steroid for 12 weeks. (4) Secretion of IL-15, IgG and dsDNA antibody in cultured PBMCs from active LN patients was significantly higher than that in normal control group, and IL-15 level in supernatant of cultured PBMCs from active LN patients was positively correlated with IgG and dsDNA antibody. Dexamethasone inhibited the secretion of IL-15, IgG and dsDNA antibody in cultured PBMCs from LN patients. CONCLUSION: Serum IL-15 level in patients with active lupus nephritis is significantly elevated, suggesting that IL-15 may be involved in the pathophysiological process of LN. IL-15 may be used as an index to assess the activity of LN. 相似文献
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对地塞米松预处理鸡投以１０－１００ｍｇ／ｋｇ剂量的西咪替丁,进行了后者对前者作用影响的观察。结果表明：地塞米松能抑制伴刀豆球蛋白Ａ（ｃｏｎＡ）引起的鸡外周血淋巴细胞（ＢＰＬ）之ＩＬ－２活性,而西咪替丁对这种抑制作用有显著的拮抗作用;地塞米松能抑制动物对绵工细胞（ＳＲＢＣ）和牛血清白蛋白（ＢＳＡ）等２种胸腺依赖性抗原和非胸腺依赖性抗原流产布鲁氏菌（ＢＡ）的抗体应答,但这种抑制作用会因西咪替丁逆转;西 相似文献
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鬼臼多糖对免疫功能低下小鼠体内自由基水平的影响 总被引：1，自引：0，他引：1
[目的]探讨鬼臼多糖对免疫抑制小鼠体内抗氧化水平的影响。[方法]应用鬼臼多糖或配合地塞米松（Dex）处理小鼠,测定小鼠胸腺和脾脏指数,胸腺匀浆中还原型谷胱甘肽（GSH）和一氧化氮（NO）含量,血浆中总抗氧化能力（T-AOC）、脂质过氧化（MDA）水平。[结果]结果表明,鬼臼多糖（200 mg/kg）能显著提高小鼠脾脏指数、胸腺匀浆中GSH水平和血浆中T-AOC,能降低正常小鼠血浆MDA水平及免疫抑制小鼠脾脏一氧化氮水平。[结论]鬼臼多糖能提高小鼠体内抗氧化和清除自由基的能力。 相似文献
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AIM: To elucidate the effects of platelet-activating factor (PAF) on eosinophil activation and the action of dexamethasone or theophylline during this process. METHODS: Eosinophils (EOS) from the peripheral blood of normal subjects were isolated. The hypodense eosinopil (HE) and normodense eosinophil (NE) were studied with electron microscopy. The effects of PAF on eosinophil activation and the action of dexamethasone or theophylline during the above process were measured. RESULTS: Hypodense eosinophil had significantly smaller individual granules than normodense eosinophil had. PAF induced eosinophil peroxidase release, and generated. Eosinophils incubated with 10-8 mmol/L PAF and 10-5 mmol/L dexamethasone released (101.17±10.32) mg/L eosinophil peroxidase (P<0.05). Eosinophils incubated with 10-9 mol/L PAF and 10-5 mmol/L dexamethasone caused a decrease in eosinophil peroxidase (110.85±4.16) mg/L and induced the generation of hypodense eosinophil (17.87%±2.16%). Eosinophils incubated with 10-8 mmol/L PAF and 10 mg/L theophylline released (100.53±9.65) mg/L eosinophil peroxidase (P<0.05). Eosinophils incubated with 10-9 mol/L PAF and 10 mg/L theophylline caused a similar decrease in eosinophil peroxidase (106.94±10.11) mg/L and induced the generation of hypodense eosinophil (14.08%±2.42%). CONCLUSIONS: Eosinophil degranulation is one of the reasons by which hypodense eosinopils develop. PAF induced eosinophil degranulation, so generated hypodense eosinopils. Dexamethasone and theophylline inhibited above effects. 相似文献
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AIM: To study the effects of dexamethasone (DXM) on intracellular expression of TH1/TH2 cytokines and the mechanism of that during the development of asthma. METHODS: Eighteen BALB/c mice were divided into 3 groups at random: control group, asthma group, and DXM treated group, with 6 mice in each. The expressions of T-box expressed in T cells (T-bet) and GATA-binding protein-3 (GATA-3) in lung tissue were detected by Western blotting. The expressions of intracellular cytokines interleukin-4 and interferon-γ in CD4+ T cell were measured by flowcytometry.RESULTS: The results of flow cytometry indicated that the ratio of intracellular cytokines IL-4/IFN-γ in CD4+ T cells in asthma group was much higher than that in control group (P<0.01), the ratio of intracellular IL-4/IFN-γ in T cells in DXM group was lower than that in asthma group significantly (P<0.01). The expression of T-bet in lung tissue in asthma group was lower than that in control group significantly (P<0.01), while GATA-3 was higher than that in control group significantly (P<0.01). The expressions of T-bet and GATA-3 in DXM group were much lower than those in asthma group (P<0.01), but the decreased degree of GATA-3 was more than that of T-bet. CONCLUSION: With pathological process of asthma, to reverse the ratio of IL-4/IFN-γ in CD4+ T cell by regulating T-bet and GATA-3 expression can improve the inflammatory reaction and may be one of the mechanisms of DXM in treating asthma. 相似文献
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AIM: To observe the changes of airway inflammation and remodeling in a murine model of chronic asthma with CpG- oligodeoxynucleotides(CpG ODN) and dexamethasone (DXM) treatments.METHODS: BALB/c mice were sensitized and repeatedly challenged with ovalbumin.Pathological slides were prepared from left lung and stained with hematoxylin-eosin.WAmus (smooth muscle area),Wamuc (mucous area) and WAi (inner wall area) of the airway were measured and standardized by Pbm (basement membrane perimeter). The areas of collagen Ⅰand Ⅲ in the lung tissue were determined by using a Sirius red-polarizing microscopy morphometry method.Expressions of matrix metalloprotease-9 (MMP-9) and tissue inhibitor of metalloproteinase-1 (TIMP-1) were detected by immunohistochemistry.RESULTS: WAmus/Pbm,WAmuc/Pbm and WAi/Pbm decreased significantly in CpG ODN and DXM treated group when compared with asthma group (P<0.05).No statistical significance between CpG ODN and DXM treated group was observed (P>0.05).Collagen deposition in asthma group increased more than that in CpG ODN and DXM treated group (P<0.05).The expressions of MMP-9 and TIMP-1 were much higher in asthma group than those in CpG ODN and DXM treated group (P<0.05).It had no statistical significance between CpG ODN and DXM treated group (P>0.05).CONCLUSION: Airway remodeling occurrs in the chronic asthma.Early intervention with steroid or CpG might partially inhibit its process via lowering expressions of MMP-9 and TIMP-1 in chronic asthma. 相似文献