Effect of MKK34 on airway β-catenin in a HDM-induced mouse asthma / 实用医学杂志

Objective To explore the role of MKK34 (a peptide spanning a C-terminal α-helical region in TSLP) on airway inflammation and β-catenin of airway epithelium in a HDM-induced mouse asthma.Methods 32 male BALB/c mice were randomly divided into control,MKK34,asthma and MKK34 + HDM groups.The mice in the asthma group were exposed to HDM for five consecutive days and the MKK34 + HDM group was pretreated with MKK34 1 h prior to the HDM intranasally treated.After 8 weeks' treatment,animal lung function test and pathological staining were performed to evaluate the asthma situation,IL-4,IFN-γin bronchoalveolar lavage fluid and IgE in the serum were detected,immunohistochemistry and western blot were used to assess β-catenin and p-ERK,t-ERK levels.Results Airway reactivity,IL-4 and IgE in the asthma group were significantly higher than that in the control group.Treatment with MKK34 significantly decreased airway hyperresponsiveness,IL-4 and IgE.HE staining demonstrated the chronic bronchitic inflammation in the lungs of asthma group.β-catenin in the control group was distributed evenly at the cytomembrane of epithelial cells.In the asthma group,β-catenin was disordered in epithelial cells and its expression was decreased.Treatment with MKK34 ameliorated the damage of β-catenin and chronic bronchitic inflammation.The protein levels of p-ERK1/2 increased obviously in the asthma group.The pretreated group significantly decreased the expression of p-ERK1/2.Conclusions MKK34 can ameliorate the airway inflammation and the destruction of β-catenin of airway epithelium in a HDM-induced mouse asthma.The ERK pathway may play a role in this process.

1,25(OH)2D3 protects against BLM-induced pulmonary fibrosis by inhibiting activation of STAT3 / 实用医学杂志

Objective To investigate the impact of 1,25(OH)2D3 on histological changes and activation of STAT3 in BLM?induced pulmonary fibrosis mice. Methods 30 male C57BL/6 mice were randomly divided into control group ,BLM group and BLM+VD group. Mice in BLM group and BLM+VD group received intratracheal injection of BLM(3 U/kg). Control group were intratracheally injected equal volume of sterile saline. From the first day after the surgery,mice in BLM+VD group received intraperitoneal injection of VD (5μg/kg·d). After 21 days, H&E and Masson′s trichrome staining were carried out. Aschroft score were used to evaluate histological changes in lungs. IL?6,IL?4 and INF?γin BALF were assessed by Elisa. p?STAT3,α?SMA and Collagen I were detected by western blot (WB) and immunohistochemistry. Results Fibrosis score and level of α?SMA,Collagen I in BLM group were significantly higher than that in control group (P < 0.05). However ,treatment with VD effectively at?tenuated fibrosis (P<0.05). IL?6 and IL?4 increased while INF?γwas decreased in BALF of BLM group (P<0.05). VD could ameliorate these changes. Upregulation and neuclear translocation of p?STAT3 were observed in BLM group,while VD intervention could inhibit phosphorylation of STAT3. Conclusions VD attenuate BLM?induced pulmonary fibrosis and regulate inflammatory cytokines probably by blocking STAT3 activation.

Effect of ethyl pyruvate on E-cadherin of airway epithelium in a TDI-induced mouse asthma / 实用医学杂志

Objective To explore the role of ethyl pyruvate (EP) on E-cadherin of airway epithelium and airway inflammation in a TDI-induced mouse asthma model. Methods 30 male BALB/c mice were randomly divided into control group , asthma group and EP group. On day 1 and 8 , mice in asthma group and EP group were treated with 0.3%TDI on the dorsum of both ears for sensitization. And on day 15 , 18 and 21 the mice underwent an aerosol inhalation of 3% TDI, and saline (100 mg/kg) was injected intraperitoneally 1 hour before inhalation. The control group underwent acetone and olive oil (AOO) sensitization on day 1 and 8, AOO challenge on day 15, 18 and 21. Saline (100 mg/kg) was injected intraperitoneally 1 hour before challenge. One hour before each challenge, mice were given EP (100mg/kg) or vehicle via intraperitoneal injection. On day 22, airway reactivity, IL-4 , IFN-γand IgE in the serum were detected , immunohistochemistry and WB were used to assess E-cadherin levels. Results Airway reactivity, IL-4, IFN-γin and IgE in the serum in asthma group are significantly higher than that in control group (P<0.05). Treatment with EP dramatically decreased airway hyperresponsiveness in TDI-challenged mice, as well as IL-4, IFN-γ and IgE (P < 0.05). E-cadherin in control group was distributed evenly at the connection of epithelial cells. E-cadherinin distribution was chaotic and its expression was decreased in asthma group. EP intervention can ameliorate the damage of E-cadherinin. Conclusions EP can ameliorate the destruction of E-cadherin in airway epithilum by TDI.

Effect of thymic stromal lymphopoietin on human bronchial epithelial permeability / 南方医科大学学报

<p><b>OBJECTIVE</b>To investigate the effect of thymic stromal lymphopoietin (TSLP) on the permeablily of monolayer bronchial epithelial cells in vitro.</p><p><b>METHODS</b>Cultured human bronchial epithelial cell line 16HBE was exposed to 0.1 or 1 ng/ml TSLP for 0, 0.5, 6, 12, or 24 h, and the epithelial monolayer permeability was assessed by measuring transepithelial electrical resistance (TER), permeability to FITC-labeled dextran (FITC-DX) and expression of E-cadherin.</p><p><b>RESULTS</b>Compared with the control cells group, 16HBE cell monolayer showed significantly increased TER (P<0.001) and decreased FITC-DX fluorescence in the lower chamber (P<0.05) following exposure to 0.1 and 1 ng/ml TSLP, but these changes were not dose-dependent. Exposure to 0.1 ng/ml TSLP resulted in significantly increased expression of E-cadherin. The 16HBE monolayer exposed to 0.1 ng/ml TSLP for 24 h showed the most obvious increase of TER and E-cadherin expression (P<0.05); FITC-DX fluorescence level was markedly decreased after TSLP exposure for 12 h and 24 h (P<0.05), and the effect was more obvious in 12 h group.</p><p><b>CONCLUSION</b>TSLP can protect the barrier function of normal bronchial epithelial cells in vitro.</p>

1,25-dihydroxyvitamin D3 pretreatment inhibits house dust mite-induced thymic stromal lymphopoietin release by human airway epithelial cells / 南方医科大学学报

<p><b>OBJECTIVE</b>To investigate the effect of 1,25-dihydroxyvitamin D3 (1,25VD3) on house dust mites (HDM)-induced expression of thymic stromal lymphopoietin (TSLP) in human airway epithelial cells in vitro.</p><p><b>METHODS</b>Human airway epithelial 16HBE cells were incubated with 200, 400, and 800 U/L in the absence or presence of 1,25VD3 (10(-8) mol/L) for 6 h and 24 h, and TSLP mRNA and protein expressions in the cells were assessed using quantitative PCR and ELISA.</p><p><b>RESULTS</b>16HBE cells incubated with HDM at 200, 400, and 800 U/L showed significantly increased TSLP mRNA and protein expressions (P<0.05). Pretreatment of the cells with 1,25VD3 obviously lowered 400 U/L HDM-induced TSLP expressions (P<0.05), but 1,25VD3 added along with HDM in the cells did not produce significant effects on TSLP expressions (P=0.58).</p><p><b>CONCLUSION</b>Both 1,25VD3 and HDM can induce TSLP expression and release in 16HBE cells, but pretreatment with 1,25VD3 can decrease HDM-augmented TSLP expression in the cells.</p>

High-mobility group box protein 1 in synergy with interleukin-1β promotes interleukin-8 expression in human airway epithelial cells in vitro / 南方医科大学学报

<p><b>OBJECTIVE</b>To test the effect of high-mobility group box protein 1 (HMGB1) alone or in synergy with interleukin-1β (IL-1β) on the expression of IL-8 in human airway epithelial cells in vitro.</p><p><b>METHODS</b>Human airway epithelial 16HBE and A549 cell lines were incubated with HMGB1 (100 ng/ml) in the absence or presence of IL-1β (10 ng/ml) for 24 h, and the changes of IL-8 mRNA and protein expressions were assessed using quantitative PCR and enzyme-linked immunosorbent assay (ELISA).</p><p><b>RESULTS</b>In the two human airway epithelial cell lines, HMGB1 alone did not produce obvious effect on the expression of IL-8, but in the presence of IL-1β, HMGB1 caused a significant increase of IL-8 expressions at both the mRNA and protein levels.</p><p><b>CONCLUSION</b>HMGB1 in synergy with IL-1β increases the expression of IL-8 in human airway epithelial cells, which provides new evidence that HMGB1 contributes to neutrophilic airway inflammation by regulating IL-8 expression.</p>

Effect of 25-hydroxyvitamin D(3) on vitamin D receptor expression and distribution in human bronchial epithelial cells in vitro / 南方医科大学学报

<p><b>OBJECTIVE</b>To evaluate the effect of 25-hydroxyvitamin D(3) on the expression and distribution of vitamin D receptor in normal human bronchial epithelial cells.</p><p><b>METHODS</b>MTT assay was used to assess the viability of human airway epithelial cell line 16HBE following a 24-h exposure to different concentrations of 25-hydroxyvitamin D(3). Real-time quantitative PCR, Western blotting, and immunofluorescence assay were used to observe the expression and distribution of vitamin D receptor in the cells following the exposure.</p><p><b>RESULTS</b>Compared with the control cells, 16HBE cells exposed to different concentrations of 25-hydroxyvitamin D(3) exhibited no significantly increase in the expression or distribution of vitamin D receptor.</p><p><b>CONCLUSION</b>The influence of 25-hydroxyvitamin D(3) on bronchial epithelial cells might be independent of the expression and translocation of vitamin D receptor.</p>