【Objective】To study the effect of the specific p38 mitogen-activated protein kinase(p38 MAPK) inhibitor SB203580 on apoptosis of cerebellar granule neurons induced by low potassium.【Methods】Apoptosis was induced by switching the cultured cerebellar granule neurons from a culture medium containing K+ 25 mmol*L-1 to a medium containing K+ 5 mmol*L-1 (cLK).Fragmentation of DNA was analyzed using agarose gel eletrophoresis.SAPK/JNK activity was measured by SAPK/JNK assay kit.【Results】Low potassium resulted in apoptosis as characterized by morphological and biochemical features,but the specific p38 MAPK inhibitor SB203580 improved the survival of cerebellar granule neurons cultured in cLK medium by blocking apoptosis in a concentration-dependent manner.The expression and phosphorylation of c-Jun increased and the activity of c-Jun N-terminal protein kinase (JNK) elevated when cerebellar granule neurons were cultured in cLK medium.But when the cerebellar granule neurons cultured in cLK medium were exposed to 25 μmol*L-1 SB203580,the expression and phosphorylation of c-Jun and the activity of JNK were both decreased evidently.【Conclusions】These results indicate that SB203580 inhibits the activation of JNK and phosphorylation of c-Jun,and therefore protects granule neurons from apoptosis induced by low potassium.

Objective To evaluate the effect of high-frequency chest well oscillation expectoration system on ventilator-associated pneumonia (VAP) and time for withdrawing mechanical ventilation (MV) system in ICU patients with invasive mechanical ventilation (IMV). Methods 100 ICU patients with IMV were divided into observationgroup (n = 50) and control group (n = 50). The high-frequency chest well oscillation expectoration was used in the former group and the mechanical vibration expectoration was used in the latter. The two groups were compared in terms of amount of sputum, vital signs (heart rate, breathing, systolic blood pressure and blood oxygen saturation), time for withdrawing MV system and VAP rate. Results On days 1, 2, 3, 4 and 5, the amount of sputum in the observationgroup was (33.5 ± 4.2)mL/d, (41.1 ± 3.0)mL/d, (38.2± 3 .5) mL/d, (34.8 ± 2.5) mL/d and (31.1 ± 2.1) mL/d, and those of the control group respectively was (27.4 ± 3.1) mL/d, (30.3 ± 3.6) mL/d, (28.1 ± 2.2) mL/d, (25.7±1.8)mL/d and (20.8 ± 1.7)mL/d. The differences between the two groups were statistically significant (P < 0.05). After sputum expectoration, the blood oxygen saturation of the observationgroup was significantly higher than the control group [(97.5 ± 0.9) vs. (95.2 ± 1.0)] (P <0.05), but there were no statistical differences in heart rate, breathing and systolic blood pressure (P > 0.05). The time for withdrawing MV system in the observationgroup and the control group respectively was (5.8 ± 2.2)d and (9.5 ± 1.8)d, (P < 0.05). The rates of VAP in the observationgroup and the control group respectively was 30.0% (15/50) and 52.0% (26/50), with significant difference between them (P < 0.05). Conclusion The high-frequency chest well oscillation expectoration for ICU patients with invasive mechanical ventilation can promote sputum expectoration , improve blood oxygen saturation , shorten the time for withdrawing the ventilator, and prevent the incidence of VAP.

Objective To study the proliferation,collagen production and related gene expression in keloids and normal skin fibroblast.Methods Isolated primary cells of keloid fibroblasts (KFb,n=12) and normal human dermal fibroblasts (NFb,n=12) were identified,the cell viability and proliferating potential and the cell cycle were detected,and the difference on the collagen synthesis between KFb and NFb were compared.The expression of cell cycle-associated genes such as p21,p16,and p27 was dectected by real-time fluorescent quantitative PCR.Results The phase contrast optical microscopy imaging showed that both KFb isolated from keloid tissues and NFb from normal skin tissues possessed classic and similar fibroblast morphology.But there was a significant difference between cell proliferation,Hyp [(2.30±0.10) μg/ml vs.(1.66±0.13) μg/ml,P＜0.05] and collagen levels [(17.19±0.75) μg/ml vs.(12.37±0.94) μg/ml,P＜0.05].Compared with NFb,KFb exhibited more percentage of G2/M phase cells [(5.90±0.62)％ vs.(16.94 ％±1.93)％,P＜0.05]and less percentage of G0/G1 phase cells [(90.24 ±2.27)％ vs.(75.65±1.92)％,P＜0.05].Cell cycle related genes p16,p21 and p27 were low expressed.Collagen type Ⅰ was highly expressed at mRNA levels in KFb than that in NFb [0.84±0.11,1.32±0.2,1.69±0.12,4.33±0.27 in KFb vs.1.43±0.13,2.56±0.26,2.89±0.37,1.40±0.12 in NFb,P＜0.05].Conclusions There are cell dysfunction and abnormal cellular dynamics in keloid fibroblasts.The formation of keloid likely involves aberrant interactions of some genes that affected its development at different extents.

Objective To analyze the changes of HIV‐1 viral load and virological efficacy of treatment effects for AIDS patients treated with antiretroviral therapy from 2009 to 2014 in Lincang City .Methods Monitored the HIV‐1 viral load for 13 491 cases of AIDS patients treated with highly active antiretroviral therapy(HAART) from 2009-2014 in Lincang City of Yunnan and analyze the monitoring data .If the patients had treated with HAART were still with viral load greater than 1 000 copy/mL ,the treatment was defined as a failed treatment or a virological failure .Results The total rate of virological failure was 14 .34% (1 935/13 491) . The rate of virological failure of children group was 15 .53% (50/322) ,and of adults group was 14 .31% (1 885/13 169) .There was no statistically significant difference between childeren and adults(χ2 =0 .38 ,P>0 .38) .The rate of virological failure in males was 16 .34% (1 156/7 076) ,and 12 .14% (779/6 415) in females ,the difference was statistically significant between men and female (χ2 =48 .16 ,P<0 .01) .Conclusion Antiretroviral treatment can delay the disease progression and improve the life quality .

Objective To estimate the treatment effect of a tumor necrosis factor ? alpha antagonist (etanercept) on Stevens?Johnson syndrome induced by drugs. Methods After exclusion of tuberculosis, hepatitis, severe infections and tumors, 17 patients with drug?induced Stevens?Johnson syndrome were treated with subcutaneous injections of 25 mg(initial dose, 50 mg)etanercept once every 3 days for 6 times. Meanwhile, supportive therapies and compound glycyrrhizin injections were given to counteract inflammation and protect the liver. Results All of the patients were cured. Body temperature in 15 febrile patients gradually decreased within 24- 48 hours after the first injection of etanercept, and returned to normal in 72 hours. The number of vesicles stopped increasing, and lesion color turned from bright red to dull red within 24 hours. Skin condition was evidently controlled within 72 hours, and skin appearance almost returned to normal after 2 weeks of treatment, and was completely restored after 4- 5 weeks. The recovery of mucous membrane was slower than that of skin. Serum aminotransferase levels gradually declined after the first dose of etanercept and almost returned to normal in 2-4 weeks in 14 patients. Serum levels of urea nitrogen and creatinine began to decrease after 1- 2 weeks of treatment. The serum level of tumor necrosis factor?alpha nearly dropped into or was maintained in the normal range within 3 weeks after the start of treatment. Conclusion Early usage of tumor necrosis factor?alpha antagonists at an adequate dose is beneficial to the rapid control of Stevens?Johnson syndrome.

Objective To study the relationship between bronchial asthma and smoking status in Chinese people.Methods Asthma epidemiological survey and stratified-cluster-random method survey were performed in residents over 14 years in 8 provinces (cities) of China from February 2010 to August 2012.Asthma was diagnosed based upon case history,clinical signs and lung function test.Smoking status was investigated by questionnaire.Results Sampling population was 180 099 and 164 215 were valid.A total of 2 034 subjects were diagnosed as asthma including 79 692 men and 84 523 women.The overall prevalence rate of asthma was 1.24％ (2 034/164 215).Smokers were 23.8％ (39 137/164 215) in the whole population.Smokers were 34.5％ (702/2 034) in asthmatic patients,compared with 23.7％ (38 435/ 162 181) in no-asthmatic population.The incidence of asthma was 1.79％ and 1.06％ in smokers and nonsmokers respectively (P ＜0.001),suggesting that OR of smoking was 1.70 (95％ CI 1.55-1.86,P ＜ 0.001).According to asthma control test (ACT) score,the level of asthma control in non smoking group was higher than that in smoking group(43.2％ vs 35.3％).The times of hospitalization due to acute exacerbations (0.51 vs 0.41 events/person/year),total hospitalization rate (27.35 ％ vs 20.12％),annual emergency room visits (0.80 vs 0.60 events/person/year) and emergency room visit rate (31.77％ vs 24.47％) were all much higher in smoking asthmatic patients than those in non smoking asthmatic patients,indicating that the level of asthma control in smoking patients was significantly worse than in non smoking patients.Conclusions The smoking rate in Chinese people over 14 years is still high.The prevalence rate of asthma in smokers is significantly higher than that of non-smokers.The level of asthma control in smokers is significantly worse than that in non smokers.

Objective: To investigate the expression of IFIT2 (interferon-induced protein with tetratricopeptide repeats 2) in human lung cancer tissue and analyze the relationship between the IFIT2 expression and clinicopathological features and prognosis. Methods: Tissue microarray and immunofluorescence staining were used to examine the IFIT2 expression in lung cancer tissue and their adjacent tissues. Wilcoxon rank test was used to compare the IFIT2 expression in lung cancer and corresponding adjacent tissues. The chi-square test was used to analyze the relationship between the IFIT2 expression in lung cancer tissues and clinicopathological features of the patients. Kaplan-Meier survival analysis was performed to analyze the correlation between IFIT2 expression and patients′ overall survival. Cox model was used to analyze the correlation between different clinical parameters and prognosis. Results: There was significant difference for the IFIT2 expression between the lung cancer tissues and adjacent tissues (P＜0.01). There was no significant correlation between IFIT2 expression and clinicopathological features of patients (P＞0.05). In lung adenocarcinoma and squamous cell carcinoma, Kaplan-Merier survival analysis showed that the overall survival (OS) of patients in IFIT2 low expression group was significantly shorter than that in IFIT2 high expression group (HR=2.392, 95%CI: 1.103-5.186, P=0.027; HR=2.907, 95%CI: 1.118-7.559, P=0.029, respectively). Multi-factor Cox model analysis indicated that distant metastasis (HR=8.033, 95% CI: 3.664-17.614, P=0.000) was independent prognostic factors for lung adenocarcinoma, lymph node metastasis (HR=3.390, 95% CI: 1.029-11.175, P=0.045) and IFIT2 low expression (HR=3.762,95%CI: 1.236-11.451, P=0.020) were independent prognostic factors for lung squamous cell carcinoma. Conclusion The down-regulated expression of IFIT2 in lung cancer tissues suggests that it may play an important role in initiation and development of lung cancer. It could be used as a valuable risk factor to predict the prognosis of lung cancer patients.