Zeolitic imidazolate framework-8(ZIF-8)is a typical filler used to fabricate mixed matrix membranes(MMMs)on account of its attractive advantage of high selective permeability for gas separation.However,the performance...Zeolitic imidazolate framework-8(ZIF-8)is a typical filler used to fabricate mixed matrix membranes(MMMs)on account of its attractive advantage of high selective permeability for gas separation.However,the performance is usually affected by filler aggregation due to strong interactions among fillers and weak interactions between the polymer and fillers,However,the performance is usually affected by filler aggregation due to strong interactions among fillers and weak interactions between the polymer and fillers,which will lead to a decrease of selectivity and the performance of gas separation will be strongly influenced.Herein,we modified ZIF-8 with 3-amino-1,2,4-triazole to obtain ZIF-8-NH_(2),Kapton polyamide acid was selected as the polymer matrix.Results showed that the ZIF-8-NH_(2)/Kapton MMMs has a good compatibility interface between ZIF-8 and Kapton because of the covalent bridging,even the filler loading up to 45%(mass).The 45%(mass)of ZIF-8-NH_(2)/Kapton membrane showed 297 barrer(1 barrer=10^(-10)10 cm^(3)·cm·cm^(-2)·s^(-1)·cmHg^(-1),1 cmHg=1333.22 Pa,standard temperature and pressure)of the permeability of H_(2)and 43.9 and 62.2 of selectivities for H_(2)/N_(2)and for H_(2)/CH_(4),respectively,which are beyond the upper limit of Robeson 2008.展开更多
BACKGROUND: Interstitial collagenase has been considered as an essential enzyme for collagenolysis in liver fi-brosis, because type Ⅰ and Ⅲ collagens increase predominantly in liver fibrosis. The present study aimed...BACKGROUND: Interstitial collagenase has been considered as an essential enzyme for collagenolysis in liver fi-brosis, because type Ⅰ and Ⅲ collagens increase predominantly in liver fibrosis. The present study aimed to demonstrate the gene expression of matrix metalloproteinases-13 (MMP-13) in the progressive phases of ethanol induced experimental liver fibrosis in rats. METHODS: Thirty-four Sprague-Dawley rats were randomly divided into two groups. The experimental group (24 rats) was given ethanol (44% , 7 g/kg) every day and the control group (10) was given normal saline. Liver samples were harvested from experimental rats at 4, 12 and 24 weeks respectively. The kinetics of MMP-13 mRNA expression was assayed by semi-quantity reverse transcriptase-poly-merase chain reaction (RT-PCR). RESULTS: In normal rat liver, a faint band for MMP-13 mRNA was observed by RT-PCR (0.24±0.41). The gene expression of MMP-13 was increased in the liver of the rats treated with ethanol for 4 weeks (0. 62 ±0. 54), but it was not considered statistically significant (P >0.05). And the livers from 12-week-treated rats showed a marked mRNA expression(1.65 ±0.47, P <0. 01). Once fibrosis became prominent (24 weeks), a faint band of MMP-13 mRNA was observed (0.39±0.25). CONCLUSION: MMP-13 participates in the degradation of newly-formed matrix in the early phase of rat liver fibrosis induced by ethanol, and it was induced in a distinct time frame.展开更多
Objective： To investigate the relationship between matrix metalloproteinases-9 （MMP-9） and sialyl Lewis X （CD15s） antigen in invasion and metastasis of gastric carcinoma. Methods： Expression of CD105, MMP-9 and ...Objective： To investigate the relationship between matrix metalloproteinases-9 （MMP-9） and sialyl Lewis X （CD15s） antigen in invasion and metastasis of gastric carcinoma. Methods： Expression of CD105, MMP-9 and CD15s in 47 cases of gastric carcinoma undergone radical surgery were evaluated by SP immunohistochemical staining using the respective monoclonal antibody. The microvessel density （MVD） marked with CD105 was detected. Correlation between MVD and MMP-9, CD15s was also statistically analyzed. Results： The MVD in both MMP-9 and CD15s positive expression group was higher significantly than that in MMP-9 or CD15s positive expression alone group, and it was also significantly higher than that in both MMP-9 and CD15s negative expression group. Conclusion： MMP-9 is a marker of invasion and CD15s is a marker of metastasis in gastric carcinoma. Combining detection of MMP-9 and CD15s has certain clinical significance for diagnosis, treatment and assessing the prognosis for gastric caner.展开更多
Objective To study the clinical role of the variation of serum matrix metalloproteinase-8 (MMP-8) concentration in patients with acute coronary syndrome (ACS). Methods ELISA method was adopted to detect serum MMP-8 co...Objective To study the clinical role of the variation of serum matrix metalloproteinase-8 (MMP-8) concentration in patients with acute coronary syndrome (ACS). Methods ELISA method was adopted to detect serum MMP-8 concentration and to observe concentration’s differences and features among 80 selected ACS cases (43 acute myocardial infarction and 37 unstable angina pectoris), 43 stable angina pectoris (SAP) cases and 37 control cases. And meanwhile the atherosclerosis risk factors of each case, such as age, sex, hypertension, body mass index, smoking, family history, diabetes, and hyperlipidemia were collected and analyzed as a whole. Results First, serum MMP-8 concentration reached the highest point in ACS, and there was significant difference between SAP and control groups (P<0.01). Second, serum MMP-8 in AMI was much higher than that in UAP with significant difference (P<0.01). There was no difference between UAP and SAP groups (P>0.05). Third, Logistic regression analysis revealed that serum MMP-8 concentration might be the indicator of ACS (B=4.493, P=0.000), particularly, that of AMI (B=9.961, P=0.000). Fourth, linear correlation and linear regression analysis found that only neutrophil was likely to influence serum MMP-8 concentration (r=0.274, P=0.001). Fifth, in the diagnosis of ACS, the area under ROC curve of MMP-8 was 0.785, the sensitivity and specificity were 68.6% and 76.5%, respectively. Conclusion ① Serum MMP-8 concentration has close relationship with the occurrence of ACS, particularly with AMI; ② Serum MMP-8 concentration may be one of the predicting indicators of ACS and particularly of AMI; ③ Neutrophil may be correlated with serum MMP-8 concentration; ④ MMP-8 is of somewhat valuable in diagnosing ACS.展开更多
Ulcerative colitis （UC） is a lifelong illness with profound emotional and social impacts, and could cause serious damage to large intestine, especially in colon. However, the pathogenesis of UC remained unclear. The...Ulcerative colitis （UC） is a lifelong illness with profound emotional and social impacts, and could cause serious damage to large intestine, especially in colon. However, the pathogenesis of UC remained unclear. The present study attempts to find out the role of matrix metalloproteinases-7 （MMP-7） and lysozyme in the pathogenesis of UC through a mice model induced by dextran sulfate sodium （DSS）. The UC model was evaluated both by disease activity index （DAI） and the intestinal histopathology. The results show that there is a high correlation between the DAI score and the pathological changes of colon. Interleukin-6 （IL-6） serum levels and large intestinal fluids levels in UC mice are always higher than that of the control groups, which might be associated with the degree of the inflammation damage in the colon. The change tendency of the MMP-7 mRNA and protein expressions are both up-regulated firstly and then down-regulated from 1 to 5 d in the colon, but only the MMP-7 protein is up-regulated at 7 d again. The up-regulated MMP-7 levels in the early stage of UC may play a protective role through the activated defensins, while the down-regulated levels in the mid-later stage of UC may be connected with the severe lesions in the colon. However, the up-regulated MMP-7 levels in the later stage of UC in the colon may also contribute to the tissue repair or be served as a marker to CRC （colorectal cancer）. The distribution of lysozyme protein indicates that there may be Paneth-like cells in the colon. Both the changes of MMP-7 and lysozyme in the small intestine may play a protective role for the safe environment of the whole gut, especially to the colon of UC.展开更多
目的探讨麝香保心丸联合阿托伐他汀治疗急性冠脉综合征(ACS)患者的疗效及对血脂、血清基质金属蛋白酶8(MMP-8)和基质金属蛋白酶组织抑制因子1(TIMP-1)的影响。方法160例ACS患者随机分为观察组(n=80)和对照组(n=80)。对照组给予阿托伐他...目的探讨麝香保心丸联合阿托伐他汀治疗急性冠脉综合征(ACS)患者的疗效及对血脂、血清基质金属蛋白酶8(MMP-8)和基质金属蛋白酶组织抑制因子1(TIMP-1)的影响。方法160例ACS患者随机分为观察组(n=80)和对照组(n=80)。对照组给予阿托伐他汀治疗,观察组在对照组基础上给予麝香保心丸治疗。比较两组冠脉介入疗效,总胆固醇(TC)、三酰甘油(TG)、低密度脂蛋白胆固醇(LDL-C)及高密度脂蛋白胆固醇(HDL-C)等血脂指标水平,MMP-8、TIMP-1、C反应蛋白(CRP)和白细胞介素6(IL-6)等炎症因子水平,左心室收缩末期容积(LVESV)、左心室舒张末期容积(LVEDV)、左心室舒张末期容积指数(LVEDVI)及左心室射血分数(LVEF)等心功能指标水平,以及30 d主要心血管不良事件(MACE)发生情况。结果两组冠脉介入治疗总有效率比较,差异无统计学意义(χ^(2)=1.56,P>0.05);治疗后,观察组TC、TG、LDL-C水平均明显低于对照组,HDL-C水平明显高于对照组(t分别=2.30、2.03、2.57、-3.64,P均<0.05),观察组血脂达标率为43.33%,明显高于对照组血脂达标率25.00%(χ^(2)=4.48,P<0.05);治疗后,观察组MMP-8、CRP、IL-6水平及LVESV、LVEDV、LVEDVI均明显低于对照组,TIMP-1水平、LVEF明显高于对照组(t分别=2.29、2.19、8.55、2.17、2.29、2.37、-2.97、-2.40,P均<0.05);两组30 d MACE发生率比较,差异无统计学意义(χ^(2)=0.12,P>0.05)。结论麝香保心丸联合阿托伐他汀治疗ACS患者可有效改善患者血脂、心功能及降低炎症水平,利于稳定斑块。展开更多
基金funded by National Natural Science Foundation of China(22278023)Beijing Municipal Science and Technology Planning Project(Z221100002722002)+1 种基金Beijing Natural Science Foundation(2222015)the long-term from the Ministry of Finance and the Ministry of Education of China.
文摘Zeolitic imidazolate framework-8(ZIF-8)is a typical filler used to fabricate mixed matrix membranes(MMMs)on account of its attractive advantage of high selective permeability for gas separation.However,the performance is usually affected by filler aggregation due to strong interactions among fillers and weak interactions between the polymer and fillers,However,the performance is usually affected by filler aggregation due to strong interactions among fillers and weak interactions between the polymer and fillers,which will lead to a decrease of selectivity and the performance of gas separation will be strongly influenced.Herein,we modified ZIF-8 with 3-amino-1,2,4-triazole to obtain ZIF-8-NH_(2),Kapton polyamide acid was selected as the polymer matrix.Results showed that the ZIF-8-NH_(2)/Kapton MMMs has a good compatibility interface between ZIF-8 and Kapton because of the covalent bridging,even the filler loading up to 45%(mass).The 45%(mass)of ZIF-8-NH_(2)/Kapton membrane showed 297 barrer(1 barrer=10^(-10)10 cm^(3)·cm·cm^(-2)·s^(-1)·cmHg^(-1),1 cmHg=1333.22 Pa,standard temperature and pressure)of the permeability of H_(2)and 43.9 and 62.2 of selectivities for H_(2)/N_(2)and for H_(2)/CH_(4),respectively,which are beyond the upper limit of Robeson 2008.
文摘BACKGROUND: Interstitial collagenase has been considered as an essential enzyme for collagenolysis in liver fi-brosis, because type Ⅰ and Ⅲ collagens increase predominantly in liver fibrosis. The present study aimed to demonstrate the gene expression of matrix metalloproteinases-13 (MMP-13) in the progressive phases of ethanol induced experimental liver fibrosis in rats. METHODS: Thirty-four Sprague-Dawley rats were randomly divided into two groups. The experimental group (24 rats) was given ethanol (44% , 7 g/kg) every day and the control group (10) was given normal saline. Liver samples were harvested from experimental rats at 4, 12 and 24 weeks respectively. The kinetics of MMP-13 mRNA expression was assayed by semi-quantity reverse transcriptase-poly-merase chain reaction (RT-PCR). RESULTS: In normal rat liver, a faint band for MMP-13 mRNA was observed by RT-PCR (0.24±0.41). The gene expression of MMP-13 was increased in the liver of the rats treated with ethanol for 4 weeks (0. 62 ±0. 54), but it was not considered statistically significant (P >0.05). And the livers from 12-week-treated rats showed a marked mRNA expression(1.65 ±0.47, P <0. 01). Once fibrosis became prominent (24 weeks), a faint band of MMP-13 mRNA was observed (0.39±0.25). CONCLUSION: MMP-13 participates in the degradation of newly-formed matrix in the early phase of rat liver fibrosis induced by ethanol, and it was induced in a distinct time frame.
文摘Objective： To investigate the relationship between matrix metalloproteinases-9 （MMP-9） and sialyl Lewis X （CD15s） antigen in invasion and metastasis of gastric carcinoma. Methods： Expression of CD105, MMP-9 and CD15s in 47 cases of gastric carcinoma undergone radical surgery were evaluated by SP immunohistochemical staining using the respective monoclonal antibody. The microvessel density （MVD） marked with CD105 was detected. Correlation between MVD and MMP-9, CD15s was also statistically analyzed. Results： The MVD in both MMP-9 and CD15s positive expression group was higher significantly than that in MMP-9 or CD15s positive expression alone group, and it was also significantly higher than that in both MMP-9 and CD15s negative expression group. Conclusion： MMP-9 is a marker of invasion and CD15s is a marker of metastasis in gastric carcinoma. Combining detection of MMP-9 and CD15s has certain clinical significance for diagnosis, treatment and assessing the prognosis for gastric caner.
文摘Objective To study the clinical role of the variation of serum matrix metalloproteinase-8 (MMP-8) concentration in patients with acute coronary syndrome (ACS). Methods ELISA method was adopted to detect serum MMP-8 concentration and to observe concentration’s differences and features among 80 selected ACS cases (43 acute myocardial infarction and 37 unstable angina pectoris), 43 stable angina pectoris (SAP) cases and 37 control cases. And meanwhile the atherosclerosis risk factors of each case, such as age, sex, hypertension, body mass index, smoking, family history, diabetes, and hyperlipidemia were collected and analyzed as a whole. Results First, serum MMP-8 concentration reached the highest point in ACS, and there was significant difference between SAP and control groups (P<0.01). Second, serum MMP-8 in AMI was much higher than that in UAP with significant difference (P<0.01). There was no difference between UAP and SAP groups (P>0.05). Third, Logistic regression analysis revealed that serum MMP-8 concentration might be the indicator of ACS (B=4.493, P=0.000), particularly, that of AMI (B=9.961, P=0.000). Fourth, linear correlation and linear regression analysis found that only neutrophil was likely to influence serum MMP-8 concentration (r=0.274, P=0.001). Fifth, in the diagnosis of ACS, the area under ROC curve of MMP-8 was 0.785, the sensitivity and specificity were 68.6% and 76.5%, respectively. Conclusion ① Serum MMP-8 concentration has close relationship with the occurrence of ACS, particularly with AMI; ② Serum MMP-8 concentration may be one of the predicting indicators of ACS and particularly of AMI; ③ Neutrophil may be correlated with serum MMP-8 concentration; ④ MMP-8 is of somewhat valuable in diagnosing ACS.
基金the grants from the National Natural Science Foundation of China(30800812)
文摘Ulcerative colitis （UC） is a lifelong illness with profound emotional and social impacts, and could cause serious damage to large intestine, especially in colon. However, the pathogenesis of UC remained unclear. The present study attempts to find out the role of matrix metalloproteinases-7 （MMP-7） and lysozyme in the pathogenesis of UC through a mice model induced by dextran sulfate sodium （DSS）. The UC model was evaluated both by disease activity index （DAI） and the intestinal histopathology. The results show that there is a high correlation between the DAI score and the pathological changes of colon. Interleukin-6 （IL-6） serum levels and large intestinal fluids levels in UC mice are always higher than that of the control groups, which might be associated with the degree of the inflammation damage in the colon. The change tendency of the MMP-7 mRNA and protein expressions are both up-regulated firstly and then down-regulated from 1 to 5 d in the colon, but only the MMP-7 protein is up-regulated at 7 d again. The up-regulated MMP-7 levels in the early stage of UC may play a protective role through the activated defensins, while the down-regulated levels in the mid-later stage of UC may be connected with the severe lesions in the colon. However, the up-regulated MMP-7 levels in the later stage of UC in the colon may also contribute to the tissue repair or be served as a marker to CRC （colorectal cancer）. The distribution of lysozyme protein indicates that there may be Paneth-like cells in the colon. Both the changes of MMP-7 and lysozyme in the small intestine may play a protective role for the safe environment of the whole gut, especially to the colon of UC.
文摘目的探讨麝香保心丸联合阿托伐他汀治疗急性冠脉综合征(ACS)患者的疗效及对血脂、血清基质金属蛋白酶8(MMP-8)和基质金属蛋白酶组织抑制因子1(TIMP-1)的影响。方法160例ACS患者随机分为观察组(n=80)和对照组(n=80)。对照组给予阿托伐他汀治疗,观察组在对照组基础上给予麝香保心丸治疗。比较两组冠脉介入疗效,总胆固醇(TC)、三酰甘油(TG)、低密度脂蛋白胆固醇(LDL-C)及高密度脂蛋白胆固醇(HDL-C)等血脂指标水平,MMP-8、TIMP-1、C反应蛋白(CRP)和白细胞介素6(IL-6)等炎症因子水平,左心室收缩末期容积(LVESV)、左心室舒张末期容积(LVEDV)、左心室舒张末期容积指数(LVEDVI)及左心室射血分数(LVEF)等心功能指标水平,以及30 d主要心血管不良事件(MACE)发生情况。结果两组冠脉介入治疗总有效率比较,差异无统计学意义(χ^(2)=1.56,P>0.05);治疗后,观察组TC、TG、LDL-C水平均明显低于对照组,HDL-C水平明显高于对照组(t分别=2.30、2.03、2.57、-3.64,P均<0.05),观察组血脂达标率为43.33%,明显高于对照组血脂达标率25.00%(χ^(2)=4.48,P<0.05);治疗后,观察组MMP-8、CRP、IL-6水平及LVESV、LVEDV、LVEDVI均明显低于对照组,TIMP-1水平、LVEF明显高于对照组(t分别=2.29、2.19、8.55、2.17、2.29、2.37、-2.97、-2.40,P均<0.05);两组30 d MACE发生率比较,差异无统计学意义(χ^(2)=0.12,P>0.05)。结论麝香保心丸联合阿托伐他汀治疗ACS患者可有效改善患者血脂、心功能及降低炎症水平,利于稳定斑块。
