AIM:To investigate the ability of agonists of PAR-2 to stimulate release of tryptase and histamine from human colon mast cells and the potential mechanisms.METHODS:Enzymatically dispersed cells from human colons were ...AIM:To investigate the ability of agonists of PAR-2 to stimulate release of tryptase and histamine from human colon mast cells and the potential mechanisms.METHODS:Enzymatically dispersed cells from human colons were challenged with tc-LIGRLO, tc-OLRGIL, SLIGKV,VKGILS, trypsin, anti-IgE or calcium ionophore A23187,and the cell supematants after challenge were collected. Tryptase release was determined with a sandwich ELISA procedure and histamine release was measured using a glass fibrebased fluorometric assay.RESULTS: Both PAR-2 agonists tc-LIGRLO-NH2 and SLIGKVNH2 were able to induce dose dependent release of tryptase and histamine from colon mast cells. More than 2.5 fold increase in both tryptase and histamine release was provoked by 100μmol/mL tc-LIGRLO-NH2, in comparison with only 2.0 fold increase being stimulated by SLIGKV-NH2，The reverse peptides tc-OLRGIL-NH2 and VKGILS-NH2 at the concentrations tested had no effect on the release of these two mediators.The maximum tryptase release elicited by tc-LIGRLO-NH2 was similar to that induced by anti-IgE(10μg/mL) or calcium ionophore (1μg/mL), though the latter was a more potent stimulus for histamine release.Both histamine and tryptase release in response to tc-LIGRLONH2 were completed within 3 rain. Trypsin at concentrations from 1.0 to 100μg/mL was capable of provoking a dose dependent release of tryptase as well as histamine with a maximum of 16ng/mL tryptase and 14ng/mL histamine release being achieved. An approximately 80% and 70% inhibition of trypsin induced release of tryptase and histamine were observed with SBTI, respectively. Pretreatment of cells with metabolic inhibitors or pertussis toxin abolished the actions of tc-LIGRLO-NH2, SLIGKV-NH2 and trypsin.CONCLUSION: The agonists of PAR-2 and trypsin are potent secretagogues of human colon mast cells, which are likely to contribute to the development of inflammatory disorders in human gut.展开更多
厚朴系木兰科植物厚朴Magnolia officinalis或凹叶厚朴M. officinalis var. biloba的干燥干皮、根皮及枝皮,具有燥湿消痰、下气除满的功效。厚朴提取物、厚朴酚及和厚朴酚是厚朴抗炎的主要活性成分,其抗炎机制有:阻滞磷脂酰肌醇-3激酶/...厚朴系木兰科植物厚朴Magnolia officinalis或凹叶厚朴M. officinalis var. biloba的干燥干皮、根皮及枝皮,具有燥湿消痰、下气除满的功效。厚朴提取物、厚朴酚及和厚朴酚是厚朴抗炎的主要活性成分,其抗炎机制有:阻滞磷脂酰肌醇-3激酶/蛋白激酶B(PI3K/Akt)、细胞外调节蛋白激酶/丝裂原活化蛋白激酶(ERK/MAPK)和把关受体-2/丝裂原活化蛋白激酶(TLR/MAPK)信号通路,抑制炎性细胞因子表达;还可通过直接抑制诱导型一氧化氮合酶(iNOS)、环氧化酶-2(COX-2)、5-脂氧化酶(5-LO)的酶活性,阻滞炎症介质一氧化氮、前列腺素(PGs)、白三烯(LTs)的合成和释放,以及抑制组织胺释放等,产生广谱的抗炎作用。厚朴提取物、厚朴酚及和厚朴酚的抗氧化活性也是其抗炎作用的主要机制之一。厚朴为常用的非毒性中药,可以把研究重点放在防治慢性的或退行性疾病的微炎症方面。展开更多
基金Supported by the National Natural Science Foundation of China,No.30140023,and the Li Ka Shing Foundation,Hong Kong,China,No.C0200001
文摘AIM:To investigate the ability of agonists of PAR-2 to stimulate release of tryptase and histamine from human colon mast cells and the potential mechanisms.METHODS:Enzymatically dispersed cells from human colons were challenged with tc-LIGRLO, tc-OLRGIL, SLIGKV,VKGILS, trypsin, anti-IgE or calcium ionophore A23187,and the cell supematants after challenge were collected. Tryptase release was determined with a sandwich ELISA procedure and histamine release was measured using a glass fibrebased fluorometric assay.RESULTS: Both PAR-2 agonists tc-LIGRLO-NH2 and SLIGKVNH2 were able to induce dose dependent release of tryptase and histamine from colon mast cells. More than 2.5 fold increase in both tryptase and histamine release was provoked by 100μmol/mL tc-LIGRLO-NH2, in comparison with only 2.0 fold increase being stimulated by SLIGKV-NH2，The reverse peptides tc-OLRGIL-NH2 and VKGILS-NH2 at the concentrations tested had no effect on the release of these two mediators.The maximum tryptase release elicited by tc-LIGRLO-NH2 was similar to that induced by anti-IgE(10μg/mL) or calcium ionophore (1μg/mL), though the latter was a more potent stimulus for histamine release.Both histamine and tryptase release in response to tc-LIGRLONH2 were completed within 3 rain. Trypsin at concentrations from 1.0 to 100μg/mL was capable of provoking a dose dependent release of tryptase as well as histamine with a maximum of 16ng/mL tryptase and 14ng/mL histamine release being achieved. An approximately 80% and 70% inhibition of trypsin induced release of tryptase and histamine were observed with SBTI, respectively. Pretreatment of cells with metabolic inhibitors or pertussis toxin abolished the actions of tc-LIGRLO-NH2, SLIGKV-NH2 and trypsin.CONCLUSION: The agonists of PAR-2 and trypsin are potent secretagogues of human colon mast cells, which are likely to contribute to the development of inflammatory disorders in human gut.
文摘厚朴系木兰科植物厚朴Magnolia officinalis或凹叶厚朴M. officinalis var. biloba的干燥干皮、根皮及枝皮,具有燥湿消痰、下气除满的功效。厚朴提取物、厚朴酚及和厚朴酚是厚朴抗炎的主要活性成分,其抗炎机制有:阻滞磷脂酰肌醇-3激酶/蛋白激酶B(PI3K/Akt)、细胞外调节蛋白激酶/丝裂原活化蛋白激酶(ERK/MAPK)和把关受体-2/丝裂原活化蛋白激酶(TLR/MAPK)信号通路,抑制炎性细胞因子表达;还可通过直接抑制诱导型一氧化氮合酶(iNOS)、环氧化酶-2(COX-2)、5-脂氧化酶(5-LO)的酶活性,阻滞炎症介质一氧化氮、前列腺素(PGs)、白三烯(LTs)的合成和释放,以及抑制组织胺释放等,产生广谱的抗炎作用。厚朴提取物、厚朴酚及和厚朴酚的抗氧化活性也是其抗炎作用的主要机制之一。厚朴为常用的非毒性中药,可以把研究重点放在防治慢性的或退行性疾病的微炎症方面。
