Background Little is known about basophil with respect to the different signaling transduction pathways involved in spontaneous, cytokine or anti-IgE induced adhesion and how this compares to IgE-dependent and IgE-ind...Background Little is known about basophil with respect to the different signaling transduction pathways involved in spontaneous, cytokine or anti-IgE induced adhesion and how this compares to IgE-dependent and IgE-independent mediator secretion. The purpose of the present study was to investigate the roles of β1 and β2 integrins in basophil adhesion as well as hosphatidylinositol 3-kinase （PI3K）, src-kinases and extracellular signal regulated kinase （ERK）1/2 in basophil adhesion and histamine release （HR）. Methods Basophils （purity of 10%-50%） were preincubated with anti-CD29 or anti-CD 18 blocking antibodies before used for adhesion study. Basophils were preincubated with the pharmacological inhibitors wortmannin, PP1, PD98059 before used for adhesion and HR study. Cell adherence to bovine serum albumin （BSA） or fibronectin （Fn） was monitored using cell associated histamine as a basophil marker and the histamine was measured by the glass fiber assay. Results Basophil spontaneous adhesion to Fn was inhibited by anti-CD29. Interleukin （IL）-3, granulocyte/macrophage colony stimulating factor （GM-CSF） induced adhesion to BSA was inhibited by anti-CD18. Wortmannin at 1 μmol/L and PP1 at 20 μmol/L strongly interfered with, whereas PD98059 at 50μmol/L weakly inhibited basophil spontaneous adhesion to Fn. One μmol/L wortmannin strongly inhibited IL-3, IL-5, GM-CSF and anti-IgE induced adhesion to BSA. PP1 at 20 μmol/L partly inhibited anti-IgE induced adhesion. Fifty μmol/L PD98059 marginally inhibited IL-5, weakly inhibited anti-IgE, partly inhibited GM-CSF induced adhesion. Wortmannin, PP1 and PD98059 inhibited anti-IgE （1：100 or 1：1000） induced basophil HR in a dose dependent manner. They inhibited calcium ionophore A23187 （10 μmol/L, 5 μmol/L） induced basophil HR in a dose dependent manner, but to different extend with PP1 being the most efficient. Conclusions Basophil spontaneous adhesion to Fn is mediated by β 1-integrins whereas cytokine induced adhesion to BSA is mediated by β 2-integrins. PI3K, src-kinases and ERK1/2 play distinct signaling roles in basophil adhesion and HR. PI3K is the key player while ERK1/2 is the weakest participant.展开更多
Objective: To observe the blocking effect of Huoxiang Zhengqi liqu id (HXZQL) on histamine release of basophils. Methods: The study was conducted using HXZQL to neutralize and b lock IgE and antagonize the effect of I...Objective: To observe the blocking effect of Huoxiang Zhengqi liqu id (HXZQL) on histamine release of basophils. Methods: The study was conducted using HXZQL to neutralize and b lock IgE and antagonize the effect of IL 3 induced enhancing histamine relea se of bosaphils. Concentration and percentage of histamine release of bosaphils were tested by the basophil histamine release test. Results: The HXZQL drug serum had obvious inhibitive effect on degranulation of bosaphils induced by IgE antigen antibody complex ( P <0.0 5) and can successfully weaken the histamine release of basophils stimulated by IL 3. When compared with those in the untreated group, it showed P <0.01. Conclusion: HXZQL drug serum may neutralize and block IgE and has inhibitive effects on degranulation of cells when resensitized by antigens. It can also block allergic response type Ⅰ by antagonizing the effect of IL 3 induced enhancing histamine release.展开更多
基金this study was supported by grants from the Danish Allergy Research Center, the Foundation for the Excellent Young Scientist of Anhui Province (No. 04043053) and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry.
文摘Background Little is known about basophil with respect to the different signaling transduction pathways involved in spontaneous, cytokine or anti-IgE induced adhesion and how this compares to IgE-dependent and IgE-independent mediator secretion. The purpose of the present study was to investigate the roles of β1 and β2 integrins in basophil adhesion as well as hosphatidylinositol 3-kinase （PI3K）, src-kinases and extracellular signal regulated kinase （ERK）1/2 in basophil adhesion and histamine release （HR）. Methods Basophils （purity of 10%-50%） were preincubated with anti-CD29 or anti-CD 18 blocking antibodies before used for adhesion study. Basophils were preincubated with the pharmacological inhibitors wortmannin, PP1, PD98059 before used for adhesion and HR study. Cell adherence to bovine serum albumin （BSA） or fibronectin （Fn） was monitored using cell associated histamine as a basophil marker and the histamine was measured by the glass fiber assay. Results Basophil spontaneous adhesion to Fn was inhibited by anti-CD29. Interleukin （IL）-3, granulocyte/macrophage colony stimulating factor （GM-CSF） induced adhesion to BSA was inhibited by anti-CD18. Wortmannin at 1 μmol/L and PP1 at 20 μmol/L strongly interfered with, whereas PD98059 at 50μmol/L weakly inhibited basophil spontaneous adhesion to Fn. One μmol/L wortmannin strongly inhibited IL-3, IL-5, GM-CSF and anti-IgE induced adhesion to BSA. PP1 at 20 μmol/L partly inhibited anti-IgE induced adhesion. Fifty μmol/L PD98059 marginally inhibited IL-5, weakly inhibited anti-IgE, partly inhibited GM-CSF induced adhesion. Wortmannin, PP1 and PD98059 inhibited anti-IgE （1：100 or 1：1000） induced basophil HR in a dose dependent manner. They inhibited calcium ionophore A23187 （10 μmol/L, 5 μmol/L） induced basophil HR in a dose dependent manner, but to different extend with PP1 being the most efficient. Conclusions Basophil spontaneous adhesion to Fn is mediated by β 1-integrins whereas cytokine induced adhesion to BSA is mediated by β 2-integrins. PI3K, src-kinases and ERK1/2 play distinct signaling roles in basophil adhesion and HR. PI3K is the key player while ERK1/2 is the weakest participant.
基金The item is subsidized by Natural Science Fund of Fujian Province (No. C96044)
文摘Objective: To observe the blocking effect of Huoxiang Zhengqi liqu id (HXZQL) on histamine release of basophils. Methods: The study was conducted using HXZQL to neutralize and b lock IgE and antagonize the effect of IL 3 induced enhancing histamine relea se of bosaphils. Concentration and percentage of histamine release of bosaphils were tested by the basophil histamine release test. Results: The HXZQL drug serum had obvious inhibitive effect on degranulation of bosaphils induced by IgE antigen antibody complex ( P <0.0 5) and can successfully weaken the histamine release of basophils stimulated by IL 3. When compared with those in the untreated group, it showed P <0.01. Conclusion: HXZQL drug serum may neutralize and block IgE and has inhibitive effects on degranulation of cells when resensitized by antigens. It can also block allergic response type Ⅰ by antagonizing the effect of IL 3 induced enhancing histamine release.
