A model of calcium signaling and degranulation dynamics induced by laser irradiation in mast cells

作     者：SHI XiaoMin ZHENG YuFan LIU ZengRong YANG WenZhong 

作者机构：Institute of Systems Science Shanghai University Shanghai 200444 China Institute of Systems Biology Shanghai University Shanghai 200444 China Department of Physics Fudan University Shanghai 200433 China 

出 版 物：《Chinese Science Bulletin》 (Chin. Sci. Bull.)

年 卷 期：2008年第53卷第15期

页      面：2315-2325页

核心收录：

学科分类：0710[理学-生物学] 07[理学] 071009[理学-细胞生物学] 09[农学] 0901[农学-作物学] 090102[农学-作物遗传育种] 

基　　金：the Science and Technology Commission of Shanghai Municipality (Grant No. 05DZ19747) Education Commission of Shanghai Municipality (Grant No. 05AZ58) Systems Biology Research Foundation of Shanghai University 

主　　题：激光 钙 肥大细胞 TRPV4渠道 动态模式 

摘      要：Recent experiments show that calcium signaling and degranulation dynamics induced by low power laser irradiation in mast cells must rely on extracellular Ca2+ influx. An analytical expression of Ca2+ flux through TRPV4 cation channel in response to interaction of laser photon energy and extracellular Ca2+ is deduced, and a model characterizing dynamics of calcium signaling and degranulation activated by laser irradiation in mast cells is established. The model indicates that the characteristics of calcium signaling and degranulation dynamics are determined by interaction between laser photon energy and Ca2+ influx. Extracellular Ca2+ concentration is so high that even small photon energy can activate mast cells, thus avoiding the possible injury caused by laser irradiation with shorter wavelengths. The model predicts that there exists a narrow parameter domain of photon energy and extracellular Ca2+ concen-tration of which results in cytosolic Ca2+ limit cycle oscillations, and shows that PKC activity is in direct proportion to the frequency of Ca2+ oscillations. With the model it is found that sustained and stable maximum plateau of cytosolic Ca2+ concentration can get optimal degranulation rate. Furthermore, the idea of introducing the realistic physical energy into model is applicable to modeling other physical signal transduction systems.