• 作者： 方力行；王志騰；林谷霖
• 中文摘要： The subcellular mechanism of how zooxanthellae leave the host cell of Acropora grandis under elevated temperature was investigated by using colchicine or cytochalasin D to deteriorate the action of microtubule and microfilament, respectively, N-ethylmaleimide to inhibit the activity of cytoplasmic myosin and dynein, and N-(6-aminohexyl)-5-chloro-1-naphthalene sulfoamide to antagonize calmodulin. The sensitivity of coral cell and zooxanthellae to rising temperature was also examined indirectly by studying the occurrence of the heat-shock protein 35 kDa in them. The results showed that coral cells synthesized the heat shock protein at a lower temperature than zooxanthellae did, suggesting it could be more sensitive to heat and could trigger the algae releasing process. Immunofluorescence staining of microtubules revealed that when the cytoskeleton network was disrupted by colchicine, the release of algae was also inhibited. The combination analysis of these drug interference indicated that the zooxanthellae had to be transported within cells via the cytoskeleton network by motor proteins, followed by host cell breakage to complete the release process. All this information about the subcellular mechanism of the release of zooxanthellae revealed that exocytosis of the host cell is an important mechanism of coral bleaching under mild environmental stress.
• 英文摘要： --
• 中文關鍵字： coral bleaching, heat-shock protein, exocytosis, immunofluorescence staining, microtubules, cytoskeleton network
• 英文關鍵字： --