10.1248/cpb.38.971
This study investigated the effects of ten 10-phenyl-[11]cytochalasins produced by Phomopsis sp., including novel compounds with 5,7- or 6,7-diol structures and their derivatives, such as epoxycytochalasin H, cytochalasin H, cytochalasin J, cytochalasin N, cytochalasin O, and cytochalasin P, on cell structure and actin polymerization. Their effects on cell morphology, actin distribution in C3H-2K cells, lymphocyte capping, and actin polymerization were also investigated. The results confirmed previously reported structure-activity relationships, indicating that the perhydroisoindol-1-one core is essential for the effects of cytochalasins. The novel diol-type compounds showed little or no activity. The effects of five derivatives were also investigated to elucidate the influence of the physical properties of the compounds, such as lipophilicity, on their effectiveness. These findings provide insights into the structure-activity relationships of cytochalasins and their potential cellular and actin-related effects.