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- W2793871330 abstract "SUMMARY The specific cell architecture of prorocentroid dinoflagellates is reflected in the internal cell structure, particularly, in cytoskeleton organization. Cytoskeleton arrangement in a Prorocentrum minimum cell was investigated using fluorescent labeling approaches, electron‐microscopy and immunocytochemical methods. The absence of cortical microtubules was confirmed. Phalloidin – tetramethylrhodamine isothiocyanate conjugate staining demonstrated that F‐actin forms a dense layer in the cortical region of the cell; besides, it was detected in the ‘archoplasmic sphere’ adjacent to the nucleus. In some cells the rest of the cytoplasm and the nucleus were also slightly stained. In dividing cells, F‐actin was mainly distributed in the cortical region and in the cleavage furrow. Fluorescent deoxyribonuclease I staining demonstrated more evenly distributed cytoplasmic non‐polymerized actin; the basis of the nuclear actin pool is monomeric actin. It concentrates in the nucleoplasm and forms a meshwork around chromosomes. The significant amount of G‐actin is apparently localized in the P. minimum nucleolus. Assumed involvement of F‐actin in the process of stress‐induced ecdysis – cell cover shedding – was examined. A sharp decrease in the level of ecdysis was observed after treatment with actin‐depolymerizing agent latrunculin B. The fluorescent staining of treated cells demonstrated disturbance of the actin cytoskeleton and disappearance of the cortical F‐actin layer. Our results support the recent data on the actin involvement in fundamental nuclear processes: cytoplasmic F‐actin appears to participate in cell shape determination, cell cover rearrangement and development. Actin may play a substitute role in the absence of cortical microtubules, representing the cytoskeletal basis of P. minimum cell architecture." @default.
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- W2793871330 date "2018-03-08" @default.
- W2793871330 modified "2023-10-02" @default.
- W2793871330 title "Actin as a cytoskeletal basis for cell architecture and a protein essential for ecdysis in<i>Prorocentrum minimum</i>(Dinophyceae, Prorocentrales)" @default.
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- W2793871330 doi "https://doi.org/10.1111/pre.12214" @default.
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