L V Riabova

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We studied the distribution of two actin-binding proteins, alpha-actinin and vinculin, in the oocytes and eggs of Xenopus laevis. These proteins are localized in the cortical area. A morphological connection of vinculin with the mirofilaments and plasma membrane was shown; the actin matrix in the egg was gold-labeled more intensely than in the oocyte. A(More)
Thymosine, a thymus hormone, restores the thymectomy induced deterioration of the routine pathways of migration and differentiation ofhemopoietic stem cells in mice. Administration of thymosine together with bone marrow cells from thymectomized mice to irradiated recipients also restores the level of migration and differentiation of hemopoietic stem cells.(More)
Using immunoblotting and immunofluorescent microscopy, we showed the presence in Xenopus laevis oocytes of two prosomal proteins (27 and 31-33 kDa) and studied their distribution during oogenesis. In the ooplasm, both proteins are detected in prosomal clusters of various size. During previtellogenesis, prosomal proteins are diffusely distributed in the(More)
It is proposed to consider certain states of the cortical actin cytoskeleton corresponding to various stages of oocyte maturation as morphological criteria of the cortical contractility during progesterone-induced oocyte maturation. In the definitive oocyte, the cortical microfilaments form an anisotropic network, while in the mature egg, they form an(More)
Ultrastructure of oocyte and egg cortical layer isolated in media containing various ions has been studied. The following results were obtained: 1) in cortical layer a two-component cytoskeletal system is present; morphology of this system changes during development; 2) cytoskeleton of the egg cortex acts as a two-component system in response to the(More)
Microfilaments were shown to be involved in maintaining spatial organization of the Xenopus laevis oocyte by using injections of DNAse I, which selectively destroys F-actin. An original method has been proposed for visualization of polymerized actin at the electron microscope level. Standard histological sections (5-6 um) were deparaffinized, treated with(More)