[Structural rearrangements of microfilaments and granular cells of the frog bladder during induction of water transport: fluorescent microscopic, immunocytochemical and electron microscopic studies].

The structural reorganization of actin cytoskeleton of the frog urinary bladder granular cells, in the process of vasopressin-induced water transport, was studied by fluorescent and electron microscopy, and immunocytochemistry. A significant decrease in density of actin microfilament network under the apical membrane was observed after water transport stimulation. Microfilaments were associated with membranes of large vacuoles emerging in granular cells of vasopressin-treated urinary bladders. A supposition is advanced concerning functional heterogeneity of actin filaments in granular cells.