Summary
Antidiuretic hormone (ADH) increases the apical (external facing) membrane water permeability of granular cells that line the toad urinary bladder. In response to ADH, cytoplasmic vesicles called aggrephores fuse with the apical plasma membrane and insert particle aggregates which are visualized by freeze-fracture electron microscopy. Aggrephores contain particle aggregates within their limiting membranes. It is generally accepted that particle aggregates are or are related to water channels. High rates of transepithelial water flow during ADH stimulation and subsequent hormone removal decrease water permeability and cause the endocytosis of apical membrane and aggrephores which retrieve particle aggregates. We loaded the particle aggregate-rich endocytic vesicles with horseradish peroxidase (HRP) during ADH stimulation and removal. Epithelial cells were isolated and homogenized, and a subcellular fraction was enriched for sequestered HRP obtained. The HRP-enriched membrane fraction was subjected to a density shifting maneuver (Courtoy et al.,J. Cell Biol. 98:870, 1984), which yielded a purified membrane fraction containing vesicles with entrapped HRP. The density shifted vesicles were composed of approximately 20 proteins including prominent species of 55, 17 and 7 kD. Proteins of these molecular weights appear on the apical surface of ADH-stimulated bladders, but not the apical surface of control bladders. Therefore, we believe these density shifted vesicles contain proteins involved in the ADH-stimulated water permeability response, possibly components of particle aggregates and/or water channels.
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Harris, H.W., Murphy, H.R., Willingham, M.C. et al. Isolation and characterization of specialized regions of toad urinary bladder apical plasma membrane involved in the water permeability response to antidiuretic hormone. J. Membrain Biol. 96, 175–186 (1987). https://doi.org/10.1007/BF01869243
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DOI: https://doi.org/10.1007/BF01869243