LOCALIZATION OF CA++-ACTIVATED ADENOSINE TRIPHOSPHATASE ACTIVITIES TN THE TRANSITIONAL EPITHELIUM OF THE RABBIT URINARY BLADDER
作者： HARUMICHI SEGUCHI , TERUHIKO OKADA , KAZUO OGAWA
DOI: 10.1267/AHC.15.76
关键词: Biochemistry 、 Protein filament 、 Adenosine triphosphatase 、 Biophysics 、 Cell shape 、 Biology 、 Contraction (grammar) 、 Urinary bladder 、 Transitional epithelium 、 Actin
摘要: The localization of Ca++-activated adenosine triphosphatase (Ca++-ATP-ase) activity was studied ultracytochemically in the transitional epithelium rabbit urinary bladder. superficial cells contained two types filaments, measuring 4-5nm and 6-10nm diameter respectively. former filaments are considered to correspond actin filament, but latter seem be composed a little thinner, around 7nm, thicker, 10nm, filaments. thicker ones located predominantly vicinity desmosomes inserted into them tonofilaments. dense globular particles reaction products showing Ca++-ATPase were observed filament-rich field. These lay superimposed on or immediately lateral them. Tonofilaments were, however, not positive for activity.These results suggest that probably 7nm also, 10nm tonofilaments, contractile proteins. deposits may site cross-bridge contraction system. Functionally these might serve change cell shape during contraction-distension cycles
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