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- W2023204927 endingPage "973" @default.
- W2023204927 startingPage "965" @default.
- W2023204927 abstract "The objective of this study was to localize rap1 in the rat parotid gland. Rap1 is a small GTP-binding protein that has been linked to phagocytosis in neutrophils and various functions in platelets. In this study, we used [α- 32 P]-GTP-blot overlay analysis, immunoblot analysis, and immunohistochemistry to identify rap1 in rat parotid gland. The immunohistochemical techniques included immunoperoxidase and widefield microscopy with image deconvolution. Rap1 was identified in the secretory granule membrane (SGM), plasma membrane (PM), and cytosolic (CY) fractions, with the largest signal being in the SGM fraction. The tightly bound vs loosely adherent nature of SGM-associated rap1 was determined using sodium carbonate, and its orientation on whole granules was assessed by trypsin digestion. Rap1 was found to be a tightly bound protein rather than a loosely adherent contaminant protein of the SGM. Its orientation on the cytosolic face of the secretory granule (SG) is of significance in postulating a function for rap1 because exocytosis involves the fusion of the cytoplasmic face of the SG with the cytoplasmic face of the PM, with subsequent release of granule contents (CO). Therefore, the localization and high concentration of rap1 on the SGM and its cytosolic orientation suggest that it may play a role in the regulation of secretion." @default.
- W2023204927 created "2016-06-24" @default.
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- W2023204927 date "1997-07-01" @default.
- W2023204927 modified "2023-10-11" @default.
- W2023204927 title "Immunolocalization of Rap1 in the Rat Parotid Gland: Detection on Secretory Granule Membranes" @default.
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- W2023204927 doi "https://doi.org/10.1177/002215549704500706" @default.
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