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- W257972093 abstract "The rabbit gastric parietal cell is an excellent model for the study of regulation of secretion and the role of cytoskeleton in secretion. Changes in morphology (appearance of expanded secretory canaliculi lined with microvilli) accompany H/sup +/ secretion stimulated by histamine (cAMP mediated). Parietal cells contain immunoreactive tubulin and are highly enriched in F-actin at secretory canaliculi, detected with fluorescently labelled phallacidin. They have previously shown increased protein phosphorylation in histamine-stimulated purified parietal cells concommitant with increases in H/sup +/ secretion. They report here possible functions of the phosphoproteins. Four of these proteins of apparent size on SDS PAGE of 24, 30, 48 and 130 Kd were membrane associated. /sup 125/I-actin binding to three proteins (24, 30 and 48 Kd) was shown using overlays. A 130 Kd protein reacted with anti-vinculin monoclonal antibody on immunoblots, and was immunolocalized at secretory canaliculi. As a working hypothesis, parietal cells possess membrane-associated proteins which change their state of phosphorylation upon stimulation of H/sup +/. These proteins may be cytoskeletal elements involved in regulation of H/sup +/ secretion. The 130 Kd vinculin-like protein may serve a microfilament-membrane linking role." @default.
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- W257972093 date "1986-05-01" @default.
- W257972093 modified "2023-09-25" @default.
- W257972093 title "Cytoskeletal proteins in gastric H/sup +/ secretion: cAMP dependent phosphorylation, immunolocalization, and protein blotting" @default.
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