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Co-distribution of calmodulin-dependent protein kinase II and inositol trisphosphate receptors in an apical domain of gastrointestinal mucosal cells

LM Matovcik, AR Maranto, CJ Soroka, FS Gorelick, J Smith and JR Goldenring

Department of Surgery, Yale University School of Medicine, West Haven VA Medical Center, New Haven, Connecticut, USA.

The Type 3 inositol 1,4,5-trisphosphate (InsP3) receptor is expressed at high levels in gastrointestinal tissues. This receptor has 16 potential phosphorylation sites for calcium/calmodulin-dependent protein kinase II (CaM kinase II). To determine if the Type 3 InsP3 receptor is likely to be a physiologic substrate for CaM kinase II, localizations of the Type 3 InsP3 receptor and CaM kinase II were compared in tissues of the gastrointestinal tract. Cellular and subcellular localizations were determined by immunofluorescence microscopy in rat intestine, pancreas, and stomach, and in isolated rabbit gastric glands. Both proteins were found in the apical region of intestinal enterocytes, pancreatic acinar cells, and gastric parietal, chief, and surface mucous cells. CaM kinase II was found throughout the entire intracellular canalicular F-actin domain of parietal cells, whereas the type 3 InsP3 receptor was restricted to the neck region. Thus, in several gastrointestinal tissues the Type 3 InsP3 receptor is specifically localized to a portion of the apical cytoskeletal domain in which resides the calcium-responsive effector CaM kinase II.

Volume 44, Issue 11, pp. 1243-1250, 11/01/1996
Copyright © 1996 by The Histochemical Society


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