Receptors for Escherichia coli heat stable enterotoxin in human intestine and in a human intestinal cell line (Caco-2). 1993

M B Cohen, and N J Jensen, and J A Hawkins, and E A Mann, and M R Thompson, and M J Lentze, and R A Giannella
Division of Pediatric Gastroenterology and Nutrition, Children's Hospital Medical Center, Cincinnati, Ohio 45229.

Escherichia coli heat stable enterotoxin (STa) and the newly identified endogenous ligand guanylin bind to an intestinal receptor and activate membrane bound guanylate cyclase. We compared STa binding and affinity crosslinking of STa receptors in human small intestine to those in the Caco-2 human colon carcinoma cell line. STa had similar kinetics of binding in human intestinal and Caco-2 brush border membranes. In both human intestine and Caco-2 brush border membranes, multiple specifically radiolabeled bands, including a 140-165 kDa band, were identified by affinity crosslinking. However, in human intestine the most prominent autoradiographic species was a 60 kDa band. A 60 kDa protein was also specifically immunoprecipitated from solubilized human brush border membranes using antisera raised against a cloned STa receptor fusion protein. Our observations of multiple crosslinked proteins in human intestine and Caco-2 cells could be explained by the existence of several members of a family of STa receptors and/or the existence of smaller STa binding proteins generated by the protease cleavage of a larger complete STa receptor.

UI MeSH Term Description Entries
D007413 Intestinal Mucosa Lining of the INTESTINES, consisting of an inner EPITHELIUM, a middle LAMINA PROPRIA, and an outer MUSCULARIS MUCOSAE. In the SMALL INTESTINE, the mucosa is characterized by a series of folds and abundance of absorptive cells (ENTEROCYTES) with MICROVILLI. Intestinal Epithelium,Intestinal Glands,Epithelium, Intestinal,Gland, Intestinal,Glands, Intestinal,Intestinal Gland,Mucosa, Intestinal
D011956 Receptors, Cell Surface Cell surface proteins that bind signalling molecules external to the cell with high affinity and convert this extracellular event into one or more intracellular signals that alter the behavior of the target cell (From Alberts, Molecular Biology of the Cell, 2nd ed, pp693-5). Cell surface receptors, unlike enzymes, do not chemically alter their ligands. Cell Surface Receptor,Cell Surface Receptors,Hormone Receptors, Cell Surface,Receptors, Endogenous Substances,Cell Surface Hormone Receptors,Endogenous Substances Receptors,Receptor, Cell Surface,Surface Receptor, Cell
D004768 Enterotoxins Substances that are toxic to the intestinal tract causing vomiting, diarrhea, etc.; most common enterotoxins are produced by bacteria. Staphylococcal Enterotoxin,Enterotoxin,Staphylococcal Enterotoxins,Enterotoxin, Staphylococcal,Enterotoxins, Staphylococcal
D004926 Escherichia coli A species of gram-negative, facultatively anaerobic, rod-shaped bacteria (GRAM-NEGATIVE FACULTATIVELY ANAEROBIC RODS) commonly found in the lower part of the intestine of warm-blooded animals. It is usually nonpathogenic, but some strains are known to produce DIARRHEA and pyogenic infections. Pathogenic strains (virotypes) are classified by their specific pathogenic mechanisms such as toxins (ENTEROTOXIGENIC ESCHERICHIA COLI), etc. Alkalescens-Dispar Group,Bacillus coli,Bacterium coli,Bacterium coli commune,Diffusely Adherent Escherichia coli,E coli,EAggEC,Enteroaggregative Escherichia coli,Enterococcus coli,Diffusely Adherent E. coli,Enteroaggregative E. coli,Enteroinvasive E. coli,Enteroinvasive Escherichia coli
D006162 Guanylate Cyclase An enzyme that catalyzes the conversion of GTP to 3',5'-cyclic GMP and pyrophosphate. It also acts on ITP and dGTP. (From Enzyme Nomenclature, 1992) EC 4.6.1.2. Guanyl Cyclase,Deoxyguanylate Cyclase,Guanylyl Cyclase,Inosinate Cyclase,Cyclase, Deoxyguanylate,Cyclase, Guanyl,Cyclase, Guanylate,Cyclase, Guanylyl,Cyclase, Inosinate
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000074261 Receptors, Enterotoxin Guanylate cyclase-coupled receptors that bind bacterial ENTEROTOXINS, as well as the endogenous peptides guanylin and uroguanylin. Ligand binding stimulates production of CYCLIC GMP by EPITHELIAL CELLS of the intestinal lumen, altering barrier permeability and mucus secretion. Mutations in the gene (GUCY2C) encoding this receptor are associated with some cases of hereditary diarrhea (Diarrhea 6) and MECONIUM ILEUS. Enterotoxin Receptor,Enterotoxin Receptors,Enterotoxin-Guanylin Receptor,Enterotoxin-Guanylin Receptors,GC-C Receptor,GC-C Receptors,Guanyl Cyclase-C Receptor,Guanyl Cyclase-C Receptors,Guanylin-Uroguanylin Receptor,Guanylin-Uroguanylin Receptors,Guanylyl Cyclase C,Heat-Stable Enterotoxin Receptor,Heat-Stable Enterotoxin Receptors,Receptor, Enterotoxin,Receptor, Guanyl Cyclase-C,Receptors, Guanyl Cyclase-C,Cyclase C, Guanylyl,Cyclase-C Receptors, Guanyl,Enterotoxin Guanylin Receptor,Enterotoxin Guanylin Receptors,Enterotoxin Receptor, Heat-Stable,Enterotoxin Receptors, Heat-Stable,GC C Receptor,GC C Receptors,Guanyl Cyclase C Receptor,Guanyl Cyclase C Receptors,Guanylin Uroguanylin Receptor,Guanylin Uroguanylin Receptors,Heat Stable Enterotoxin Receptor,Heat Stable Enterotoxin Receptors,Receptor, Enterotoxin-Guanylin,Receptor, GC-C,Receptor, Guanyl Cyclase C,Receptor, Guanylin-Uroguanylin,Receptor, Heat-Stable Enterotoxin,Receptors, Enterotoxin-Guanylin,Receptors, GC-C,Receptors, Guanyl Cyclase C,Receptors, Guanylin-Uroguanylin,Receptors, Heat-Stable Enterotoxin
D001427 Bacterial Toxins Toxic substances formed in or elaborated by bacteria; they are usually proteins with high molecular weight and antigenicity; some are used as antibiotics and some to skin test for the presence of or susceptibility to certain diseases. Bacterial Toxin,Toxins, Bacterial,Toxin, Bacterial
D014407 Tumor Cells, Cultured Cells grown in vitro from neoplastic tissue. If they can be established as a TUMOR CELL LINE, they can be propagated in cell culture indefinitely. Cultured Tumor Cells,Neoplastic Cells, Cultured,Cultured Neoplastic Cells,Cell, Cultured Neoplastic,Cell, Cultured Tumor,Cells, Cultured Neoplastic,Cells, Cultured Tumor,Cultured Neoplastic Cell,Cultured Tumor Cell,Neoplastic Cell, Cultured,Tumor Cell, Cultured
D050705 Receptors, Guanylate Cyclase-Coupled A class of cellular membrane receptors that either have an intrinsic guanylate cyclase activity or are closely coupled to specific guanylate cyclases within the cell. Guanylate Cyclase-Coupled Receptors,Guanylyl Cyclase Receptor,Guanylyl Cyclase Receptors,Guanylyl Cyclase-Linked Receptors,Cyclase Receptor, Guanylyl,Cyclase Receptors, Guanylyl,Cyclase-Coupled Receptors, Guanylate,Cyclase-Linked Receptors, Guanylyl,Guanylate Cyclase Coupled Receptors,Guanylyl Cyclase Linked Receptors,Receptor, Guanylyl Cyclase,Receptors, Guanylate Cyclase Coupled,Receptors, Guanylyl Cyclase,Receptors, Guanylyl Cyclase-Linked

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