| ACE-like hydrolysis of gastrin analogs and CCK-8 by fundic mucosal cells of different species with release of the amidated C-terminal dipeptide. | |
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MedLine Citation:
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PMID: 2163679 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Various gastrin analogues and CCK-8 (Asp-Tyr(SO3H)-Met-Gly-Trp-Met-Asp-Phe-NH2) are hydrolyzed in vitro by angiotensin-converting enzyme (ACE), the main and initial cleavage occurring at the Met-Asp (or Leu-Asp) bond, releasing the C-terminal dipeptide amide Asp-Phe-NH2. Tetragastrin analogues (e.g., Boc-Trp-Leu-Asp-Phe-NH2) are degraded by a vesicular membrane fraction from rat gastric mucosa, yielding the C-terminal dipeptide Asp-Phe-NH2. We report here on the degradation of gastrin analogues and CCK-8 by a gastric mucosal cell preparation containing specific gastrin receptors. We have shown that gastrin analogues were specifically degraded by gastric mucosal cells from different species (e.g., rabbit and dog) at 37 degrees C (pH 7.4), releasing the C-terminal dipeptide Asp-Phe-NH2, similarly to ACE. This cleavage was found to be temperature and pH sensitive, and was inhibited by metalloproteinase inhibitors and by captopril, strongly suggesting that this enzymatic system closely resembles ACE. We have also demonstrated that a close correlation seems to exist between the apparent affinity of the gastrin analogues for gastrin receptors on gastric mucosal cells, and their ability of being hydrolyzed by this cell preparation. Moreover, all gastrin analogues which have been demonstrated to act as gastrin antagonists remained unaffected in the incubation conditions. |
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Authors:
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P Dubreuil; P Fulcrand; M Rodriguez; J Laur; J P Bali; J Martinez |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: Biochimica et biophysica acta Volume: 1039 ISSN: 0006-3002 ISO Abbreviation: Biochim. Biophys. Acta Publication Date: 1990 Jun |
Date Detail:
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Created Date: 1990-08-13 Completed Date: 1990-08-13 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0217513 Medline TA: Biochim Biophys Acta Country: NETHERLANDS |
Other Details:
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Languages: eng Pagination: 171-6 Citation Subset: IM |
Affiliation:
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Centre CNRS-INSERM de Pharmacologie-Endocrinologie, Montpellier, France. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Amides
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metabolism Amino Acid Sequence Animals Cells, Cultured Dipeptides / isolation & purification, metabolism Dogs Gastric Fundus Gastric Mucosa / metabolism* Gastrins / metabolism* Hydrolysis Kinetics Molecular Sequence Data Peptidyl-Dipeptidase A / metabolism* Rabbits Sincalide / metabolism* Species Specificity Substrate Specificity |
| Chemical | |
Reg. No./Substance:
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0/Amides; 0/Dipeptides; 0/Gastrins; 25126-32-3/Sincalide; EC 3.4.15.1/Peptidyl-Dipeptidase A |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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