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The pepsins from human gastric mucosal extracts
The Biochemical Journal
|July 1, 1970
Summary
This study characterized gastric pepsins and pepsinogens in normal subjects and patients with gastric adenocarcinoma or duodenal ulcers. Four distinct pepsins were identified in fundic mucosa, with variations observed in pyloric mucosa and disease states.
Area of Science:
- Gastroenterology
- Enzymology
- Molecular Biology
Background:
- Pepsin and pepsinogen are key gastric enzymes involved in protein digestion.
- Understanding their heterogeneity is crucial for diagnosing and treating gastric conditions.
Purpose of the Study:
- To investigate the heterogeneity of pepsins and pepsinogens in gastric mucosal extracts.
- To compare enzyme profiles in normal subjects, gastric adenocarcinoma, and duodenal ulcer patients.
Main Methods:
- Agar-gel electrophoresis and ion-exchange chromatography were used to analyze gastric mucosal extracts.
- Proteolytic activity zones were identified and characterized.
Main Results:
- Seven of eight previously reported gastric juice proteolytic zones were detected in fundic mucosal extracts.
- Four discrete pepsins (1, 3a, 3, and 5) were identified, along with alkali-stable gastric proteinases (Zone 7).
- Pepsin 3 exhibited multiple precursors, while pepsins 1 and 5 had single precursors; pyloric pepsin 5 differed from its fundic counterpart.
Conclusions:
- Fundic mucosa contains a diverse range of pepsins and related enzymes.
- Pepsin heterogeneity may be relevant in gastric diseases.
- Pyloric mucosa possesses a distinct pepsin profile compared to the fundus.