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pepsinogen. a zymogen secreted by the chief cells of the gastric glands and converted into pepsin in the presence of gastric acid or of pepsin itself.plasma pepsinogen. high levels are indicative of extensive mucosal damage in the abomasum, as in ostertagiasis in ruminants. proenzyme formed and secreted by the chief cells of the gastric mucosa; the acidity of the gastric juice and pepsin itself remove 42 amino acid residues from pepsinogen to form active pepsin. Synonym(s): propepsin. [ pepsin + G. -gen, producing].
For instance, digestive enzymes which hydrolyze proteins are made as zymogens in the stomach and pancreas, in which pepsinogen is the inactive precursor (zymogen) and pepsin is the activated form of the enzyme. Another example is seen in blood clotting which is carried out by a cascade of proteolytic activations.ommon uses in Biological Systems [edit]. Digestive enzymes are activated in the stomach and pancreas using this methodology. They are synthesized first as zymogens. Pepsinogen is the inactive protein which is initially transcribed.