Stimulation of Gastric Mucosal Protein Synthesis by Different Molecular Forms of Gastrin

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Abstract
Protein synthesis in gastric mucosa was studied by measuring the incorporation of labeled amino acids into protein by isolated gastric mucosal ribosomes in a cell-free system. In 48-hour fasted rats, administration of the synthetic analogues pentagastrin, tetragastrin and gastrin-17 or naturally occurring molecular forms of human gastrin (G-14, G-34) markedly enhanced (23-123%) the capacity of the gastric mucosal ribosomes to synthesize endogenous mRNA-directed protein in a cell-free system. In the presence of exogenous mRNA (poly-U), the gastric mucosal ribosomes from the saline-treated controls showed a higher poly(U)-directed protein synthesis, compared to each of the gastrin-treated groups. The protein/polyphenylalanine ratio which represents a ratio of polysomes to monosomes was found increased in ribosomes from the gastrin-treated groups.