[Leu15]-Gastrin I human 基因编码人体内的蛋白质 [Leu15]-胃泌素 I。在人类染色体中，GAST 基因定位于 17q21.2。胃窦中的 G 细胞产生 [Leu15]-胃泌素 I 的前体前胃泌素。前胃泌素经过裂解和加工产生胃泌素，它对整个胃肠道上皮细胞具有营养作用。胃泌素对消化系统的生长至关重要，并刺激壁细胞产生胃酸。胃泌素通过称为胆囊收缩素 (CCK) 或 CCK-B 受体 (CCK-BR) 的 G 蛋白偶联受体发挥其功能。胃泌素的释放受到食物的刺激，尤其是蛋白质饮食，并受到非常低的 pH 值的抑制。萎缩性胃炎、幽门螺杆菌感染和长期服用质子泵抑制剂感染可能导致胃泌素过度表达。胃腺癌显示高水平的胃泌素。

GAST gene encodes for the protein [Leu15]-Gastrin I in human. In human chromosome, the gene GAST is localized on 17q21.2. G cells in the stomach antrum produces the precursor of [Leu15]-Gastrin I, progastrin.Progastrin undergoes cleavage and processing to yield gastrin, which is trophic for the entire gastrointestinal epithelium. Gastrin is essential for the growth of the digestive system and stimulates the production of gastric acid by parietal cells. Gastrin exerts its function through G-protein-coupled receptor called the cholecystokinin (CCK) or CCK-B receptor (CCK-BR). Gastrin release is stimulated by food, especially protein diet and is inhibited by very low pH. Atrophic gastritis, a Helicobacter pylori infection and long-term administration of proton pump inhibitors infection may cause overexpression of gastrin. Gastric adenocarcinoma show high levels of gastrin.

39024-57-2

C98H126N20O31

2080.195

Amino Acid Sequence Glp-Gly-Pro-Trp-Leu-Glu-Glu-Glu-Glu-Glu-Ala-Tyr-Gly-Trp-Leu-Asp-Phe-NH2;[Leu15]-Gastrin I human

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