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The syndrome is caused by a gastrinoma, a neuroendocrine tumor that secretes a hormone called gastrin. [2] Too much gastrin in the blood (hypergastrinemia) results in the overproduction of gastric acid by parietal cells in the stomach. Gastrinomas most commonly arise in the duodenum, pancreas or stomach.
Gastrin is a linear peptide hormone produced by G cells of the duodenum and in the pyloric antrum of the stomach.It is secreted into the bloodstream. The encoded polypeptide is preprogastrin, which is cleaved by enzymes in posttranslational modification to produce progastrin (an intermediate, inactive precursor) and then gastrin in various forms, primarily the following three:
The gastrointestinal hormones [3] can be divided into three main groups based upon their chemical structure. Gastrin–cholecystokinin family: gastrin and cholecystokinin; Secretin family: secretin, glucagon, vasoactive intestinal peptide and gastric inhibitory peptide; Somatostatin family; Motilin family; Substance P.
Secretin, which is a hormone released from the duodenal S cells that induces the release of pancreatic bicarbonate (HCO 3) that would neutralize the acidic environment due to high gastrin levels. Therefore, if the patient's level of gastrin remains consistently high indicating gastrin release due to tumor such as gastrinoma. [17]
In 1905, John Sydney Edkins demonstrated the existence of a hormone responsible for the secretion of gastric acid. [4] This hormone was named gastric secretin or gastrin. But it was not until 1979 and later in 1987 and 1988 that progastrin was identified as the precursor to gastrin. [5] [6] [7] His protein sequence and mRNA were revealed.
A G cell or gastrin cell is a type of cell in the stomach and duodenum that secretes gastrin. It works in conjunction with gastric chief cells and parietal cells. G cells are found deep within the pyloric glands of the stomach antrum, and occasionally in the pancreas [1] and duodenum. The vagus nerve innervates the G cells.
Zollinger-Ellison syndrome is a collection of findings in individuals with gastrinoma, a tumor of the gastrin-producing cells of the pancreas. Unbridled gastrin secretion results in elevated levels of the hormone, and increased hydrochloric acid secretion from parietal cells of the stomach. It can lead to ulceration and scarring of the stomach ...
Gastrin-releasing peptide GRP, is a neuropeptide, a regulatory molecule encoded in the human by the GRP gene. GRP has been implicated in a number of physiological and pathophysiological processes. Most notably, GRP stimulates the release of gastrin from the G cells of the stomach. GRP encodes a number of bombesin-like peptides.