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Gastrin-histamine interactions: direct and paracrine elements
C N Chuang1, M C Chen, A H Soll
1Center for Ulcer Research and Education, VA Wadsworth Hospital Center, Los Angeles, CA 90073.
Abstract:
The receptors mediating the physiologic actions of gastrin on acid secretion and growth have thus far not been localized to specific cells or fully characterized. Studies in canine fundic mucosa indicate that gastrin receptors are present on several cell types, including parietal cells and somatostatin cells. There is also increasing evidence for a gastrin-inducible pool of histamine in the fundic mucosa which is presumably stored in histamine-enterochromaffin-like cells. From the vantage point of studies in the canine fundic mucosa, the issue is no longer which cell type has the gastrin receptor but to sort out the mechanisms by which the effects of the gastrin receptors on endocrine/paracrine (histamine and somatostatin) cells and exocrine (parietal) cells are integrated to regulate secretory function and mucosal growth and differentiation.
Insights
Gastrin receptors are found on multiple cell types in the stomach, including parietal and somatostatin cells. Understanding how these receptors regulate stomach function and growth is key.
Area of Science:
- Gastroenterology
- Endocrinology
- Cell Biology
Background:
- Gastrin's role in acid secretion and mucosal growth is established, but its specific cellular targets remain unclear.
- Previous research has not fully localized or characterized the gastrin receptors responsible for these physiological actions.
Purpose of the Study:
- To investigate the cellular localization of gastrin receptors in the canine fundic mucosa.
- To elucidate the mechanisms by which gastrin receptor signaling influences endocrine, paracrine, and exocrine cell functions.
Main Methods:
- Studies were conducted on canine fundic mucosa.
- Cellular localization and functional effects of gastrin receptors were investigated.
Main Results:
- Gastrin receptors were identified on multiple cell types, including parietal cells and somatostatin cells.
- Evidence suggests a gastrin-inducible histamine pool, likely within histamine-enterochromaffin-like cells.
- Gastrin receptor presence extends beyond a single cell type.
Conclusions:
- Gastrin receptors are distributed across various cell types in the fundic mucosa.
- Further research is needed to understand the integrated signaling pathways regulated by gastrin receptors.
- Elucidating these mechanisms is crucial for understanding the regulation of gastric secretory function and mucosal homeostasis.