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Serotonin and carcinoid tumors.

Journal of Cardiovascular Pharmacology

|January 1, 1985

Summary

Enterochromaffin cells produce serotonin and substance P, which are implicated in gastrointestinal function and carcinoid tumors. Midgut carcinoids, common in the small intestine, often secrete these substances, leading to carcinoid syndrome.

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Area of Science:

Gastroenterology
Endocrinology
Oncology

Background:

The enterochromaffin (EC) cell system is widespread in the gastrointestinal tract.
EC cells are primary producers of intestinal serotonin (5-HT) and may also synthesize peptides like substance P (SP).
Coexistence of 5-HT and SP in EC cells suggests shared functions, including regulating gastric acid, intestinal motility, and fluid secretion.

Purpose of the Study:

To explore the role of EC cells and their secretory products in gastrointestinal function.
To investigate the characteristics and clinical implications of carcinoid tumors, particularly midgut carcinoids.
To understand the pathogenesis of carcinoid syndrome related to 5-HT and SP secretion.

Main Methods:

Histochemical analysis, including the argentaffin reaction for 5-HT detection.
Immunocytochemistry using specific antisera to identify secretory products.
Clinical and pathological review of carcinoid tumors based on origin and metastatic potential.

Main Results:

Midgut carcinoids commonly produce both 5-HT and SP, identifiable via argentaffin reactions and immunocytochemistry.
While appendix carcinoid tumors are often benign, small intestinal carcinoids exhibit varied growth and metastatic potential.
Carcinoid syndrome symptoms manifest when the body's capacity to inactivate 5-HT is overwhelmed or with extraintestinal tumor locations.

Conclusions:

EC cells and their secretory products, 5-HT and SP, play significant roles in gut physiology and pathology.
Carcinoid tumors, especially those of midgut origin, are important clinical entities with distinct biochemical and histochemical features.
Understanding the mechanisms of carcinoid tumor development and secretion is crucial for managing carcinoid syndrome.

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