Nano‐analysis Reveals High Fraction of Serotonin Release during Exocytosis from a Gut Epithelium Model Cell.

Wang, Ying; Gu, Chaoyi; Patel, Bhavik Anil; Ewing, Andrew G.

Electrochemical methods were used to explore the exocytotic nature of serotonin (5‐HT) release in human carcinoid BON cells, an in vitro human enterochromaffin cell model, to understand the mechanisms operating the release of gut‐derived 5‐HT in the intestinal mucosal epithelium. We show that the fractional vesicular 5‐HT release in BON cells is 80 % compared to previous work in pancreatic beta cells (34 %). The fractional release increased from 80 % in control BON cells to 87 % with 5‐HT preincubation and nearly 100 % with the combination of 5‐HT and the 5‐HT4 autoreceptor agonist, cisapride. Thus, partial release is the primary mechanism of exocytosis in BON cells, resulting in a variable amount of the vesicular content being released. Factors that control secretion of 5‐HT from enterochromaffin cells or BON cells are important as partial release provides a mechanism for development of effective therapeutic strategies to treat gastrointestinal diseases.

EXOCYTOSIS; ENTEROENDOCRINE cells; SEROTONIN; SMALL intestine; EPITHELIUM; PANCREATIC beta cells; GASTROINTESTINAL diseases; INTESTINES

Angewandte Chemie, 2021, Vol 133, Issue 44, p23744

0044-8249

Academic Journal

10.1002/ange.202108193