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Enterochromaffin cells

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Serotonin-skeletal

Serotonin

Enterochromaffin (EC) cells (Kulchitsky cells) are a type of enteroendocrine cell[1] occurring in the epithelia lining the lumen of the gastrointestinal tract.

Function

They produce and contain about 90% of the body's store of serotonin (5-HT).

In the gastrointestinal tract, 5-HT is important in response to chemical, mechanical or pathological stimuli in the lumen. It activates both secretory and peristaltic reflexes, and activates vagal afferents (via 5-HT3 receptors) that signal to the brain (important in the generation of nausea).

Ondansetron is an antagonist of the 5-HT3 receptor and is an effective anti-emetic.

Etymology

They are called "entero"[2] meaning related to the gut and "chromaffin" because of a chromium salt reaction that they share with chromaffin cells of the adrenal medulla (adrenal glands). [3]

"Enterochromaffin-like cells"

Another population of chromaffin cells is found only in the stomach wall, called enterochromaffin-like cells (ECL). They look "like" EC cells but do not contain 5-HT.

ECL cells respond to acetylcholine released by the vagus nerve and they in turn release histamine, which will stimulate the G cells to produce gastric acid.

See also

References

  1. MeSH Enterochromaffin+Cells
  2. http://www.medterms.com/script/main/art.asp?articlekey=3258
  3. GPnotebook 1516961798


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