Changes in gastroduodenal 5-hydroxytryptamine-containing cells induced by dehydroleucodine

Area of Science:

• Pharmacology
• Gastroenterology
• Natural Products Chemistry

Background:

• Dehydroleucodine (DhL), a lactone from Artemisia douglasiana Besser, previously showed efficacy in preventing ethanol-induced gastroduodenal damage.
• The precise mechanism of DhL's protective action, particularly concerning cellular responses and inflammatory mediators, requires further elucidation.

Purpose of the Study:

• To investigate the mechanism of action of dehydroleucodine (DhL) in preventing gastroduodenal injury.
• To examine the effects of DhL on gastroduodenal cells containing 5-hydroxytryptamine (5-HT) in response to ethanol (EtOH) challenge.

Main Methods:

• Mice were allocated to four experimental groups: control, DhL treatment, ethanol (EtOH) exposure, and combined DhL + EtOH treatment.
• Immunohistochemistry and image analysis were employed to quantify 5-HT-containing cells and their area in the stomach and duodenum.

Main Results:

• Ethanol (EtOH) significantly reduced the number and area of 5-HT-immunopositive cells in the gastroduodenal mucosa.
• Pre-treatment with dehydroleucodine (DhL) effectively prevented the EtOH-induced decrease in 5-HT-immunopositive cells and their occupied area.
• DhL alone did not alter gastric 5-HT cell parameters but reduced duodenal 5-HT cell numbers without affecting area.

Conclusions:

• Dehydroleucodine (DhL) likely acts as a 'cell stabilizer' by inhibiting the release of the inflammatory mediator 5-hydroxytryptamine (5-HT) from endocrine cells.
• These findings suggest a novel mechanism for DhL's gastroprotective effects, involving the modulation of 5-HT release in response to injury.