Aspirin-induced ultrastructural changes in human gastric mucosa: correlation with potential difference

Area of Science:

• Gastroenterology
• Cell Biology
• Pharmacology

Background:

• The gastric mucosal barrier protects the stomach lining from damage.
• Aspirin is a common medication known to affect the gastrointestinal tract.

Purpose of the Study:

• To investigate the acute effects of aspirin on the human gastric mucosal barrier.
• To correlate changes in gastric electrical potential difference with ultrastructural damage.

Main Methods:

• Gastric potential difference measurements in seven subjects before and after aspirin ingestion.
• Gastric biopsies analyzed using light, transmission electron, and scanning electron microscopy.
• Quantification of surface epithelial cell damage post-aspirin exposure.

Main Results:

• Aspirin significantly reduced gastric potential difference from -48 mV to -39 mV within 10 minutes.
• Microscopy revealed focal cell disruption, loss of mucous granules, and altered cell surface morphology.
• Twenty-five percent of surface epithelial cells showed damage at 10 minutes, with significant recovery by 1 hour.

Conclusions:

• Single therapeutic doses of aspirin induce focal damage to the human gastric mucosa.
• The gastric mucosal barrier integrity is compromised by aspirin, evidenced by reduced potential difference and cellular damage.
• The gastric mucosa demonstrates a capacity for rapid recovery after aspirin-induced injury.