Evidence for thimerosal induced cytoprotection on rat stomach

Area of Science:

• Pharmacology
• Gastroenterology
• Toxicology

Background:

• Gastric ulcers are a significant health concern.
• Understanding protective mechanisms against ulceration is crucial for developing effective treatments.

Purpose of the Study:

• To investigate the antiulcerogenic properties of thimerosal.
• To determine the effective route of administration and duration of action.
• To elucidate the structure-activity relationship of thimerosal's antiulcerogenic effect.

Main Methods:

• Administration of thimerosal via intragastric and intravenous routes in rodent models.
• Induction of gastric ulcers using ethanol, acetylsalicylic acid, and stress.
• Determination of the median inhibitory dose (ID50).
• Structure-activity relationship analysis focusing on mercury and thiosalicylic acid moieties.

Main Results:

• Intragastric thimerosal demonstrated significant protection against ethanol-induced ulcers (ID50 = 1.6 mg/kg).
• Intravenous administration showed markedly reduced efficacy (ID50 > 30 mg/kg).
• The antiulcerogenic effect persisted for over 20 hours.
• Thimerosal also protected against acetylsalicylic acid (ID50 = 6.8 mg/kg) and stress-induced ulceration (ID50 = 9.2 mg/kg).

Conclusions:

• Oral administration of thimerosal possesses potent antiulcerogenic properties.
• The mercury component of thimerosal is essential for its protective effect against gastric ulcers.
• Thimerosal offers a sustained protective effect against various ulcerogenic agents.