Vascular Hyperpermeability Response in Animals Systemically Exposed to Arsenic.

Area of Science:

• Toxicology
• Cardiovascular Science
• Environmental Health

Background:

• Cardiovascular diseases linked to chronic arsenic exposure lack clear underlying mechanisms.
• Vascular leakage is a potential factor in arsenic-induced cardiovascular pathology.

Purpose of the Study:

• To determine if arsenic exposure enhances vascular leakage induced by mustard oil in mice.
• To assess if elevated vascular leakage persists after arsenic cessation.

Main Methods:

• Mice received sodium arsenite (10, 15, or 20 mg/kg/day) or water for 8 weeks.
• Vascular permeability was measured using the Evans blue (EB) assay after mustard oil challenge.
• Effects of arsenic discontinuation (2 or 6 months) on vascular leakage were evaluated.

Main Results:

• High-dose (20 mg/kg) arsenic significantly increased mustard oil-induced vascular leakage compared to controls.
• Low and mid-dose arsenic (10, 15 mg/kg) did not significantly alter mustard oil-induced leakage.
• Increased vascular leakage in high-dose arsenic mice normalized after 2-6 months of arsenic discontinuation.

Conclusions:

• High-dose arsenic exposure potentiates inflammatory vascular leakage.
• The detrimental effects on vascular permeability are reversible upon arsenic cessation.
• This suggests a dose-dependent, reversible mechanism for arsenic-induced cardiovascular complications.