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Fulvic and humic acids decrease the absorption of cadmium in the rat intestine
1Toxicology Division, National Food Administration, Uppsala, Sweden.
Archives of Toxicology
|January 1, 1995
Summary
Dissolved organic carbon (DOC) in drinking water significantly reduces cadmium (Cd) intestinal absorption in rats. This protective effect may involve mechanisms beyond simple complexation in the gut lumen.
Area of Science:
- Environmental Science
- Toxicology
- Gastroenterology
Background:
- Dissolved organic carbon (DOC), primarily fulvic and humic acids, is prevalent in drinking water.
- DOC can form complexes with metal ions, potentially influencing their bioavailability.
- Cadmium (Cd) is a toxic heavy metal with known gastrointestinal absorption pathways.
Purpose of the Study:
- To investigate the impact of DOC on the intestinal absorption of cadmium (Cd) in rats.
- To explore the relationship between DOC concentration and Cd absorption.
- To elucidate potential mechanisms underlying DOC's influence on Cd uptake.
Main Methods:
- Utilized an isolated intestinal segment technique in anesthetized rats.
- Exposed intestinal segments to varying concentrations of CdCl2 and DOC.
- Analyzed fractional absorption (FA) and intracellular Cd distribution, including metallothionein binding.
Main Results:
- Cd absorption was dose-dependent at higher Cd concentrations (15 and 150 µg/kg).
- DOC significantly reduced Cd fractional absorption by approximately 50% at 1 and 10 mg/L.
- Higher percentages of Cd were associated with the metallothionein fraction in DOC-treated rats.
Conclusions:
- DOC exerts an inhibitory effect on intestinal Cd absorption in rats.
- The observed reduction in Cd absorption is not solely attributable to direct complexation in the incubation solution.
- Alternative mechanisms, potentially involving interactions within the intestinal lumen, mediate DOC's protective effect against Cd absorption.