Development of laboratory rats receiving silver-enriched ration for a long time

Area of Science:

• Biochemistry
• Toxicology
• Developmental Biology

Background:

• Silver ions can influence essential metal metabolism.
• Early life exposure to metals may have long-term health consequences.
• Copper is vital for numerous physiological processes, including brain function.

Purpose of the Study:

• To investigate the impact of early-life silver ion exposure on copper status and metabolism in rats.
• To assess the effects of silver on copper-related gene expression and protein levels.
• To evaluate the consequences of silver exposure on brain function and development.

Main Methods:

• Rats were fed a silver-enriched diet from birth for six months.
• Copper metabolism was assessed via body weight, organ weights, oxidase activity, ceruloplasmin levels, and copper/silver distribution.
• Gene expression of copper-transporting proteins in the liver was analyzed.
• Brain function was evaluated using behavioral tests (open-field, passive avoidance).

Main Results:

• Silver-enriched diet significantly decelerated rat growth by nearly twofold.
• No acute deficiency in ceruloplasmin-associated copper was observed.
• Copper metabolism in the liver remained unchanged.
• Psychoemotional state and memory functions were comparable to control groups.

Conclusions:

• Early-life silver exposure does not acutely impair copper metabolism or brain function in rats.
• Silver exposure significantly inhibits growth, indicating potential toxicity.
• A potential compensatory mechanism for copper delivery to organs may be activated during early development under silver-induced stress.