Reproductive, teratologic, and mutagenic studies with some polydimethylsiloxanes

Area of Science:

• Toxicology
• Reproductive Toxicology
• Developmental Toxicology

Background:

• Polydimethylsiloxanes (PDMS) are widely used silicones.
• Assessing the reproductive and developmental safety of PDMS is crucial for human health.
• Limited data exists on the specific effects of certain PDMS formulations.

Purpose of the Study:

• To evaluate the reproductive and fetal development effects of selected polydimethylsiloxanes (PDMS) in rats and rabbits.
• To determine the mutagenic potential of a specific PDMS material in mice.

Main Methods:

• Two three-phase reproductive and developmental toxicity studies in rats and rabbits using a 350 cSt PDMS fluid.
• Mutagenicity testing in male mice using a 7 cSt PDMS fluid.
• Teratogenicity studies in rats and rabbits with 7 cSt and 10 cSt PDMS fluids, respectively.

Main Results:

• A dose-related incidence of in utero mortality was observed in rats at 200 and 1,000 mg/kg sc with 350 cSt PDMS in one study; no fetotoxicity was seen in a second study.
• Talipes varus incidence in rabbits at 200 mg/kg sc with 350 cSt PDMS was not considered significant due to higher control rates and absence at higher doses/in companion studies.
• A 7 cSt PDMS fluid was nonteratogenic in rats (oral doses up to 1,000 mg/kg) and nonmutagenic in mice (ip doses of 5 and 10 g/kg).
• A 10 cSt PDMS fluid was nonteratogenic in rabbits (dermal dose of 200 mg/kg).

Conclusions:

• Selected polydimethylsiloxanes (PDMS) demonstrate a low potential for reproductive and developmental toxicity.
• The tested PDMS fluids exhibited no significant teratogenic or mutagenic effects in the conducted animal models.
• Findings support the general safety of these specific PDMS materials in reproductive and developmental contexts.