Octamethylcyclotetrasiloxane (D4) lacks endocrine disruptive potential via estrogen pathways
by:
Borgert CJ, Burgoon LD
Borgert CJ, Burgoon LD
Summary:
Octamethylcyclotetrasiloxane (D4), a volatile lipophilic silicone monomer used in consumer and industrial products, has conflicting toxicological interpretations: some reviews attribute its endocrine-sensitive effects to systemic toxicity, while others label it an estrogenic endocrine disruptor (EDC) based on ERα interactions in screening assays and high-dose rodent impacts. To resolve this, we tested hypotheses on D4-ERα interactions at biochemical, molecular, and physiological levels. These analyses consistently showed that an estrogenic basis for D4's effects is implausible across all levels, supporting prior conclusions against EDC classification. Claims linking screening assays (RUA, ERTA) to adversity rely on flawed methods of interpretation; instead, rodent adverse effects, including reproductive effects, likely arise from high-dose physico-chemical membrane perturbations and species-specific sensory irritation.
Octamethylcyclotetrasiloxane (D4), a volatile lipophilic silicone monomer used in consumer and industrial products, has conflicting toxicological interpretations: some reviews attribute its endocrine-sensitive effects to systemic toxicity, while others label it an estrogenic endocrine disruptor (EDC) based on ERα interactions in screening assays and high-dose rodent impacts. To resolve this, we tested hypotheses on D4-ERα interactions at biochemical, molecular, and physiological levels. These analyses consistently showed that an estrogenic basis for D4's effects is implausible across all levels, supporting prior conclusions against EDC classification. Claims linking screening assays (RUA, ERTA) to adversity rely on flawed methods of interpretation; instead, rodent adverse effects, including reproductive effects, likely arise from high-dose physico-chemical membrane perturbations and species-specific sensory irritation.