Developmental Toxicity Assessment in Laboratory Mammals
Summary
The assessment of developmental toxicity in laboratory mammals is fundamental for evaluating the safety of chemicals, pharmaceuticals and environmental agents that may affect prenatal and postnatal growth and development. Standard protocols employ rodent or non-rodent species—typically rats, mice, rabbits or non-human primates—administered test substances during critical windows of organogenesis and gestation. End points include maternal toxicity, embryonic and fetal viability, morphological malformations, growth parameters and functional outcomes. Gross and histopathological examinations of visceral and skeletal structures reveal structural abnormalities, while advances in high-resolution imaging—such as micro-computed tomography and three-dimensional optical projection tomography—allow early detection of ossification delays, skeletal anomalies and subtle morphological changes. The determination of a no-observed-adverse-effect level (NOAEL) underpins risk assessment frameworks, enabling the derivation of reference doses through application of uncertainty factors that account for interspecies differences and human variability. Integrated approaches have expanded to include mechanistic biomarkers, placental transfer studies and in vitro assays aligned with adverse outcome pathways. Collectively, these methods support a weight-of-evidence approach for hazard identification, dose-response characterisation and regulatory decision-making, with global implications for drug development, chemical safety and public health protection.
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Developmental Toxicity Assessment in Laboratory Mammals publication trend
The graph below shows the total number of articles in developmental toxicity assessment in laboratory mammals across all publications each year (not limited to Nature Index journals).
Technical terms
No-observed-adverse-effect level (NOAEL): The highest dose at which no statistically or biologically significant adverse effects are observed in exposed subjects.
Teratogenicity: The capacity of an agent to induce structural malformations or defects in the developing embryo or fetus.
Embryotoxicity: Adverse effects on the embryo that result in impaired growth, development or survival prior to fetal stages.
Foetotoxicity: Harmful effects on the fetus, including growth retardation, functional impairment or death, occurring after organogenesis.
Ossification centre: A focal region within developing cartilage that initiates bone formation.
Placental transfer: The process by which substances move from the maternal circulation to the fetal compartment across the placenta.
References
- Bone development in laboratory mammals used in developmental toxicity studies. Birth Defects Research (2018).
- Effect of P-glycoprotein Inhibitor (Carvedilol) on Developmental Outcome Methotrexate are Given Alone and in Combination of Pregnant Rats. The Iraqi Journal of Veterinary Medicine (2022).
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