Objective: Advanced maternal age (AMA) is increasingly becoming a relevant issue due to late marriage and advances in reproductive technology. AMA complicates adverse pregnancy outcomes including hypertensive disorders of pregnancy (HDP), fetal growth restriction (FGR), and stillbirth. However, the mechanism underlying the relationships between AMA and these pathological conditions remains unclear. Here, we established a mouse model of AMA using aged pregnant ICR mice, investigated its phenotypes, and analyzed the profiles of HDP-related biomarkers.
Methods: AMA model mice were pregnant Jcl:ICR mice aged over six months. Control mice were pregnant mice aged 8–13 weeks. We first analyzed phenotypes including fetal and placental weight, litter size, and percentage of intrauterine fetal death (IUFD). We then measured blood pressure during pregnancy and analyzed the profiles of HDP-related biomarkers including soluble fms-like tyrosine kinase-1 (sFlt-1) and placental growth factor (PlGF). Finally, we assessed the evidence underlying placental senescence that could affect blood pressure in the AMA model.
Results: AMA mice presented with the same complications as their human counterparts, including declining fertility, FGR, and a higher rate of IUFD. AMA mice exhibited increased systolic blood pressure at late gestation, which subsequently normalized after delivery, as in human HDP patients. Both AMA mice and human HDP patients exhibited low serum sFlt-1 levels in late gestation despite being complicated with HDP and placental dysfunction (AMA group vs control group (mice): 16,800.0±10,709.5 vs 26,611.9±8,702.0 pg/mL, P<0.01; (human): 8,507.6±3,298.7 vs 14,816.9±5,413.5 pg/mL, P<0.05). p53 expression was significantly increased in the placenta of AMA mice.
Conclusion: Phenotypes of AMA mice resembled those of their human counterparts, including declining fertility, FGR, IUFD, and HDP. We also identified novel sFlt-1 profiles in aged HDP patients and AMA mice that were significantly lower than that in young individuals and mice. Our findings suggest that the pathogenesis of HDP in AMA may differ relative to that in individuals with younger maternal age.
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