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Protective effects of pravastatin on the embryonic cardiovascular system during hypoxic development
Nozomi Itani1, Katie L Skeffington1, Christian Beck1
1Department of Physiology, Development & Neuroscience, University of Cambridge, Cambridge, UK.
Insights
Pravastatin protects the developing cardiovascular system in hypoxic chicken embryos. This cholesterol-lowering drug may help prevent fetal heart problems in high-risk pregnancies.
Area of Science:
- Cardiovascular Research
- Developmental Biology
- Pharmacology
Background:
- Statins are considered for complicated pregnancies due to potential benefits for maternal endothelial function.
- The direct impact of statins on fetal cardiovascular development remains largely unknown.
- Hypoxic conditions during pregnancy can negatively affect fetal development.
Purpose of the Study:
- To investigate the direct effects of pravastatin on the cardiovascular system of a hypoxic chicken embryo model.
- To elucidate the underlying mechanisms of pravastatin's action on embryonic cardiovascular function.
- To assess the potential of pravastatin for treating fetal cardiovascular dysfunction.
Main Methods:
- Chicken embryos were exposed to normoxia or hypoxia (14% O2) from day 1.
- Pravastatin (1 mg/kg/d) was administered from day 13 of incubation until day 19.
- Cardiovascular structure and function were assessed in isolated hearts and vessels.
Main Results:
- Pravastatin treatment significantly protected hypoxic chicken embryos from cardiovascular dysfunction.
- Mechanisms included reduced oxidative stress, enhanced nitric oxide (NO) bioavailability, and restored antioxidant defenses.
- Normalized RhoA protein expression in the embryonic heart and improved NO-dependent vasodilation were observed.
Conclusions:
- Pravastatin exerts direct beneficial effects on the embryonic cardiovascular system in a model of chronic hypoxia.
- These findings, equivalent to late-term human pregnancy, suggest pravastatin's potential for clinical translation.
- Pravastatin may be a candidate therapeutic to mitigate fetal cardiovascular dysfunction in at-risk pregnancies.
Abstract:
The use of statins in complicated pregnancy is being considered, as they protect endothelial function in the mother and placenta. However, whether statins affect cardiovascular function in the fetus is completely unknown. Here, we have determined the effects of pravastatin and underlying mechanisms on the cardiovascular system of the hypoxic chicken embryo, a model system that permits the direct effects of pravastatin on the developing offspring to be isolated independently of additional effects on the mother and/or placenta. Chicken embryos were incubated under normoxia or hypoxia (14% O2 ) from day 1 ± pravastatin (1 mg/kg/d) from day 13 of incubation (term is 21 days). On day 19 of incubation, hearts and vessels were isolated to determine changes in the cardiovascular structure and function. The data show that pravastatin protected the hypoxic chicken embryo against impaired cardiovascular dysfunction. Mechanisms involved in this protection included reduced oxidative stress, enhanced NO bioavailability, restored antioxidant defenses and normalized protein expression of RhoA in the embryonic heart, and improved NO-dependent vasodilator mechanisms in the peripheral circulation. Therefore, we show that the treatment of the chronically hypoxic chicken embryo with pravastatin from day 13 of incubation, equivalent to ca. 25 weeks of gestation in human pregnancy, has direct beneficial effects on the embryonic cardiovascular system. Therefore, pravastatin may be a candidate for human clinical translation to rescue fetal cardiovascular dysfunction in risky pregnancy.
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