Prenatal hypoxia plus postnatal high-fat diet exacerbated vascular dysfunction via up-regulated vascular Cav1.2...

Area of Science:

• Cardiovascular Physiology
• Developmental Biology
• Nutritional Science

Background:

• Prenatal hypoxia can negatively impact offspring development.
• Postnatal diet composition plays a crucial role in long-term health.
• Understanding combined environmental insults is key to preventing chronic diseases.

Purpose of the Study:

• To investigate the synergistic effects of prenatal hypoxia and postnatal high-fat diet on offspring vascular function.
• To elucidate the specific molecular mechanisms, particularly ion channel remodeling, underlying diet-induced vascular dysfunction in offspring exposed to prenatal hypoxia.

Main Methods:

• Rat dams were exposed to hypoxia or normoxia during gestation.
• Offspring were fed a standard or high-fat diet postnatally.
• Vascular function, blood pressure, and ion channel expression (Cav1.2, BK channels) were assessed.

Main Results:

• Prenatal hypoxia led to decreased birth weight.
• Combined hypoxia and high-fat diet elevated lipids and worsened blood pressure.
• Significant increases in L-type voltage-gated Ca2+ (Cav1.2) channel currents and expression were observed in hypoxic offspring on a high-fat diet.
• Large-conductance Ca2+-activated K+ (BK) channel currents and β1 subunits increased in high-fat diet offspring, irrespective of prenatal hypoxia.

Conclusions:

• Prenatal hypoxia followed by a postnatal high-fat diet induces significant vascular dysfunction.
• This dysfunction is mediated by alterations in ion channel expression and function within vascular myocytes.
• Ion channel remodeling is a key mechanism linking developmental insults and diet to cardiovascular disease.