Plasma Inorganic Pyrophosphate Deficiency Links Multiparity to Cardiovascular Disease Risk

Area of Science:

• Biochemistry and Cardiovascular Science
• Reproductive Health and Endocrinology

Background:

• Elevated alkaline phosphatase activity correlates with cardiovascular disease (CVD) risk.
• Multipara (women with multiple childbirths) face increased late-onset CVD risk.
• A potential common cause is insufficient inorganic pyrophosphate, an ectopic mineralization inhibitor and alkaline phosphatase substrate.

Purpose of the Study:

• To investigate the hypothesis that gestational pyrophosphate deficiency contributes to multiparity-associated cardiovascular disease risk.
• To examine the relationship between pregnancy, alkaline phosphatase activity, and pyrophosphate levels.
• To assess vascular calcification in multiparous women with pseudoxanthoma elasticum, a condition with low intrinsic pyrophosphate.

Main Methods:

• Studied plasma pyrophosphate kinetics pre- and postpartum in sheep and at term in humans.
• Correlated alkaline phosphatase activity with pyrophosphate concentrations during pregnancy.
• Evaluated vascular calcification in pseudoxanthoma elasticum patients with varying parity.

Main Results:

• Demonstrated a shortage of plasma pyrophosphate during pregnancy, mirroring elevated alkaline phosphatase activity.
• Confirmed increased vascular calcification in multiparous pseudoxanthoma elasticum patients.
• Indicated that repeated pregnancies may exacerbate pyrophosphate deficiency and vascular calcification.

Conclusions:

• Transient pyrophosphate shortages during repeated pregnancies may contribute to vascular calcification.
• This deficiency could underlie the increased cardiovascular disease risk observed in multiparous women.
• Gestational pyrophosphate supplementation warrants investigation as a prophylactic treatment for high-risk women.