Assessing Sex Differences in Metabolic Disease on Vasculopathy Using the Vascular Health Index

Area of Science:

• Cardiovascular Science
• Endocrinology
• Metabolic Disease Research

Background:

• Vascular health research often focuses on specific outcomes, hindering integrated status assessment.
• Understanding integrated vascular health across diverse risk conditions remains challenging.
• Quantifying sex-dependent differences in vascular health during metabolic disease is crucial.

Purpose of the Study:

• To quantify sex-dependent differences in peripheral and cerebral vascular health in metabolic disease.
• To investigate the role of sex hormones in protecting vascular health during metabolic disease.

Main Methods:

• Utilized the vascular health index (VHI) for simultaneous assessment of vascular reactivity, mechanics, and microvessel density.
• Compared male and female obese Zucker rats (OZR) with lean Zucker rats (LZR).
• Assessed VHI in ovariectomized (OVX) female OZR to determine the role of sex hormones.

Main Results:

• Obese male rats showed more rapid and severe decline in vascular health index (VHI) compared to obese female rats.
• Vascular health protection in obese female rats was dependent on intact sex hormone cycling.
• Ovariectomy (OVX) in female rats eliminated the protective effect on VHI.

Conclusions:

• Female rats exhibit sex-based protection in peripheral and cerebral vascular health during metabolic disease.
• This protection is mediated by normal female sex hormone cycling.
• Findings highlight the critical role of sex hormones in mitigating vascular complications of metabolic disease.