High-fat diet-induced obesity impairs endothelium-dependent relaxation in rabbits: association with MLCK upregulation and partial ex vivo improvement by ML-7 - Report - MDSpire
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High-fat diet-induced obesity impairs endothelium-dependent relaxation in rabbits: association with MLCK upregulation and partial ex vivo improvement by ML-7
Obesity Induced by High-Fat Diet Disrupts Endothelium-Dependent Relaxation
Overview
This study demonstrates that high-fat diet-induced obesity in rabbits leads to significant endothelial dysfunction, characterized by impaired endothelium-dependent relaxation and increased myosin light chain kinase (MLCK) expression. Treatment with the MLCK inhibitor ML-7 partially restored relaxation in ex vivo conditions but did not improve in vivo flow-mediated dilation.
Background
Obesity is a major risk factor for cardiovascular diseases, contributing to increased morbidity and mortality. Understanding the mechanisms behind obesity-induced endothelial dysfunction is crucial for developing effective interventions. This study highlights the role of MLCK in mediating vascular injury associated with obesity, emphasizing the need for targeted therapies.
Data Highlights
Parameter
HFD Group
Control Group
P-Value
Body Weight Increase
+27.85%
Baseline
-
Total Cholesterol
Elevated
Normal
< 0.001
LDL-C
Elevated
Normal
< 0.001
Fasting Glucose
Elevated
Normal
< 0.05
ACh-Induced Relaxation
Impaired
Normal
< 0.05
MLCK Expression
Increased
Normal
< 0.001
Key Findings
HFD-fed rabbits exhibited a 27.85% increase in body weight compared to controls.
Significant dyslipidemia was observed, with elevated total cholesterol and LDL-C levels (P < 0.001).
Endothelial dysfunction was characterized by impaired flow-mediated dilation (FMD) and reduced ACh-induced relaxation (P < 0.05).
MLCK expression was significantly increased in HFD rabbits (P < 0.001), while eNOS levels remained unchanged.
ML-7 treatment reduced MLCK expression and partially restored ACh-induced relaxation at higher concentrations (P < 0.05).
FMD in vivo did not improve with ML-7 treatment, indicating a complex relationship between ex vivo and in vivo endothelial function.
Clinical Implications
The findings underscore the importance of addressing obesity as a modifiable risk factor for cardiovascular diseases. Targeting MLCK may offer a therapeutic avenue for restoring endothelial function, although the lack of in vivo improvement in FMD suggests that further research is needed to validate noninvasive measures of endothelial health.
Conclusion
Obesity-induced endothelial dysfunction is linked to MLCK upregulation, and while ML-7 shows promise in ex vivo settings, its limited impact on in vivo endothelial function highlights the complexity of vascular health assessment.
