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Precision Ultrasound-guided Stem Cell Delivery for Vascular Repair in Aortic Diseases

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Pravastatin reduces Marfan aortic dilation.

Darren McLoughlin¹, Jonathan McGuinness, John Byrne

¹Department of Surgery, Royal College of Surgeons in Ireland, Dublin, Ireland.

|September 14, 2011

Summary

Statins and losartan effectively reduce aortic root dilation in Marfan syndrome mice by preserving elastin and decreasing protein synthesis in vascular smooth muscle cells.

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Area of Science:

Cardiovascular Research
Genetics and Disease
Pharmacology

Background:

Marfan syndrome is characterized by lethal aortic root dilation due to matrix element imbalance and excessive TGF-β signaling.
This imbalance leads to increased metalloproteinase activity in the aortic medial layer.

Purpose of the Study:

To investigate the efficacy of statins in attenuating aortic root dilation in a Marfan syndrome mouse model.
To compare the effects of statins with losartan, another proposed preventative agent.

Main Methods:

Marfan mice (C1039G fibrillin-1 mutation) were treated with pravastatin or losartan from 6 weeks of age.
Aortic root diameter, thickness, elastin volume, cardiac function (dp/dtmax), and ultrastructure were analyzed.

Main Results:

Both pravastatin and losartan significantly reduced aortic root dilation in Marfan mice compared to untreated controls.
Both drugs preserved medial layer elastin volume and reduced rough endoplasmic reticulum in smooth muscle cells, indicating decreased protein synthesis.

Conclusions:

Statins demonstrate comparable efficacy to losartan in mitigating aortic root dilation in a Marfan syndrome mouse model.
Statins may offer a clinically useful, well-tolerated long-term treatment option by reducing excessive protein production in vascular smooth muscle cells.