Strain-dependent vascular remodeling phenotypes in inbred mice.

Area of Science:

• Vascular biology
• Genetics
• Cardiovascular research

Background:

• Arterial remodeling is a complex process affecting vessel structure.
• Mouse models are crucial for studying vascular diseases.
• Genetic background influences the response to vascular injury.

Purpose of the Study:

• To investigate the genetic control of arterial remodeling.
• To compare the response to carotid artery ligation across different mouse strains.
• To elucidate the mechanisms underlying vascular lumen narrowing.

Main Methods:

• Established a mouse model of arterial remodeling via carotid artery ligation.
• Applied the model to various inbred mouse strains (SJL/J, FVB/NJ, SM/J, A/J, C3H/HeJ).
• Assessed lumen area, vessel diameter, medial hypertrophy, and neointima formation.
• Performed in vitro smooth muscle cell (SMC) proliferation assays.
• Analyzed SMC death in vivo post-ligation.

Main Results:

• Significant variations in arterial remodeling were observed among mouse strains.
• SJL/J mice exhibited the most extensive inward remodeling (78% lumen area decrease).
• FVB/NJ mice showed neointima formation due to accelerated SMC proliferation.
• SM/J and A/J mice displayed positive remodeling with increased lumen area (>20%).
• FVB/NJ SMCs demonstrated faster growth in vitro; in vivo, FVB/NJ experienced SMC loss post-ligation, unlike C3H/HeJ.

Conclusions:

• The mechanisms driving vascular remodeling and lumen narrowing are genetically determined.
• Strain-specific differences in SMC proliferation and death contribute to remodeling outcomes.
• This study highlights the genetic basis of vascular repair and disease susceptibility.