The Schlager mouse as a model of altered retinal phenotype.

Area of Science:

• Ophthalmology
• Cardiovascular Science
• Genetics

Background:

• Hypertension is a significant risk factor for numerous vision-threatening ocular disorders.
• The BPH/2J mouse strain, characterized by chronic hypertension due to elevated sympathetic nervous system activity, serves as a model for studying hypertension-related eye conditions.

Purpose of the Study:

• To investigate the retinal neural structure in hypertensive BPH/2J mice and compare it with normotensive BPN/3J controls.
• To determine if elevated blood pressure is the cause of the observed retinal neural phenotype in the BPH/2J strain.
• To identify potential genetic factors or congenital defects contributing to early-onset retinal damage.

Main Methods:

• Comparative analysis of retinal neural structure between hypertensive BPH/2J mice and normotensive BPN/3J mice at 21 weeks of age.
• Investigation of retinal neural tissue in both mouse strains at 4 weeks of age to assess early-onset damage.
• Utilizing the BPH/2J mouse model to study the impact of hypertension on retinal integrity.

Main Results:

• Hypertensive BPH/2J mice exhibited a complete loss of outer retinal neural layers by 21 weeks of age, indicating severe, vision-threatening disease.
• Preliminary findings at 4 weeks of age revealed significant retinal neural damage in the BPH/2J strain, suggesting an early onset.
• The observed retinal phenotype in BPH/2J mice is strongly associated with elevated blood pressure.

Conclusions:

• The BPH/2J mouse strain develops severe, early-onset retinal neural damage, likely due to hypertension.
• Further research on the BPH/2J strain may elucidate gene defects and mechanisms underlying retinal disease.
• This model offers potential for testing therapeutic molecules to prevent or treat hypertension-induced retinal damage.