Retinal vascular changes and systemic diseases: corrosion cast demonstration

Area of Science:

• Ophthalmology
• Vascular Biology
• Pathology

Background:

• Systemic diseases can manifest with specific changes in retinal vasculature.
• Understanding these changes is crucial for early diagnosis and disease management.
• Rat models offer valuable insights into human disease pathologies.

Purpose of the Study:

• To identify and characterize specific retinal vascular alterations in rat models of aging and systemic diseases.
• To correlate distinct retinal vascular changes with specific conditions like hypertension, hypercholesterolemia, and diabetes mellitus.
• To evaluate the utility of scanning electron microscopy of vascular corrosion casts for visualizing these changes.

Main Methods:

• Utilized Wistar Kyoto rats for aging controls.
• Employed spontaneously hypertensive rats (SHR), inherited hypercholesterolemia rats (RICO), and Otsuka Long-Evans Tokushima Fatty (OLETF) rats for disease models.
• Prepared retinal vascular corrosion casts for scanning electron microscopy (SEM).
• Performed transmission electron microscopy (TEM) for detailed vessel examination.

Main Results:

• Aging: Narrowing and thin thread-like capillaries.
• Hypertension (SHR): Capillary tortuosity, irregularity, and narrowing.
• Hypercholesterolemia (RICO): Straightening of retinal vessels.
• Diabetes Mellitus (OLETF): Loop formation and microaneurysms.
• SEM of corrosion casts provided clear, three-dimensional visualization of these specific changes.

Conclusions:

• Distinctive retinal vascular changes are associated with aging, hypertension, hypercholesterolemia, and diabetes mellitus in rat models.
• Scanning electron microscopy of corrosion casts is an effective method for visualizing these specific vascular alterations.
• These findings contribute to understanding the ocular manifestations of systemic diseases.