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Related Experiment Videos

Human retinal capillary basement membrane leaflets are morphologically distinct: a correlated TEM and SEM analysis.

E C Carlson1

  • 1Department of Anatomy and Cell Biology, School of Medicine, University of North Dakota, Grand Forks 58202.

Experimental Eye Research
|December 1, 1989
PubMed
Summary

This study reveals unique structural components within retinal capillary basement membrane (BM) complexes, crucial for understanding microvascular diseases like diabetic retinopathy.

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Area of Science:

  • Ophthalmology
  • Cell Biology
  • Biochemistry

Background:

  • Retinal microvasculature, particularly basement membranes (BMs), is significantly altered in diseases like diabetic retinopathy.
  • Existing research primarily focuses on cellular elements, neglecting the extracellular matrix (ECM) of retinal capillaries.
  • Ultrastructural studies of retinal capillary ECM and BMs are scarce.

Purpose of the Study:

  • To investigate the ultrastructure of the human retinal capillary extracellular matrix (ECM), focusing on basement membrane (BM) complexes.
  • To correlate transmission electron microscopy (TEM) and scanning electron microscopy (SEM) findings of retinal capillary BM components.
  • To characterize the distinct morphological and biochemical properties of different BM leaflets.

Main Methods:

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  • Correlated transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were employed.
  • Sequential detergent treatment was used to solubilize cellular components while preserving ECM structures.
  • High-resolution SEM was utilized to examine BM surface characteristics.

    • Main Results:

    • Retinal capillary walls consist of endothelial cells and pericytes, surrounded by a BM complex.
    • The BM complex includes pericytic matrix, fibrillar collagen, and distinct subendothelial, pericytic, and Müller cell BM leaflets.
    • BM leaflets exhibit unique substructures, protease susceptibility, and anionic site densities, indicating morphological distinctness.
    • SEM revealed tissue-specific surface characteristics of the BMs.

    Conclusions:

    • Retinal capillary BM complexes are composed of structurally unique subcomponents.
    • These distinct subcomponents' characteristics must be considered in future research on retinal capillary structure, composition, and function.
    • Understanding these BM components is particularly important for pathological conditions affecting retinal capillaries.