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Related Experiment Videos

Basal linear deposit in the human macula.

K U Löffler, W R Lee

    Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie
    |January 1, 1986
    PubMed
    Summary

    The basal linear deposit in elderly human eyes shows abnormalities like electron-dense material and collagen. These changes are linked to neovascularization, suggesting it

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    Area of Science:

    • Ophthalmology
    • Cell Biology
    • Pathology

    Background:

    • The basal linear deposit (BLD) is an age-related abnormality found in the macular region of the eye.
    • Understanding the composition and pathological role of BLD is crucial for age-related macular degeneration research.

    Purpose of the Study:

    • To investigate the ultrastructural and molecular characteristics of the basal linear deposit.
    • To determine the relationship between BLD and neovascularization in the elderly human eye.

    Main Methods:

    • Electron microscopy was used to examine macular tissue from nine enucleated elderly human eyes.
    • Immunohistochemistry was employed to identify specific components within the basal linear deposit and Bruch's membrane.

    Main Results:

    • Observed abnormalities in BLD include bush-like deposits, wide-banded collagen, vesiculoid elements, and melanin granules.
    • Fibronectin was present in BLD and Bruch's membrane; mucopolysaccharides were absent.
    • Electron-empty spaces indicated potential water permeability disturbances.
    • Neovascularization beneath the retinal pigment epithelium correlated with abundant BLD.
    • Macrophage and endothelial cell processes eroded Bruch's membrane.

    Conclusions:

    • The basal linear deposit exhibits diverse ultrastructural abnormalities.
    • BLD is identified as a significant precursor to neovascularization in the elderly human eye.
    • Further research into the pathogenetic mechanisms of BLD is warranted.

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