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Related Experiment Videos

Morphological study on glycosaminoglycans in the developing human vitreous.

S Akiya, Y Uemura, U Saga

    Ophthalmic Research
    |January 1, 1984
    PubMed
    Summary

    Vitreous humor glycosaminoglycans, including hyaluronic acid, are abundant in early human embryos but decrease significantly by the 12th-13th week of fetal development. This study identifies key components and their changing concentrations during embryonic development.

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    Area of Science:

    • Developmental biology
    • Histochemistry
    • Biochemistry

    Background:

    • The vitreous humor composition changes during embryonic development.
    • Understanding these changes is crucial for comprehending ocular development.

    Purpose of the Study:

    • To investigate the changes in glycosaminoglycans (GAGs) in the human vitreous during embryonic and fetal development.
    • To identify the specific GAGs present and their concentration over time.

    Main Methods:

    • Histochemical staining with alcian blue.
    • Enzymatic digestion methods.
    • Scott-Dorling method for GAG identification.

    Main Results:

    • Alcian blue staining was strong in 7th- to 9th-week human embryos/fetuses, indicating high GAG content.

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  • Staining intensity markedly decreased in 12th- and 13th-week fetuses.
  • Identified GAGs included hyaluronic acid and chondroitin sulfate or dermatan sulfate.

    • Conclusions:

    • Vitreous GAG concentration is high in early embryonic stages (7-8 weeks) and declines in later fetal development (12-13 weeks).
    • Distinguishing primary and secondary vitreous using classical histochemical methods is challenging.
    • Hyaluronic acid and chondroitin/dermatan sulfate are key components of the developing human vitreous.