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The decrease of free epsilon-amino groups in senile and diabetic cataracts.

F Simonelli1, L Cotticelli, A Iura

  • 1Eye Clinic, First School of Medicine, Naples, Italy.

Ophthalmic Research
|January 1, 1990
PubMed
Summary
This summary is machine-generated.

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Diabetic cataracts show lower free amino groups in lens proteins compared to clear or non-diabetic cataracts. This suggests nonenzymatic glycosylation contributes to diabetic cataract development.

Area of Science:

  • Ophthalmology
  • Biochemistry
  • Diabetic Complications

Background:

  • Cataracts are a leading cause of vision impairment.
  • Diabetic individuals have an increased risk of developing cataracts.
  • The specific molecular changes in diabetic cataracts are not fully understood.

Purpose of the Study:

  • To quantify free epsilon-amino groups in human lens proteins.
  • To compare these levels in clear lenses, non-diabetic senile cataracts, and diabetic cataracts.
  • To investigate the potential role of nonenzymatic glycosylation in diabetic cataract pathogenesis.

Main Methods:

  • Measurement of free epsilon-amino groups in soluble and insoluble protein fractions.
  • Analysis of samples from clear human lenses, non-diabetic senile cataracts, and diabetic cataracts.

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Main Results:

  • A significant reduction in free epsilon-amino group content was observed in both soluble and insoluble proteins of diabetic cataracts.
  • This reduction was more pronounced in diabetic cataracts compared to clear lenses and non-diabetic senile cataracts.

Conclusions:

  • Nonenzymatic glycosylation of lens proteins is likely a significant factor in the development of diabetic cataracts.
  • Altered protein structure due to glycosylation may contribute to lens opacity in diabetes.