Protein and electrolyte alterations in human senile cataract

Area of Science:

• Ophthalmology
• Biochemistry
• Gerontology

Background:

• Cataracts, particularly senile cataracts, are a leading cause of vision impairment in aging populations.
• Understanding the biochemical changes within the crystalline lens during cataract progression is crucial for developing effective treatments.

Purpose of the Study:

• To investigate the changes in water content, weight, protein, amino acid, and electrolyte levels in the crystalline lens during the maturation of cortical cataracts.
• To compare these biochemical alterations between nuclear and cortical cataracts at various stages of development.

Main Methods:

• Analysis of water content, wet and dry weights of the crystalline lens.
• Quantification of protein, free amino acid, and electrolyte (sodium, potassium) levels in serum, aqueous humor, and the lens.
• Comparison of these parameters in patients with nuclear senile cataract and different stages of cortical cataract maturation.

Main Results:

• Immature cortical cataracts showed higher lens wet weight and sodium, with lower potassium compared to nuclear cataracts.
• As cortical cataracts matured, lens water content, wet weight, and sodium concentration significantly increased.
• Concurrently, protein, free amino acid, and potassium levels in the maturing cortical lens significantly decreased.

Conclusions:

• Lens biochemical composition undergoes significant alterations during cataract maturation, particularly in cortical cataracts.
• Changes in water, sodium, potassium, protein, and amino acid levels are associated with cataract type and progression.
• These findings provide insights into the pathophysiology of different senile cataract forms.