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Related Experiment Videos

Ultraviolet-B effects on ocular tissues

V Babu1, R B Misra, P C Joshi

  • 1Photobiology Laboratory, Industrial Toxicology Research Centre, M.G. Marg, Lucknow, India.

Biochemical and Biophysical Research Communications
|May 16, 1995
PubMed
Summary
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Ultraviolet B (UVB) exposure increases oxidative stress and calcium (Ca++) levels in mice eyes, contributing to cataract formation. This research highlights the role of these factors in photochemically induced cataracts.

Area of Science:

  • Ophthalmology
  • Photobiology
  • Toxicology

Background:

  • Stratospheric ozone depletion enhances UVB radiation reaching Earth's surface.
  • Increased UVB exposure is linked to a higher risk of photochemically induced cataracts.

Purpose of the Study:

  • To investigate the ocular toxicity of UVB exposure.
  • To identify biological markers associated with UVB-induced cataract formation.

Main Methods:

  • Albino mice were exposed to UVB radiation.
  • Levels of hydrogen peroxide (H2O2), lipid peroxidation (LP), inorganic phosphate (Pi), glutathione (GSH), and calcium ions (Ca++) were measured.
  • Measurements were taken in serum, aqueous humor, and the lens.

Main Results:

Related Experiment Videos

  • UVB exposure significantly increased H2O2, LP, and Pi levels.
  • The antioxidant defense system, indicated by GSH, was depleted.
  • Ca++ levels rose in serum and aqueous humor but decreased in the lens.

Conclusions:

  • Oxidative stress plays a critical role in UVB-induced cataractogenesis.
  • Altered calcium homeostasis in the lens is implicated in cataract formation.
  • These findings support the involvement of oxidative stress and Ca++ in the development of cataracts.