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UV Effect on Human Anterior Lens Capsule Macro-Molecular Composition Studied by Synchrotron-Based FTIR
Xhevat Lumi1, Tanja Dučić2, Martin Kreuzer2
1Eye Hospital, University Medical Centre, 1000 Ljubljana, Slovenia.
Ultraviolet C (UV-C) irradiation alters lens epithelial cells (LECs) by damaging proteins and lipids, contributing to cataract formation. This study reveals specific molecular changes in the lens capsule due to UV-C exposure.
Area of Science:
- Ophthalmology
- Biophysics
- Molecular Biology
Background:
- Ultraviolet (UV) irradiation is a known risk factor for cataractogenesis.
- Lens epithelial cells (LECs) are crucial in UV-induced cataract development.
- Understanding molecular changes in LECs under UV exposure is vital for cataract research.
Purpose of the Study:
- To characterize biomolecular changes (nucleic acids, proteins, lipids) in human UV C-irradiated lens capsules (LCs) with LECs.
- To compare irradiated LCs with non-irradiated controls.
- To elucidate the effects of UV C on lens bio-macromolecules in the context of cataractogenesis.
Main Methods:
- Utilized synchrotron radiation-based Fourier transform infrared (SR-FTIR) micro-spectroscopy.
- Employed the MIRAS beamline at the Spanish synchrotron light source ALBA.
- Achieved single-cell resolution with high spectral stability and photon flux for precise analysis.
Main Results:
- UV C irradiation significantly altered protein conformation, inducing intramolecular parallel β-sheet structures.
- Observed decreased phosphate and carboxyl bands in fatty acids and amino acids.
- Detected markers of oxidative stress, including increased lipid peroxidation and diminished asymmetric CH3 bands.
Conclusions:
- UV C irradiation induces significant molecular alterations in lens epithelial cells and the lens capsule.
- These changes, particularly in protein structure and lipid peroxidation, are implicated in UV-induced cataractogenesis.
- SR-FTIR micro-spectroscopy is effective in identifying subtle molecular damage at the cellular level.
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