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(Investigative Ophthalmology and Visual Science. 2005;46:776-781.)
© 2005 by The Association for Research in Vision and Ophthalmology, Inc.
DOI:  10.1167/iovs.04-0787
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Effect of UV-A and UV-B Irradiation on the Metabolic Profile of Aqueous Humor in Rabbits Analyzed by 1H NMR Spectroscopy

May-Britt Tessem,1 Tone F. Bathen,2 Jitka Cejková,3 and Anna Midelfart1

1From the Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway; the 2Cancer Clinic, St. Olav University Hospital, Trondheim, Norway; and the 3Institute of Experimental Medicine, Academy of Sciences of Czech Republic, Prague, Czech Republic.

PURPOSE. This study was conducted to investigate metabolic changes in aqueous humor from rabbit eyes exposed to either UV-A or -B radiation, by using 1H nuclear magnetic resonance (NMR) spectroscopy and unsupervised pattern recognition methods.

METHODS. Both eyes of adult albino rabbits were irradiated with UV-A (366 nm, 0.589 J/cm2) or UV-B (312 nm, 1.667 J/cm2) radiation for 8 minutes, once a day for 5 days. Three days after the last irradiation, samples of aqueous humor were aspirated, and the metabolic profiles analyzed with 1H NMR spectroscopy. The metabolic concentrations in the exposed and control materials were statistically analyzed and compared, with multivariate methods and one-way ANOVA.

RESULTS. UV-B radiation caused statistically significant alterations of betaine, glucose, ascorbate, valine, isoleucine, and formate in the rabbit aqueous humor. By using principal component analysis, the UV-B–irradiated samples were clearly separated from the UV-A–irradiated samples and the control group. No significant metabolic changes were detected in UV-A–irradiated samples.

CONCLUSIONS. This study demonstrates the potential of using unsupervised pattern recognition methods to extract valuable metabolic information from complex 1H NMR spectra. UV-B irradiation of rabbit eyes led to significant metabolic changes in the aqueous humor detected 3 days after the last exposure.




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M.-B. Tessem, T. F. Bathen, S. Lofgren, O. Saether, V. Mody, L. Meyer, X. Dong, P. G. Soderberg, and A. Midelfart
Biological Response in Various Compartments of the Rat Lens after In Vivo Exposure to UVR-B Analyzed by HR-MAS 1H NMR Spectroscopy
Invest. Ophthalmol. Vis. Sci., December 1, 2006; 47(12): 5404 - 5411.
[Abstract] [Full Text] [PDF]


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