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Investigative Ophthalmology & Visual Science, Vol 27, 1522-1526, Copyright © 1986 by Association for Research in Vision and Ophthalmology

ARTICLES AND REPORTS

The accumulation of myoinositol and rubidium ions in galactose-exposed rat lens

T Kawaba, HM Cheng and JH Kinoshita

When rat lens is incubated in 30 mM galactose overnight, the extent of accumulation of rubidium ions (Rb) and myoinositol (MI) are affected, as well as the Na-K ATPase activity. Rb accumulation and Na-K ATPase activity are only slightly affected compared to the dramatic drop in MI accumulation. These changes are completely abolished by sorbinil, which blocks polyol formation, or by rendering the galactose medium hypertonic to offset the osmotic effect of polyol formation. On the other hand, the addition of excess MI to the galactose medium had no effect on correcting these changes. The results obtained are consistent with the polyol-osmotic theory of sugar cataract formation.


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P. R. Cammarata, C. Zhou, G. Chen, I. Singh, R. E. Reeves, J. R. Kuszak, and M. L. Robinson
A Transgenic Animal Model of Osmotic Cataract. Part 1: Over-expression of Bovine Na+/Myo-inositol Cotransporter in Lens Fibers
Invest. Ophthalmol. Vis. Sci., July 1, 1999; 40(8): 1727 - 1737.
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Copyright © 1986 by the Association for Research in Vision and Ophthalmology