Abstract |
Cataracts were induced in suckling mice by multiple injections of L- buthionine-S,R-sulfoximine (BSO), a specific inhibitor of GSH biosynthesis, starting on post-natal day 7. The earliest visible lens aberrations began approximately 2 days after t(o), following 99% depletion of lens GSH. Cataract development then proceeded through four stages within less than 24 hr. Elevated Na+ and Ca+ and decreased K+ were first detected in pre-cataractous (stage 0) lenses. During stage 0, lens Na+ and K+ levels displayed a significant inverse correlation; by contrast, Ca2+ levels were poorly correlated with those of Na+. The initial increase in Na+ exceeded the decrease in K+. This suggested the presence of osmotic stress prior to cataract stage 1 (developing floriform). Increased lens hydration was first apparent in stage 1, coincident with a marked elevation of Ca2+, further increase in Na+ and decrease in K+. These trends persisted in the stage 2 cataract (completed floriform). Subsequent changes in lens hydration and cation content during cataract stages 3 (degenerate floriform) and 4 (amorphous translucent) suggested substantial influx of extracellular fluid into the affected lenses. The BSO cataract may represent a useful in vivo model to study the functions of GSH in maintaining normal lens cation balance and transparency.
|
Authors | H I Calvin, S von Hagen, J L Hess, S A Patel, S C Fu |
Journal | Experimental eye research
(Exp Eye Res)
Vol. 54
Issue 4
Pg. 621-6
(Apr 1992)
ISSN: 0014-4835 [Print] England |
PMID | 1623947
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, P.H.S.)
|
Chemical References |
- Methionine Sulfoximine
- Buthionine Sulfoximine
- Sodium
- Glutathione
- Potassium
- Calcium
|
Topics |
- Animals
- Buthionine Sulfoximine
- Calcium
(metabolism)
- Cataract
(chemically induced, metabolism)
- Female
- Glutathione
(metabolism)
- Lens, Crystalline
(metabolism)
- Male
- Methionine Sulfoximine
(analogs & derivatives)
- Mice
- Mice, Inbred Strains
- Potassium
(metabolism)
- Sodium
(metabolism)
- Time Factors
|