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J. Biol. Chem., Vol. 275, Issue 47, 36823-36831, November 24, 2000
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From the Departments of
Differential Protective Activity of
A- and
B-crystallin in
Lens Epithelial Cells*
§¶,
,
,
**, and

Ophthalmology and Visual
Sciences, § Biochemistry & Molecular Biophysics, ** Genetics,
and 
Cell Biology and Physiology, Washington
University School of Medicine, St. Louis, Missouri 63110 and the
National Eye Institute, National Institutes of Health, Bethesda,
Maryland 20892
A- and
B-crystallins are molecular
chaperones expressed at low levels in lens epithelial cells, and their
expression increases dramatically during differentiation to lens
fibers. However, the functions of
A- and
B-crystallins in lens
epithelial cells have not been studied in detail. In this study, the
relative ability of
A- and
B-crystallin, in protecting lens
epithelial cells from apoptotic cell death was determined. The
introduction of
A-crystallin in the transformed human lens
epithelial (HLE) B-3 lens epithelial cell line (which expresses low
endogenous levels of
B-crystallin) led to a nearly complete
protection of cell death induced by staurosporine, Fas monoclonal
antibody, or the cytokine tumor necrosis factor
. To further study
the relative protective activities of
A- and
B-crystallins, we
created a cell line derived from
A
/
B
/
double knockout
mouse lens epithelia by infecting primary cells with Ad12-SV40 hybrid
virus. The transformed cell line
A
BKO1 derived from
A/
B
double knockout cells was transfected with
A- or
B-crystallin
cDNA contained in pCIneo mammalian expression vector. Cells
expressing different amounts of either
A-crystallin or
B-crystallin were isolated. The ability of
A- or
B-crystallin
to confer protection from apoptotic cell death was determined by
annexin labeling and flow cytometry of staurosporine- or UVA- treated
cells. The results indicate that the anti-apoptotic activity of
A-crystallin was two to three-fold higher than that of
B-crystallin. Our work suggests that comparing the in
vitro annexin labeling of lens epithelial cells is an effective way to measure the protective activity of
A- and
B-crystallin. Since the expression of
A-crystallin is largely restricted to the
lens, its greater protective effect against apoptosis suggests that it
may play a significant role in protecting lens epithelial cells from stress.
*
This work was supported by National Eye Institutes Grants
R01-EY05681 (to U. P. A.) and EY09852 (to S. B.) and Core Grant EY02687 and by Research to Prevent Blindness, Inc.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
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