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J. Cell Biol.,
Volume 140, Number 1, January 12, 1998 153-158


* Department of Hygiene, Kobe University School of Medicine, Chuo-ku, Kobe 650, Japan; and There is increasing evidence that programmed cell death (PCD) depends on a novel family
of intracellular cysteine proteases, called caspases, that
includes the Ced-3 protease in the nematode Caenorhabditis elegans and the interleukin-1
Medical Research Council
Laboratory for Molecular Cell Biology and Biology Department, University College London, London WC1E 6BT,
United Kingdom
-converting
enzyme (ICE)-like proteases in mammals. Some developing cells, including lens epithelial cells, erythroblasts,
and keratinocytes, lose their nucleus and other organelles when they terminally differentiate, but it is not
known whether the enzymatic machinery of PCD is involved in any of these normal differentiation events.
We show here that at least one CPP32 (caspase-3)-like
member of the caspase family becomes activated when
rodent lens epithelial cells terminally differentiate into
anucleate lens fibers in vivo, and that a peptide inhibitor of these proteases blocks the denucleation process
in an in vitro model of lens fiber differentiation. These
findings suggest that at least part of the machinery of
PCD is involved in lens fiber differentiation.
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