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Mannose Induces an Endonuclease Responsible for DNA Laddering in
Plant Cells
Joshua C. Stein1 and
Geneviève Hansen*
Novartis Agribusiness Biotechnology Research, 3054 Cornwallis Road,
Research Triangle Park, Durham, North Carolina 27709
The effect of D-mannose
(Man) on plant cells was studied in two different systems: Arabidopsis
roots and maize (Zea mays) suspension-cultured cells. In
both systems, exposure to D-Man was associated with a
subset of features characteristic of apoptosis, as assessed by
oligonucleosomal fragmentation and microscopy analysis. Furthermore,
D-Man induced the release of cytochrome c
from mitochondria. The specificity of D-Man was evaluated
by comparing the effects of diastereomers such as L-Man,
D-glucose, and D-galactose. Of these
treatments, only D-Man caused a reduction in final fresh weight with concomitant oligonucleosomal fragmentation. Man-induced DNA
laddering coincided with the activation of a DNase in maize cytosolic
extracts and with the appearance of single 35-kD band detected using an
in-gel DNase assay. The DNase activity was further confirmed by using
covalently closed circular plasmid DNA as a substrate. It appears that
D-Man, a safe and readily accessible compound, offers
remarkable features for the study of apoptosis in plant cells.
1
Present address: Cereon Genomics, 270 Albany
Street, Cambridge, MA 02139.
*
Corresponding author; e-mail
Genevieve.Hansen{at}NABRI.Novartis.com; fax 919-541-8585.
Plant Physiol. (1999) 121: 71-80
Copyright Clearance Center: 0032-0889/99/121//10
© 1999 American Society of Plant Physiologists
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