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B for
suppression of apoptosis in ventricular myocytes
Faculty of Medicine, Department of Physiology, Institute of Cardiovascular Sciences, St. Boniface General Hospital Research Centre, University of Manitoba, Winnipeg, Manitoba, Canada R2H 2A6
Nuclear factor-
B
(NF-
B) is a ubiquitously expressed cellular factor regulated by the
cytoplasmic factor inhibitor protein
B
(I
B
). Activation of
NF-
B by cytokines, including tumor necrosis factor-
(TNF-
),
requires the phosphorylation and degradation of I
B
. An
anti-apoptotic role for NF-
B has recently been suggested. In
the present study, we ascertained whether death-promoting signals and
apoptosis mediated by TNF-
are suppressed by NF-
B in postnatal ventricular myocytes. Stimulation of myocytes with TNF-
resulted in
a 12.1-fold increase (P < 0.01) in NF-
B-dependent
gene transcription and DNA binding compared with controls. This was
accompanied by a corresponding increase in the NF-
B target protein
A20 as determined by Western blot analysis. Vital staining revealed
that TNF-
was not cytotoxic to myocytes and did not provoke
apoptosis. Adenovirus-mediated delivery of a nonphosphorylatable form
of I
B
to inactivate NF-
B prevented TNF-
-stimulated
NF-
B-dependent gene transcription and nuclear NF-
B DNA binding.
Importantly, myocytes stimulated with TNF-
and defective for NF-
B
activation resulted in a 2.2-fold increase (P < 0.001)
in apoptosis. To our knowledge, the data provide the first indication
that a functional NF-
B signaling pathway is crucial for suppressing
death-promoting signals mediated by TNF-
in ventricular myocytes.
adenovirus; inflammation; cytokines; heart failure
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