Apoptosis and Cancer signaling pathways Bcl-2 signaling in cellular apoptosis

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300_12_ED A&C Pathways Card:A4 18/05/2012 11:46 Page 1
Apoptosis and Cancer
signaling pathways
Bcl-2 signaling in cellular apoptosis
p53 signaling in apoptosis and gene transcription
Cellular stress,
Death stimulus
DNA damage
Cellular stress
p53
The bcl-2 family consist of pro- and
anti-apoptotic proteins involved in
intrinsic mitochondrial cell death. They
regulate the release of apoptotic
factors into the cytoplasm including
cytochrome C and Apaf-1, by mediating
outer membrane permeabilisation. This
leads to activation of caspase-9 and
the resulting caspase cascade.
Bcl-2 inhibitors
Caspase 3
Caspase 9
Gene
G
ene rregulation
egulation
eg
n
Bax
Bcl-2
Mitochondria
Apaf-1
Cyt-c
Mitochondria
Apoptosis
Death receptor signaling in apoptosis and gene transcription
Bcl-2
p53 is a critical tumour suppressive
transcription factor which responds to
cellular stress by triggering cell cycle
arrest
and
apoptosis
through
transcriptional regulation.
Cyt-c
Apaf-1/Caspase 9
Cell cycle arrest, cell
growth inhibition,
metabolic stress
inhibition
Apoptosis
Ap
pop
optos
pto
p
pt
to
osis
os
Inhibitors of apoptosis signaling in cellular apoptosis
TRAIL
TNF•
NF-κB Pathway
Apoptosis Pathway
DR4/5
TNFR1 receptors
TNFR
Caspase 8
ReIA
Bid
IIκB•
Smac-mimetic
(SH122)
Death domain
TRADD
Mitochondria
Smac
IκB•
FADD
Death receptors (DRs) belong to
the tumour necrosis factor (TNF)
family of cytokines which induce
apoptosis. These receptors can
activate caspases within seconds
causing apoptosis.
Cyt-c
Pro-caspase 8
BAX
Caspase 3
Degradation
Degr
ad
dation
t
TRAF-2
NF-κB
BID
Apoptosis
IKK
Transcription
Inhibitors of apoptosis (IAPs) are a
conserved group of proteins containing
Baculovirus-IAP repeats involved in the
regulation of apoptosis as well as a
number of other cellular processes.
XIAP
cIAP-1
Cyt-c
NF-κB
Caspase 9
Caspase 3
PARP cleavage
Apoptosis
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300_12_ED A&C Pathways Card:A4 18/05/2012 11:46 Page 2
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