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2017 ; 7
(1
): 15926
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Information processing in the NF-?B pathway
#MMPMID29162874
Tudelska K
; Markiewicz J
; Kocha?czyk M
; Czerkies M
; Prus W
; Korwek Z
; Abdi A
; B?o?ski S
; Ka?mierczak B
; Lipniacki T
Sci Rep
2017[Nov]; 7
(1
): 15926
PMID29162874
show ga
The NF-?B pathway is known to transmit merely 1?bit of information about stimulus
level. We combined experimentation with mathematical modeling to elucidate how
information about TNF concentration is turned into a binary decision. Using
Kolmogorov-Smirnov distance, we quantified the cell's ability to discern 8 TNF
concentrations at each step of the NF-?B pathway, to find that input
discernibility decreases as signal propagates along the pathway. Discernibility
of low TNF concentrations is restricted by noise at the TNF receptor level,
whereas discernibility of high TNF concentrations it is restricted by
saturation/depletion of downstream signaling components. Consequently, signal
discernibility is highest between 0.03 and 1 ng/ml TNF. Simultaneous exposure to
TNF or LPS and a translation inhibitor, cycloheximide, leads to prolonged NF-?B
activation and a marked increase of transcript levels of NF-?B inhibitors, I?B?
and A20. The impact of cycloheximide becomes apparent after the first peak of
nuclear NF-?B translocation, meaning that the NF-?B network not only relays 1?bit
of information to coordinate the all-or-nothing expression of early genes, but
also over a longer time course integrates information about other stimuli. The
NF-?B system should be thus perceived as a feedback-controlled decision-making
module rather than a simple information transmission channel.