Abstract:
:The notion of feedback is fundamental for understanding signal transduction networks. Feedback loops attenuate or amplify signals, change the network dynamics and modify the input-output relationships between the signal and the target. Negative feedback provides robustness to noise and adaptation to perturbations, but as a double-edged sword can prevent effective pathway inhibition by a drug. Positive feedback brings about switch-like network responses and can convert analog input signals into digital outputs, triggering cell fate decisions and phenotypic changes. We show how a multitude of protein-protein interactions creates hidden feedback loops in signal transduction cascades. Drug treatments that interfere with feedback regulation can cause unexpected adverse effects. Combinatorial molecular interactions generated by pathway crosstalk and feedback loops often bypass the block caused by targeted therapies against oncogenic mutated kinases. We discuss mechanisms of drug resistance caused by network adaptations and suggest that development of effective drug combinations requires understanding of how feedback loops modulate drug responses.
journal_name
Semin Cell Dev Bioljournal_title
Seminars in cell & developmental biologyauthors
Nguyen LK,Kholodenko BNdoi
10.1016/j.semcdb.2015.09.024subject
Has Abstractpub_date
2016-02-01 00:00:00pages
85-94eissn
1084-9521issn
1096-3634pii
S1084-9521(15)00184-6journal_volume
50pub_type
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journal_title:Seminars in cell & developmental biology
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