Contextual signaling in cancer.
The formation and maintenance of an organism are highly dependent on the orderly control of cell growth, differentiation, death, and migration. These processes are tightly regulated by signaling cascades in which a limited number of molecules dictate these cellular events. While these signaling pathways are highly conserved across species and cell types, the functional outcomes that result from their engagement are specified by the context in which they are activated. Using the Neurofibromatosis type 1 (NF1) cancer predisposition syndrome as an illustrative platform, we discuss how NF1/RAS signaling can create functional diversity at multiple levels (molecular, cellular, tissue, and genetic/genomic). As such, the ability of related molecules (e.g., K-RAS, H-RAS) to activate distinct effectors, as well as cell type- and tissue-specific differences in molecular composition and effector engagement, generate numerous unique functional effects. These variations, coupled with a multitude of extracellular cues and genomic/genetic changes that each modify the innate signaling properties of the cell, enable precise control of cellular physiology in both health and disease. Understanding these contextual influences is important when trying to dissect the underlying pathogenic mechanisms of cancer relevant to molecularly-targeted therapeutics.
Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110, United States.
Laura J
LJ
Smithson
Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110, United States.
Corina
C
Anastasaki
Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110, United States.
Ran
R
Chen
Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110, United States.
Joseph A
JA
Toonen
Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110, United States.
Sidney B
SB
Williams
Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110, United States. Electronic address: gutmannd@wustl.edu.
David H
DH
Gutmann
D000818:Animals; D056426:Genetic Loci; D006801:Humans; D008954:Models, Biological; D009154:Mutation / Q000235:genetics; D009369:Neoplasms / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction; D018631:ras Proteins / Q000378:metabolism
D018631:ras Proteins
Astrocyte; Glioma; NF1; Nervous system; Neuron; RAS; mTOR