Title: Signaling Through RAS-RAF-MEK-ERK: from Basics to Bedside
Volume: 14
Issue: 5
Author(s): Armin Zebisch, Armin P. Czernilofsky, Gyorgy Keri, Julja Smigelskaite, Heinz Sill and Jakob Troppmair
Affiliation:
Keywords:
acute myeloid leukemia, cytoplasmic cascade, guanine nucleotide exchange factors (GEFs), C-RAF, non-receptor protein tyrosine kinase, BAY 43-9006
Abstract: Aberrant signaling caused by mutations in the RAS-RAF-MEK-ERK pathway and its upstream activators critically contributes to human tumor development. Strategies, which aim at inhibiting hyperactive signaling molecules, appear conceptually straight forward, but their translation into clinical practice has been hampered by many setbacks. Understanding structure, function and regulation of this intracellular pathway as well as its crosstalk with other signaling activities in the cell will be essential to ensure reasonable usage of new therapeutic possibilities. This review provides an understanding of this signaling cascade as revealed by genetic and biochemical approaches and discusses the existing or arising possibilities to interfere with unphysiological activation in cancer. Signaling aberrations and signal transduction therapies will be discussed exemplary for two types of hematological neoplasia, acute myeloid leukemia (AML) and the myelodysplastic syndromes (MDS). In the future understanding the role of tumor stem cells, both as a source of tumor recurrence and tumor heterogeneity, the signals controlling their fate as well as epigenetic changes in cancer will be the next critical steps to further advance the applicability of these novel therapeutic strategies.
