Wnt/β-Catenin and MAPK Signaling: Allies and Enemies in Different Battlefields

Sci. Signal., 10 April 2012
Vol. 5, Issue 219, p. pe15
DOI: 10.1126/scisignal.2002921

Wnt/β-Catenin and MAPK Signaling: Allies and Enemies in Different Battlefields

  1. Daniele Guardavaccaro and
  2. Hans Clevers*
  1. Hubrecht Institute-KNAW and University Medical Center Utrecht, Uppsalalaan 8, 3584 CT Utrecht, Netherlands.
  1. *Corresponding author. E-mail: h.clevers{at}hubrecht.eu

Abstract

Two papers published in Science Signaling reveal extensive crosstalk between Wnt/β-catenin and mitogen-activated protein kinase (MAPK) signaling in cancer. Although both studies describe previously unknown links between these two signaling pathways, the relationship between Wnt/β-catenin and MAPK signaling depends on the specific cellular context. Indeed, in melanoma, hyperactivated MAPK signaling down-regulates the Wnt/β-catenin signal transduction cascade, thereby establishing a negative crosstalk between the two signaling pathways. In contrast, in colorectal cancer, stimulation of the Wnt/β-catenin pathway leads to activation of the MAPK pathway through Ras stabilization, representing an example of positive crosstalk. Moreover, activation of Wnt/β-catenin signaling has context-dependent functions that trigger opposing effects on tumor growth. In melanoma, aberrant activation of Wnt/β-catenin signaling may have anti-oncogenic functions by promoting programmed cell death; by contrast, in the intestine, Wnt/β-catenin signaling drives malignant transformation. Thus, there is no single correct way to target the Wnt/β-catenin pathway for all cancers.

Citation:

D. Guardavaccaro and H. Clevers, Wnt/β-Catenin and MAPK Signaling: Allies and Enemies in Different Battlefields. Sci. Signal. 5, pe15 (2012).

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