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Stabilization of physical RAF/14-3-3 interaction by cotylenin A as treatment strategy for RAS mutant cancers.

Abstract：

:One-third of all human cancers harbor somatic RAS mutations. This leads to aberrant activation of downstream signaling pathways involving the RAF kinases. Current ATP-competitive RAF inhibitors are active in cancers with somatic RAF mutations, such as BRAF(V600) mutant melanomas. However, they paradoxically promote the growth of RAS mutant tumors, partly due to the complex interplay between different homo- and heterodimers of A-RAF, B-RAF, and C-RAF. Based on pathway analysis and structure-guided compound identification, we describe the natural product cotylenin-A (CN-A) as stabilizer of the physical interaction of C-RAF with 14-3-3 proteins. CN-A binds to inhibitory 14-3-3 interaction sites of C-RAF, pSer233, and pSer259, but not to the activating interaction site, pSer621. While CN-A alone is inactive in RAS mutant cancer models, combined treatment with CN-A and an anti-EGFR antibody synergistically suppresses tumor growth in vitro and in vivo. This defines a novel pharmacologic strategy for treatment of RAS mutant cancers.

journal_name

ACS Chem Biol

journal_title

ACS chemical biology

authors

Molzan M,Kasper S,Röglin L,Skwarczynska M,Sassa T,Inoue T,Breitenbuecher F,Ohkanda J,Kato N,Schuler M,Ottmann C

doi

10.1021/cb4003464

subject

Has Abstract

pub_date

2013-09-20 00:00:00

pages

1869-75

issue

9

eissn

1554-8929

issn

1554-8937

journal_volume

8

pub_type

杂志文章

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