Reference Detail

Ref Type

Journal Article

PMID

(27104980)

Authors

Athuluri-Divakar SK, Vasquez-Del Carpio R, Dutta K, Baker SJ, Cosenza SC, Basu I, Gupta YK, Reddy MV, Ueno L, Hart JR, Vogt PK, Mulholland D, Guha C, Aggarwal AK, Reddy EP

Title

A Small Molecule RAS-Mimetic Disrupts RAS Association with Effector Proteins to Block Signaling.

Journal	Vol	Issue	Date	Pages	Journal Short Title
Cell	165	3	2016 Apr 21	643-55	Cell

URL

Abstract Text

Oncogenic activation of RAS genes via point mutations occurs in 20%-30% of human cancers. The development of effective RAS inhibitors has been challenging, necessitating new approaches to inhibit this oncogenic protein. Functional studies have shown that the switch region of RAS interacts with a large number of effector proteins containing a common RAS-binding domain (RBD). Because RBD-mediated interactions are essential for RAS signaling, blocking RBD association with small molecules constitutes an attractive therapeutic approach. Here, we present evidence that rigosertib, a styryl-benzyl sulfone, acts as a RAS-mimetic and interacts with the RBDs of RAF kinases, resulting in their inability to bind to RAS, disruption of RAF activation, and inhibition of the RAS-RAF-MEK pathway. We also find that ribosertib binds to the RBDs of Ral-GDS and PI3Ks. These results suggest that targeting of RBDs across multiple signaling pathways by rigosertib may represent an effective strategy for inactivation of RAS signaling.

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Molecular Profile	Treatment Approach

Gene Name	Source	Synonyms	Protein Domains	Gene Description	Gene Role

Therapy Name	Drugs	Efficacy Evidence	Clinical Trials

Drug Name	Trade Name	Synonyms	Drug Classes	Drug Description

Gene	Variant	Impact	Protein Effect	Variant Description	Associated with drug Resistance

Molecular Profile	Indication/Tumor Type	Response Type	Therapy Name	Approval Status	Evidence Type	Efficacy Evidence	References
PIK3CA E545K	Advanced Solid Tumor	sensitive	Rigosertib Sodium	Preclinical - Cell culture	Actionable	In a preclinical study, Rigosertib (ON 01910.Na) inhibited oncogenic transformation in fibroblast cells over-expressing PIK3CA E545K in culture (PMID: 27104980).	27104980
HRAS G12V	Advanced Solid Tumor	sensitive	Rigosertib Sodium	Preclinical - Cell culture	Actionable	In a preclinical study, Rigosertib (ON 01910.Na) inhibited oncogenic transformation in fibroblast cells over-expressing HRAS G12V in culture (PMID: 27104980).	27104980
PIK3CA H1047R	Advanced Solid Tumor	sensitive	Rigosertib Sodium	Preclinical - Cell culture	Actionable	In a preclinical study, Rigosertib (ON 01910.Na) inhibited oncogenic transformation in fibroblast cells over-expressing Pik3ca H1047R in culture (PMID: 27104980).	27104980