Preclinical Development of Novel Rac1-GEF Signaling Inhibitors using a Rational Design Approach in Highly Aggressive Breast Cancer Cell Lines

Author(s): Georgina A. Cardama, Maria J. Comin, Leandro Hornos, Nazareno Gonzalez, Lucas Defelipe, Adrian G. Turjanski, Daniel F. Alonso, Daniel E. Gomez, Pablo Lorenzano Menna

Journal Name: Anti-Cancer Agents in Medicinal Chemistry
(Formerly Current Medicinal Chemistry - Anti-Cancer Agents)

Volume 14 , Issue 6 , 2014

Become EABM
Become Reviewer
Call for Editor


Rho GTPases play a key role in the regulation of multiple essential cellular processes, including actin dynamics, gene transcription and cell cycle progression. Aberrant activation of Rac1, a member of Rho family of small GTPases, is associated with tumorigenesis, cancer progression, invasion and metastasis. Particularly, Rac1 is overexpressed and hyperactivated in highly aggressive breast cancer. Thus, Rac1 appears to be a promising and relevant target for the development of novel anticancer drugs. We identified the novel Rac1 inhibitor ZINC69391 through a docking-based virtual library screening targeting Rac1 activation by GEFs. This compound was able to block Rac1 interaction with its GEF Tiam1, prevented EGF-induced Rac1 activation and inhibited cell proliferation, cell migration and cell cycle progression in highly aggressive breast cancer cell lines. Moreover, ZINC69391 showed an in vivo antimetastatic effect in a syngeneic animal model. We further developed the novel analog 1A-116 by rational design and showed to be specific and more potent than the parental compound in vitro and interfered Rac1-P-Rex1 interaction. We also showed an enhanced in vivo potency of 1A-116 analog. These results show that we have developed novel Rac1 inhibitors that may be used as a novel anticancer therapy.

Keywords: Breast cancer, docking, Rac1 inhibitor, rational design, virtual screening.

open access plus

Rights & PermissionsPrintExport Cite as

Article Details

Year: 2014
Page: [840 - 851]
Pages: 12
DOI: 10.2174/18715206113136660334

Article Metrics

PDF: 100