Transforming protein RhoA and Cell division control protein 42 homolog (RhoA/Cdc42)

RhoA (Transforming protein RhoA) and Cdc42 (Cell division control protein 42 homolog) are key members of the Rho family of small GTPases that function as molecular switches in intracellular signaling [4, 16, 19]. They cycle between an active GTP-bound state and an inactive GDP-bound state, regulated by guanine nucleotide exchange factors (GEFs) and GTPase-activating proteins (GAPs) [2, 7, 16]. RhoA primarily regulates the formation of actin stress fibers and focal adhesions, while Cdc42 is essential for establishing cell polarity and inducing filopodia formation [8, 16, 22]. Together, they coordinate complex cellular processes including migration, cytokinesis, and vesicle trafficking [2, 16]. In disease contexts, particularly cancer, RhoA and Cdc42 are frequently overexpressed or hyperactivated, driving tumor cell invasion, metastasis, and angiogenesis [8, 11, 16]. They also play significant roles in inflammatory responses and cardiovascular development [4, 12, 17]. Therapeutic strategies targeting these proteins include small-molecule inhibitors like MBQ-167, which dual-targets Cdc42 and Rac (a closely related GTPase), and specific inhibitors like Rhosin for RhoA [5, 10, 15, 21]. These drugs aim to disrupt the signaling cascades that promote malignancy, although the essential physiological roles of these GTPases present challenges for achieving therapeutic selectivity and safety [4, 12, 21]. Research continues to explore the potential of dual or pan-Rho GTPase inhibition to overcome resistance and improve efficacy in treating metastatic cancers [6, 11]. Overall, RhoA and Cdc42 represent critical nodes in the signaling networks that govern cell shape and movement, making them high-value targets for drug development [13, 16, 19].

Other names

ARHAARH12RHO12G25KCDC42HsCell division control protein 42 homologTransforming protein RhoA

Inhibition of GTPase activation by blocking guanine nucleotide exchange factors (GEFs) or direct binding to the GTPase to prevent GTP loading, thereby suppressing downstream signaling pathways such as ROCK and PAK [4, 10, 15, 21].