Ras homolog family member A (RhoA)

Ras homolog family member A (RhoA) is a small GTPase of the Rho family, functioning as a molecular switch in diverse signal transduction cascades that regulate actin cytoskeleton organization, cell shape, adhesion, and motility[1][4][7]. RhoA alternates between an active GTP-bound state and an inactive GDP-bound state, orchestrating key cellular processes via effectors such as Rho-associated coiled-coil kinase (ROCK) and Diaphanous homolog 1 (DIAPH1)[1][2]. It plays critical roles in cell cycle progression, cytokinesis, polarity, transcription regulation, and cell migration[1][2][4][7]. Deregulation of RhoA activity or expression is implicated in the pathogenesis of several diseases, notably cancer progression and metastasis, cardiac conditions, neural injury, and wound repair. As a drug target, RhoA and its effectors can be modulated by small-molecule inhibitors (e.g., ROCK inhibitors like fasudil) or by bacterial toxins (e.g., C3 exoenzyme), though systemic targeting may present safety challenges due to RhoA’s fundamental roles in multiple normal physiological processes[1][4][7].

Other names

Transforming protein RhoARHOARas homolog gene family, member A

Inhibition of RhoA-mediated actin cytoskeletal remodeling (via downstream effectors such as ROCK); Blockade of RhoA activation (e.g., by bacterial C3 exoenzyme ribosylation of RhoA); Indirect inhibition via upstream receptor modulation (e.g., LINGO1, p75NTR antagonists impacting RhoA pathway)