ACTR2

ACTR2 Full Name

ARP2 actin-related protein 2 homolog (yeast)

ACTR2 Introduction

ACTR2 (ARP2 actin-related protein 2 homolog) is a core component of the actin-related protein 2/3 (ARP2/3) complex, a highly conserved actin nucleation machinery responsible for generating branched actin networks in eukaryotic cells. For researchers investigating cytoskeletal regulation, cell migration, or disease-associated signaling pathways, ACTR2 represents an important molecular node because it directly controls the formation of dynamic actin structures required for membrane remodeling, intracellular trafficking, and cellular adaptation. As one of the two actin-related subunits of the ARP2/3 complex together with ACTR3, ACTR2 contributes to the initiation of new actin filament branches by stabilizing the nucleation process, allowing cells to rapidly reorganize their cytoskeleton in response to extracellular signals. This function makes ACTR2 essential for fundamental biological processes including cell motility, endocytosis, vesicle transport, cytokinesis, and tissue development.

Beyond its classical role in cytoskeletal organization, ACTR2 has increasingly been recognized as a regulator involved in pathological processes where abnormal actin remodeling drives disease progression. The ARP2/3 complex is frequently exploited by viruses to facilitate host cell invasion, replication, and cell-to-cell transmission. For example, respiratory viruses such as respiratory syncytial virus (RSV) can manipulate ARP2/3-mediated actin polymerization to induce membrane protrusions and promote viral spread, highlighting ACTR2-associated actin regulation as a potential target for antiviral strategies. In cancer biology, dysregulated ACTR2 expression has been linked to tumor development and aggressive phenotypes. Studies have reported that ACTR2 is upregulated in diffuse large B-cell lymphoma (DLBCL), where increased ACTR2 activity enhances malignant behavior through activation of Wnt signaling pathways. These findings suggest that ACTR2 may serve as a potential biomarker or therapeutic target for cancers characterized by uncontrolled cell proliferation, invasion, and abnormal cytoskeletal remodeling.

Emerging research also indicates that ACTR2 functions beyond the cytoplasm, participating in specialized cellular signaling networks and nuclear processes. In thyroid cancer, ACTR2 and other ARP2/3 complex components have been identified as interacting partners of oncogenic BRAFV600E, contributing to tumor aggressiveness and resistance to targeted therapies. In reproductive biology, ACTR2-mediated actin remodeling has been implicated in oocyte maturation, asymmetric cell division, spindle positioning, and early embryonic development, emphasizing its broad physiological importance. Because ACTR2 regulates essential mechanisms connecting extracellular signals with intracellular structural changes, continued investigation of ACTR2 may provide valuable insights into cancer progression, viral infection, developmental disorders, and other diseases associated with impaired cellular dynamics. Understanding ACTR2 activity and regulation could support the development of novel therapeutic approaches targeting actin-dependent disease mechanisms.

Alternate Names for ACTR2

ACTR2; ARP2 actin-related protein 2 homolog (yeast); ARP2; actin-related protein 2; actin-like protein 2;

• 1.Paluck A, et al.; Role of ARP2/3 Complex-Driven Actin Polymerization in RSV Infection. Pathogens. 2021, 11(1):26.
  2.Chen D, Jiang L. Upregulation of Actin-Related Protein 2 (ACTR2) Exacerbated the Malignancy of Diffuse Large B-Cell Lymphoma through Activating Wnt Signaling. Comput Math Methods Med. 2022, 2022:9351921.