Mitogen-activated protein kinase kinase kinase kinase 4 (MAP4K4) and the MAP4K family (MAP4K4 and MAP4K family)

Mitogen-activated protein kinase kinase kinase kinase 4 (MAP4K4) is a serine/threonine kinase belonging to the Ste20-like protein kinase family, specifically the GCK-IV subfamily [1, 2]. It acts as a critical upstream regulator of several signaling pathways, including the c-Jun N-terminal kinase (JNK), p38, Hippo, and Notch cascades, thereby influencing cell migration, adhesion, proliferation, and apoptosis [1, 7, 20]. MAP4K4 is essential for embryonic development, and its genetic deletion in mice is lethal due to impaired mesodermal and somite development [1, 6]. In human disease, MAP4K4 is frequently overexpressed in various malignancies, such as pancreatic, colorectal, and glioblastoma cancers, where it promotes tumor invasion and metastasis [1, 6, 15]. Beyond oncology, it plays significant roles in metabolic disorders like type 2 diabetes by regulating insulin sensitivity and in cardiovascular diseases by modulating endothelial permeability and inflammation [13, 20]. Therapeutic strategies focus on small-molecule inhibitors, such as PF-06260933, DMX-5804, and GNE-495, which aim to block its kinase activity to treat cancer and metabolic conditions [7, 10, 17]. However, drug development faces challenges due to the target's essential role in normal physiology, including immune regulation and glucose homeostasis, which necessitates high selectivity to avoid systemic toxicity and adverse effects like tachycardia or inflammation [6, 13, 16].

Other names

Hematopoietic progenitor kinase/germinal center kinase-like kinase (HGK)Nck interacting kinase (NIK)Ste20-like kinaseMAP4K1 (Hematopoietic progenitor kinase 1, HPK1)MAP4K2 (Germinal center kinase, GCK)MAP4K3 (Germinal center kinase-like kinase, GLK)MAP4K5 (Kinase homologous to Ste20, KHS)MAP4K6 (Misshapen-like kinase 1, MINK1)MAP4K7 (TRAF2 and NCK-interacting kinase, TNIK)

Inhibition of kinase activity through ATP-competitive binding, leading to the suppression of downstream signaling cascades such as JNK, p38, and Hippo pathways, thereby reducing cell motility, proliferation, and inflammatory cytokine production [1, 7, 17].