MAP4K4/HGK

MAP4K4/HGK is a human STE20-related serine/threonine kinase that specifically activates the c-Jun N-terminal kinase (JNK) pathway[1]. Mechanistically, the related Nck-interacting kinase (NIK) form binds NCK and MEKK1 and activates the SAPK/JNK cascade through a conserved regulatory domain[2]. Therefore, MAP4K4/HGK provides a kinase node connecting adaptor proteins, MAPK signaling, and stress-responsive transcriptional programs[1][2]. In endothelial models, MAP4K4 regulates integrin-FERM binding and controls endothelial cell motility, linking this kinase to adhesion remodeling and vascular migration assays[3]. In tumor-cell screening, MAP4K4 was identified as a promigratory kinase, supporting its use in invasion, migration, and metastasis-related experimental designs[4]. In inflammatory and metabolic models, TNF-α stimulates Map4k4 expression through TNFR1, c-Jun, and ATF2 signaling, and MAP4K4 gene silencing in human skeletal muscle prevents TNF-α-induced insulin resistance[5][6]. In immune-metabolic disease models, HGK/MAP4K4 deficiency stabilizes TRAF2, promotes Th17 differentiation, and leads to insulin resistance[7]. Compared with related MAP4K4 isoforms, colorectal cancer studies show that the RBM4-SRSF3-MAP4K4 splicing cascade modulates metastatic signatures, and MAP4K4 isoform levels correlate with migration and invasion[8]. For experimental applications, GNE-495 is a potent and selective MAP4K4 inhibitor with efficacy in retinal angiogenesis, and it impedes pancreatic cancer growth and migration in disease models[9][10].
References: