MAP3K8 is a mitogen-activated protein kinase kinase kinase that plays crucial roles in inflammatory responses and cellular signaling. The protein functions as a key regulator in immune cell activation, particularly in macrophages where it mediates lipopolysaccharide-induced activation of the MAPK/ERK pathway and promotes TNF production during immune responses 1. MAP3K8 activates downstream signaling cascades including JNK and ERK pathways, which regulate inflammatory cytokine expression such as IL-8 and promote immune cell recruitment 1. In disease contexts, MAP3K8 demonstrates significant pathological relevance. Elevated MAP3K8 expression has been identified as a peripheral blood biomarker for osteoarthritis, particularly in elderly patients, where it correlates with immune cell infiltration and inflammatory processes 2. The protein is also implicated in HTLV-1-associated myelopathy (HAM), where chr10 remodeling enhances MAP3K8 expression, driving Th1-like cell differentiation and chr10 inflammation through sustained MEK-ERK signaling activation 3. Additionally, MAP3K8 contributes to hepatocellular carcinoma progression by promoting cell proliferation, metastasis, and macrophage recruitment 1. Clinically, MAP3K8's involvement in the MEK-ERK signaling axis makes it a potential therapeutic target, with MEK inhibitors showing promise in suppressing MAP3K8-mediated inflammatory pathogenesis 3.