Mitogen-activated protein kinase signaling pathway components (MAPK signaling pathway)

The Mitogen-Activated Protein Kinase (MAPK) signaling pathway is a fundamental intracellular network that converts extracellular stimuli, such as growth factors, hormones, and environmental stress, into specific cellular responses. It typically operates through a three-tiered kinase cascade: a MAP kinase kinase kinase (MAP3K/Raf), a MAP kinase kinase (MAP2K/MEK), and the terminal MAP kinase (MAPK/ERK, JNK, or p38). This pathway is a central regulator of cell cycle progression, differentiation, and survival (Pearson et al., 2001, Endocrine Reviews). Dysregulation of MAPK signaling, frequently caused by gain-of-function mutations in upstream components like BRAF or KRAS, is a primary driver in many human cancers, including melanoma and colorectal cancer (Davies et al., 2002, Nature). Consequently, components of this pathway are major therapeutic targets, with several MEK and BRAF inhibitors currently FDA-approved for oncology indications. However, clinical utility is often limited by the rapid development of drug resistance and significant systemic toxicities (Sun et al., 2015, Nature Reviews Cancer).

Other names

MAP kinase pathwayMAPK cascadeERK/JNK/p38 pathwaysRas-Raf-MEK-ERK pathway

Inhibition of kinase catalytic activity through ATP-competitive binding or allosteric modulation, preventing the sequential phosphorylation of downstream substrates in the signaling cascade.