Mitogen-activated protein kinase (MAPK) and Janus kinase-signal transducer and activator of transcription (JAK-STAT) signaling pathways (MAPK and JAK-STAT pathways)

The Mitogen-activated protein kinase (MAPK) and Janus kinase-signal transducer and activator of transcription (JAK-STAT) pathways are fundamental intracellular signaling networks that mediate cellular responses to external stimuli such as cytokines, growth factors, and environmental stress (Source: NIH, StatPearls). The MAPK pathway typically functions through a three-tier kinase module (Raf-MEK-ERK) that translates extracellular signals into cellular growth, survival, and differentiation responses (Source: Nature Reviews Molecular Cell Biology). In contrast, the JAK-STAT pathway provides a direct mechanism for cytokine receptors to influence gene expression via the phosphorylation and nuclear translocation of STAT transcription factors (Source: PubMed). Both pathways are central to the pathogenesis of chronic inflammatory conditions, autoimmune diseases, and various malignancies when they become constitutively active or dysregulated (Source: Wikipedia). Consequently, numerous small-molecule inhibitors have been developed to target specific kinases within these pathways, such as JAK inhibitors for rheumatoid arthritis and MEK inhibitors for melanoma, providing significant therapeutic benefits (Source: FDA). However, because these pathways are essential for normal immune surveillance and hematopoiesis, their systemic inhibition can lead to notable safety concerns, including immunosuppression and hematologic abnormalities (Source: PubChem).

Other names

MAPK signaling pathwayJAK-STAT signaling pathwayMAPK/ERK cascadeJAK-STAT cascadeInflammatory signaling cascades

Inhibition of intracellular kinase activity (specifically Janus kinases or Mitogen-activated protein kinases) to prevent the phosphorylation of downstream substrates, thereby blocking the nuclear translocation of transcription factors and the subsequent expression of pro-inflammatory and proliferative genes.