Dual specificity protein phosphatase 6 (DUSP6) (MKP-3)

Dual specificity protein phosphatase 6 (DUSP6), also known as MKP-3, is an enzyme that specifically dephosphorylates the threonine and tyrosine residues of extracellular signal-regulated kinases 1 and 2 (ERK1/2) (UniProt, Q16828). By inactivating ERK, MKP-3 serves as a pivotal negative feedback regulator of the RAS/RAF/MEK/ERK signaling cascade, which is essential for regulating cell proliferation, differentiation, and apoptosis (Camps et al., 2000; PubMed PMID: 11042189). In the context of oncology, DUSP6 expression is often altered; it can function as a tumor suppressor in some tissues, while in others, such as pancreatic and lung cancer, its overexpression is linked to resistance against targeted therapies (Furukawa et al., 2003; PubMed PMID: 12692539). Beyond cancer, MKP-3 is involved in metabolic regulation, where its deficiency has been shown to protect against diet-induced obesity and insulin resistance (Wu et al., 2010; PubMed PMID: 20164305). Pharmacological targeting of MKP-3 has primarily focused on small-molecule inhibitors like BCI, which blocks its phosphatase activity and enhances ERK signaling (Molina et al., 2009; PubMed PMID: 19411067). These inhibitors are currently used as research tools to investigate the therapeutic potential of modulating MAPK signaling in various disease models.

Other names

DUSP6PYST1Mitogen-activated protein kinase phosphatase 3MAP kinase phosphatase 3

Small molecule inhibition of the phosphatase catalytic domain or allosteric sites to prevent the dephosphorylation of ERK1/2, thereby modulating the duration and magnitude of MAPK signaling (Molina et al., 2009).