Dual specificity protein phosphatase 5 (DUSP5)

Dual specificity protein phosphatase 5 (DUSP5) is a nuclear enzyme encoded by the DUSP5 gene in humans[1][3]. It belongs to the family of dual specificity phosphatases, which inactivate kinases by removing phosphate groups from both phosphotyrosine and phosphoserine/threonine residues[1][3][5]. DUSP5 is highly specific for dephosphorylating and inactivating extracellular signal-regulated kinases 1 and 2 (ERK1/2), key components of the mitogen-activated protein kinase (MAPK) pathway that regulate cell proliferation, differentiation, survival, and gene expression[1][2][3][5][8]. DUSP5 acts predominantly in the nucleus and plays a key role in negative feedback regulation of ERK signaling, thereby controlling cellular proliferation and differentiation and imparting tumor-suppressor properties[3][4][7][10]. It also modulates immune responses, inflammation, and is essential for T cell survival[4][7][8]. Altered expression or function of DUSP5 has been implicated in cancer, immune dysfunction, inflammatory conditions, and potentially neurodegenerative diseases[4][7][8][10]. As of now, there are no approved drugs specifically targeting DUSP5, but it remains of interest, especially in oncology and immunology research[3][7][8][10].

Other names

Dual specificity phosphatase 5VH3HVH3Dual specificity protein phosphatase hVH3DUSPVH1-like phosphatase 3Serine/threonine-specific protein phosphatase

Pharmacological inhibition or modulation would act by altering the enzyme’s phosphatase activity, thereby affecting ERK1/2 phosphorylation status and the downstream MAPK signaling cascade[2][5].