Proviral integration site for Moloney murine leukemia virus kinase (Pim kinase) (Pim kinase)

The Proviral integration site for Moloney murine leukemia virus (Pim) kinases are a family of three highly conserved serine/threonine kinases (Pim-1, Pim-2, and Pim-3) that function as critical downstream effectors of the JAK/STAT signaling pathway (UniProt). Unlike most kinases that require phosphorylation for activation, Pim kinases are constitutively active upon translation, meaning their activity is primarily regulated by their cellular abundance and protein stability (PubMed). They play a vital role in promoting cell survival and proliferation by phosphorylating substrates such as the pro-apoptotic protein BAD and cell cycle inhibitors like p21 and p27 (NIH). In many cancers, particularly hematologic malignancies like multiple myeloma and acute myeloid leukemia, Pim kinases are overexpressed and contribute to tumor growth and resistance to chemotherapy (Nature Reviews Cancer). Because the three isoforms have overlapping biological functions, therapeutic strategies focus on "pan-Pim" inhibitors to achieve comprehensive blockade and prevent compensatory signaling (ClinicalTrials.gov). While these inhibitors have shown promise in clinical trials, their development has been complicated by dose-limiting toxicities, leading to a shift toward combination therapies with other targeted agents (Journal of Medicinal Chemistry).

Other names

Pim family kinasesPIM1/2/3Serine/threonine-protein kinase pim-1Serine/threonine-protein kinase pim-2Serine/threonine-protein kinase pim-3Pan-Pim

ATP-competitive inhibition of the Pim-1, Pim-2, and Pim-3 kinase isoforms, preventing the phosphorylation of downstream substrates involved in cell survival and cycle progression.