Phosphatase domain containing paladin 1 (PALD1)

Phosphatase domain containing paladin 1 (PALD1), commonly referred to as paladin, is a cytosolic protein with a phosphatase domain that is variably classified as a phosphoinositide phosphatase, pseudo-phosphatase, or signaling adaptor depending on context. PALD1 is evolutionarily conserved and highly expressed in developing and mature vascular cells, with confirmed roles in the regulation of endothelial cell proliferation, migration, and angiogenesis. It modulates receptor signaling, particularly of vascular endothelial growth factor receptor 2 (VEGFR2), controlling receptor internalization, downstream ERK activation, and pathological retinal angiogenesis. PALD1 also participates in cytoskeletal dynamics affecting cancer cell migration and metastasis, especially in colon cancer. Additionally, it has been implicated in processes such as insulin signaling, innate immunity (Toll-like receptor 9 suppression), and neural crest migration. No direct drugs targeting PALD1 have current clinical relevance, but aberrant PALD1 expression or function can lead to significant pathologies in cancer and vascular disorders, as demonstrated by animal knockout models and cancer proteomics.

Other names

PaladinPALD1KIAA1274PALD

Not applicable (no known drugs). Mechanistically, modulation of PALD1 (e.g., by siRNA, gene knockout) affects growth factor receptor trafficking/signaling and cytoskeletal dynamics.