The activity of aminoacyl-tRNA synthetase-interacting multi-functional protein 1 (AIMP1) on endothelial cells is mediated by the assembly of a cytoskeletal protein complex.

AIMP1 was first found as a factor associated with the aminoacyl-tRNA synthetase (ARS) complex. However, it is also secreted and acts on different target cells such as endothelial cells, macrophages, and fibroblasts as an extracellular regulator, respectively, of angiogenesis, inflammatory responses and dermal regeneration. AIMP1 has also been reported to suppress in vivo tumor growth.