Abstract:
: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. In this study, we investigated the signaling pathways activated by exogenous AIMP1 in an in vitro endothelial model. AIMP1 decreases EC viability through an α5β1 integrin-dependent mechanism and inhibits cell adhesion, is internalized and shows an asymmetric pattern of distribution and accumulation in cell protrusions. Experiments of affinity purification, pull down, and co-immunoprecipitation showed that AIMP1 interacts with four cytoskeletal proteins (filamin-A, α-tubulin, vinculin, and cingulin). α-Tubulin also gets phosphorylated upon cell treatment with AIMP1 and colocalization between AIMP1 and filamin-A as well as between AIMP1 and cingulin was observed through immunofluorescence assays. In this work, we propose that AIMP1 effect on EC adhesion is mediated by the assembly of a cytoskeletal protein complex on the cytosolic face of the cell membrane which could regulate cellular architecture maintenance and remodeling. Moreover, this activity is able to indirectly influence cell viability.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Jackson VC,Dewilde S,Albo AG,Lis K,Corpillo D,Canepa Bdoi
10.1002/jcb.23104subject
Has Abstractpub_date
2011-07-01 00:00:00pages
1857-68issue
7eissn
0730-2312issn
1097-4644journal_volume
112pub_type
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