ADAM12 localizes with c-Src to actin-rich structures at the cell periphery and regulates Src kinase activity

作者：Stautz Dorte; Sanjay Archana; Hansen Matilde Tye; Albrechtsen Reidar; Wewer Ulla M; Kveiborg Marie^*

来源：Experimental Cell Research, 2010, 316(1): 55-67.

DOI：10.1016/j.yexcr.2009.09.017

• ADAM12
• Src
• Phosphorylation
• Subcellular localization

ADAM12 is an active metalloprotease playing an important role in tumour progression. Human ADAM12 exists in two splice variants: a long transmembrane form, ADAM12-L, and a secreted form, ADAM12-S. The subcellular localization of ADAM12-L is tightly regulated and involves intracellular interaction partners and signalling proteins. We demonstrate here a c-Src-dependent redistribution of ADAM12-L from perinuclear areas to actin-rich Src-positive structures at the cell periphery, and identified two separate c-Src binding sites in the cytoplasmic tail of ADAM12-L that interact with the SH3 domain of c-Src with different binding affinities. The association between ADAM12-L and c-Src is transient, but greatly stabilized when the c-Src kinase activity is disrupted. In agreement with this observation, kinase-active forms of c-Src induce ADAM12-L tyrosine phosphorylation. interestingly, ADAM12-L was also found to enhance Src kinase activity in response to external signals, such as integrin engagement. Thus, we suggest that activated c-Src binds, phosphorylates, and redistributes ADAM12-L to specific sites at the cell periphery, which may in turn promote signalling mechanisms regulating cellular processes with importance in cancer.

• 出版日期2010-1-1