FHL2 interacts with both ADAM-17 and the cytoskeleton and regulates ADAM-17 localization and activity

Journal of Cellular Physiology
Matthias CanaultFranck Peiretti

Abstract

ADAM-17 is a metalloprotease-disintegrin responsible for the ectodomain shedding of several transmembrane proteins. Using the yeast two-hybrid system, we showed that ADAM-17 interacts with the Four and Half LIM domain 2 protein (FHL2), a LIM domain protein that is involved in multiple protein-protein interaction. We demonstrated that this interaction involved the amino-acid sequence of ADAM-17 from position 721 to739. In the cardiomyoblast cells H9C2, ADAM-17 and FHL2 colocalize with the actin-based cytoskeleton and we showed that FHL2 binds both ADAM-17 and the actin-based cytoskeleton. We found that mainly the mature form of ADAM-17 associates with the cytoskeleton, although the maturation of ADAM-17 by furin is not necessary for its binding to the cytoskeleton. Interestingly, less ADAM-17 was detected at the surface of wild-type mouse macrophages compared to FHL2 deficient macrophages. However, wild-type cells have a higher ability to release ADAM-17 substrates under PMA stimulation. Altogether, these results demonstrate a physical and functional interaction between ADAM-17 and FHL2 that implies that FHL2 has a role in the regulation of ADAM-17.

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