Monoclonal antibody against α-actinin 4 from human umbilical vein endothelial cells inhibits endothelium-dependent vasorelaxation.

Background: This study was attempted to identify new molecules expressed on the plasma membrane of human umbilical vein endothelial cells (HUVECs) using monoclonal antibody-based proteomics technology and to determine the effect of the identified antibody on vascular reactivity.

Methods: Twenty-two antibodies were developed from rats inoculated with HUVECs, and their effects were determined by observing vascular reactivity.

Results: Among the 22 antibodies, the C-7 antibody significantly inhibited endothelium-dependent vasorelaxation in response to acetylcholine (ACh) but not to histamine.