The Annexin II-p11 Complex Is Involved in Regulated Exocytosis in Bovine Pulmonary Artery Endothelial Cells*

J. König,J. Prenen,B. Nilius,V. Gerke

Published 1998 in Journal of Biological Chemistry

ABSTRACT

Annexin II is a member of a multigene family of Ca2+-regulated, membrane-binding proteins implicated through biochemical and perforated cell experiments in Ca2+-triggered secretion. Within most cells annexin II resides in a tight heterotetrameric complex with a cellular protein ligand, p11, and complex formation is mediated via the N-terminal 14 residues of annexin II including the N-terminal acetyl group. To analyze at the single cell level whether the annexin II-p11 complex is involved in regulated secretion, we used membrane capacitance measurements to follow exocytotic fusion events in bovine aortic endothelial cells manipulated with respect to their annexin II-p11 complex formation. Upon guanosine 5′-O-(thiotriphosphate) (GTPγS) stimulation, the endothelial cells show a significant increase in membrane capacitance which is generally preceded by a transient rise in intracellular Ca2+ and thus indicative of the occurrence of Ca2+-regulated secretion. The GTPγS-induced capacitance increase is markedly reduced in cells loaded with a synthetic peptide, Ac1–14, which corresponds in sequence to the N-terminal 14 residues of annexin II in their correctly acetylated form and which is capable of disrupting preformed annexin II-p11 complexes. The effect of the peptide is highly specific as the nonacetylated variant, N1–14, which is incapable of disrupting annexin II-p11, does not interfere with the GTPγS-induced increase in membrane capacitance. These data show that intact annexin II-p11 complexes are indispensable for regulated exocytosis to occur in an efficient manner in endothelial cells.

PUBLICATION RECORD

CITATION MAP

EXTRACTION MAP

CLAIMS

  • No claims are published for this paper.

CONCEPTS

  • No concepts are published for this paper.

REFERENCES

Showing 1-44 of 44 references · Page 1 of 1

CITED BY

Showing 1-81 of 81 citing papers · Page 1 of 1