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. 1997 Mar;8(3):431–442. doi: 10.1091/mbc.8.3.431

Modification of annexin II expression in PC12 cell lines does not affect Ca(2+)-dependent exocytosis.

M E Graham 1, V Gerke 1, R D Burgoyne 1
PMCID: PMC276095  PMID: 9188096

Abstract

The Ca2+/phospholipid/cytoskeletal-binding protein annexin II has been proposed to play an important role in Ca(2+)-dependent exocytosis; however, the evidence for this role is inconclusive. More direct evidence obtained by manipulating annexin II levels in cells is still required. We have attempted to do this by generating stably transfected PC12 cell lines expressing proteins which elevate or lower functional annexin II levels and using these cell lines to investigate Ca(2+)-dependent exocytosis. Three cell lines were generated: one expressing an annexin II mutant which aggregates annexin II in at least a proportion of the cells, thereby removing functional protein from the cell; a mixed clonal cell line constitutively overexpressing human annexin II; and a clonal cell line capable of over-expressing annexin II in the presence of sodium butyrate. After digitonin permeabilization, Ca(2+)-dependent dopamine release from these cell lines was compared with that from control nontransfected cells, and, in addition, release was compared in induced to uninduced cells. There were no significant differences in Ca(2+)-dependent exocytosis between any of the transfected cell lines before or after induction and the control cells. In addition, nontransfected PC12 cells treated with nerve growth factor, which elevates annexin II levels severalfold, failed to increase Ca(2+)-dependent exocytosis after digitonin permeabilization, compared with control cells. We conclude that annexin II is not an important regulator of Ca(2+)-dependent exocytosis in PC12 cells.

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