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J Biol Chem. 2013 May 3;288(18):12712-21. doi: 10.1074/jbc.M113.452383. Epub 2013 Mar 22.

The syndecan-4/protein kinase Cα pathway mediates prostaglandin E2-induced extracellular regulated kinase (ERK) activation in endothelial cells and angiogenesis in vivo.

Author information

1
Yale Cardiovascular Research Center, Section of Cardiovascular Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut 06520, USA.

Abstract

Prostaglandin E2 (PGE2) is regarded as the main mediator of inflammatory symptoms. In addition, it also plays an important role in tumor growth and angiogenesis. In this study, we examined the mechanism of PGE2-induced angiogenic response. We show that in the absence of proteoglycan syndecan-4 (Sdc4), PGE2-induced ERK activation is decreased significantly, as is endothelial cell migration and cord formation in a two-dimensional Matrigel assay. In vivo, PGE2-induced angiogenesis is reduced dramatically in Sdc4(-/-) mice. The mechanism was traced to Sdc4-dependent activation of protein kinase Cα (PKCα). Transduction of an Sdc4 S183E mutant (a cytoplasmic domain mutation that blocks Sdc4-dependent PKCα activation) into Sdc4(-/-) endothelial cells was not able to rescue the loss of PGE2-induced ERK activation, whereas a transduction with full-length Sdc4 resulted in full rescue. Furthermore, PGE2-induced angiogenesis was also reduced in PKCα(-/-) mice. Taken together, these results demonstrate that PGE2-induced activation of angiogenesis is mediated via syndecan-4-dependent activation of PKCα.

KEYWORDS:

Angiogenesis; Cell Signaling; Prostaglandins; Protein Kinase C (PKC); Proteoglycan; Syndecan 4

PMID:
23525101
PMCID:
PMC3642317
DOI:
10.1074/jbc.M113.452383
[Indexed for MEDLINE]
Free PMC Article

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