Feedback regulation of endothelial cell surface plasmin generation by PKC-dependent phosphorylation of annexin A2

Kai Li He, Guangzhi Sui, Huabao Xiong, M. Johan Broekman, Bihui Huang, Aaron J. Marcus, Katherine A. Hajjar

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

In response to blood vessel injury, hemostasis is initiated by platelet activation, advanced by thrombin generation, and tempered by fibrinolysis. The primary fibrinolytic protease, plasmin, can be activated either on a fibrin-containing thrombus or on cells. Annexin A2 (A2) heterotetramer (A2·p11)2 is a key profibrinolytic complex that assembles plasminogen and tissue plasminogen activator and promotes plasmin generation. We now report that, in endothelial cells, plasmin specifically induces activation of conventional PKC, which phosphorylates serine 11 and serine 25 of A2, triggering dissociation of the (A2·p11)2 tetramer. The resulting free p11 undergoes ubiquitinmediated proteasomal degradation, thus preventing further translocation of A2 to the cell surface. In vivo, pretreatment of A2+/+ but not A2-/- mice with a conventional PKC inhibitor significantly reduced thrombosis in a carotid artery injury model. These results indicate that augmentation of fibrinolytic vascular surveillance by blockade of serine phosphorylation is A2-dependent. We also demonstrate that plasmin-induced phosphorylation of A2 requires both cleavage of A2 and activation of Toll-like receptor 4 on the cell surface. We propose that plasmin can limit its own generation by triggering a finely tuned "feedback" mechanism whereby A2 becomes serine-phosphorylated, dissociates from p11, and fails to translocate to the cell surface.

Original languageEnglish (US)
Pages (from-to)15428-15439
Number of pages12
JournalJournal of Biological Chemistry
Volume286
Issue number17
DOIs
StatePublished - Apr 29 2011

Fingerprint

Annexin A2
Phosphorylation
Fibrinolysin
Endothelial cells
varespladib methyl
Endothelial Cells
Serine
Feedback
Chemical activation
Toll-Like Receptor 4
Plasminogen
Blood vessels
Tissue Plasminogen Activator
Platelets
Fibrin
Blood Vessels
Thrombin
Thrombosis
Peptide Hydrolases
Carotid Artery Injuries

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Cite this

He, K. L., Sui, G., Xiong, H., Broekman, M. J., Huang, B., Marcus, A. J., & Hajjar, K. A. (2011). Feedback regulation of endothelial cell surface plasmin generation by PKC-dependent phosphorylation of annexin A2. Journal of Biological Chemistry, 286(17), 15428-15439. https://doi.org/10.1074/jbc.M110.185058

Feedback regulation of endothelial cell surface plasmin generation by PKC-dependent phosphorylation of annexin A2. / He, Kai Li; Sui, Guangzhi; Xiong, Huabao; Broekman, M. Johan; Huang, Bihui; Marcus, Aaron J.; Hajjar, Katherine A.

In: Journal of Biological Chemistry, Vol. 286, No. 17, 29.04.2011, p. 15428-15439.

Research output: Contribution to journalArticle

He, Kai Li ; Sui, Guangzhi ; Xiong, Huabao ; Broekman, M. Johan ; Huang, Bihui ; Marcus, Aaron J. ; Hajjar, Katherine A. / Feedback regulation of endothelial cell surface plasmin generation by PKC-dependent phosphorylation of annexin A2. In: Journal of Biological Chemistry. 2011 ; Vol. 286, No. 17. pp. 15428-15439.
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