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The MARCKS Protein Plays a Critical Role in Phosphatidylinositol 4,5

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The MARCKS Protein Plays a Critical Role in Phosphatidylinositol 4,5 Supplemental Material can be found at: http://www.jbc.org/content/suppl/2010/11/20/M110.196022.DC1.html THE JOURNAL OF BIOLOGICAL CHEMISTRY VOL. 286, NO. 3, pp. 2320–2330, January 21, 2011 © 2011 by The American Society for Biochemistry and Molecular Biology, Inc. Printed in the U.S.A. The MARCKS Protein Plays a Critical Role in Phosphatidylinositol 4,5-Bisphosphate Metabolism and Directed Cell Movement in Vascular Endothelial Cells*□S Received for publication, October 19, 2010, and in revised form, November 16, 2010 Published, JBC Papers in Press, November 20, 2010, DOI 10.1074/jbc.M110.196022 Hermann Kalwa and Thomas Michel1 From the Cardiovascular Medicine Division, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts 02115 The MARCKS protein (myristoylated alanine-rich C kinase MARCKS has been shown to bind reversibly to a broad spec- substrate) is an actin- and calmodulin-binding protein that is trum of important structural and regulatory molecules, in- expressed in many mammalian tissues. The role of MARCKS cluding actin, Ca2ϩ/calmodulin, and the signaling phospho- 2 in endothelial signaling responses is incompletely understood. lipid phosphatidylinositol 4,5-bisphosphate (PIP2) (1). Downloaded from We found that siRNA-mediated knockdown of MARCKS in Phosphorylation of MARCKS leads to its intracellular translo- cultured endothelial cells abrogated directed cell movement in cation, associated with a decrease in calmodulin and PIP2 a wound healing assay. We used biochemical and cell imaging binding; MARCKS phosphorylation also promotes its interac- approaches to explore the role of MARCKS in endothelial sig- tions with actin and actin-binding proteins. The actin-binding nal transduction pathways activated by insulin. Insulin treat- properties of MARCKS have been implicated in control of cell ment of vascular endothelial cells promoted the dose- and adhesion and motility (2), yet much less is known about the www.jbc.org time-dependent phosphorylation of MARCKS. Cell imaging receptor-modulated pathways that control MARCKS phos- and hydrodynamic approaches revealed that MARCKS is tar- phorylation. The MARCKS-null mouse is embryonic lethal geted to plasmalemmal caveolae and undergoes subcellular because of severe neural defects (3), yet no tissue-specific at HARVARD UNIVERSITY, on January 19, 2011 translocation in response to insulin. Insulin treatment pro- MARCKS knockout mouse models have been reported. moted an increase in levels of the signaling phospholipid phos- Whereas the presence of the MARCKS protein has been doc- phatidylinositol 4,5-bisphosphate (PIP2) in plasmalemmal umented in a wide variety of cells and tissues, there are major caveolae. The insulin-stimulated increase in caveolar PIP2 was gaps in our understanding of the roles of MARCKS in recep- blocked by siRNA-mediated knockdown of MARCKS, as de- tor-modulated signaling pathways. Our studies focused on termined using both biochemical assays and imaging studies analyzing the roles of MARCKS in vascular endothelial cells, a using FRET-based PIP2 biosensors. The critical role of PIP2 in cell type notable for its remarkable diversity of interconnected MARCKS responses was explored by examining the PIP2- and signaling pathways, many of which are targeted to plasmale- actin-binding proteins Arp2/3 and N-WASP. Insulin pro- mmal caveolae. moted the rapid and robust phosphorylation of both N-WASP In endothelial cells, plasmalemmal caveolae serve as sites and Arp2/3, but these phosphorylation responses were mark- for the sequestration of diverse receptors, G-proteins, protein edly attenuated by siRNA-mediated MARCKS knockdown. and lipid kinases and phosphatases, and many other signaling Moreover, MARCKS knockdown effectively abrogated molecules. Plasmalemmal caveolae are also characterized by N-WASP activation in response to insulin, as determined us- having a distinct lipid composition and are enriched in PIP2 ing a FRET-based N-WASP activity biosensor. Taken together, and other signaling lipids (4). Many caveola-targeted signaling these studies show that MARCKS plays a key role in insulin- pathways are modulated by the scaffolding/regulatory protein dependent endothelial signaling to PIP2 and is a critical deter- caveolin-1, which is an important constituent of plasmale- minant of actin assembly and directed cell movement in the mmal caveolae. Like MARCKS, caveolin-1 also binds to spe- vascular endothelium. cific lipids and to actin (5–7). Although the pathways that regulate MARCKS targeting to caveolae are largely unknown, the interactions between MARCKS with membrane phospho- The MARCKS protein (myristoylated alanine-rich C kinase lipids have been explored extensively (8–10). When substrate) was discovered in 1989 as a phosphoprotein MARCKS is phosphorylated, its binding affinity to membrane abundantly expressed in neuronal tissues. Over the years, phospholipids is decreased, and MARCKS may be released from the plasma membrane and translocate to perinuclear * This work was supported, in whole or in part, by National Institutes of regions of the cell (8–10). MARCKS phosphorylation and Health Grants GM36259, HL48743, and HL46457 (to T. M.). This work was translocation are associated with alterations in the actin cy- also supported by Postdoctoral Fellowship PDR-09-002 from the Fonds toskeleton (11) and may lead to changes in cell motility (2). National de la Recherche (Luxembourg) (to H. K.). □S The on-line version of this article (available at http://www.jbc.org) con- tains supplemental Figs. 1 and 2. 1 2 To whom correspondence may be addressed: 75 Francis St., Thorn Bldg. The abbreviations used are: PIP2, phosphatidylinositol 4,5-bisphosphate; 1210A, Boston, MA 02115. Tel.: 617-732-7376; Fax: 617-732-5132; E-mail: BAEC, bovine aortic endothelial cells; PLC, phospholipase C; PH, pleck- [email protected]. strin homology. 2320 JOURNAL OF BIOLOGICAL CHEMISTRY VOLUME 286•NUMBER 3•JANUARY 21, 2011 MARCKS-modulated PIP2 Metabolism in Endothelial Cells MARCKS thus has the distinctive characteristics of binding gift of Professor John Condeelis (Albert Einstein College of both to the phospholipid PIP2 as well as to actin. The PIP2- Medicine) (21). All other reagents were from Sigma. binding WAVE proteins represent one of the few other siRNA Design—On the basis of established characteristics protein families that share this feature of binding both to mem- of siRNA-targeting constructs (22, 23), we designed a brane phospholipids and to the actin cytoskeleton. The PIP2- MARCKS duplex siRNA corresponding to bases 223–241 binding WAVE family member N-WASP and its downstream from the open reading frame of the bovine MARCKS mRNA: actin-binding protein Arp2/3 (12–14) represent attractive 5Ј-GCG CUU UUC CUU CAA GAA-dTdT-3Ј. The RNA se- candidates for partnering with MARCKS in intracellular sig- quence used as a negative control for siRNA activity was 5Ј- naling. However, the interactions of MARCKS, WAVE pro- GCG CGC UUU GUA GGA UUC G-dTdT-3Ј. All duplex teins, and Arp2/3 in control of endothelial signaling pathways siRNA-targeting constructs were purchased from Ambion. are almost entirely unexplored. Cell Culture and Transfection—Bovine aortic endothelial As implied by its name, MARCKS is a target for phosphor- cells (BAEC) were obtained from Genlantis (San Diego, CA) ylation by PKC. In adipocytes, insulin-stimulated PKC activa- and maintained in culture in Dulbecco’s modified Eagle’s me- tion leads to MARCKS phosphorylation (15). In vascular en- dium supplemented with fetal bovine serum (10%, v/v) as de- dothelial cells, insulin treatment leads to the activation of scribed previously (24). Cells were plated onto gelatin-coated several PKC isoforms as well as kinase Akt (16). Insulin-de- culture dishes and studied prior to cell confluence between pendent endothelial signaling pathways are aberrant in diabe- passages 6 and 8. siRNA transfections were performed as de- Downloaded from tes and other vascular disease states (17). In addition to its scribed previously (25). Briefly, 24 h after cells were split at a well characterized roles in muscle, fat, and liver, insulin is 1:8 ratio, and duplex siRNA constructs (final concentration 30 emerging as a critical determinant of vascular function (17). nM) were transfected using Lipofectamine 2000 (0.15%, v/v), However, the role of insulin in regulation of MARCKS-modu- following the protocol provided by the manufacturer. Lipo- lated responses in endothelial cells is largely unexplored. fectamine 2000 was then removed by changing into fresh me- www.jbc.org These studies examined the role of MARCKS in insulin- dium containing 10% FBS 5 h after transfection. Plasmid activated signaling pathways in vascular endothelial cells. transfection was carried out with FuGENE 6 at a ratio of 1:3 We used RNA interference methods, biochemical ap- (w/v) according to the manufacturer’s protocol. For combined proaches, and novel biosensors to explore the effects of transfections of siRNA-targeting constructs plus plasmid at HARVARD UNIVERSITY, on January 19, 2011 siRNA-mediated MARCKS knockdown on PIP2 metabolism cDNA, the siRNA was transfected first as described above. 5 h and PIP2-modulated signaling responses involving the PIP2- after siRNA transfection, the medium was replaced, and the binding WAVE protein N-WASP and its actin-binding part- DNA mixture in FuGENE 6 was added and incubated with ner Arp2/3. These studies revealed novel connections be- the cells overnight, at which point the medium
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