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• W2092252912 abstract "The ERM (ezrin, radixin, moesin) proteins function as cross-linkers between cell membrane and cytoskeleton by binding to membrane proteins via their N-terminal domain and to F-actin via their C-terminal domain. Previous studies from our laboratory have shown that the α-subunit of heterotrimeric G13 protein induces conformational activation of radixin via interaction with its N-terminal domain (Vaiskunaite, R., Adarichev, V., Furthmayr, H., Kozasa, T., Gudkov, A., and Voyno-Yasenetskaya, T. A. (2000) J. Biol. Chem. 275, 26206–26212). In the present study, we tested whether radixin can regulate Gα13-mediated signaling pathways. We determined the effects of the N-terminal domain (amino acids 1–318) and C-terminal domain (amino acids 319–583) of radixin on serum response element (SRE)-dependent gene transcription initiated by a constitutively activated Gα13Q226L. The N-terminal domain potentiated SRE activation induced by Gα13Q226L; RhoGDI inhibited this effect. Surprisingly, the C-terminal domain also stimulated the SRE-dependent gene transcription. When co-transfected with Gα13Q226L, the C-terminal domain of radixin synergistically stimulated the SRE activation; RhoGDI inhibited this effect. Using in vivo pull-down assays, we have determined that the C-terminal domain of radixin activated Rac1 but not RhoA or Cdc42 proteins. By contrast, Gα13Q226L activated RhoA but not Rac1 or Cdc42. We have also shown that both the C-terminal domain of radixin and Gα13Q226L can stimulate Ca2+/calmodulin-dependent kinase, CaMKII. Activated mutant that mimics the phosphorylated state of radixin (T564E) stimulated Rac1, induced the phosphorylation of CaMKII, and stimulated SRE-dependent gene transcription. Down-regulation of endogenous radixin using small interference RNA inhibited SRE-dependent gene transcription and phosphorylation of CaMKII induced by Gα13Q226L. Overall, our results indicated that radixin via its C-terminal domain mediates SRE-dependent gene transcription through activation of Rac1 and CaMKII. In addition, the radixin-CaMKII signaling pathway is involved in Gα13-mediated SRE-dependent gene transcription, suggesting that radixin could be involved in novel signaling pathway regulated by G13 protein. The ERM (ezrin, radixin, moesin) proteins function as cross-linkers between cell membrane and cytoskeleton by binding to membrane proteins via their N-terminal domain and to F-actin via their C-terminal domain. Previous studies from our laboratory have shown that the α-subunit of heterotrimeric G13 protein induces conformational activation of radixin via interaction with its N-terminal domain (Vaiskunaite, R., Adarichev, V., Furthmayr, H., Kozasa, T., Gudkov, A., and Voyno-Yasenetskaya, T. A. (2000) J. Biol. Chem. 275, 26206–26212). In the present study, we tested whether radixin can regulate Gα13-mediated signaling pathways. We determined the effects of the N-terminal domain (amino acids 1–318) and C-terminal domain (amino acids 319–583) of radixin on serum response element (SRE)-dependent gene transcription initiated by a constitutively activated Gα13Q226L. The N-terminal domain potentiated SRE activation induced by Gα13Q226L; RhoGDI inhibited this effect. Surprisingly, the C-terminal domain also stimulated the SRE-dependent gene transcription. When co-transfected with Gα13Q226L, the C-terminal domain of radixin synergistically stimulated the SRE activation; RhoGDI inhibited this effect. Using in vivo pull-down assays, we have determined that the C-terminal domain of radixin activated Rac1 but not RhoA or Cdc42 proteins. By contrast, Gα13Q226L activated RhoA but not Rac1 or Cdc42. We have also shown that both the C-terminal domain of radixin and Gα13Q226L can stimulate Ca2+/calmodulin-dependent kinase, CaMKII. Activated mutant that mimics the phosphorylated state of radixin (T564E) stimulated Rac1, induced the phosphorylation of CaMKII, and stimulated SRE-dependent gene transcription. Down-regulation of endogenous radixin using small interference RNA inhibited SRE-dependent gene transcription and phosphorylation of CaMKII induced by Gα13Q226L. Overall, our results indicated that radixin via its C-terminal domain mediates SRE-dependent gene transcription through activation of Rac1 and CaMKII. In addition, the radixin-CaMKII signaling pathway is involved in Gα13-mediated SRE-dependent gene transcription, suggesting that radixin could be involved in novel signaling pathway regulated by G13 protein. Disruption of the gene encoding the G13 subunit in mice impairs the ability of endothelial cells to develop into an organized vascular system and results in embryo lethality, which underlines the physiological importance of this Gα subunit (3Offermanns S. Mancino V. Revel J.P. Simon M.I. Science. 1997; 275: 533-536Crossref PubMed Scopus (296) Google Scholar). In cells, G13 plays a role in multiple cellular functions, such as stress fiber formation, cellular transformation, regulation of Na+/H+ exchanger (NHE1), induction of mitogenesis and apoptosis, and regulation of the extracellular signal-regulated kinase and c-Jun N-terminal kinase pathways (4Buhl A.M. Johnson N.L. Dhanasekaran N. Johnson G.L. J. Biol. Chem. 1995; 270: 24631-24634Abstract Full Text Full Text PDF PubMed Scopus (422) Google Scholar, 5Vara Prasad M.V. Shore S.K. Dhanasekaran N. Oncogene. 1994; 9: 2425-2429PubMed Google Scholar, 6Voyno-Yasenetskaya T.A. Conklin B.R. Gilbert R.L. Hooley R. Bourne H.R. Barber D.L. J. Biol. Chem. 1994; 269: 4721-4724Abstract Full Text PDF PubMed Google Scholar, 7Voyno-Yasenetskaya T.A. Pace A.M. Bourne H.R. Oncogene. 1994; 9: 2559-2565PubMed Google Scholar, 8Voyno-Yasenetskaya T.A. Faure M.P. Ahn N.G. Bourne H.R. J. Biol. Chem. 1996; 271: 21081-21087Abstract Full Text Full Text PDF PubMed Scopus (100) Google Scholar, 9Adarichev V.A. Vaiskunaite R. Niu J. Balyasnikova I.V. Voyno-Yasenetskaya T.A. Am. J. Physiol. Cell Physiol. 2003; 285: C922-C934Crossref PubMed Scopus (14) Google Scholar). Identifying the Rho guanine nucleotide exchange factor, p115RhoGEF, as an effector for G13 has contributed to the understanding of the some cellular events mediated by G13 (10Hart M.J. Jiang X. Kozasa T. Roscoe W. Singer W.D. Gilman A.G. Sternweis P.C. Bollag G. Science. 1998; 280: 2112-2114Crossref PubMed Scopus (678) Google Scholar, 11Kozasa T. Jiang X. Hart M.J. Sternweis P.M. Singer W.D. Gilman A.G. Bollag G. Sternweis P.C. Science. 1998; 280: 2109-2111Crossref PubMed Scopus (741) Google Scholar). For instance, activation of RhoA by G13 is responsible for actin stress fiber formation, SRE 2The abbreviations used are:SREserum response elementGDIguanine nucleotide dissociation inhibitorsiRNAsmall interference RNACaMKCa2+/calmodulin-dependent kinaseGSTglutathione S-transferaseBAPTA/AM1,2-bis(2-aminophenoxy)ethane-N,N,N′,N′-tetraacetic acid acetoxymethyl esterGEFguanine nucleotide exchange factorPBDp21 binding domainRBDRho binding domain -dependent gene transcription, and NHE1 activity (4Buhl A.M. Johnson N.L. Dhanasekaran N. Johnson G.L. J. Biol. Chem. 1995; 270: 24631-24634Abstract Full Text Full Text PDF PubMed Scopus (422) Google Scholar, 12Hooley R. Yu C.Y. Symons M. Barber D.L. J. Biol. Chem. 1996; 271: 6152-6158Abstract Full Text Full Text PDF PubMed Scopus (160) Google Scholar, 13Kurose H. Life Sci. 2003; 74: 155-161Crossref PubMed Scopus (91) Google Scholar). serum response element guanine nucleotide dissociation inhibitor small interference RNA Ca2+/calmodulin-dependent kinase glutathione S-transferase 1,2-bis(2-aminophenoxy)ethane-N,N,N′,N′-tetraacetic acid acetoxymethyl ester guanine nucleotide exchange factor p21 binding domain Rho binding domain However, a number of signaling events regulated by G13 are Rho-independent. Thus, G13-mediated activation of big mitogen-activated protein kinase (also known as extracellular signal-regulated kinase 5) is Ras- and Rho-independent (14Fukuhara S. Marinissen M.J. Chiariello M. Gutkind J.S. J. Biol. Chem. 2000; 275: 21730-21736Abstract Full Text Full Text PDF PubMed Scopus (79) Google Scholar). Similarly, G13-mediated chloride conductance (15Postma F.R. Jalink K. Hengeveld T. Offermanns S. Moolenaar W.H. Curr. Biol. 2001; 23: 121-124Abstract Full Text Full Text PDF Scopus (21) Google Scholar) and G13-mediated activation of protein kinase A (16Niu J. Vaiskunaite R. Suzuki N. Kozasa T. Carr D.W. Dulin N. Voyno-Yasenetskaya T.A. Curr. Biol. 2001; 11: 1686-1690Abstract Full Text Full Text PDF PubMed Scopus (73) Google Scholar) are both RhoA-independent. In order to identify novel putative G13 effectors, our laboratory had used yeast two-hybrid screening and demonstrated that G13 subunit interacts with cytoskeleton-associated protein radixin (1Vaiskunaite R. Adarichev V. Furthmayr H. Kozasa T. Gudkov A. Voyno-Yasenetskaya T.A. J. Biol. Chem. 2000; 275: 26206-26212Abstract Full Text Full Text PDF PubMed Scopus (75) Google Scholar). Radixin belongs to the conserved ERM (ezrin, radixin, moesin) protein family. ERM proteins play a role in multiple cell functions, such as cell shape maintenance, formation of microvilli, cell-cell adhesion, cell migration, membrane trafficking, and cell polarity (see reviews in Refs. 17Louvet-Vallee S. Biol. Cell. 2000; 92: 305-316Crossref PubMed Scopus (278) Google Scholar, 18Bretscher A. Curr. Opin. Cell Biol. 1999; 11: 109-116Crossref PubMed Scopus (333) Google Scholar, 19Gautreau A. Poulett P. Louvard D. Arpin M. Proc. Natl. Acad. Sci. U. S. A. 1999; 96Crossref PubMed Scopus (272) Google Scholar, 20Miller K.G. Trends Cell Biol. 2003; 13: 165-168Abstract Full Text Full Text PDF PubMed Scopus (20) Google Scholar). ERM proteins consist of the high homology N-terminal FERM (band 4.1, ERM) domain and the C-terminal domain (21Bretscher A. Reczek D. Berryman M. J. Cell Sci. 1997; 110: 3011-3018Crossref PubMed Google Scholar). Interaction between the N-terminal FERM domain and the C-terminal domain maintains a dormant inactive state of the ERM proteins. In an active open state, the N-terminal domain binds to the membrane proteins such as CD43, CD44, ICAM1–3, Na+/H+ exchanger regulator (NHE3), the cystic fibrosis transmembrane conductance regulator, and the 2-adrenergic receptor, whereas C-terminal domain binds to F-actin. Therefore, ERM proteins were originally regarded as cross-linkers between cytoskeletal actin and the plasma membrane. Recently, it was suggested that ERM proteins function as signaling molecules. Interaction of ezrin with the regulatory p85 subunit of phosphatidylinositol 3-kinase is required for phosphatidylinositol 3-kinase-dependent cell survival (19Gautreau A. Poulett P. Louvard D. Arpin M. Proc. Natl. Acad. Sci. U. S. A. 1999; 96Crossref PubMed Scopus (272) Google Scholar). ERM proteins have been shown to interact with and to be involved in Syk-mediated tyrosine kinase signaling (22Urzainqui A. Serrador J.M. Viedma F. Yanez-Mo M. Rodriguez A. Corbi A.L. Alonso-Lebrero J.L. Luque A. Deckert M. Vazquez J. Sanchez-Madrid F. Immunity. 2002; 17: 401-412Abstract Full Text Full Text PDF PubMed Scopus (181) Google Scholar). Importantly, ERM proteins are involved in the regulation of the Rho pathway. Binding of the guanine nucleotide dissociation inhibitor (RhoGDI) by the N-terminal domain of radixin promotes Rho activation in vitro (2Takahashi K. Sasaki T. Mammoto A. Takaishi K. Kameyama T. Tsukita S. Tsukita S. Takai Y. J. Biol. Chem. 1997; 272: 23371-23375Abstract Full Text Full Text PDF PubMed Scopus (367) Google Scholar). Interestingly, phosphorylation of ERM at the C terminus by Rho kinase maintains radixin in a relaxed active state (23Matsui T. Maeda M. Doi Y. Yonemura S. Amano M. Kaibuchi K. Tsukita S. Tsukita S. J. Cell Biol. 1998; 140: 647-657Crossref PubMed Scopus (728) Google Scholar), suggesting that the ERM proteins can act both upstream and downstream of the Rho signaling pathway. The fact that Gα13 interacts with radixin and induces the open active state of radixin, resulting in the increased binding for F-actin (1Vaiskunaite R. Adarichev V. Furthmayr H. Kozasa T. Gudkov A. Voyno-Yasenetskaya T.A. J. Biol. Chem. 2000; 275: 26206-26212Abstract Full Text Full Text PDF PubMed Scopus (75) Google Scholar), leads us to propose that radixin may function as a signaling molecule for Gα13. To test this hypothesis, we examined the role of radixin on Gα13-mediated SRE-dependent gene transcription. Extracellular signals such as serum and lysophosphatidic acid cause Rho activation and subsequently actin dynamics change; thereafter, the decrease of free G-actin pool initiates the activation of SRE-dependent gene transcription (24Hill C.S. Wynne J. Treisman R. Cell. 1995; 81: 1159-1170Abstract Full Text PDF PubMed Scopus (1207) Google Scholar, 25Sotiropoulos A. Gineitis D. Copeland J. Treisman R. Cell. 1999; 98: 159-169Abstract Full Text Full Text PDF PubMed Scopus (575) Google Scholar). Other members of the small Rho GTPase family, Rac and Cdc42, also stimulate the SRE gene transcription (24Hill C.S. Wynne J. Treisman R. Cell. 1995; 81: 1159-1170Abstract Full Text PDF PubMed Scopus (1207) Google Scholar). In addition, the increase in intracellular Ca2+ leads to SRE-dependent gene transcription and is mediated by Ca2+/calmodulin-dependent kinases, CaMKII and CaMKIV (26Miranti C.K. Ginty D.D. Huang G. Chatila T. Greenberg M.E. Mol. Cell. Biol. 1995; 15: 3672-3684Crossref PubMed Scopus (197) Google Scholar). Here, we report that radixin via its C-terminal domain mediated SRE-dependent gene transcription through activation of Rac1 and CaMKII. We have also shown that radixin-CaMKII signaling is involved in Gα13 protein-mediated SRE-dependent gene transcription. Materials—Full-length, N-terminal, and C-terminal domains of radixin have been described before (1Vaiskunaite R. Adarichev V. Furthmayr H. Kozasa T. Gudkov A. Voyno-Yasenetskaya T.A. J. Biol. Chem. 2000; 275: 26206-26212Abstract Full Text Full Text PDF PubMed Scopus (75) Google Scholar). pGEX-2T containing rhotekin-Rho binding domain and pGEX4T3 containing p21-binding domain of PAK1 were provided by Dr. A. Schwartz and G. Bokoch (The Scripps Research Institute), respectively. The internal EE-tagged G13Q226L, the constitutively activated RhoA and Rac, and the dominant negative RhoA, Rac1, and Cdc42 were purchased from the Guthrie Research Institute (Sayre, PA). The dominant negative CaMKII (K42M) and dominant negative CaMKIV (dCTK75E) were gifts from Dr. M. Rosner (University of Chicago) and Dr. J. Xie (University of Manitoba), respectively. Genistein, piceataneriod, LFM-A13, BAPTA/AM, KN-93, and cyclosporine A were purchased from Calbiochem. Monoclonal antibodies against RhoA, Rac1, Cdc42, polyclonal antibodies against total and phosphorylated CaMKII, and polyclonal antibody against radixin were from Santa Cruz Biotechnology, Inc. (Santa Cruz, CA). Monoclonal antibody against EE epitope was from Covance (Berkeley, CA). Cell Culture and Transfection—NIH 3T3 fibroblasts were grown in Dulbecco's modified Eagle's medium supplemented with 10% heat-inactivated calf serum, 100 units/ml streptomycin, and 100 units/ml penicillin. Lipofectamine 2000 reagent (Invitrogen) was used for transfection following the manufacturer's instructions. Radixin Down-regulation—Expression of the endogenous radixin was down-regulated by siRNA using the BD™ Knock-out RNAi Systems (BD Biosciences). The target sequence is the 19 nucleotides corresponding to the coding region between nucleotides 188 and 207 of the mouse radixin. The siRNA sequence contains the target sense sequence, hairpin loop, and target antisense sequence; the same sequence without the target antisense sequence was designed as control siRNA. The primers were chemically synthesized by Sigma-Genosys (The Woodlands, TX). After annealing, they were subcloned into the vector pSIREN-RetroQ (BD Biosciences). The sequences were confirmed by DNA sequencing. Reporter Gene Assay—SRE-mediated gene expression was determined by the SRE.L reporter system (Stratagene) as described previously (27Ponimaskin E.G. Profirovic J. Vaiskunaite R. Richter D.W. Voyno-Yasenetskaya T.A. J. Biol. Chem. 2002; 277: 20812-20819Abstract Full Text Full Text PDF PubMed Scopus (72) Google Scholar). Briefly, NIH 3T3 cells at 90% confluence grown on 24-well plates were transfected with the following plasmids (per well): 50 ng of pSRE.L reporter, 50 ng of pCMV-galactosidase (LacZ) (control plasmid for transfection efficiency), and 50–200 ng of other plasmids indicated in each experiments as described under “Results.” The cells were serum-starved overnight before assays. Washed with phosphate-buffered saline buffer, the cells were lysed and assayed following the manufacturer's instruction for luciferase activity and β-galactosidase activity with the Promega assay kit (Promega, Madison, WI). Luciferase activity was normalized to the activity of β-galactosidase to correct the difference caused by different transfection efficiency. In Vivo Rho GTPase Activation Assay—Activation of Rho proteins in vivo was determined by using pull-down assays as described by us earlier (28Niu J. Profirovic J. Pan H. Vaiskunaite R. Voyno-Yasenetskaya T. Circ. Res. 2003; 93: 848-856Crossref PubMed Scopus (96) Google Scholar). These assays involve the use of glutathione S-transferase (GST) fusion proteins containing the GTP-dependent binding domains from effectors that bind the various Rho GTPases. Rhotekin interacts with GTP-bound RhoA but not with Rac1 or Cdc42. Conversely, the PAK serine/threonine kinase interacts with activated Rac1 and Cdc42 but not with RhoA. pGEX expression vectors encoding GST fusion proteins that contain the isolated GTP-dependent binding domains of the Rac1 and Cdc42 effector PAK1 (amino acids 70–132 of PAK1; PAK PBD) or the RhoA effector rhotekin (amino acids 7–89 of rhotekin; rhotekin RBD) were used for the bacterial expression of GST fusion proteins. Confluent NIH 3T3 cells (100-mm dishes) were transfected with the indicated cDNAs for 48 h. Cells were serum-starved 24 h prior the experiment. Cells were then quickly washed with ice-cold Tris-buffered saline and lysed in lysis buffer (50 mm Tris, pH 7.4, 1% Triton X-100, 0.5% sodium deoxycholate, 0.1% SDS, 500 mm NaCl, 10 mm MgCl2, 10 μg/ml each of aprotinin and leupeptin, and 1 mm phenylmethylsulfonyl fluoride. Cell lysates were clarified by centrifugation at 14,000 × g at 4 °C for 2 min, and equal volumes of cell lysates were incubated with GST-RBD rhotekin beads or GST-RBD PAK beads (15 μg) at 4 °C for 1 h. The beads were washed three times with wash buffer (50 mm Tris, pH 7.4, 1% Triton X-100, 150 mm NaCl, 10 mm MgCl2, 10 μg/ml each of aprotinin and leupeptin, and 0.1 mm phenylmethylsulfonyl fluoride), and bound Rho, Rac1, or Cdc42 were eluted by boiling in Laemmli sample buffer. Samples eluted from the beads and the total cell lysates were then separated on 12.5% SDS-polyacrylamide gel electrophoresis, transferred to nitrocellulose, and analyzed by Western blotting using appropriate antibodies. Western Blotting for Detection of Phosphorylation of CaMKII—Cells were washed with ice-cold phosphate-buffered saline, lysed in ice-cold radioimmune precipitation buffer (50 mm Tris-HCl, pH 7.5, 150 mm NaCl, 1% Nonidet P-40, 0.5% sodium deoxycholate, 0.1% SDS, 10 μl/ml protease inhibitor mixture), and sonicated on ice. The insoluble material was removed from the lysates by centrifugation at 14,000 × g for 10 min. Protein concentration of the total cell lysates was determined using a Bio-Rad DC protein assay kit (Bio-Rad). 50 μg of proteins were subjected to SDS-PAGE, transferred to a polyvinylidene difluoride membrane, and analyzed by immunoblotting with the appropriate antibodies. Statistical Analysis—For statistical analysis, Student's t test was used to compare data between two groups. Values are expressed as mean ± S.D. of three independent experiments. p < 0.05 was considered statistically significant. Activation of SRE-dependent Gene Transcription by the C-terminal Domain of Radixin—Rho proteins, including Rho, Rac, and Cdc42, are regulated by the guanine nucleotide dissociation inhibitors (GDIs), which inhibit the dissociation of the nucleotide bound to these proteins. The dissociation of GDI from the protein is a prerequisite for membrane association and activation of these Rho proteins by guanine nucleotide exchange factors (29Olofsson B. Cell Signal. 1999; 11: 545-554Crossref PubMed Scopus (412) Google Scholar). Based on the evidence that Gα13 interacts with and activates radixin (1Vaiskunaite R. Adarichev V. Furthmayr H. Kozasa T. Gudkov A. Voyno-Yasenetskaya T.A. J. Biol. Chem. 2000; 275: 26206-26212Abstract Full Text Full Text PDF PubMed Scopus (75) Google Scholar) and that RhoGDI interacts with N-terminal domain of radixin, thereby displacing RhoGDI from Rho proteins in in vitro studies (2Takahashi K. Sasaki T. Mammoto A. Takaishi K. Kameyama T. Tsukita S. Tsukita S. Takai Y. J. Biol. Chem. 1997; 272: 23371-23375Abstract Full Text Full Text PDF PubMed Scopus (367) Google Scholar), it was reasonable to expect that domain(s) of radixin may regulate Gα13-mediated activation of RhoA and subsequent cellular signaling. We tested how expression of the N-terminal (amino acids 1–318), or C-terminal (amino acids 319–583) domains of radixin affected the Gα13-mediated SRE-dependent gene transcription. As shown in Fig. 1A, RhoGDI inhibited SRE activation induced by Gα13Q226L expression, supporting the notion that Rho proteins mediate SRE activation induced by Gα13Q226L. The N-terminal domain of radixin did not exhibit any basal activity compared with the empty vector. However, the N-terminal domain of radixin potentiated SRE activation induced by Gα13Q226L. RhoGDI inhibited SRE activation induced by the combination of Gα13Q226L and the N-terminal domain of radixin (Fig. 1A). Interestingly, the C-terminal domain of radixin itself induced a 2-fold increase of the SRE-dependent gene transcription that was inhibited by RhoGDI (Fig. 1A). Surprisingly, when co-transfected with Gα13Q226L, the C-terminal domain radixin synergistically stimulated the SRE activation (Fig. 1A). This activation was also inhibited by RhoGDI, suggesting that Rho proteins are involved in this signaling pathway. To rule out the possibility that observed synergistic stimulation of SRE was due to changes in expression of transfected proteins, we analyzed whether the expression of Gα13Q226L with internal EE epitope was affected by the C-terminal domain of radixin. Detection of Gα13Q226L-EE with EE antibody showed that the C-terminal domain of radixin did not change the expression of G13Q226L-EE (Fig. 1B), suggesting that observed stimulation of SRE activity was not due to increased expression of Gα13. Gα13Q226L-EE showed the similar to Gα13Q226L stimulation of SRE-dependent gene transcription (data not shown). Reprobing of the same blots with Gα13 antibody did not reveal a detectable difference of Gα13 expression in cells transfected with Gα13Q226L-EE or vector alone, suggesting that overexpression of the transfected construct was minimal. To further analyze the SRE-dependent gene transcription regulated by the C-terminal domain of radixin, we evaluated how different amounts of C-terminal domain of radixin cDNA affected Gα13Q226L-dependent SRE activation (Fig. 1C). Data showed that the C-terminal domain of radixin stimulated SRE-dependent gene transcription in a dose-dependent manner both alone and in the presence of Gα13Q226L (Fig. 1C). Involvement of Rac1 in SRE Activation Induced by the C-terminal Domain of Radixin—To evaluate the effect of radixin on activation of individual Rho GTPases, we used the Rho-binding domain of the RhoA effector, rhotekin, to affinity-precipitate active RhoA, as a direct readout for RhoA activation. We have also used the Rac1- and Cdc42-binding domains of Rac1 and Cdc42 effector PAK to affinity-precipitate active Rac1 and Cdc42 as a direct readout for Rac1 and Cdc42 activation. NIH 3T3 cells were transfected with either the C-terminal domain of radixin or Gα13Q226L. Data showed that Gα13Q226L induced a 5–6-fold increase in RhoA activity (Fig. 2A). Importantly, Gα13Q226L did not activate Rac1 or Cdc42 (Fig. 2A). The C-terminal domain of radixin expressed alone or in the presence of Gα13Q226L did not affect RhoA activity (Fig. 2A; data not shown). In addition, wild-type and N-terminal domain of radixin did not affect the activity of Rho proteins (data not shown). By contrast, the C-terminal domain of radixin activated Rac1 but not RhoA and Cdc42 (Fig. 2A). The C-terminal domain of radixin expressed in the presence of Gα13Q226L did not further enhanced Rac1 activity (data not shown). Equal protein expression of the C-terminal domain of radixin or Gα13Q226L was controlled by Western blotting (data not shown), which confirmed that the different effects of these proteins on activation of Rho GTPases was not due to difference in the amount of expressed protein. These data provided the direct evidence that in mammalian cells, Gα13Q226L stimulated RhoA, whereas the C-terminal domain of radixin stimulated Rac1 proteins. To further support the observation that the C-terminal domain of radixin stimulated Rac1 protein, we have used dominant negative mutants of these GTPases. Data showed that dominant negative mutants of Rac1 (T17N) but not RhoA (T19N) or Cdc42 (T17N) inhibited SRE activation induced by the C-terminal domain of radixin (Fig. 2B). Thus, this result further corroborated the finding that C-terminal domain of radixin regulated activity of Rac1 but not RhoA or Cdc42 proteins. In addition, the data showed that both C3 toxin and dominant negative Rac1(T17N) inhibited Gα13-induced SRE activation (Fig. 2C). The different sensitivities of reporter assay and pull-down assay may have contributed to the differences in the data. Involvement of CaMKII in SRE Activation Induced by C-terminal Domain of Radixin and Gα13Q226L—Partial inhibition by dominant negative Rac1 of the SRE activation induced by the C-terminal domain of radixin suggested that an additional pathway involved in SRE activation might exist. Since some tyrosine kinases and two isoforms of Ca2+/calmodulin-dependent kinase, CaMKII and CaMKIV, have been shown to stimulate SRE gene transcription (26Miranti C.K. Ginty D.D. Huang G. Chatila T. Greenberg M.E. Mol. Cell. Biol. 1995; 15: 3672-3684Crossref PubMed Scopus (197) Google Scholar, 30Mao J. Xie W. Yuan H. Simon M.I. Mano H. Wu D. EMBO J. 1998; 17: 5638-5646Crossref PubMed Scopus (87) Google Scholar, 31Shi C.S. Sinnarajah S. Cho H. Kozasa T. Kehrl J.H. J. Biol. Chem. 2000; 275: 24470-24476Abstract Full Text Full Text PDF PubMed Scopus (74) Google Scholar, 32Lin K. Wang D. Sadee W. J. Biol. Chem. 2002; 277: 40789-40798Abstract Full Text Full Text PDF PubMed Scopus (21) Google Scholar, 33Hao S. Kurosaki T. August A. EMBO J. 2003; 22: 4166-4177Crossref PubMed Scopus (43) Google Scholar, 34Suzuki N. Nakamura S. Mano H. Kozasa T. Proc. Natl. Acad. Sci. U. S. A. 2003; 100: 733-738Crossref PubMed Scopus (175) Google Scholar, 35Davis F.J. Gupta M. Camoretti-Mercado B. Schwartz R.J. Gupta M.P. J. Biol. Chem. 2003; 278: 20047-20058Abstract Full Text Full Text PDF PubMed Scopus (100) Google Scholar), we determined how inhibitors of tyrosine kinases and inhibitors of CaMK affect the SRE activation induced by the C-terminal domain of radixin. At concentrations chosen for the activity against the respective target enzymes, general tyrosine kinase inhibitor genistein (50 μm) and selective Syk tyrosine kinase inhibitor piceataneriod (10 μm) did not affect the transcriptional activity (data not shown), suggesting that tyrosine kinases are probably not involved in the SRE activation induced by the C-terminal domain of radixin. To test the involvement of the Ca2+/calmodulin-dependent kinase pathway, we examined how intracellular calcium chelator (BAPTA/AM), calmodulin kinase inhibitor (KN-93), and calcineurin inhibitor (cyclosporine) affect SRE activation induced by the C-terminal domain of radixin. Our results showed that BAPTA/AM and KN-93 inhibited SRE activation (Fig. 3A), suggesting that the Ca2+/calmodulin-dependent kinase pathway may be involved in the regulation of SRE gene transcription induced by the C-terminal domain of radixin. Because both CaMKII and CaMKIV stimulate SRE gene transcription and KN-93 inhibits the activity of both kinases, next we examined whether the dominant negative mutants of CaMKII and CaMIV can affect the SRE activation induced by the C-terminal domain of radixin. As shown in Fig. 3B, the dominant negative mutant of CaMKII but not of CaMKIV inhibited the SRE activation induced by the C-terminal domain of radixin. Because dominant negative Rac1 induced partial inhibition of SRE activity (Fig. 2B), we tested whether simultaneous inhibition of Rac1 and CaMKII inputs will further decrease the SRE activity induced by the C-terminal domain of radixin. Data showed that both dominant negative Rac1 and kinase-dead CaMKII partially inhibited SRE activity induced by C-terminal domain of radixin (Fig. 3C). Simultaneous inhibition of Rac1 and CaMKII by dominant negative constructs further inhibited SRE activity (Fig. 3C), suggesting that both inputs contributed to the SRE activity induced by the C-terminal domain of radixin. We tested the involvement of the Ca2+/calmodulin-dependent kinase pathway in Ga13-mediated signaling. Our results showed that BAPTA/AM and KN-93 inhibited SRE activation (Fig. 4A), suggesting that Ca2+/calmodulin dependent kinase pathway may be involved in the regulation of SRE gene transcription induced by the Gα13 protein. Interestingly, dominant negative mutants of CaMKII and CaMKIV inhibited the SRE activation induced by Gα13Q226L (Fig. 4A), suggesting that both CaMKII and CaMKIV are involved in Gα13-mediated SRE-dependent gene transcription. The phosphorylation state of CaMKII was analyzed using specific antibody targeted to the autophosphorylation site of CaMKII at residue of Thr286. We observed significant increase of the endogenous CaMKII phosphorylation (Fig. 4, B and C) in cells transfected with the C-terminal domain of radixin, whereas total CaMKII expression remained constant. Wild-type radixin or its N-terminal domain did not induce CaMKII phosphorylation (data not shown). Importantly, Gα13Q226L also induced CaMKII phosphorylation (Fig. 4, B and C). Co-transfection of C-terminal domain of radixin together with Gα13Q226L resulted in a further increase of CaMKII phosphorylation. These data provided evidence that both the C-terminal domain of radixin and Gα13Q226L stimulated CaMKII. Radixin Mutant Mimicking Phosphorylated State Activates Rac1 and Induces CaMKII Phosphorylation and SRE-dependent Gene Transcription—Activation of radixin requires relief of the intramolecular association, and this is believed to involve phosphorylation of threonine 564 (17Louvet-Vallee S. Biol. Cell. 2000; 92: 305-316Crossref PubMed Scopus (278) Google Scholar). To determine whether the C-terminal radixin accurately reflects an activated state of radixin, we made the mutant T564E radixin, which mimics the phosphorylated state of radixin (17Louvet-Vallee S. Biol. Cell. 2000; 92: 305-316Crossref PubMed Scopus (278) Google Scholar). Data showed that radixin (T564E) induced activation of Rac1 (Fig. 5A), phosphorylation of CaMKII (Fig. 5B), and SRE activation (Fig. 5C). Together, these results suggested that the C-terminal domain of radixin can reflect the activated state of radixin. Involvement of Radixin in Gα13-mediated SRE Gene Transcription—To test the involvement of radixin in Gα13-mediated signaling, we used siRNA technology to reduce the expression of endogenous radixin in NIH 3T3 cells. Cells were transfected with constructs containing either radixin or control siRNA, and 24 h later cell lysates were analyzed using Western blotting with antibodies against radixin, ezrin, or moesin. Densitometry analysis showed that expression of the endogenous radixin was down-regulated by ∼50% upon transfection of the NIH 3T3 cells with vector containing radixin siRNA (Fig. 6A). The transfection of the control siRNA vector did not affect the expression of the endogenous radixin. However, expression of endogenous ezrin or moesin was not affected by either control or radixin siRNAs (Fig. 6A), suggesting that siRNA-induced down-regulation of radixin was specific. Next, we tested whether down-regulation of the endogenous radixin can affect Gα13-mediated activation of SRE. Data showed that in the cells expressing vector containing radixin siRNA, SRE activity induced by Gα13Q226L was reduced by ∼50% (Fig. 6B). In the cells expressing control siRNA, Gα13-induced SRE activation was not affected. Importantly, SRE activity induced by a downstream effector of Gα13, p115RhoGEF, was not affected by down-regulation of radixin (Fig. 6B), indicating that the reduction of Gα13Q226L-mediated SRE activation by radixin siRNA was specific. Furthermore, radixin siRNA but not control siRNA also reduced the phosphorylation of CaMKII by Gα13Q226L (Fig. 6C). Taken together, these data suggested that radixin-CaMKII signaling is involved in the Gα13-induced SRE gene transcription. In the present study, we have demonstrated for the first time that radixin can activate Rac1 and induce phosphorylation of CaMKII. Activation of these proteins resulted in the stimulation of SRE-dependent gene transcription. We have also demonstrated that Gα13 can induce CaMKII phosphorylation. In addition, reducing endogenous radixin with siRNA demonstrated that the radixin-CaMKII signaling pathway is involved in Gα13-mediated SRE-dependent gene transcription. The partial inhibition by dominant negative Rac1(T17N) suggests the possibility that the radixin-Rac1 signaling pathway is also involved in Gα13-mediated SRE-dependent gene transcription. Taken together, our studies suggest that radixin could be involved in a novel signaling pathway regulated by Gα13 protein. However, we cannot exclude the possibility that Gα13 also activates CaMKII in a radixin-independent manner (Fig. 7). Activation of Rac1 by C-terminal Domain of Radixin—In contrast to the N-terminal domain, the C-terminal domain of radixin alone induced a 2-fold increase in SRE activity (Fig. 1). We explored the possible mechanism of this activation using pull-down assays for activation of Rho proteins. The results indicated that the C-terminal domain of radixin activated Rac1, but not RhoA or Cdc42 (Fig. 2). Because Rac1 can also stimulate SRE-dependent gene transcription, these data suggested that Rac1 might mediate the stimulation of SRE induced by the C-terminal domain of radixin. Inhibition of C-terminal domain-induced SRE activity by Rac1 (T17N) but not by RhoA (T19N) or Cdc42 (T17N) confirmed that the C-terminal domain of radixin stimulated SRE via Rac1 (Fig. 2B). Together, these data indicated that Rac1 is at least in part responsible for the stimulation of gene transcription by the C-terminal domain of radixin. Activation of Rac1 by the C-terminal domain of radixin was consistent with the other studies. Overexpression of ezrin T567D, in which an aspartic acid mimics the constitutive threonine phosphorylation of the C terminus, resulted in increased membrane ruffling and lamellipodia (36Gautreau A. Louvard D. Arpin M. J. Cell Biol. 2000; 150: 193-203Crossref PubMed Scopus (237) Google Scholar). In addition, it was recently reported that ezrin T567D induced Rac1 activation in Madin-Darby canine kidney cells (37Pujuguet P. Del Maestro L. Gautreau A. Louvard D. Arpin M. Mol. Biol. Cell. 2003; 14: 2181-2191Crossref PubMed Scopus (150) Google Scholar). Therefore, it seems that activated ERM proteins in an open relaxed state may activate Rac1. Our results indicated that the C-terminal domain of radixin mediated Rac1 activation. Furthermore, ezrin was shown to be cleaved by calpain following the stimulation with phorbol 12-myristate 13-acetate (38Shcherbina A. Bretscher A. Kenney D.M. Remold-O'Donnell E. FEBS Lett. 1999; 443: 31-36Crossref PubMed Scopus (100) Google Scholar). The physiological significance of this proteolytic cleavage is currently unclear, although it might be a mechanism of releasing N- and C-terminal domains. How the C terminus of radixin activates Rac1 remains unknown. It is possible that the C-terminal domain of radixin may regulate Rac-specific guanine nucleotide exchange factors (GEFs). One candidate is Tiam, a specific GEF for Rac. Interestingly, CaMKII was shown to activate Tiam (39Buchanan F.G. Elliot C.M. Gibbs M. Exton J.H. J. Biol. Chem. 2000; 275: 9742-9748Abstract Full Text Full Text PDF PubMed Scopus (82) Google Scholar, 40Fleming I.N. Elliott C.M. Buchanan F.G. Downes C.P. Exton J.H. J. Biol. Chem. 1999; 274: 12753-12758Abstract Full Text Full Text PDF PubMed Scopus (141) Google Scholar). Since the C-terminal domain of radixin also induced the autophosphorylation of CaMKII (Fig. 6), it is possible that CaMKII and Tiam are involved in the activation of Rac1. This hypothesis is currently being tested in the laboratory. Activation of CaMKII by C-terminal Domain of Radixin—Because dominant negative Rac1 induced partial inhibition of SRE activity (Fig. 2B), we tested whether other signaling pathways are involved in the regulation of SRE activity induced by the C-terminal domain of radixin. We determined that intracellular calcium chelator BAPTA/AM and CaMK inhibitor KN-93 inhibited SRE activation induced by the C-terminal domain of radixin (Fig. 3). Furthermore, we demonstrated that the dominant negative mutant of CaMKII but not CaMKIV inhibited the SRE activity induced by the C-terminal domain of radixin (Fig. 3). Using the specific antibody against the autophosphorylation site at Thr286 of CaMKII, we determined that both the C-terminal domain of radixin and Gα13Q226L increased the autophosphorylation of CaMKII (Fig. 4). These results provided strong evidence indicating the involvement of CaMKII in SRE activity induced by the C-terminal domain of radixin. Both CaMKII and CaMKIV have been shown to stimulate SRE activity (26Miranti C.K. Ginty D.D. Huang G. Chatila T. Greenberg M.E. Mol. Cell. Biol. 1995; 15: 3672-3684Crossref PubMed Scopus (197) Google Scholar). The mechanism for CaMKIV-mediated SRE-dependent gene transcription had been defined (35Davis F.J. Gupta M. Camoretti-Mercado B. Schwartz R.J. Gupta M.P. J. Biol. Chem. 2003; 278: 20047-20058Abstract Full Text Full Text PDF PubMed Scopus (100) Google Scholar). Thus, CaMKIV phosphorylates transcriptional repressor histone deacetylase and dissociates it from serum response factor, removing this repression molecule from the transcription complex. Recently, CaMKII was shown to use the similar mechanism to stimulate the myocyte enhancer factor-2 transcription factor in neuron cells (41Linseman D.A. Bartley C.M. Le S.S. Laessig T.A. Bouchard R.J. Meintzer M.K. Li M. Heidenreich K.A. J. Biol. Chem. 2003; 278: 41472-441481Abstract Full Text Full Text PDF PubMed Scopus (110) Google Scholar). It is conceivable that CaMK II might use a similar mechanism to activate SRE-dependent gene transcription. Gα13/Radixin Signaling Pathway—Radixin is involved in the signaling pathways regulated by of RhoA, phosphatidylinositol 3-kinase, and tyrosine kinases (17Louvet-Vallee S. Biol. Cell. 2000; 92: 305-316Crossref PubMed Scopus (278) Google Scholar). We have previously reported that activated Gα13, via the N-terminal domain, interacts with radixin and increases radixin binding to F-actin. In the present studies, we have shown that both N-terminal and C-terminal domains were involved in the Gα13-dependent SRE activation (Fig. 1A). Down-regulation of endogenous radixin resulted in the inhibition of SRE activation induced by Gα13Q226L (Fig. 6B). Although Gα13Q226L did not activate Rac1, we showed that the radixin-CaMKII signaling is involved in Gα13-stimulated SRE-dependent gene transcription. The lines of evidence include that (i) BAPTA/AM, KN-93, and dominant negative CaMKII inhibited SRE activation by both the C-terminal domain of radixin and Gα13Q226L (Figs. 3 and 4), (ii) both the C-terminal domain of radixin and Gα13Q226L induced the phosphorylation of CaMKII (Fig. 4), and (iii) down-regulation of radixin using siRNA reduced the phosphorylation of CaMKII induced by Gα13Q226L (Fig. 6). According to the proposed model, Gα13 should be able to activate Rac1 (Fig. 7). However, we did not observe that in the pull-down assay (Fig. 2A). On the another hand, the dominant negative mutant of Rac1(T17N) partially inhibited the Gα13Q226L-mediated SRE gene transcription in the reporter assay (Fig. 2C). This discrepancy could be due to several possibilities. (i) Rac1 activation by Gα13Q226L is cell condition-dependent. Thus, it was reported that stably expressed Gα13Q226L induced Rac1 activation in NIH 3T3 cells (42Radhika V. Onesime D. Ha J.H. Dhanasekaran N. J. Biol. Chem. 2004; 279: 49406-49413Abstract Full Text Full Text PDF PubMed Scopus (114) Google Scholar), suggesting that Gα13Q226L may activate Rac1 under certain cellular conditions. (ii) The small inhibition of dominant negative mutant Rac1 also suggests that Gα13 may activate Rac1, but the activation may be not strong enough to detect it using a pull-down assay. One major reason for small inhibition is that Gα13Q226L activates RhoA, which in turn dominantly stimulates SRE. Therefore, Gα13Q226L may stimulate SRE via three pathways: 1) RhoA; 2) radixin-CaMKII; 3) radixin-Rac1. Considering the three parallel pathways and dominance of RhoA, the radixin-Rac1-stimulated SRE should be relatively small. It should be pointed out that inhibition was significant. (iii) The pull-down assay to assess the direct activation of small G proteins is capable of detecting femtomolar amounts of the activated enzyme. By contrast, the quantitative reporter assay that uses firefly luciferase allows detection of subattomole amounts of enzyme (43Bronstein I. Fortin J. Stanley P.E. Stewart G.S. Kricka L.J. Anal. Biochem. 1994; 219: 169-181Crossref PubMed Scopus (236) Google Scholar). In addition, one of the dominant signalings of Gα13Q226L is the activation of RhoA. It is known that activation of RhoA could inhibit activation of Rac1 (44Yamaguchi Y. Katoh H. Yasui H. Mori K. Negishi M. J. Biol. Chem. 2001; 276: 18977-18983Abstract Full Text Full Text PDF PubMed Scopus (162) Google Scholar). The degree of RhoA activation by Gα13Q226L in different cell conditions may affect Rac1 activation by Gα13Q226L in a dynamic manner. In other words, the Rac1 activation by G13Q226L could be transient, and this would be more difficult to detect by the pull-down assay. By contrast, interference with the function of endogenous Rac1 by the dominant negative mutant could be relatively stable after the mutant is expressed. (iv) While this paper was in revision, a study was published describing that Gα13 mediates reactive oxygen species production by Rac activation (45Fujii T. Onohara N. Maruyama Y. Tanabe S. Kobayashi H. Fukutomi M. Nagamatsu Y. Nishihara N. Inoue R. Sumimoto H. Shibasaki F. Nagao T. Nishida M. Kurose H. J. Biol. Chem. 2005; 280: 23041-23047Abstract Full Text Full Text PDF PubMed Scopus (82) Google Scholar). Direct activation of Rac1 by Gα13 was not shown in this paper. However, the authors determined that an inhibitor of Gα12/13, the Gα12/13-specific regulator of G protein signaling domain of p115RhoGEF, inhibited angiotensin-induced activation of Rac1. (v) It is also possible that Gα13Q226L does not activate Rac1 when transiently transfected in NIH 3T3 cells. If this were the case, Gα13 would not use radixin in the signaling. Instead, Gα13Q226L can activate the downstream CaMKII in a radixin-independent manner. This means that Gα13Q226L and radixin would independently regulate the phosphorylation and activity of CaMKII and then the downstream SRE gene transcription. Our data do not exclude this possibility. Taken together, it should be pointed out that the direct signaling from Gα13 to radixin is likely, but further evidence is needed (Fig. 7), and further studies are also needed to distinguish among the above possibilities. In summary, our studies indicate that radixin stimulates SRE-dependent gene transcription. This activity requires activation of Rac1 and CaMKII by radixin via its C-terminal domain. Our results also suggest that the radixin-CaMKII signaling is involved in Gα13-mediated SRE-dependent gene transcription." @default.
• W2092252912 created "2016-06-24" @default.
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• W2092252912 title "Radixin Stimulates Rac1 and Ca2+/Calmodulin-dependent Kinase, CaMKII" @default.
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