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G Protein Coupled Receptor Signaling Through the Src and Stat3 Pathway: Role in Proliferation and Transformation

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G Protein Coupled Receptor Signaling Through the Src and Stat3 Pathway: Role in Proliferation and Transformation Oncogene (2001) 20, 1601 ± 1606 ã 2001 Nature Publishing Group All rights reserved 0950 ± 9232/01 $15.00 www.nature.com/onc G protein coupled receptor signaling through the Src and Stat3 pathway: role in proliferation and transformation Prahlad T Ram*,1 and Ravi Iyengar1 1Department of Pharmacology, Mount Sinai School of Medicine, New York, NY 10029, USA Extracellular signals when routed through signaling transducin; the Gai family which includes Gai, Gao pathways that use heterotrimeric G proteins can and Gaz; the Gaq/Ga11 family; and the Ga12/13 engage multiple signaling pathways leading to diverse family. As these new Ga subunits were identi®ed the biological consequences. One locus at which signal eectors pathways for these subunits were sought out, sorting occurs is at the level of G proteins. G protein and over the years a number of eector pathways such a-subunits appear to be capable of interacting with as the PLC, Rho/Cdc42 pathways, and the Ca2+ dierent eectors leading to engagement of distinct channels have been identi®ed (Buhl et al., 1995; signaling pathways. Regulation of dierent pathways Diverse-Pierluissi, 1995; rench-Mullen et al., 1994; in turn leads to dierent biological outcomes. The Taylor et al., 1990). In addition to activation of process of neoplastic transformation is controlled to a second messenger molecules, Ga subunits can also large extent through the activation and inhibition of modulate the activity of transcription factors, thereby signaling pathways. Signaling pathways such as the regulating gene expression (Corre et al., 1999; Fan et Ras-MAPK, v-Src-Stat3 pathways are activated in the al., 2000; Montminy, 1997; Ram et al., 2000). So process of transformation. Expression of activated Ga signaling by G protein coupled receptors is not just subunits have been shown to cause transformation of limited to second messenger molecules but also cells. While activation of the MAPK 1,2 pathway by includes transcription factors and molecules that aect various Ga subunits has been reported for several the cytoskeleton. Discovering the full array of down- years, recent studies show the activation and involve- stream eectors for G proteins is an ongoing process ment of Src and Stat3 pathways in Gao and Gai that will continue to yield new and exciting informa- mediated transformation of cells. Recent studies also tion. suggest that both Gai and Gas may be able to Recently the activation of Stat3 by members of interact with and activate Src. The activation of Src the Gai family, particularly Gao and Gai2 has and Stat3 by G proteins has also been demonstrated been identi®ed (Corre et al., 1999; Ram et al., by ligand-induced activation of G protein receptors. 2000). Additionally others have also reported the So increasingly it is becoming clear that the Src and ligand-induced activation of Stat's via activation of Stat3 pathways are potential eectors for G proteins G protein coupled receptors (Liang et al., 1999; and that they may play a role in G protein function. Marrero et al., 1995). The activation of the Stat Oncogene (2001) 20, 1601 ± 1606. pathway by Ga subunits appears to be mediated via Src. The modulation of a transcriptional Keywords: G protein alpha subunit; Src; Stat3; cofactor by Gaz has also been reported (Fan et transformation al., 2000). Taken together with the classical Gas?cAMP?PKA?CREB pathway it appears that in addition to regulation of cytoplasmic and Introduction membrane functions Ga subunits also regulate gene expression. Signal transduction pathways activated by G proteins The role of G protein a subunits in the neoplastic have been studied for a number of years. The classical transformation of cells has been studied for a number G protein signaling pathway that was identi®ed very of years. Expression of activated Gao, ai2, aq, a12, and early on was the activation of the adenylyl cyclase- a13, has been shown to cause transformation of cells cAMP pathway by Gas (Gilman, 1987). Subsequently (Jiang et al., 1993; Kalinec et al., 1992; Kroll et al., the inhibition of adenylyl cyclase by the Gai subunit 1992; Pace et al., 1991; Vara Prasad et al., 1994). was determined. Since these early discoveries several Additionally expression of constitutively activated G other Ga subunits as well as several isoforms of Gb protein receptors have also been shown to cause and Gg subunits have been characterized. The Ga transformation of cells (Allen et al., 1991; Arvanitakis subunits can be broadly classi®ed into four families: et al., 1997; Cesarman et al., 1996) Therefore, under- the Gas family including Gas, Gaolf, and a standing the signaling mechanism leading to the transformation of cells by G protein a subunits and G protein coupled receptor pathways will be very *Correspondence: PT Ram important. G protein regulation of Src and Stat's in transformation PT Ram and R Iyengar 1602 Eectors for Gao and Gai2 and Stat3 in the transformation of cells (Corre et al., 1999) these data suggest that Gai2 as well Gaocan Among the Ga subunits, the Gao subunit has been play a role in the proliferation of cells. Their role in more dicult to study in terms of eector regulation. cell proliferation may be quite important in tumors of Gao belongs to the Gai family of G protein a subunits neuroendocrine origin such as in melanomas, where and shares about an 82% homology with Gai and is both Gai2 and Stat3 have been shown to regulate pertussis toxin sensitive (Neer et al., 1984; Sternweis proliferation and transformation (Hermouet et al., and Robishaw, 1984; Van Meurs et al., 1987). The 1996; Niu et al., 1999). tissue distribution of Gao is quite interesting in that Gao is abundantly expressed in neuronal tissue (Gierschik et al., 1986). Intracellularly, Gao is found Role of Src and Stat3 in oncogenesis localized in the growth cones of neuronal tissue, suggesting a role for Gao in neuronal function (Nusse c-Src is a member of a family of cytoplasmic tyrosine and Neer, 1996). The constitutively activated Gaoin kinases that are involved in many biological processes which Gln 205 is changed to Leu (Q205L), thereby (Thomas and Brugge, 1997). Activities of the src family resulting in a mutant Gao subunit which lacks of kinases have been implicated in proliferation, guanosine triphosphatase (GTPase) activity, has migration and dierentiation. The src family members greatly aided in the analysis of Gao function. are 52 ± 62 kDa proteins that have several domains Expression of activated GaoinXenopus oocytes including a catalytic domain, a regulatory domain, and triggers the oocyte to re-enter the cell cycle through SH2 and SH3 binding domains (Thomas and Brugge, the protein kinase C, c-mos dependent pathway (Kroll 1997). c-Src in its inactive form is phosphorylated at et al., 1991). Expression of activated Gao results in the Tyr-527 and interacts with its own SH2 domain, thus transformation of NIH3T3 cells (Kroll et al., 1992), masking its catalytic domain (Brown and Cooper, and it has also been demonstrated that expression of 1996). Upon activation c-Src is dephosphorylated at Gao in PC-12 cells results in increased neurite Tyr-527 and no longer interacts with its own SH2 outgrowth (Strittmatter et al., 1994). Gao has also domain, resulting in a conformational change which been shown to play a role in vesicle release in then activates its catalytic domain (Brown and Cooper, chroman cells (Ohara-Imaizumi et al., 1992; Sontag 1996). Activated c-Src is then capable of interacting et al., 1991) and modulation of Ca2+ channels in chick with and activating several substrates. Data from dorsal root ganglion (DRG) neurons (Diverse-Pierluissi several labs have shown that both v-Src and c-Src et al., 1997). While these physiological readouts have are capable of activating Stat3 in ®broblasts (Bromberg been observed for several years the downstream et al., 1998; Turkson et al., 1999; Yu et al., 1995). signaling mechanisms by which Gao regulates these The signal transducers and activators of transcrip- functions were not well understood. tion (Stat) family of proteins are implicated in the Over the years a few downstream eectors of Gao functions of a wide range of cells (Akira, 2000; have been discovered. The PLC/PKC pathway has Bromberg and Darnell, 2000). Stat proteins are been found to be activated during Xenopus germinal activated in response to several cytokines and growth vesicle breakdown (Kroll et al., 1991), and the Src factors. The classical example of Stat activation is via tyrosine kinase pathways in the activation of Ca2+ the interluekin/gp130 receptor, which is activated by Il- channels in chick DRG neurons (Diverse-Pierluissi et 6. Il-6 binding activates the receptor leading to al., 1997). The signaling pathways involved in the Gao recruitment of Janus kinases (Jak's). Jak activation induced transformation of NIH3T3 have been shown then results in binding, phosphorylation and activation to be by the Src and the Stat3 pathways (Ram et al., of Stats. When phosphorylated Stat3 is activated, it 2000). Direct binding partners of Gao include Rap1- dimerizes, and translocates to the nucleus where it GAP and GRIN (Chen et al., 1999; Jordan et al., binds DNA and modulates gene expression (Schindler 1999) and Darnell, 1995). Receptor tyrosine kinases (RTK) The role of the Gai subunit in transformation has such as PDGF-R and EGF-R also activate Stat3 been observed for several years. Gai2 has been (Zhong et al., 1994). Stat3 has been implicated in the implicated in ovarian and pituitary tumors (Lyons et neoplastic transformation of several cell types, and al., 1990). The mutant form of Gai2, which is thought transformation of NIH3T3 and mammary epithelial to be oncogenic, was termed gip2 and was found to be cells by the oncogene v-src is dependent on Stat3 over expressed in a small subset of ovarian tumors activation (Bowman et al., 2000; Bromberg et al., 1998; (Lyons et al., 1990), however this does not appear to Smith and Crompton, 1998), and further, expression of be widespread as other populations of ovarian tumors constitutively activated Stat3 itself results in transfor- have failed to show expression of gip2 (Shen et al., mation (Bromberg et al., 1999).
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