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Gi-Mediated Stimulation of Type II Adenylyl Cyclase Is Augmented by G,-Coupled Receptor Activation and Phorbol Ester Treatment

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Gi-Mediated Stimulation of Type II Adenylyl Cyclase Is Augmented by G,-Coupled Receptor Activation and Phorbol Ester Treatment The Journal of Neuroscience, February 15, 1996, 76(4):1317-l 323 Gi-Mediated Stimulation of Type II Adenylyl Cyclase Is Augmented by G,-Coupled Receptor Activation and Phorbol Ester Treatment Rachel C. Tsu and Yung H. Wong Department of Biology, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong Synergism between G,- and Gi- or G,-dependent signaling Activation of protein kinase C (PKC) thus appears to relieve the pathways has been demonstrated in the stimulation of type II requirement for the presence of activated 01,. Stimulation of adenylyl cyclase (AC-II). Provision of activated 01, is known to PKC via G,-coupled receptors also allowed G,-coupled recep- allow numerous Gi-coupled receptors to stimulate AC-II and to tors to activate AC-II. Coexpression of the ml muscarinic potentiate the responses to G,-coupled receptors. To explore receptor with the dopamine-D, receptor permitted dopamine to possible interactions between Gi- and G,-coupled receptors stimulate AC-II in the presence of carbachol. The phorbol ester- that are independent of (Y*, the activity of AC-II was determined permissive and as-independent stimulation was mediated by after the activation of Gi- and G,-regulated pathways. Human G-protein Pr subunits because it was blocked by the Pr scav- embryonic kidney 293 cells were transiently cotransfected with engers O(~ and /3-adrenergic receptor kinase. These results cDNAs encoding AC-II and various G-protein-coupled recep- show that AC-II can efficiently integrate signals generated by tors. Agonist-bound G,-coupled receptors (including the formyl G,- and G,-coupled receptors via a mechanism that is inde- peptide, dopamine-D,, and S-opioid receptors) stimulated pendent of G,. AC-II activity in the absence of activated a,, provided that the Key words: adenylyl cyclase; CAMP; G-proteins; phorbol es- cells were treated with 100 nM phorbol 12-myristate 13-acetate. ter: protein kinase C; signal transduction Signal processing is a complex and vital function of the nervous AC-II can also be activated by external signals that are routed system. Many external signals in the form of neurotransmitters through protein kinase C (PKC). Both phorbol esters (Jacobowitz and hormones have to be integrated and processed by the neu- and Iyengar, 1994) and agonists that act on G,-coupled receptors rons. An example of how intracellular macromolecules convert (Lustig et al., 1993) are known to stimulate AC-II. These stimu- extracellular signals into a unified message is given by the type II latory effects are attributed to the activation of PKC. It has been isoform of adenylyl cyclase (AC-II), which is abundant in the brain shown that type II as well as type VII adenylyl cyclases are (Feinstein et al., 1991). AC-II is known to process coincident activated after phosphorylation by PKC (Jacobowitz et al., 1993; signals from receptors that are coupled to G,-, G,-, or G,-proteins Watson et al., 1995). The phorbol ester-induced stimulation of (Lustig et al., 1993). Like the other adenylyl cyclase isoforms, the AC-II is distinct from that seen with o(, and Pr subunits, and type II enzyme can be directly stimulated by the GTP-bound cy synergistic effects arising from the two pathways have been re- subunit of G, (Tang and Gilman, 1992). Activation of AC-II via ported (Lustig et al., 1993). Although acting via different mecha- the Gi pathway is more complex. In the current mechanistic nisms, signals generated from G,- and G,-coupled receptors nev- model, activation of a G,-coupled receptor leads to the release of ertheless can converge on the AC-II. In the present investigation, Pr subunits from Gi, and the freed Pr subunits can then stimulate we asked whether AC-II can integrate coincident signals from Gi- AC-II. However, it was found that the presence of activated G,, and G,-coupled receptors. Our results indicate that receptors is absolutely required for the /?y subunits to stimulate AC-II coupled to Gi- and G,-proteins can stimulate AC-II in a syner- (Federman et al., 1992). Thus, when both G,- and G,-regulated gistic manner, thereby providing another level of complexity in the pathways are simultaneously stimulated, the activity of AC-II is regulation of intracellular CAMP. enhanced. Among the various G,-coupled receptors, the dopamine-D,, adenosine-A,, p- and S-opioid, melatonin-lc, com- MATERIALS AND METHODS plement factor C5a, and formyl peptide receptors are able to Reu,qents. cDNAs encoding the human N-formylmethionyl-leucyl- stimulate the AC-II in the presence of activated G,, (Federman et pheiylalanine (fMLP) receptor (in the pCDM8 vecto;) and the-&opidid al., 1992; Tsu et al., 1995a,b; Yung et al., 1995; Chan et al., 1995). recentor (in the DCDMS vector) were urovided bv F. Boulav fLBIO/ Activation of the G,-coupled pathway alone does not stimulate the Lab&atoGe, Greioble, France) and Chris Evans (cniversity oi kalifor- nia, Los Angeles, CA), respectively. The AC-II cDNA was provided by type II activity at all. Recent studies suggest that the G,-proteins Randall Reed (The Johns Hopkins University, Baltimore, MD). The can exert an inhibitory influence on the type II enzyme (Chen and p-adrenergic receptor kinase 495-690 (/3ARK4Y5m(,q0) minigene was a gift Iyengar, 1993). from Robert Lefkowitz (Duke University Medical Center, Chapel Hill, NC). The origin and construction of other cDNAs have been described Received Oct. 12, 1995; revised Nov. 20, 1995; accepted Nov. 28, 1995. previously (Wong et al., 1991, 1992). Pertussis toxin (PTX) was purchased This work was supported by Grants RIG92193SCOS and HKUST 169193 M from from List Biological Laboratories (Campbell, CA). Human embryonic the Universitv and Grants Committee of Hone Kong. We thank Francois Boulav for kidney 293 cells (293 cells hereafter) were obtained from the American ” ” i the human fMLP-receptor cDNA, Chris Evans for the S-opioid receptor, Robert Type Culture Collection (CRL-1573; Rockville, MD). [“H]Adenine was Lefkowitz for the PARK fragment, and Randall Reed for the AC-II. purchased from Amersham (Buckinghamshire, UK). Plasmid purification Correspondence should be addressed to Yung H. Wong at the above address. columns were obtained from Qiagen (Hilden, Germany). Staurosporin Copyright 0 1996 Society for Neuroscience 0270-6474/96/161317-07$05.00/O was purchased from Research Biochemicals (Natick, MA). Cell culture 1318 J. Neurosci., February 15, 1996, 76(4):1317-1323 Tsu and Wong l Stimulation of Type II Adenylyl Cyclase by G, and PMA reagents were obtained from Life Technologies (Gaithersburg, MD), and all other chemicals were purchased from Sigma (St. Louis, MO). Cell culture and transfection. The 293 cells were maintained in Eagle’s minimum essential medium (MEM) supplemented with 10% fetal calf serum (v/v), 50 U/ml penicillin, and 50 pg/ml streptomycin in a humidi- fied atmosphere at 37°C in 5% CO,. COS-7 cells were kept in DMEM containing 10% fetal calf serum. DEAE-dextran-mediated transfection of -zs 5 w 293 and COS-7 cells on 12.well plates has been described previously (Tsu z 0 et al., 1995a). All cDNAs used in the transfection were purified by Qiagen 2 PTX - - + - + - III chromatography. u CAMP accumulation. Twenty-four hours after transfection, 293 cells a,-QL PMA 4-CL-PMA were labeled with [3H]adenine (1 @/ml) in growth medium for 16-20 hr with or without PTX (100 ngiml). The labeled cells were rinsed once with Figure 1. fMLP-induced stimulation of AC-II in the presence of ol,- 2 ml of assay medium (MEM containing 20 mM HEPES, pH 7.4) Q227L or with PMA treatment. The 293 cells were cotransfected with and incubated at 37°C for 30 min with 1 ml of assay medium containing cDNAs encoding the fMLP receptor (0.25 wg/ml) and AC-II (0.25 pg/ml), 1 InM 1-methyl-3-isobutylxanthine and the indicated drugs. Intracellular with or without a,-Q227L (CZ-QL; 0.025 pg/ml). As indicated, transfected [3H]cAMP was isolated by sequential chromatography as described pre- cells were exposed to different conditions before assaying for CAMP viously (Saloman et al., 1974; Wong, 1994). The level of [“HIcAMP was accumulation in response to fMLP (200 nM). Where indicated, PTX (100 estimated by determining the ratios of [3H]cAMP to total [3H]ATP and ngiml) was administered to cells during their labeling with [3H]adenine. [‘H]ADP pools as reported previously (Wong et al., 1991). Absolute Cells were treated with either PMA (100 nM) or I-c-PM (100 nM) for 10 values for CAMP levels varied between experiments, but variability within min before stimulation by fMLP. CAMP accumulation was performed in any single experiment was generally <lo%. the presence of 20 mM HEPES and 1 mM 3-isobutyl-1-methylxanthine. Data shown represent the mean i SD of triplicate determinations in a RESULTS single experiment; two additional experiments yielded similar results. Phorbol 12-myristate 13-acetate allows G,-coupled Asterisks, fMLP significantly stimulated CAMP accumulation above the receptors to stimulate AC-II in the absence of basal value; paired t test, p < 0.05. activated G,cw We and others have shown previously that many G,-coupled stimulate AC-II in the presence, but not in the absence, of receptors can activate AC-II via the /3r subunits released from Gi activated a,. In 293 cells coexpressing AC-II and either the (Federman et al., 1992; Tsu et al., 1995a,b; Yung et al., 1995; Chan dopamine-D, or the 6-opioid receptor, no agonist-induced stim- et al., 1995). For /3r subunits to stimulate AC-II, the GTP-bound ulation of AC-II was observed (Fig.
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