Abstract
The native ligand for the G protein-coupled bombesin receptor subtype-3 (BRS-3) has currently not been identified. Studies in mice showed robust BRS-3 expression in the hypothalamic satiety centers, and genetic receptor inactivation resulted in obesity, diabetes, and hypertension. BRS-3 was also detected in normal human pancreatic islet cells suggesting a critical role of BRS-3 in regulating energy metabolism and satiety via central and peripheral mechanisms of action. The cyclic AMP response element binding protein (CREB) is a main regulator of pancreatic β-cell gene expression required for glucose homeostasis and islet cell survival, and hypothalamic regulation of satiety. Therefore, in this study we examined whether agonist-dependent hBRS-3 stimulation mediates CREB activation. A selective hBRS-3 peptide agonist and two non-selective hBRS-3 peptide agonists were used to activate ectopically expressed hBRS-3. Stimulation with hBRS-3 peptide agonists resulted in transient calcium mobilization, whereby the selective peptide agonist acted exclusively via hBRS-3 but not through the gastrin-releasing peptide receptor (GRP-R). A selective high-affinity GRP-R antagonist did not inhibit hBRS-3-mediated calcium signals. We also found time-dependent CREB phosphorylation in response to the selective hBRS-3 activation, which was abrogated by pretreatment with protein kinase A and protein kinase C inhibitors. Human BRS-3 agonists also stimulated CREB transactivation and resulted in modest increases of CRE-dependent gene transcription. These changes were significantly reduced after pretreatment with inhibitors of PKA, PKC, and MEK-1. Thus, our results suggest that hBRS-3 agonist-dependent signaling mediates CREB phosphorylation and transactivation through partially PKA, PKC, and MEK-1 pathways.
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Abbreviations
- Bn:
-
Bombesin
- Bn-r:
-
Bombesin receptors
- BRS-3:
-
Bombesin receptor subtype-3
- GRP-R:
-
Gastrin-releasing peptide receptor
- CREB:
-
Cyclic AMP response element binding protein
- DMEM:
-
Dulbecco’s minimum essential medium
- MAPK:
-
Mitogen-activated protein kinase
- MEK-1:
-
Mitogen-activated protein/extracellular regulated kinase kinase
- NMB-R:
-
Neuromedin B receptor
- PKA:
-
Protein kinase A
- PKC:
-
Protein kinase C
References
Arias J, Alberts AS, Brindle P et al (1994) Activation of cAMP and mitogen responsive genes relies on a common nuclear factor. Nature 370(6486):226–229
Branson R, Potoczna N, Kral JG, Lentes KU, Hoehe MR, Horber FF (2003) Binge eating as a major phenotype of melanocortin 4 receptor gene mutations. N Engl J Med 348(12):1096–1103
Brindle P, Linke S, Montminy M (1993) Protein-kinase-A-dependent activator in transcription factor CREB reveals new role for CREM repressors. Nature 364(6440):821–824
Coll AP (2010) Treating obesity? It’s in the bag! Cell Metab 11(2):95–96
Dalle S, Longuet C, Costes S et al (2004) Glucagon promotes cAMP-response element-binding protein phosphorylation via activation of ERK1/2 in MIN6 cell line and isolated islets of Langerhans. J Biol Chem 279(19):20345–20355
Eckert B, Schwaninger M, Knepel W (1996) Calcium-mobilizing insulin secretagogues stimulate transcription that is directed by the cyclic adenosine 3′,5′-monophosphate/calcium response element in a pancreatic islet beta-cell line. Endocrinology 137(1):225–233
Farooqi IS, Keogh JM, Yeo GS, Lank EJ, Cheetham T, O’Rahilly S (2003) Clinical spectrum of obesity and mutations in the melanocortin 4 receptor gene. N Engl J Med 348(12):1085–1095
Fathi Z, Corjay MH, Shapira H et al (1993) BRS-3: a novel bombesin receptor subtype selectively expressed in testis and lung carcinoma cells. J Biol Chem 268(8):5979–5984
Fathi Z, Way JW, Corjay MH, Viallet J, Sausville EA, Battey JF (1996) Bombesin receptor structure and expression in human lung carcinoma cell lines. J Cell Biochem Suppl 24:237–246
Fleischmann A, Laderach U, Friess H, Buechler MW, Reubi JC (2000) Bombesin receptors in distinct tissue compartments of human pancreatic diseases. Lab Invest 80(12):1807–1817
Gorbulev V, Akhundova A, Buchner H, Fahrenholz F (1992) Molecular cloning of a new bombesin receptor subtype expressed in uterus during pregnancy. Eur J Biochem 208(2):405–410
Gorbulev V, Akhundova A, Grzeschik KH, Fahrenholz F (1994) Organization and chromosomal localization of the gene for the human bombesin receptor subtype expressed in pregnant uterus. FEBS Lett 340(3):260–264
Guan XM, Chen H, Dobbelaar PH et al (2010) Regulation of energy homeostasis by bombesin receptor subtype-3: selective receptor agonists for the treatment of obesity. Cell Metab 11(2):101–112
Guan XM, Metzger JM, Yang L et al (2011) Antiobesity effect of MK-5046, a novel bombesin receptor subtype-3 agonist. J Pharmacol Exp Ther 336(2):356–364
Guo C, Guzzo PR, Hadden M et al (2010) Synthesis of 7-benzyl-5-(piperidin-1-yl)-6,7,8,9-tetrahydro-3H-pyrazolo[3,4-c][2,7]naph thyridin-1-ylamine and its analogs as bombesin receptor subtype-3 agonists. Bioorg Med Chem Lett 20(9):2785–2789
Hadden M, Goodman A, Guo C et al (2010) Synthesis and SAR of heterocyclic carboxylic acid isosteres based on 2-biarylethylimidazole as bombesin receptor subtype-3 (BRS-3) agonists for the treatment of obesity. Bioorg Med Chem Lett 20(9):2912–2915
He S, Dobbelaar PH, Liu J et al (2010) Discovery of substituted biphenyl imidazoles as potent, bioavailable bombesin receptor subtype-3 agonists. Bioorg Med Chem Lett 20(6):1913–1917
Hou X, Wei L, Harada A, Tatamoto K (2006) Activation of bombesin receptor subtype-3 stimulates adhesion of lung cancer cells. Lung Cancer 54(2):143–148
Huszar D, Lynch CA, Fairchild-Huntress V et al (1997) Targeted disruption of the melanocortin-4 receptor results in obesity in mice. Cell 88(1):131–141
Jennings CA, Harrison DC, Maycox PR, Crook B, Smart D, Hervieu GJ (2003) The distribution of the orphan bombesin receptor subtype-3 in the rat CNS. Neuroscience 120(2):309–324
Jensen RT, Battey JF, Spindel ER, Benya RV (2008) International Union of Pharmacology. LXVIII. Mammalian bombesin receptors: nomenclature, distribution, pharmacology, signaling, and functions in normal and disease states. Pharmacol Rev 60(1):1–42
Jhala US, Canettieri G, Screaton RA et al (2003) cAMP promotes pancreatic beta-cell survival via CREB-mediated induction of IRS2. Genes Dev 17(13):1575–1580
Kuiper P., Verspaget H.W., Biemond I., et al. (2010) Expression and ligand binding of bombesin receptors in pulmonary and intestinal carcinoids. The role of bombesin in carcinoids. J Endocrinol Invest [Epub ahead of print].
Kwok RP, Lundblad JR, Chrivia JC et al (1994) Nuclear protein CBP is a coactivator for the transcription factor CREB. Nature 370(6486):223–226
Ladenheim EE, Hamilton NL, Behles RR et al (2008) Factors contributing to obesity in bombesin receptor subtype-3-deficient mice. Endocrinology 149(3):971–978
Lee JY, Lee JH, Kim DG, Jahng JW (2003) Dexamethasone blocks the refeeding-induced phosphorylation of cAMP response element-binding protein in the rat hypothalamus. Neurosci Lett 344(2):107–111
List JF, Habener JF (2003) Defective melanocortin 4 receptors in hyperphagia and morbid obesity. N Engl J Med 348(12):1160–1163
Liu J, Lao ZJ, Zhang J et al (2002a) Molecular basis of the pharmacological difference between rat and human bombesin receptor subtype-3 (BRS-3). Biochemistry 41(28):8954–8960
Liu W, Chin-Chance C, Lee EJ, Lowe WL Jr (2002b) Activation of phosphatidylinositol 3-kinase contributes to insulin-like growth factor I-mediated inhibition of pancreatic beta-cell death. Endocrinology 143(10):3802–3812
Liu J, He S, Jian T et al (2010) Synthesis and SAR of derivatives based on 2-biarylethylimidazole as bombesin receptor subtype-3 (BRS-3) agonists for the treatment of obesity. Bioorg Med Chem Lett 20(7):2074–2077
Lo MM, Chobanian HR, Palyha O et al (2011) Pyridinesulfonylureas and pyridinesulfonamides as selective bombesin receptor subtype-3 (BRS-3) agonists. Bioorg Med Chem Lett 21(7):2040–2043
Maekawa F, Quah HM, Tanaka K, Ohki-Hamazaki H (2004) Leptin resistance and enhancement of feeding facilitation by melanin-concentrating hormone in mice lacking bombesin receptor subtype-3. Diabetes 53(3):570–576
Mantey SA, Weber HC, Sainz E et al (1997) Discovery of a high affinity radioligand for the human orphan receptor, bombesin receptor subtype 3, which demonstrates that it has a unique pharmacology compared with other mammalian bombesin receptors. J Biol Chem 272(41):26062–26071
Mantey SA, Coy DH, Pradhan TK et al (2001) Rational design of a peptide agonist that interacts selectively with the orphan receptor, bombesin receptor subtype 3. J Biol Chem 276(12):9219–9229
Mantey SA, Entsuah L, Coy DH et al (2002) Identification of a selective agonist for the orphan receptor, BRS-3. Gastroenterology 122(4, Supplement):A-135
Mantey SA, Coy DH, Entsuah LK, Jensen RT (2004) Development of bombesin analogs with conformationally restricted amino acid substitutions with enhanced selectivity for the orphan receptor human bombesin receptor subtype 3. J Pharmacol Exp Ther 310(3):1161–1170
Matsumoto K, Yamada K, Wada E, Hasegawa T, Usui Y, Wada K (2003) Bombesin receptor subtype-3 modulates plasma insulin concentration. Peptides 24(1):83–90
Mayr B, Montminy M (2001) Transcriptional regulation by the phosphorylation-dependent factor CREB. Nat Rev Mol Cell Biol 2(8):599–609
Metzger JM, Gagen K, Raustad KA et al (2010) Body temperature as a mouse pharmacodynamic response to bombesin receptor subtype-3 agonists and other potential obesity treatments. Am J Physiol Endocrinol Metab 299(5):E816–E824
Must A, Spadano J, Coakley EH, Field AE, Colditz G, Dietz WH (1999) The disease burden associated with overweight and obesity. JAMA 282(16):1523–1529
Nakamichi Y, Wada E, Aoki K et al (2004) Functions of pancreatic beta cells and adipocytes in bombesin receptor subtype-3-deficient mice. Biochem Biophys Res Commun 318(3):698–703
Oetjen E, Diedrich T, Eggers A, Eckert B, Knepel W (1994) Distinct properties of the cAMP-responsive element of the rat insulin I gene. J Biol Chem 269(43):27036–27044
Ohki-Hamazaki H, Watase K, Yamamoto K et al (1997) Mice lacking bombesin receptor subtype-3 develop metabolic defects and obesity. Nature 390(6656):165–169
Porcher C, Juhem A, Peinnequin A, Bonaz B (2005) Bombesin receptor subtype-3 is expressed by the enteric nervous system and by interstitial cells of Cajal in the rat gastrointestinal tract. Cell Tissue Res 320(1):21–31
Pradhan TK, Katsuno T, Taylor JE et al (1998) Identification of a unique ligand which has high affinity for all four bombesin receptor subtypes. Eur J Pharmacol 343(2–3):275–287
Qu X, Xiao D, Weber HC (2002) Human gastrin-releasing peptide receptor mediates sustained CREB phosphorylation and transactivation in HuTu 80 duodenal cancer cells. FEBS Lett 527(1–3):109–113
Reubi JC, Wenger S, Schmuckli-Maurer J, Schaer JC, Gugger M (2002) Bombesin receptor subtypes in human cancers: detection with the universal radioligand (125)I-[D-TYR(6), beta-ALA(11), PHE(13), NLE(14)] bombesin(6–14). Clin Cancer Res 8(4):1139–1146
Ryan RR, Weber HC, Hou W et al (1998a) Ability of various bombesin receptor agonists and antagonists to alter intracellular signaling of the human orphan receptor BRS-3. J Biol Chem 273(22):13613–13624
Ryan RR, Weber HC, Mantey SA et al (1998b) Pharmacology and intracellular signaling mechanisms of the native human orphan receptor BRS-3 in lung cancer cells. J Pharmacol Exp Ther 287(1):366–380
Sancho V, Moody TW, Mantey SA et al (2010) Pharmacology of putative selective hBRS-3 receptor agonists for human bombesin receptors (BnR): affinities, potencies and selectivity in multiple native and BnR transfected cells. Peptides 31(8):1569–1578
Schulz S, Rocken C (2006) Immunohistochemical detection of bombesin receptor subtypes GRP-R and BRS-3 in human tumors using novel antipeptide antibodies. Virchows Arch 449(4):421–427
Sheriff S, Chance WT, Fischer JE, Balasubramaniam A (1997) Neuropeptide Y treatment and food deprivation increase cyclic AMP response element-binding in rat hypothalamus. Mol Pharmacol 51(4):597–604
Shimizu-Albergine M, Ippolito DL, Beavo JA (2001) Downregulation of fasting-induced cAMP response element-mediated gene induction by leptin in neuropeptide Y neurons of the arcuate nucleus. J Neurosci 21(4):1238–1246
Spiegelman BM, Flier JS (2001) Obesity and the regulation of energy balance. Cell 104(4):531–543
Tan YR, Qi MM, Qin XQ et al (2006) Wound repair and proliferation of bronchial epithelial cells enhanced by bombesin receptor subtype 3 activation. Peptides 27(7):1852–1858
Tan YR, Qin XQ, Xiang Y et al (2007) PPARalpha and AP-2alpha regulate bombesin receptor subtype 3 expression in ozone-stressed bronchial epithelial cells. Biochem J 405(1):131–137
Wang Y, Zhang M, Tan Y et al (2007) BRS-3 activation transforms the effect of human bronchial epithelial cells from PGE2 mediated inhibition to TGF-beta1 dependent promotion on proliferation and collagen synthesis of lung fibroblasts. Cell Biol Int 31(12):1495–1500
Weber HC, Hampton LL, Jensen RT, Battey JF (1998) Structure and chromosomal localization of the mouse bombesin receptor subtype 3 gene. Gene 211(1):125–131
Weber HC, Walters J, Leyton J et al (2001) A bombesin receptor subtype-3 peptide increases nuclear oncogene expression in a MEK-1 dependent manner in human lung cancer cells. Eur J Pharmacol 412(1):13–20
Wu JM, Nitecki DE, Biancalana S, Feldman RI (1996) Discovery of high affinity bombesin receptor subtype 3 agonists. Mol Pharmacol 50(5):1355–1363
Xiao D, Wang J, Hampton LL, Weber HC (2001) The human gastrin-releasing peptide receptor gene structure, its tissue expression and promoter. Gene 264(1):95–103
Yamada K, Wada E, Imaki J, Ohki-Hamazaki H, Wada K (1999) Hyperresponsiveness to palatable and aversive taste stimuli in genetically obese (bombesin receptor subtype-3-deficient) mice. Physiol Behav 66(5):863–867
Yamada K, Ohki-Hamazaki H, Wada K (2000) Differential effects of social isolation upon body weight, food consumption, and responsiveness to novel and social environment in bombesin receptor subtype-3 (BRS-3) deficient mice. Physiol Behav 68(4):555–561
Acknowledgments
We thank Dr. G. Yaney and Jamie Fairbanks (Boston University) for their invaluable assistance with the intracellular calcium measurements. Grant Support: This work was supported in part by a National Cancer Center Fellowship (to X.Q.) and NIH grant DK46200.
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Qin, X., Qu, X., Coy, D. et al. A Selective Human Bombesin Receptor Subtype-3 Peptide Agonist Mediates CREB Phosphorylation and Transactivation. J Mol Neurosci 46, 88–99 (2012). https://doi.org/10.1007/s12031-011-9675-3
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DOI: https://doi.org/10.1007/s12031-011-9675-3