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Galanin Decreases Proliferation of PC12 Cells and Induces Apoptosis Via Its Subtype 2 Receptor (Galr2)

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Galanin Decreases Proliferation of PC12 Cells and Induces Apoptosis Via Its Subtype 2 Receptor (Galr2) Galanin decreases proliferation of PC12 cells and induces apoptosis via its subtype 2 receptor (GalR2) R. Tofighi*, B. Joseph*, S. Xia†, Z.-Q. D. Xu†, B. Hamberger‡,T.Ho¨ kfelt†§, and S. Ceccatelli*§ *Institute of Environmental Medicine, Division of Toxicology and Neurotoxicology, and †Department of Neuroscience, Karolinska Institutet, and ‡Department of Surgical Sciences, Section of Surgery, Karolinska University Hospital, SE-17177 Stockholm, Sweden Contributed by T. Ho¨kfelt, December 31, 2007 (sent for review December 8, 2007) Galanin is a neuropeptide with a wide range of effects in the GalR2 may inhibit cAMP accumulation, through Gi/o-type re- nervous and endocrine systems, mediated through three G ceptor and stimulate mitogen-activated protein kinase mediated protein-coupled receptor subtypes (GalR1–3). Interestingly, ga- via Go (14–17). lanin and its receptors are also expressed in certain tumors. Here Interestingly, recent findings have shown that the GalR2 we studied the effects of galanin in rat pheochromocytoma mediates apoptosis in SH-SY5Y neuroblastoma cells (20) and (PC12) cells stably transfected with GFP-tagged GalR2. Galanin at initiates multiple signaling pathways in small cell lung cancer 100 nM inhibited cell proliferation in both nontransfected and cells (21). In light of these data pointing to a critical role of transfected cells. Conversly, both galanin and the GalR2(R3)- GalR2 in tumor cell proliferation and survival, we have inves- agonist AR-M1896 induced caspase-dependent apoptotic cell tigated the potential effects of galanin on rat pheochromocy- death only in GalR2-transfected cells. Western-blot analyses of toma PC12 and GFP-tagged GalR2-transfected PC12 cells. downstream mediators of the Gq/11-type G protein showed Pheochromocytomas are catecholamine-producing tumors orig- down-regulation of pAkt and pBad in galanin-exposed trans- inating from neural crest and arising from the adrenal medulla fected cells. Also, the specific PI3 kinase inhibitor LY-294002 (22, 23). Up to a third of patients may have no symptoms, hence increased the level of pBad and decreased activation of caspases. either being discovered incidentally or found postmortally at In addition, p21cip1 levels were up-regulated in galanin-exposed autopsy (22, 24–26). To check the possible relevance of our PC12 cells and down-regulated in galanin-exposed GalR2-trans- experimental findings on PC12 cells for human pathology, we fected cells. In agreement, FACS analyses of galanin exposed also quantified galanin and its three receptors in human pheo- cells showed occurrence of cell cycle arrest in PC12 cells and cell chromocytoma tumor and postmortem adrenal medulla tissues death in transfected cells. Finally, as shown with real-time PCR, by real-time PCR. galanin and its receptors were expressed at very high levels in human pheochromocytoma tissues as compared with normal Results adrenal medulla. These findings point to GalR2 as a possible Effects of Galanin. Exposure to 100 nM galanin alone significantly target for therapeuthic interventions in pheochromocytoma. inhibited cell proliferation in both nontransfected and trans- fected cells as observed with trypan blue staining (Fig. 1A). To adrenal medulla ͉ galanin receptor ͉ neuropeptide ͉ pheochromocytoma ͉ evaluate nuclear morphology, control and galanin-exposed cells tumor were fixed and stained with Hoechst dye 33358. Galanin-exposed GalR2-transfected cells showed a significant increase in apopto- alanin is a 29-aa neuropeptide with a widespread distribu- tic nuclei, whereas PC12 cells showed a modest but not signif- Gtion in the nervous system (1) involved in nociception (2–4), icant increase (Fig. 1 B and D–G). Moreover, exposure of cells metabolism and reproduction (5, 6), survival and regeneration to 100 nM AR-M1896, a GalR2 agonist, significantly increased (7), Alzheimer’s disease (8), and epilepsy (9). the number of apoptotic nuclei only in GalR2-transfected cells, Recent findings suggest an involvement of galanin and its further supporting the hypothesis that galanin induces apoptosis receptors in regulation of cell proliferation and survival of mainly through GalR2 (Fig. 1B). We used real-time PCR to several types of tumors, including pheochromocytomas (10). measure the expression levels of galanin and its receptors in Also, other peptides can influence tumor proliferation, and their transfected versus nontransfected cells. The expression levels of ϭ ϭ ϭ levels have been correlated with tumor stage and prognosis (11). R1 (CT 28.3), R2 (CT 26.5), and R3 (CT 28.3) in PC12 Both neuroendocrine (12) and nonendocrine tumors, such as cells were used as controls. In GalR2-transfeced PC12 cells, the ϭ ϭ meningiomas, gliomas, and several peripheral cancers (13), expression levels of R1 (CT 28.5), and R3 (CT 28.3), were synthesize a variety of neuropeptides and express peptide re- not significantly different from the nontransfected cells; how- ceptors. The presence of peptides and their receptors in human ever, there was a 40-fold increase in the expression of GalR2 ϭ cancers offers the possibility to develop diagnostic tools and (CT 20.1) in the transfected cells (Fig. 1C). No galanin therapeutic strategies based on the molecular targeting. expression could be detected in either cell type (data not shown). Galanin mediates its effects via at least three seven- In agreement with a previous study, the fusion protein was transmembrane, G protein-coupled receptors (GPCRs), namely detected on the surface of the cell membrane in control GalR2 GalR1, -R2, and -R3 (14–17), which have a broad distribution as cells (Fig. 1F) and internalized after galanin exposure (27), even revealed with RT-PCR (18) and in situ hybridization (19). GalR1 in cells exhibiting apoptotic condensed nuclei (Fig. 1G). is mainly expressed in central nervous system (CNS), whereas NEUROSCIENCE GalR3 is restricted to a number of brain regions and some Author contributions: R.T., Z.-Q.D.X., T.H., and S.C. designed research; R.T. performed peripheral tissues and is present at low levels. Both GalR1 and research; B.J., S.X., Z.-Q.D.X., and B.H. contributed new reagents/analytic tools; R.T., B.J., -R3 act through Gi/o receptor subtype, inhibiting adenyl cyclase, and S.C. analyzed data; and R.T., T.H., and S.C. wrote the paper. ϩ and causing hyperpolarization via opening K channels (14–17). The authors declare no conflict of interest. GalR2 has a broader distribution and is present in the CNS, §To whom correspondence may be addressed. E-mail: [email protected] or dorsal root ganglia, and many peripheral tissues (18, 19). Acti- [email protected]. vation of GalR2 leads to accumulation of inositol phosphate, This article contains supporting information online at www.pnas.org/cgi/content/full/ ϩ ϩ mobilization of intracellular Ca2 , and activation of a Ca2 - 0712300105/DC1. Ϫ dependent Cl channel via Gq/11-type G proteins. In addition, © 2008 by The National Academy of Sciences of the USA www.pnas.org͞cgi͞doi͞10.1073͞pnas.0712300105 PNAS ͉ February 19, 2008 ͉ vol. 105 ͉ no. 7 ͉ 2717–2722 Downloaded by guest on September 28, 2021 A B25 cont 48 h **** AC ) DEV Dase activity(% ofcontrol) 2000 l 500 500 )l GAL 48 h PC12 ** *** o c o n t r cont 48 h a AR-MI896 48 h GAL 48 h totf 20 GalR2 1600 400 3 400 *** o e activity(% of 1 0 **** ** % Cellnu m berx 15 (i 1200 300 300 el c ***i c n u 10 200 800 200 ** ** t * p o p t o 5 400 s 100 100 a D DEV 0 A 0 0 0 PC12 GalR2 PC12 GalR2 8h 16h 24h 30h 48h PC12 GalR2 C 60 B D **** D E 2000 30 **** )lo **** 50 P C 1 2 **** )l rt e a tot e a s 25 40 o f c o n 1600 f n c r 30 l e i ( % o 20 F o l d i F % 1200 ** G ( 20 R 2 ytivit 15 n u c l 10 a 800 G a c c i 10 0 t e o t 123 D a s cont 24 h GAL 24 h 400 o p receptor subtype 5 A p DEV Fig. 1. Increased galanin-induced cytotoxicity in GalR2-transfected cells. Expo- 0 0 sure of PC12 and GalR2-transfected cells to galanin (GAL) for 48 h reduces 1nM 10 nM 100 nM ont z-VAD GAL + D significantly the total cell number (A), whereas GAL induces a significant increase c -VAGAL in apoptotic nuclei only in GalR2-transfected cells (B). Exposure to AR-MI896 also Z increases the apoptotic nuclei only in transfected cells (B). Real-time PCR quan- tification was performed for detection of mRNA levels of GalR1, GalR2, and GalR3 Fig. 2. Caspase activity after exposure to GAL was measured with the in PC12 and GalR2-transfected cells. The amount of target gene was normalized fluorimetric DEVDase assay. Exposure of transfected GalR2 cells to 100 nM GAL to GAPDH, and the values for PC12 cells were considered as control. The relative induced a time-dependent significant increase in DEVDase activity (A). Expo- Ϫ⌬ ⌬ Ϫ⌬ increase was equal to 2 ( CTtarget CTcontrol). There was a significant increase in sure to different concentrations of GAL for 24 h caused a dose-dependent the expression level of GALR2 in the transfected cells (C). Fluorescence micro- increase (B). A significant DEVDase activity was also induced after 24 h graphs showing PC12 (D and E) and GalR2-transfected cells (F and G) after 24-h exposure to AR-MI896 only in transfected cells (C). Transfected cells were exposure to 100 nM GAL (E and G). Exposed transfected cells showed internalized preincubated with the pan-caspase inhibitor z-VAD-fmk for 30 min before GalR2 and condensed apoptotic nuclei, as shown with Hoechst dye 33358 (G).
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