1
|
Nicotine stimulates transcriptional activity of the human dopamine transporter gene. Neurosci Lett 2010; 471:34-7. [DOI: 10.1016/j.neulet.2010.01.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2009] [Revised: 12/02/2009] [Accepted: 01/05/2010] [Indexed: 11/19/2022]
|
2
|
Castelán F, Castillo M, Mulet J, Sala S, Sala F, Domínguez del Toro E, Criado M. Molecular characterization and localization of the RIC-3 protein, an effector of nicotinic acetylcholine receptor expression. J Neurochem 2008; 105:617-27. [DOI: 10.1111/j.1471-4159.2007.05169.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
3
|
Lenzken SC, Lanni C, Govoni S, Lucchelli A, Schettini G, Racchi M. Nicotinic component of galantamine in the regulation of amyloid precursor protein processing. Chem Biol Interact 2006; 165:138-45. [PMID: 17196952 DOI: 10.1016/j.cbi.2006.11.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2006] [Revised: 11/23/2006] [Accepted: 11/24/2006] [Indexed: 12/30/2022]
Abstract
Current therapies for Alzheimer's disease treatment rely mainly on acetylcholinesterase inhibitors, improving central cholinergic neurotransmission. Among these molecules, galantamine (GAL) has an interesting pharmacological profile as it is both a reversible acetylcholinesterase inhibitor and an allosteric potentiator of nicotinic cholinergic receptors. We investigated the effect of GAL on the metabolism of the amyloid precursor protein (APP) in differentiated SH-SY5Y neuroblastoma cells. The rationale was based on the suggestion that cholinergic activity may also be involved in the regulation of APP metabolism. We studied the acute effect on APP metabolism measuring the secretion of sAPPalpha in the conditioned medium of cells. Following 2h treatment, GAL 10microM promoted a strong increase in the release of sAPPalpha, the maximal effect approaching on average three-fold baseline value. The compound appeared to increase the release of sAPPalpha, with a mechanism dependent upon an indirect cholinergic stimulation. The effect of GAL was prevented by pre-treatment with alpha-bungarotoxin (40nM) but not low (nanomolar) atropine concentrations, suggesting the specific involvement of nicotinic cholinergic receptors.
Collapse
Affiliation(s)
- Silvia C Lenzken
- Department of Experimental and Applied Pharmacology, Centre of Excellence in Applied Biology, University of Pavia, Viale Taramelli 14, CAP 27100 Pavia, Italy
| | | | | | | | | | | |
Collapse
|
4
|
Serres F, Carney SL. Nicotine regulates SH-SY5Y neuroblastoma cell proliferation through the release of brain-derived neurotrophic factor. Brain Res 2006; 1101:36-42. [PMID: 16790237 DOI: 10.1016/j.brainres.2006.05.023] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2005] [Revised: 05/02/2006] [Accepted: 05/08/2006] [Indexed: 11/25/2022]
Abstract
Nicotine has been shown to produce some beneficial effects in neurodegenerative disorders, and several studies have suggested that these effects may be mediated in part through the action of the neurotrophic factor BDNF. To further elucidate the interaction between nicotine and BDNF, we examined the effect of nicotine on the proliferation of the neuroblastoma cell line SH-SY5Y, which, following differentiation with retinoic acid, expresses both nicotinic receptors and the receptor for BDNF, TrkB. Both nicotine and the nicotinic alpha-7 selective agonist AR-17779 significantly increased cell proliferation albeit with bell-shaped dose-response kinetics. The blockade of this effect with either the alpha-7 nicotinic antagonist methyllycaconitine or the non-selective nicotinic antagonist mecamylamine indicated that the effect was mediated by nicotinic receptors. Prior addition of neutralising BDNF antibodies or of the tyrosine kinase inhibitor K252A (200 nM) completely blocked nicotine-induced proliferation, suggesting the involvement of TrkB signalling in the mediation of the effect. Nicotine also enhanced both the secretion of BDNF from the SH-SY5Y and cell surface density of TrkB receptors. These effects were abolished by pretreatment with MLA. These data indicate that activation of nicotinic receptors has effects upon the BDNF-TrkB pathway, inducing cell proliferation by promoting the release of BDNF, which in turn activates TrkB receptors.
Collapse
Affiliation(s)
- Florence Serres
- University Department of Pharmacology Oxford University Mansfield Road, Oxford OX1 3QT, UK.
| | | |
Collapse
|
5
|
Mangoura D, Theofilopoulos S, Karouzaki S, Tsirimonaki E. 12-O-tetradecanoyl-phorbol-13-acetate-dependent up-regulation of dopaminergic gene expression requires Ras and neurofibromin in human IMR-32 neuroblastoma. J Neurochem 2006; 97 Suppl 1:97-103. [PMID: 16635257 DOI: 10.1111/j.1471-4159.2005.03483.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The dopaminergic transcriptional programme is highly regulated during development and in the adult, in response to activation of membrane receptor signalling cascades. Gene expression of tyrosine hydroxylase (TH), the rate-limiting enzyme in dopamine synthesis, is known to be regulated by receptors that act through protein kinase C (PKC) or Ras signalling. To investigate possible interactions between these two pathways before they converge on Raf activation, we evaluated whether phorbol ester (12-O-tetradecanoyl-phorbol-13-acetate, TPA)-dependent PKC activation required Ras for regulation of TH expression in IMR-32 cells. We found that long-term treatment with TPA, which induces down-regulation of PKC-alpha, led to induction of both protein and message levels of TH by autocrine factors. This was dependent on endogenous Ras, but independent of the transcription factor Nurr1. Moreover, this mechanism of action mimicked the effects of overexpression of the Ras-GAP domain of neurofibromin, GAP-related domain (GRD) I, which is part of the upstream mechanism for regulation of Ras activation and a PKC-alpha substrate. Overexpression of Ras also led to transcriptional and translational up-regulation of TH, independent of Nurr1 induction, as well as distinct phenotypic changes consistent with cell hypertrophy and increased secretory activity shown by induction of expression of vesicular monoamine transporter 2 and synaptosomal-associated protein-25. Most interestingly, overexpression of GRDI and down-regulation of the endogenous GRDII neurofibromin led to significant increases in Nurr1 message, possibly reflecting a transcriptional hierarchy during development. Taken together, these studies suggest that PKC-alpha, neurofibromin and Ras are essential in regulation of TH gene expression in IMR-32 cells.
Collapse
Affiliation(s)
- Dimitra Mangoura
- Neurosciences Division, Foundation for Biomedical Research of the Academy of Athens (IIBEAA), Athens, Greece.
| | | | | | | |
Collapse
|
6
|
Kaur N, Wohlhueter AL, Halvorsen SW. Activation and inactivation of signal transducers and activators of transcription by ciliary neurotrophic factor in neuroblastoma cells. Cell Signal 2002; 14:419-29. [PMID: 11882386 DOI: 10.1016/s0898-6568(01)00280-7] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Neurons in vivo are exposed to a variety of different growth factors and cytokines. A principal signalling pathway for ciliary neurotrophic factor (CNTF)-like cytokines is the Janus kinase (Jak)/signal transducer and activator of transcription (STAT) system of kinases and transcription factors. In the human cell line (SH-SY5Y), STAT1 and STAT3 activation by CNTF-like cytokines showed tyrosine phosphorylation peaking at 0.5 h and inactivating within 2 h. Tyrosine phosphorylation of the receptor-associated tyrosine kinases Jak1 and Jak2 showed a similar time course of activation and inactivation in response to CNTF. The STAT1 response to the non-CNTF-like cytokine, interferon-gamma (IFN-gamma) did not inactivate. Inactivation to CNTF was not due to a decrease in CNTF receptor subunit gp130 or in levels of Jak1 or Jak2. STAT inactivation was inhibited by the protein kinase blocker H7 and a tyrosine phosphatase blocker, but not by inhibitors of protein kinase C, mitogen-activated protein kinase (MAPK) kinase, mTOR-P70/S6 kinase or phosphatidyl inositol-3-kinase (PI-3 kinase). Surprisingly, CNTF caused only a minor increase in levels of suppressors of cytokine signalling, SOCS-1 and SOCS-3. CNTF pretreatment desensitized the cells to the CNTF-like cytokines, leukemia inhibitory factor and oncostatin-M but not to IFN-gamma. These results reveal a complex level of regulation of shared signalling pathways for cytokines that is dependent on both the type of cell and cytokine.
Collapse
Affiliation(s)
- Navjot Kaur
- Department of Pharmacology and Toxicology, School of Medicine and Biomedical Sciences, 102 Faber Hall, University at Buffalo, The State University of New York, Buffalo, NY 14214-3000, USA
| | | | | |
Collapse
|
7
|
Dineley KT, Patrick JW. Amino acid determinants of alpha 7 nicotinic acetylcholine receptor surface expression. J Biol Chem 2000; 275:13974-85. [PMID: 10788524 DOI: 10.1074/jbc.275.18.13974] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Transient transfection has not been a successful method to express the alpha7 nicotinic acetylcholine receptor such that these receptors are detected on the cell surface. This is not the case for all ligand-gated ion channels. Transient transfection with the 5-hydroxytryptamine type 3 subunit cDNA results in detectable surface receptor expression. Cell lines stably expressing the alpha7 nicotinic acetylcholine receptor produce detectable, albeit variable, levels of surface receptor expression. alpha7 nicotinic acetylcholine receptor surface expression is dependent, at least in part, on cell-specific factors. In addition to factors provided by the cells used for receptor expression, we hypothesize that the surface expression level in transfected cells is an intrinsic property of the receptor protein under study. Employing a set of alpha7-5-hydroxytryptamine type 3 chimeric receptor subunit cDNAs, we expressed these constructs in a transient transfection system and quantified surface receptor expression. We have identified amino acids that control receptor distribution between surface and intracellular pools; surface receptor expression can be manipulated without affecting the total number of receptors. These determinants function independently of the cell line used for expression and the transfection method employed. How these surface expression determinants in the alpha7 nicotinic acetylcholine receptor might influence synaptic efficacy is discussed.
Collapse
Affiliation(s)
- K T Dineley
- Division of Neuroscience, Baylor College of Medicine, Houston, Texas 77030, USA.
| | | |
Collapse
|
8
|
Wang X, Halvorsen SW. Retinoic acid up-regulates ciliary neurotrophic factor receptors in cultured chick neurons and cardiomyocytes. Neurosci Lett 1998; 240:9-12. [PMID: 9488162 DOI: 10.1016/s0304-3940(97)00927-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Retinoic acid is an important developmental factor in the heart and nervous system and regulates the expression of trophic factor receptors in neural cell lines. Here we show the effects of retinoic acid on cytokine responsiveness in embryonic chick neurons and myocytes. Treatment of cultured cardiomyocytes and retinal and ciliary ganglion neurons with retinoic acid resulted in increased expression of receptors for the neuropoietic cytokine, CNTF. All-trans-retinoic acid induced as much as a 3-fold increase in CNTF receptor alpha subunit mRNA in a time and concentration dependent manner and resulted in an enhanced CNTF-induced tyrosine phosphorylation of the transcription factor, STAT3. These results indicate that neurons and myocytes expressing CNTF receptors are responsive to retinoic acid and suggest that retinoids may regulate cell sensitivity to cytokines during development.
Collapse
Affiliation(s)
- X Wang
- Department of Biochemical Pharmacology, SUNY at Buffalo 14260-1200, USA
| | | |
Collapse
|
9
|
Abstract
Nicotine is a very widely used drug of abuse, which exerts a number of neurovegetative, behavioural and psychological effects by interacting with neuronal nicotinic acetylcholine receptors (NAChRs). These receptors are distributed widely in human brain and ganglia, and form a family of ACh-gated ion channels of different subtypes, each of which has a specific pharmacology and physiology. As human NAChRs have been implicated in a number of human central nervous system disorders (including the neurodegenerative Alzheimer's disease, schizophrenia and epilepsy), they are suitable potential targets for rational drug therapy. Much of our current knowledge about the structure and function of NAChRs comes from studies carried out in other species, such as rodents and chicks, and information concerning human nicotinic receptors is still incomplete and scattered in the literature. Nevertheless, it is already evident that there are a number of differences in the anatomical distribution, physiology, pharmacology, and expression regulation of certain subtypes between the nicotinic systems of humans and other species. This review will attempt to survey the major achievements reached in the study of the structure and function of NAChRs by examining the molecular basis of their functional diversity viewed mainly from pharmacological and biochemical perspectives. It will also summarize our current knowledge concerning the structure and function of the NAChRs expressed by other species, and the newly discovered drugs used to classify their numerous subtypes. Finally, the role of NAChRs in behaviour and pathology will be considered.
Collapse
Affiliation(s)
- C Gotti
- Department of Medical Pharmacology, University of Milan, Italy
| | | | | |
Collapse
|
10
|
Gopalakrishnan M, Molinari EJ, Sullivan JP. Regulation of Human α4β2 Neuronal Nicotinic Acetylcholine Receptors by Cholinergic Channel Ligands and Second Messenger Pathways. Mol Pharmacol 1997. [DOI: 10.1124/mol.52.3.524] [Citation(s) in RCA: 101] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
|
11
|
Malek RL, Halvorsen SW. Opposing regulation of ciliary neurotrophic factor receptors on neuroblastoma cells by distinct differentiating agents. ACTA ACUST UNITED AC 1997. [DOI: 10.1002/(sici)1097-4695(199701)32:1<81::aid-neu8>3.0.co;2-a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
|
12
|
Halvorsen SW, Malek R, Wang X, Jiang N. Ciliary neurotrophic factor regulates nicotinic acetylcholine receptors on human neuroblastoma cells. Neuropharmacology 1996; 35:257-65. [PMID: 8783199 DOI: 10.1016/0028-3908(95)00168-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
We have investigated the effects of several neurokine/cytokine family members on the level of alpha-bungarotoxin-binding to neuronal nicotinic acetylcholine receptors. Exposure of human neuroblastoma cells (SH-SY5Y and IMR-32) to ciliary neurotrophic factor (CNTF), leukemia inhibitory factor or oncostatin-M resulted in a 30-40% decline in alpha-bungarotoxin receptors on the cells with no decrease seen in either muscarinic acetylcholine receptors or in L-type Ca2+ channels. The level of nicotinic receptor was not affected by the related cytokine, interleukin-6. Treatment of IMR-32 cells with 40 pM CNTF produced a half-maximal decrease of alpha-bungarotoxin binding which compared well with the affinity estimated from binding of 125I-CNTF (Ki approximately 40 pM) and the concentration causing c-fos activation in SH-SY5Y cells, as detected by nuclear run-on assays (60-120 pM). Previous results have indicated that the differentiating agents, phorbol esters and retinoic acid, also decrease nicotinic receptor numbers. Here the effects of CNTF, which did not induce neural differentiation, were enhanced by differentiation with 12-O-tetradecanoylphorbol 13-acetate (10 nM) and prevented by retinoic acid (10 microM). Therefore, the response of neuroblastoma cells to cytokines may be under developmental control. These cells offer a system to examine cytokine responses and signal transduction mechanisms during neural development.
Collapse
Affiliation(s)
- S W Halvorsen
- Department of Biochemical Pharmacology, School of Pharmacy, State University of New York at Buffalo, NY 14260, USA
| | | | | | | |
Collapse
|