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Clarke MR, Jones B, Squires CLM, Imhoff FM, Harwood DT, Rhodes L, Selwood AI, McNabb PS, Baird SK. Cyclic Imine Pinnatoxin G is Cytotoxic to Cancer Cell Lines via Nicotinic Acetylcholine Receptor-Driven Classical Apoptosis. JOURNAL OF NATURAL PRODUCTS 2021; 84:2035-2042. [PMID: 34170700 DOI: 10.1021/acs.jnatprod.1c00418] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Pinnatoxin G is a cyclic imine neurotoxin produced by dinoflagellates that has been reported in shellfish. Like other members of the pinnatoxin family, it has been shown to have its effects via antagonism of the nicotinic acetylcholine receptors, with preferential binding to the α7 subunit often upregulated in cancer. Because increased activity of α7 nicotinic acetylcholine receptors contributes to increased growth and resistance to apoptosis, the effect of pinnatoxin G on cancer cell viability was tested. In a panel of six cancer cell lines, all cell types lost viability, but HT29 colon cancer and LN18 and U373 glioma cell lines were more sensitive than MDA-MB-231 breast cancer cells, PC3 prostate cancer cells, and U87 glioma cells, correlating with expression levels of α7, α4, and α9 nicotinic acetylcholine receptors. Some loss of cell viability could be attributed to cell cycle arrest, but significant levels of classical apoptosis were found, characterized by caspase activity, phosphatidylserine exposure, mitochondrial membrane permeability, and fragmented DNA. Intracellular Ca2+ levels also dropped immediately upon pinnatoxin G treatment, which may relate to antagonism of nicotinic acetylcholine receptor-mediated Ca2+ inflow. In conclusion, pinnatoxin G can decrease cancer cell viability, with both cytostatic and cytotoxic effects.
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Affiliation(s)
- Mitchell R Clarke
- Department of Pharmacology and Toxicology, School of Biomedical Sciences, University of Otago, PO Box 56, Dunedin 9016, New Zealand
| | - Ben Jones
- Department of Pharmacology and Toxicology, School of Biomedical Sciences, University of Otago, PO Box 56, Dunedin 9016, New Zealand
| | - Chloe L M Squires
- Department of Pharmacology and Toxicology, School of Biomedical Sciences, University of Otago, PO Box 56, Dunedin 9016, New Zealand
| | - Floriane M Imhoff
- Department of Pharmacology and Toxicology, School of Biomedical Sciences, University of Otago, PO Box 56, Dunedin 9016, New Zealand
| | - D Tim Harwood
- Cawthron Institute, Private Bag 2, Nelson 7040, New Zealand
| | - Lesley Rhodes
- Cawthron Institute, Private Bag 2, Nelson 7040, New Zealand
| | | | - Paul S McNabb
- Cawthron Institute, Private Bag 2, Nelson 7040, New Zealand
| | - Sarah K Baird
- Department of Pharmacology and Toxicology, School of Biomedical Sciences, University of Otago, PO Box 56, Dunedin 9016, New Zealand
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2
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Chernyavsky AI, Shchepotin IB, Galitovkiy V, Grando SA. Mechanisms of tumor-promoting activities of nicotine in lung cancer: synergistic effects of cell membrane and mitochondrial nicotinic acetylcholine receptors. BMC Cancer 2015; 15:152. [PMID: 25885699 PMCID: PMC4369089 DOI: 10.1186/s12885-015-1158-4] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Accepted: 03/04/2015] [Indexed: 12/20/2022] Open
Abstract
Background One of the major controversies of contemporary medicine is created by an increased consumption of nicotine and growing evidence of its connection to cancer, which urges elucidation of the molecular mechanisms of oncogenic effects of inhaled nicotine. Current research indicates that nicotinergic regulation of cell survival and death is more complex than originally thought, because it involves signals emanating from both cell membrane (cm)- and mitochondrial (mt)-nicotinic acetylcholine receptors (nAChRs). In this study, we elaborated on the novel concept linking cm-nAChRs to growth promotion of lung cancer cells through cooperation with the growth factor signaling, and mt-nAChRs — to inhibition of intrinsic apoptosis through prevention of opening of mitochondrial permeability transition pore (mPTP). Methods Experiments were performed with normal human lobar bronchial epithelial cells, the lung squamous cell carcinoma line SW900, and intact and NNK-transformed immortalized human bronchial cell line BEP2D. Results We demonstrated that the growth-promoting effect of nicotine mediated by activation of α7 cm-nAChR synergizes mainly with that of epidermal growth factor (EGF), α3 — vascular endothelial growth factor (VEGF), α4 — insulin-like growth factor I (IGF-I) and VEGF, whereas α9 with EGF, IGF-I and VEGF. We also established the ligand-binding abilities of mt-nAChRs and demonstrated that quantity of the mt-nAChRs coupled to inhibition of mPTP opening increases upon malignant transformation. Conclusions These results indicated that the biological sum of simultaneous activation of cm- and mt-nAChRs produces a combination of growth-promoting and anti-apoptotic signals that implement the tumor-promoting action of nicotine on lung cells. Therefore, nAChRs may be a promising molecular target to arrest lung cancer progression and re-open mitochondrial apoptotic pathways.
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Affiliation(s)
- Alex I Chernyavsky
- Department of Dermatology, University of California, 134 Sprague Hall, Irvine, CA, 92697, USA.
| | | | - Valentin Galitovkiy
- Department of Dermatology, University of California, 134 Sprague Hall, Irvine, CA, 92697, USA.
| | - Sergei A Grando
- Department of Dermatology, University of California, 134 Sprague Hall, Irvine, CA, 92697, USA. .,Department of Biological Chemistry, University of California, 134 Sprague Hall, Irvine, CA, 92697, USA. .,Cancer Center and Research Institute, University of California, 134 Sprague Hall, Irvine, CA, 92697, USA.
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3
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Abstract
This Opinion article discusses emerging evidence of direct contributions of nicotine to cancer onset and growth. The list of cancers reportedly connected to nicotine is expanding and presently includes small-cell and non-small-cell lung carcinomas, as well as head and neck, gastric, pancreatic, gallbladder, liver, colon, breast, cervical, urinary bladder and kidney cancers. The mutagenic and tumour-promoting activities of nicotine may result from its ability to damage the genome, disrupt cellular metabolic processes, and facilitate growth and spreading of transformed cells. The nicotinic acetylcholine receptors (nAChRs), which are activated by nicotine, can activate several signalling pathways that can have tumorigenic effects, and these receptors might be able to be targeted for cancer therapy or prevention. There is also growing evidence that the unique genetic makeup of an individual, such as polymorphisms in genes encoding nAChR subunits, might influence the susceptibility of that individual to the pathobiological effects of nicotine. The emerging knowledge about the carcinogenic mechanisms of nicotine action should be considered during the evaluation of regulations on nicotine product manufacturing, distribution and marketing.
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Affiliation(s)
- Sergei A Grando
- Departments of Dermatology and Biological Chemistry, and Cancer Center and Research Institute, University of California, Irvine, California 92782, USA
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4
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Kucinski A, Wersinger S, Stachowiak EK, Radell M, Hesse R, Corso T, Parry M, Bencherif M, Jordan K, Letchworth S, Stachowiak MK. Unilateral 6-OHDA <i>th-fgfr1</i>(<i>tk-</i>) mouse model supports the role of FGFs in Parkinson’s disease and the effects of nicotine and L-DOPA on spontaneous motor impairments. Health (London) 2012. [DOI: 10.4236/health.2012.431176] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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5
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Zechel S, Werner S, Unsicker K, von Bohlen und Halbach O. Expression and Functions of Fibroblast Growth Factor 2 (FGF-2) in Hippocampal Formation. Neuroscientist 2010; 16:357-73. [DOI: 10.1177/1073858410371513] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Among the 23 members of the fibroblast growth factor (FGF) family, FGF-2 is the most abundant one in the central nervous system. Its impact on neural cells has been profoundly investigated by in vitro and in vivo studies as well as by gene knockout analyses during the past 2 decades. Key functions of FGF-2 in the nervous system include roles in neurogenesis, promotion of axonal growth, differentiation in development, and maintenance and plasticity in adulthood. From a clinical perspective, its prominent role for the maintenance of lesioned neurons (e.g., ischemia and following transection of fiber tracts) is of particular relevance. In the unlesioned brain, FGF-2 is involved in synaptic plasticity and processes attributed to learning and memory. The focus of this review is on the expression of FGF-2 and its receptors in the hippocampal formation and the physiological and pathophysiological roles of FGF-2 in this region during development and adulthood.
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Affiliation(s)
- Sabrina Zechel
- Division of Molecular Neurobiology, Department of Neuroscience, Karolinska Institute, Stockholm, Sweden
| | - Sandra Werner
- Department of Molecular Embryology, Institute of Anatomy & Cell Biology, University of Freiburg, Freiburg, Germany
| | - Klaus Unsicker
- Department of Molecular Embryology, Institute of Anatomy & Cell Biology, University of Freiburg, Freiburg, Germany
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6
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Chipitsyna G, Gong Q, Anandanadesan R, Alnajar A, Batra SK, Wittel UA, Cullen DM, Akhter MP, Denhardt DT, Yeo CJ, Arafat HA. Induction of osteopontin expression by nicotine and cigarette smoke in the pancreas and pancreatic ductal adenocarcinoma cells. Int J Cancer 2009; 125:276-85. [PMID: 19358273 PMCID: PMC4465299 DOI: 10.1002/ijc.24388] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Pancreatic ductal adenocarcinoma (PDA) is a lethal disease with etiological association with cigarette smoking. Nicotine, an important component of cigarettes, exists at high concentrations in the bloodstream of smokers. Osteopontin (OPN) is a secreted phosphoprotein that confers on cancer cells a migratory phenotype and activates signaling pathways that induce cell survival, proliferation, invasion, and metastasis. Here, we investigated the potential molecular basis of nicotine's role in PDA through studying its effect on OPN. Nicotine significantly (p < 0.02) increased OPN mRNA and protein secretion in PDA cells through activation of the OPN gene promoter. The OPN mRNA induction was inhibited by the nicotinic acetylcholine receptor antagonist, mechamylamine. Further, the tyrosine kinase inhibitor genistein inhibited the nicotine-mediated induction of OPN, suggesting that mitogen activated protein kinase signaling mechanism is involved. Nicotine activated the phosphorylation of ERK1/2, but not p38 or c-Jun NH2-terminal MAP kinases. Inhibition of ERK1/2 activation reduced the nicotine-induced OPN synthesis. Rats exposed to cigarette smoke showed a dose-dependent increase in pancreatic OPN that paralleled the rise of pancreatic and plasma nicotine levels. Analysis of cancer tissue from invasive PDA patients, the majority of whom were smokers, showed the presence of significant amounts of OPN in the malignant ducts and the surrounding pancreatic acini. Our data suggest that nicotine may contribute to PDA pathogenesis through upregulation of OPN. They provide the first insight into a nicotine-initiated signal transduction pathway that regulates OPN as a possible tumorigenic mechanism in PDA.
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Affiliation(s)
- Galina Chipitsyna
- Department of Surgery, Jefferson Pancreatic, Biliary & related Cancer Center, Thomas Jefferson University, Philadelphia, PA
| | - Qiaoke Gong
- Department of Surgery, Jefferson Pancreatic, Biliary & related Cancer Center, Thomas Jefferson University, Philadelphia, PA
| | - Rathai Anandanadesan
- Department of Surgery, Jefferson Pancreatic, Biliary & related Cancer Center, Thomas Jefferson University, Philadelphia, PA
| | - Amer Alnajar
- Department of Surgery, Jefferson Pancreatic, Biliary & related Cancer Center, Thomas Jefferson University, Philadelphia, PA
| | - Surinder K. Batra
- Department of Biochemistry and Molecular Biology, Nebraska Medical Center, Omaha, NE
| | - Uwe A. Wittel
- Department of Biochemistry and Molecular Biology, Nebraska Medical Center, Omaha, NE
| | | | | | - David T. Denhardt
- Department of Cell Biology and Neuroscience, Rutgers University, New Brunswick, NJ
| | - Charles J. Yeo
- Department of Surgery, Jefferson Pancreatic, Biliary & related Cancer Center, Thomas Jefferson University, Philadelphia, PA
| | - Hwyda A. Arafat
- Department of Surgery, Jefferson Pancreatic, Biliary & related Cancer Center, Thomas Jefferson University, Philadelphia, PA
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7
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Matsumura C, Kuwashima H, Soma S, Kimura T. Effects of genistein and herbimycin, tyrosine kinase inhibitors, on catecholamine release in bovine adrenal chromaffin cells. ACTA ACUST UNITED AC 2007; 27:181-7. [PMID: 18076479 DOI: 10.1111/j.1474-8673.2007.00411.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
1 The effects of genistein and herbimycin, tyrosine kinase inhibitors, on catecholamine (CA) release were examined in bovine adrenal chromaffin cells. 2 In intact cells, genistein (10-100 microm) and herbimycin (3-30 microm) inhibited CA release induced by acetylcholine (ACh; 100 microm) or the nicotinic receptor stimulant 1,1-dimethyl-4-phenyl-piperazinium (DMPP; 10 microm), but did not affect CA release induced by high K+ (40 mm). 3 Genistein and herbimycin inhibited (45)Ca2+ uptake induced by ACh (100 microm). 4 Neither genistein nor herbimycin affected [(3)H]nicotine binding with nicotinic receptors. 5 In beta-escin-permeabilized cells, neither genistein nor herbimycin affected CA release induced by Ca2+ (1 microm). 6 These results suggest that protein tyrosine kinase plays the facilitatory role in the regulation of CA release induced by nicotinic receptor stimulation in stimulus-secretion coupling of bovine adrenal chromaffin cells.
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Affiliation(s)
- C Matsumura
- Department of Pharmacology, The Nippon Dental University School of Life Dentistry at Niigata, Hamaura-cho, Chuou-ku, Niigata 951-8580, Japan
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8
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Stachowiak MK, Maher PA, Stachowiak EK. Integrative Nuclear Signaling in Cell Development—A Role for FGF Receptor-1. DNA Cell Biol 2007; 26:811-26. [DOI: 10.1089/dna.2007.0664] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Affiliation(s)
- Michal K. Stachowiak
- Molecular and Structural Neurobiology and Gene Therapy Program, State University of New York, Buffalo, New York
| | | | - Ewa K. Stachowiak
- Molecular and Structural Neurobiology and Gene Therapy Program, State University of New York, Buffalo, New York
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9
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Mudo G, Belluardo N, Fuxe K. Nicotinic receptor agonists as neuroprotective/neurotrophic drugs. Progress in molecular mechanisms. J Neural Transm (Vienna) 2006; 114:135-47. [PMID: 16906354 DOI: 10.1007/s00702-006-0561-z] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2006] [Accepted: 07/11/2006] [Indexed: 11/29/2022]
Abstract
In the present work we reviewed recent advances concerning neuroprotective/neurotrophic effects of acute or chronic nicotine exposure, and the signalling pathways mediating these effects, including mechanisms implicated in nicotine addiction and nAChR desensitization. Experimental and clinical data largely indicate long-lasting effects of nicotine and nicotinic agonists that imply a neuroprotective/neurotrophic role of nAChR activation, involving mainly alpha7 and alpha4beta2 nAChR subtypes, as evidenced using selective nAChR agonists. Compounds interacting with neuronal nAChRs have the potential to be neuroprotective and treatment with nAChR agonists elicits long-lasting neurotrophic effects, e.g. improvement of cognitive performance in a variety of behavioural tests in rats, monkeys and humans. Nicotine addiction, which is mediated by interaction with nACh receptors, is believed to involve the modification of signalling cascades that modulate synaptic plasticity and gene expression. Desensitization, in addition to protecting cells from uncontrolled excitation, is recently considered as a form of signal plasticity. nAChR can generate these longe-lasting effects by elaboration of complex intracellular signals that mediate medium to long-term events crucial for neuronal maintenance, survival and regeneration. Although a comprehensive survey of the gene-based molecular mechanisms that underlie nicotine effects has yet not been performed a growing amount of data is beginning to improve our understanding of signalling mechanisms that lead to neurotrophic/neuroprotective responses. Evidence for an involvement of the fibroblast growth factor-2 gene in nAChR mechanisms mediating neuronal survival, trophism and plasticity has been obtained. However, more work is needed to establish the mechanisms involved in the effects of nicotinic receptor subtype activation from cognition-enhancing and neurotrophic effects to smoking behaviour and to determine more precisely the therapeutic objectives in potential nicotinic drug treatments of neurodegenerative diseases.
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Affiliation(s)
- G Mudo
- Department of Experimental Medicine, Section of Human Physiology, University of Palermo, Palermo, Italy.
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10
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Dunham-Ems SM, Pudavar HE, Myers JM, Maher PA, Prasad PN, Stachowiak MK. Factors controlling fibroblast growth factor receptor-1's cytoplasmic trafficking and its regulation as revealed by FRAP analysis. Mol Biol Cell 2006; 17:2223-35. [PMID: 16481405 PMCID: PMC1446089 DOI: 10.1091/mbc.e05-08-0749] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Biochemical and microscopic studies have indicated that FGFR1 is a transmembrane and soluble protein present in the cytosol and nucleus. How FGFR1 enters the cytosol and subsequently the nucleus to control cell development and associated gene activities has become a compelling question. Analyses of protein synthesis, cytoplasmic subcompartmental distribution and movement of FGFR1-EGFP and FGFR1 mutants showed that FGFR1 exists as three separate populations (a) a newly synthesized, highly mobile, nonglycosylated, cytosolic receptor that is depleted by brefeldin A and resides outside the ER-Golgi lumen, (b) a slowly diffusing membrane receptor population, and (c) an immobile membrane pool increased by brefeldin A. RSK1 increases the highly mobile cytosolic FGFR1 population and its overall diffusion rate leading to increased FGFR1 nuclear accumulation, which coaccumulates with RSK1. A model is proposed in which newly synthesized FGFR1 can enter the (a) "nuclear pathway," where the nonglycosylated receptor is extruded from the pre-Golgi producing highly mobile cytosolic receptor molecules that rapidly accumulate in the nucleus or (b) "membrane pathway," in which FGFR1 is processed through the Golgi, where its movement is spatially restricted to trans-Golgi membranes with limited lateral mobility. Entrance into the nuclear pathway is favored by FGFR1's interaction with kinase active RSK1.
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MESH Headings
- Animals
- Brefeldin A/pharmacology
- Cattle
- Cell Nucleus/chemistry
- Cell Nucleus/metabolism
- Cells, Cultured
- Cytoplasm/metabolism
- Fluorescence Recovery After Photobleaching
- Golgi Apparatus/metabolism
- Green Fluorescent Proteins/analysis
- Green Fluorescent Proteins/genetics
- Humans
- Models, Biological
- Protein Biosynthesis
- Protein Transport/drug effects
- Receptor, Fibroblast Growth Factor, Type 1/analysis
- Receptor, Fibroblast Growth Factor, Type 1/genetics
- Receptor, Fibroblast Growth Factor, Type 1/metabolism
- Recombinant Fusion Proteins/analysis
- Recombinant Fusion Proteins/genetics
- Recombinant Fusion Proteins/metabolism
- Ribosomal Protein S6 Kinases, 90-kDa/analysis
- Ribosomal Protein S6 Kinases, 90-kDa/metabolism
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Affiliation(s)
- Star M Dunham-Ems
- Molecular and Structural Neurobiology and Gene Therapy Program, Department of Pathology and Anatomical Sciences, State University of New York at Buffalo, Buffalo, NY 14214, USA
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11
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Belluardo N, Olsson PA, Mudo' G, Sommer WH, Amato G, Fuxe K. Transcription factor gene expression profiling after acute intermittent nicotine treatment in the rat cerebral cortex. Neuroscience 2005; 133:787-96. [PMID: 15890456 DOI: 10.1016/j.neuroscience.2005.01.061] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2004] [Revised: 12/22/2004] [Accepted: 01/26/2005] [Indexed: 10/25/2022]
Abstract
Several studies in different in vitro and in vivo models have demonstrated neuroprotective effects of nicotinic receptor agonists and indirect trophic actions of nicotine on brain are suggested from observations describing nicotine as a cognitive enhancer by increasing vigilance and improving learning and memory. While an increasing number of studies have given evidence of neuroprotective and neurotrophic effects of nicotine treatment, the molecular mechanism mediating the neurotrophic effects of nicotine are not fully understood. Previously in an analysis of several neurotrophic factors as possible mediators of nicotine-induced neuroprotection and/or neurotrophic effects we could reveal that an acute intermittent nicotine treatment increases fibroblast growth factor-2 mRNA and protein in several brain regions of rat brain. Even if other studies have demonstrated in different paradigms that nicotine administration modulates expression level of a variety of genes, there is still a lack of indication which candidate genes, involved in neuroprotective responses are modulated by nicotine. In the present work we have used a microarray assay to further find and characterize new genes responsive to acute intermittent nicotine treatment and linked to neuroprotection. Therefore, we used Rat Genome U34A Affymetrix GeneChip arrays containing about 8800 probe sets to characterize transcriptional responses in the rat parietal cortex after acute intermittent nicotine treatment. We focused our attention to expression of transcription factors and several of them were up- or down-regulated by nicotine, among these Nr4a1 (Nurr77), Egr-1 and Egr-2. In situ hybridization was used to corroborate the microarray data and to reveal further spatial and temporal patterns of these nicotine induced genes. Taken together the present results identified several novel candidate genes modified by acute intermittent nicotine exposure and as such potentially involved in neuroprotective-neurotrophic actions.
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Affiliation(s)
- N Belluardo
- Department of Experimental Medicine, Division of Human Physiology, University of Palermo, Corso Tukory 129, 90134 Palermo, Italy.
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12
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Conklin BS, Zhao W, Zhong DS, Chen C. Nicotine and cotinine up-regulate vascular endothelial growth factor expression in endothelial cells. THE AMERICAN JOURNAL OF PATHOLOGY 2002; 160:413-8. [PMID: 11839560 PMCID: PMC1850669 DOI: 10.1016/s0002-9440(10)64859-6] [Citation(s) in RCA: 124] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Cigarette smoking is an important risk factor for both vascular disease and various forms of cancer. Vascular endothelial growth factor (VEGF) is an endothelial-specific mitogen that is normally expressed only in low levels in normal arteries but may be involved in the progression of both vascular disease and cancer. Some clinical evidence suggests that cigarette smoking may increase plasma VEGF levels, but there is a lack of basic science studies investigating this possibility. We show here, using an intact porcine common carotid artery perfusion culture model, that nicotine and cotinine, the major product of nicotine metabolism, cause a significant increase in endothelial cell VEGF expression. VEGF mRNA levels were compared between groups using reverse transcriptase-polymerase chain reaction, whereas protein level changes were demonstrated with Western blotting and immunohistochemistry. Our results showed significant increases in endothelial cell VEGF mRNA and protein levels because of nicotine and cotinine at concentrations representative of plasma concentrations seen in habitual smokers. VEGF immunostaining also paralleled these results. These findings may give a clue as to the mechanisms by which nicotine and cotinine from cigarette smoking increase vascular disease progression and tumor growth and metastasis.
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Affiliation(s)
- Brian S Conklin
- Department of Surgery, Emory University School of Medicine, Atlanta, GA 30322, USA
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13
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Belluardo N, Mudò G, Blum M, Fuxe K. Central nicotinic receptors, neurotrophic factors and neuroprotection. Behav Brain Res 2000; 113:21-34. [PMID: 10942029 DOI: 10.1016/s0166-4328(00)00197-2] [Citation(s) in RCA: 146] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The multiple combinations of nAChR subunits identified in central nervous structures possess distinct pharmacological and physiological properties. A growing number of data have shown that compounds interacting with neuronal nAChRs have, both in vivo and in vitro, the potential to be neuroprotective and that treatment with nAChR agonists elicit long-lasting improving of cognitive performance in a variety of behavioural tests in rats, monkeys and humans. Epidemiological and clinical studies suggested also a potential neuroprotective/trophic role of (-)-nicotine in neurodegenerative disease, such as Alzheimer's and Parkinson's disease. Taken together experimental and clinical data largely indicate a neuroprotective/trophic role of nAChR activation involving mainly alpha7 and alpha4beta2 nAChR subtypes, as evidenced using selective nAChR antagonists, and by potent nAChR agonists recently found displaying efficacy and/or larger selective affinities than (-)-nicotine for neuronal nAChR subtypes. A neurotrophic factor gene regulation by nAChR signalling has been taken into consideration as possible mechanism involved in neuroprotective/trophic effects by nAChR activation and has evidenced an involvement of the fibroblast growth factor (FGF-2) gene as a target of nAChR signalling. These findings suggested that FGF-2 could be involved, according to the FGF-2 neurotrophic functions, in nAChR mechanisms mediating the neuronal survival, trophism and plasticity.
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Affiliation(s)
- N Belluardo
- Institute of Human Physiology, University of Palermo, Italy.
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14
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Belluardo N, Mudo G, Blum M, Amato G, Fuxe K. Neurotrophic effects of central nicotinic receptor activation. JOURNAL OF NEURAL TRANSMISSION. SUPPLEMENTUM 2000:227-45. [PMID: 11205143 DOI: 10.1007/978-3-7091-6301-6_15] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/16/2023]
Abstract
A growing number of data have shown that compounds interacting with neuronal nicotinic acetylcholine receptors (nAChRs) have, both in vivo and in vitro, the potential to be neuroprotective and that treatment with nAChR agonists elicit long-lasting improvement of cognitive performance in a variety of behavioural tests in rats, monkeys and humans. Epidemiological and clinical studies suggested also a potential neuroprotective/trophic role of (-)-nicotine in neurodegenerative disease, such as Alzheimer's disease and Parkinson's disease. This neuroprotective/trophic role of nAChR activation has been mainly mediated by alpha7 and alpha4beta2 nAChR subtypes, as evidenced using selective nAChR antagonists, and by potent nAChR agonists recently found displaying efficacy and/or larger selective affinities than (-)-nicotine for neuronal nAChR subtypes. A neurotrophic factor gene regulation by nAChR signalling has been taken into consideration as a possible mechanism involved in neuroprotective/trophic effects of nAChR activation and has given evidence that the fibroblast growth factor (FGF-2) gene is a target for nAChR signalling. These findings suggested that FGF-2 could be involved, in view of its neurotrophic functions, in nAChR mechanisms mediating neuronal survival, trophism and plasticity.
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Affiliation(s)
- N Belluardo
- Institute of Human Physiology, University of Palermo, Italy.
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15
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Hughes JD, Jacobs DH, Heilman KM. Neuropharmacology and linguistic neuroplasticity. BRAIN AND LANGUAGE 2000; 71:96-101. [PMID: 10716818 DOI: 10.1006/brln.1999.2223] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Affiliation(s)
- J D Hughes
- Department of Neurology, Uniformed Services University of the Health Sciences, Bethesda, Maryland 20814, USA.
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16
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Belluardo N, Mudò G, Caniglia G, Cheng Q, Blum M, Fuxe K. The nicotinic acetylcholine receptor agonist ABT-594 increases FGF-2 expression in various rat brain regions. Neuroreport 1999; 10:3909-13. [PMID: 10716232 DOI: 10.1097/00001756-199912160-00034] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The present experiments were designed to extend previous work showing that acute intermittent (-)nicotine treatment upregulates the level of fibroblast growth factor-2 (FGF2) mRNA in several rat brain regions, by the use of the nicotinic acetylcholine receptor (nAChR) agonist ABT-594 with preferential selectivity for the alpha4beta2 nAChR subtype. ABT594 treatment led to a well-defined temporal and regional upregulation of FGF-2 mRNA. A double labelling analysis showed that the up-regulation of FGF-2 mRNA involves both neuronal and non-neuronal cells. The effects of ABT-594 on FGF-2 expression were antagonized by the preferential alpha4beta2 antagonist dihydrobetaerythroidine (DHbetaE), but not by alpha7 antagonist methyllycaconitine (MLA). In conclusion, FGF-2 mRNA levels can be increased in several brain regions upon alpha4beta2 nAChR activation, suggesting a therapeutic significance in neurodegenerative disorders.
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Affiliation(s)
- N Belluardo
- Institute of Human Physiology, University of Palermo, Italy
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Blottner D. Nitric oxide and target-organ control in the autonomic nervous system: Anatomical distribution, spatiotemporal signaling, and neuroeffector maintenance. J Neurosci Res 1999. [DOI: 10.1002/(sici)1097-4547(19991001)58:1<139::aid-jnr14>3.0.co;2-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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