Cited by 76Nicotinic Acetylcholine Receptors StudyCellular transport and secretionNeuroscience and Neuropharmacology Research

Exocytic trafficking is required for nicotine-induced up-regulation of α4β2 nicotinic acetylcholine receptors

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Darsow, Tamara, Booker, T.K., Piña-Crespo, Juan Carlos, Heinemann, Stephen F.·2005·Journal of Biological Chemistry

Abstract

The primary target for nicotine in the brain is the neuronal nicotinic acetylcholine receptor (nAChR). It has been well documented that nAChRs respond to chronic nicotine exposure by up-regulation of receptor numbers, which may underlie some aspects of nicotine addiction. In order to investigate the mechanism of nicotine-induced nAChR up-regulation, we have developed a cell culture system to assess membrane trafficking and nicotine-induced up-regulation of surface-expressed α4β2 nAChRs. Previous reports have implicated stabilization of the nAChRs at the plasma membrane as the potential mechanism of up-regulation. We have found that whereas nicotine exposure results in up-regulation of surface receptors in our system, it does not alter surface receptor internalization from the plasma membrane, postendocytic trafficking, or lysosomal degradation. Instead, we find that transport of nAChRs through the secretory pathway to the plasma membrane is required for nicotine-induced up-regulation of surface receptors. Therefore, nicotine appears to regulate surface receptor levels at a step prior to initial insertion in the plasma membrane rather than by altering their endocytic trafficking or degradation rates as had been previously suggested. The primary target for nicotine in the brain is the neuronal nicotinic acetylcholine receptor (nAChR). It has been well documented that nAChRs respond to chronic nicotine exposure by up-regulation of receptor numbers, which may underlie some aspects of nicotine addiction. In order to investigate the mechanism of nicotine-induced nAChR up-regulation, we have developed a cell culture system to assess membrane trafficking and nicotine-induced up-regulation of surface-expressed α4β2 nAChRs. Previous reports have implicated stabilization of the nAChRs at the plasma membrane as the potential mechanism of up-regulation. We have found that whereas nicotine exposure results in up-regulation of surface receptors in our system, it does not alter surface receptor internalization from the plasma membrane, postendocytic trafficking, or lysosomal degradation. Instead, we find that transport of nAChRs through the secretory pathway to the plasma membrane is required for nicotine-induced up-regulation of surface receptors. Therefore, nicotine appears to regulate surface receptor levels at a step prior to initial insertion in the plasma membrane rather than by altering their endocytic trafficking or degradation rates as had been previously suggested. Neuronal nicotinic acetylcholine receptors (nAChRs) 1The abbreviations used are: nAChR, nicotinic acetylcholine receptor; PBS, phosphate-buffered saline; mAb, monoclonal antibody; FACS, fluorescence-activated cell sorting; BFA, brefeldin A; ER, endoplasmic reticulum; HA, hemagglutinin. in mammalian brain compose a family of proteins encoded by 11 genes (α2-7, α9-10, and β2-4) that assemble into pentameric ligand-gated ion channels (1Dani J.A. Biol. Psychiatry. 2001; 49: 166-174Abstract Full Text Full Text PDF PubMed Scopus (352) Google Scholar, 2Elgoyhen A.B. Vetter D.E. Katz E. Rothlin C.V. Heinemann S.F. Boulter J. Proc. Natl. Acad. Sci. U. S. A. 2001; 98: 3501-3506Crossref PubMed Scopus (564) Google Scholar, 3Lindstrom J. North R.A. Handbook of Receptors and Channels. CRC Press, Inc., Boca Raton, FL1995: 153-175Google Scholar, 4McGehee D.S. Role L.W. Annu. Rev. Physiol. 1995; 57: 521-546Crossref PubMed Scopus (898) Google Scholar). Although all combinations of subunits that form functional nicotinic receptors can bind nicotine, α4- and β2-containing receptors form the high affinity nicotine binding site (5Picciotto M.R. Zoli M. Lena C. Bessis A. Lallemand Y. Le Novere N. Vincent P. Pich E.M. Brulet P. Changeux J.P. Nature. 1995; 374: 65-67Crossref PubMed Scopus (563) Google Scholar, 6Ross S.A. Wong J.Y. Clifford J.J. Kinsella A. Massalas J.S. Horne M.K. Scheffer I.E. Kola I. Waddington J.L. Berkovic S.F. Drago J. J. Neurosci. 2000; 20: 6431-6441Crossref PubMed Google Scholar, 7Whiting P.J. Liu R. Morley B.J. Lindstrom J.M. J. Neurosci. 1987; 7: 4005-4016Crossref PubMed Google Scholar, 8Flores C.M. Rogers S.W. Pabreza L.A. Wolfe B.B. Kellar K.J. Mol. Pharmacol. 1992; 41: 31-37PubMed Google Scholar, 9Marubio L.M. del Mar Arroyo-Jimenez M. Cordero-Erausquin M. Lena C. Le Novere N. de Kerchove d'Exaerde A. Huchet M. Damaj M.I. Changeux J.P. Nature. 1999; 398: 805-810Crossref PubMed Scopus (511) Google Scholar) and are therefore thought to be the primary nAChR subtype affected by the relatively low nicotine concentrations (100-500 nm) found in the blood of smokers (10Benowitz N.L. Kuyt F. Jacob P.I. Clin. Pharmacol. Ther. 1982; 32: 758-764Crossref PubMed Scopus (256) Google Scholar). Chronic exposure of α4β2 receptors to nicotine, as occurs in smokers, results initially in receptor desensitization, followed by subsequent up-regulation of high affinity nicotine binding sites (11Schwartz R.D. Kellar K.J. Science. 1983; 220: 214-216Crossref PubMed Scopus (4

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Authors
Darsow, T., Booker, T. K., Piña-Crespo, J. C., & Heinemann, S. F.
Affiliations
Salk Institute for Biological Studies (US)
Corresponding author
Darsow, Tamara
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2005-05
Volume
280
Issue
18
Pages
18311-18320
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1987632317
Cited by
76
References
44
Citations by year
2024: 1 · 2023: 1 · 2021: 1 · 2020: 1 · 2018: 1 · 2017: 3 · 2016: 3 · 2015: 5 · 2014: 5 · 2013: 7 · 2012: 6
FWCI
2.76
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
National Institute on Alcohol Abuse and Alcoholism (AA13018, R01AA013018)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
α4β2 nicotinic acetylcholine receptor, receptor up-regulation, secretory pathway, membrane trafficking, receptor internalization, lysosomal degradation, nicotine dependence, receptor surface expression
MeSH terms
Animals, Cell Line, Exocytosis, Humans, Nicotine, Receptors, Nicotinic, Up-Regulation, Protein Transport, Mice

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