Cited by 51Barrier Structure and Function StudiesNicotinic Acetylcholine Receptors StudyDrug Transport and Resistance Mechanisms

Brain uptake kinetics of nicotine and cotinine after chronic nicotine exposure

Lockman, P.R., McAfee, G., Geldenhuys, W.J., Van der Schyf, C.J., Abbruscato, T.J., Allen, D.D.·2005·The Journal of Pharmacology and Experimental Therapeutics

Abstract

Blood-brain barrier (BBB) nicotine transfer has been well documented in view of the fact that this alkaloid is a cerebral blood flow marker. However, limited data are available that describe BBB penetration of the major tobacco alkaloids after chronic nicotine exposure. This question needs to be addressed, given long-term nicotine exposure alters both BBB function and morphology. In contrast to nicotine, it has been reported that cotinine (the major nicotine metabolite) does not penetrate the BBB, yet cotinine brain distribution has been well documented after nicotine exposure. Surprisingly, therefore, the literature indirectly suggests that central nervous system cotinine distribution occurs secondarily to nicotine brain metabolism. The aims of the current report are to define BBB transfer of nicotine and cotinine in naive and nicotine-exposed animals. Using an in situ brain perfusion model, we assessed the BBB uptake of [3H]nicotine and [3H]cotinine in naive animals and in animals exposed chronically to S-(-)nicotine (4.5 mg/kg/day) through osmotic minipump infusion. Our data demonstrate that 1) [3H]nicotine BBB uptake is not altered in the in situ perfusion model after chronic nicotine exposure, 2) [3H]cotinine penetrates the BBB, and 3) similar to [3H]nicotine, [3H]cotinine BBB transfer is not altered by chronic nicotine exposure. To our knowledge, this is the first report detailing the uptake of nicotine and cotinine after chronic nicotine exposure and quantifying the rate of BBB penetration by cotinine.

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Crossref · 10.1124/jpet.105.085381

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  • The lack of effect of administered cotinine may be due to insufficient cotinine entry into the brain, with CNS levels too low for efficacy.

    “The lack of effect of administered cotinine in the current study may be caused by insufficient cotinine entry into the brain such that the CNS levels were too low for efficacy (Lockman et al., 2005).”

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Authors
Lockman, P. R., McAfee, G., Geldenhuys, W. J., Van der Schyf, C. J., Abbruscato, T. J., & Allen, D. D.
Affiliations
Texas Tech University Health Sciences Center (US)
Venue
The Journal of Pharmacology and Experimental Therapeutics
Publisher
Elsevier BV
Published
2005-08
Volume
314
Issue
2
Pages
636-642
ISSN
0022-3565 (ISSN-L)
OpenAlex
W2162830511
Cited by
51
References
43
Citations by year
2026: 2 · 2023: 2 · 2021: 3 · 2020: 1 · 2019: 1 · 2018: 2 · 2017: 2 · 2015: 4 · 2014: 2 · 2013: 5 · 2012: 4
FWCI
1.58
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Pharmacology and Experimental Therapeutics (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute of Neurological Disorders and Stroke (NS 046526, R01NS046526)
Topics
  • Life Sciences › Neuroscience › Neurology › Barrier Structure and Function Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
  • Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
Keywords
nicotine, cotinine, blood-brain barrier, chronic nicotine exposure, tobacco alkaloids, in situ brain perfusion, nicotine metabolism
MeSH terms
Animals, Aryl Hydrocarbon Hydroxylases, Blood-Brain Barrier, Brain, Cerebrovascular Circulation, Cotinine, Mixed Function Oxygenases, Nicotine, Perfusion, Rats, Inbred F344, Nicotinic Agonists, Cytochrome P-450 CYP2B1, Rats, Cytochrome P-450 CYP2A6, In Vitro Techniques

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