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Vol. 51, Issue 1, 83-133, March 1999

Actions of Caffeine in the Brain with Special Reference to Factors That Contribute to Its Widespread Use

Bertil B. Fredholm1, Karl Bättig2, Janet Holmén, Astrid Nehlig and Edwin E. Zvartau

Section of Molecular Neuropharmacology (B.B.F., J.H.), Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden; Behavioural Biology Laboratory (K.B.), Swiss Federal Institute of Technology, Zürich, Switzerland; INSERM U 398 (A.N.), Faculté de Médecine, Strasbourg Cedex, France; Department of Psychopharmacology (E.E.Z.), Valdman Institute of Pharmacology, Pavlov Medical University, St. Petersburg, Russia

I. Introduction
II. Consumption and Metabolism of Caffeine
    A. Sources of Caffeine
    B. Caffeine Absorption, Distribution, and Pharmacokinetics
    C. Caffeine Metabolism
III. Molecular and Cellular Action of Caffeine in the Brain
    A. Fundamental Biochemical Actions
    B. Adenosine Levels in Brain and Other Tissues
    C. Adenosine Acts on Several Types of G-Protein-Coupled Receptors
        1. Receptor Subtypes.
        2. Receptor Distribution.
    D. Caffeine Affects Transmitter Release and Neuronal Firing Rates via Actions on Adenosine A1 Receptors
    E. Caffeine Effects on Dopaminergic Transmission Are Exerted Mainly via Actions on Adenosine A2A Receptors
    F. Identifying the Neuronal Substrates For Caffeine by Examining Changes in Immediate Early Genes---High Dose Effects
    G. Low Doses of Caffeine Selectively Decrease the Activity of Striatopallidal Neurons in the Striatum and Their Counterparts in the Nucleus Accumbens
IV. Actions of Caffeine on Brain Functions and Behavior
    A. Activation of Dopaminergic Transmission and Effects on Motor Behavior
    B. Caffeine and Mood
    C. Effects of Caffeine in the Cortex and Hippocampus---Information Processing and Performance
    D. Effects on Sleep
    E. Effects of Caffeine on Cerebral Blood Flow and Metabolism
    F. Other Effects
V. Addiction and Drug Dependence
    A. Definitions
    B. On the Neuronal and Molecular Basis of Drug Reinforcement and Addiction
VI. Caffeine Withdrawal and Relief of Abstinence Symptoms by Caffeine
    A. Animal Studies on Caffeine Withdrawal
    B. Human Studies
    C. Effect of Caffeine on Withdrawal Symptoms
VII. Tolerance to the Effects of Caffeine
    A. Cardiovascular Effects
    B. Effects on Sleep
    C. Effects on Mood
    D. Other Central Effects
    E. Differences between Acute and Long-Term Administration---Effect Inversion
VIII. Caffeine Discrimination and Dose Adjustment in Animals and Humans
    A. Caffeine Discrimination in Animals
    B. Caffeine Discrimination in humans
    C. Dose Adjustment
IX. Reinforcing Effects of Caffeine
    A. Reinforcement in Animals
        1. Intravenous and Oral Self-Administration.
        2. Reinforcing Effects of Caffeine: Place Conditioning.
    B. Reinforcement in Humans
X. Possible Reinforcing Effects of Coffee, Independent of Caffeine Content
XI. Comparisons with Known Addictive Compounds and Interactions between Caffeine and Addictive Drugs
    A. General Considerations
    B. Interactions between Caffeine and Cocaine or Amphetamine
    C. Interactions between Caffeine and Ethanol
    D. Interactions between Caffeine and Nicotine
XII. Possible Harmful Effects of Caffeine at the Individual or Social Level---Abuse or Misuse
XIII. Conclusions
Acknowledgments
References


1   Address for correspondence: Bertil B. Fredholm, Section of Molecular Neuropharmacology, Department of Physiology and Pharmacology, Karolinska Institutet, 171 77 Stockholm. E-mail: Bertil.Fredholm{at}fyfa.ki.se
2   Professor Karl Bättig died on 27 December 1996 and has not been able to assess the later versions of this review.


0031-6997/99/5101-0083$03.00/0
PHARMACOLOGICAL REVIEWS
Copyright © 1999 by The American Society for Pharmacology and Experimental Therapeutics



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