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    Eur J Pharmacol. 2007 Jan 26;555(2-3):174-7. Epub 2006 Oct 25.

    Adenosine A1 receptors determine effects of caffeine on total fluid intake but not caffeine appetite.

    Rieg T, Schnermann J, Vallon V.

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    Department of Medicine, University of California San Diego & VA San Diego Healthcare System, 3350 La Jolla Village Drive (9151), San Diego, CA 92161, USA.

    Abstract

    Adenosine A1 receptor wild-type (+/+) and knockout (-/-) mice were used to elucidate the role of adenosine A1 receptors in caffeine self-administration in a two-bottle choice test and in the effect of caffeine on total fluid intake and plasma renin concentration. With access to water only, adenosine A1 receptor -/- mice showed greater basal fluid intake and greater plasma renin concentration than +/+ mice. Free access to both water and a caffeinated solution (30 mg/100 ml) for 14 days increased total fluid intake only in adenosine A1 receptor +/+ mice (by 23+/-3%), and both total fluid intake and plasma renin concentration were no longer different between genotypes. Mean intake of water and caffeinated solution was not different between adenosine A1 receptor +/+ and -/- mice. These data reveal that adenosine A1 receptors do not contribute to caffeine consumption, but determine the effects of caffeine on fluid intake and plasma renin concentration.

    PMID:
    17126319
    [PubMed - indexed for MEDLINE]

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