Biochemical Mechanism of Caffeine Tolerance
1991; Wiley; Volume: 324; Issue: 5 Linguagem: Inglês
10.1002/ardp.19913240502
ISSN1521-4184
Autores Tópico(s)Calcium signaling and nucleotide metabolism
ResumoAbstract Most of the biological actions of caffeine are possibly mediated through its antagonistic effects to adenosine. Adenosine activates an inhibitory GTP‐binding protein (G i ). One of the physiological actions of G i is the inhibition of cAMP formation. Caffeine overcomes this action thus leading to elevation of cAMP. Firing of neurons and the release of neurotransmitters is also inhibited by adenosine. Caffeine overcomes this effect, thus producing increased CNS‐activity. During long term administration of caffeine many functions of the organism develope tolerance including cardiovascular and central nervous systems. Present evidence suggests that caffeine tolerance following continuous severe coffee ingestion is the response of the body against caffeine through the upregulation of adenosine receptors.
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