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Inhibition of epidermal growth factor-induced cell transformation and Akt activation by caffeine

✍ Scribed by Masaaki Nomura; Daisuke Ichimatsu; Shuzo Moritani; Ichiko Koyama; Zigang Dong; Koichi Yokogawa; Ken-ichi Miyamoto

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
296 KB
Volume
44
Category
Article
ISSN
0899-1987

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✦ Synopsis

Abstract

We found that caffeine significantly inhibited epidermal growth factor (EGF)‐ and 12‐O‐tetradecanoylphorbol‐13‐acetate (TPA)‐induced cell transformation in the JB6 mouse epidermal cell line. The tumor promoter‐induced cell transformation was also blocked by treatment with an adenosine A1 receptor antagonist, 8‐phenyltheophylline (8‐PTH). Caffeine slightly attenuated activation of EGF‐induced activator protein 1 (AP‐1) activation, which play important roles in cell transformation, but only at the highest concentration examined (1 mM). Interestingly, pretreatment with caffeine suppressed EGF‐induced phosphorylation and activation of Akt and ribosomal p70 S6 protein kinase (p70 S6K), a target of Akt, without inhibiting phosphatidylinositol 3‐kinase (PI3K) activation. The inhibition of Akt activation of caffeine was not a result of its adenosine receptor antagonism. Because Akt plays a key role in signal transduction pathways leading to cell proliferation and apoptosis, our results provide novel insight into possible mechanisms of the chemotherapeutic effect of caffeine. © 2005 Wiley‐Liss, Inc.

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