Activation of PI3K-Akt pathway mediates antiapoptotic effects of β-adrenergic agonist in airway eosinophils

Kentaro Machida, Hiromasa Inoue, Koichiro Matsumoto, Miyuki Tsuda, Satoru Fukuyama, Hiroshi Koto, Hisamichi Aizawa, Yasuko Kureishi, Nobuyuki Hara, Yoichi Nakanishi

研究成果: ジャーナルへの寄稿学術誌査読

39 被引用数 (Scopus)


β-Adrenoceptor agonists reportedly decrease spontaneous apoptosis of peripheral blood eosinophils; however, its signaling pathway is unknown. Survival signals can be elicited by the activation of phosphatidylinositol 3-kinase (PI3K) and Akt, both of which are known to be potent regulators of apoptosis, and Akt in turn inactivates Forkhead transcription factors, including FKHR (Forkhead in rhabdomyosarcoma). We have investigated the effect of β-agonists on apoptosis of local eosinophils isolated from the airways and the involvement of PI3K, Akt, and FKHR in its survival signal. Eosinophils obtained from immunized mice by bronchoalveolar lavage after allergen provocation underwent apoptosis in a time-dependent manner. Incubation of eosinophils with isoproterenol or formoterol dose-dependently inhibited both spontaneous eosinophil apoptosis and apoptosis induced by Fas receptor activation. Incubation with cAMP or forskolin also inhibited eosinophil apoptosis. The PI3K inhibitors wortmannin and LY-294002 and an Akt inhibitor, 1-L-6-hydroxymethyl-chiro-inositol 2-(R)-2-O-methyl-3-O-octadecylcarbonate, but not a mitogen-activated protein kinase kinase inhibitor PD-98059, blocked isoproterenol-mediated eosinophil survival. Wortmannin also inhibited cAMP-mediated eosinophil survival. Isoproterenol rapidly induced phosphorylation of Akt and FKHR in eosinophils in a PI3K-dependent manner. These findings indicate that the PI3K-Akt-FKHR pathway conveys a critical survival signal induced by β-agonists in airway eosinophils.

ジャーナルAmerican Journal of Physiology - Lung Cellular and Molecular Physiology
5 32-5
出版ステータス出版済み - 5月 2005

All Science Journal Classification (ASJC) codes

  • 生理学
  • 呼吸器内科
  • 生理学(医学)
  • 細胞生物学


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