Activation of signal transducer and activator of transcription factor 1 by interleukins-13 and -4 in cultured human bronchial smooth muscle cells
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概要
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The family of signal transducer and activator of transcription (STAT) factors play a critical role in the signaling of many cytokines. In addition to the involvement of STAT6 in allergic bronchial asthma, both STAT1 and STAT3 have also been implicated. However, there is little information whether or not the T helper 2 cytokines, which cause several key features of allergic asthma, really induce the activation of STAT1 and/or STAT3 in bronchial smooth muscle (BSM) cells. In the present study, the effects of interleukin-13 (IL-13) and IL-4 on activation of these STAT molecules were examined in cultured human bronchial smooth muscle cells (hBSMCs). After a starvation period, the hBSMCs were treated with 100 ng/ml of IL-13 or IL-4. Total protein samples were prepared at intervals of 1, 3, 6, 12 and 24 hours after the cytokine treatment, and Western blot analyses for total and tyrosine-phosphorylated STATs molecules were conducted. As a result, ut was found that both IL-13 and IL-4 caused a significant increase in the levels of phosphorylated STAT1. Examination of the time-course revealed a peak of STAT1 phosphorylation at 1 hr after cytokine application. In contrast, neither IL-13 nor IL-4 induced phosphorylation of STAT3. Neither of these cytokines changed the protein expression of the STATs themselves. These findings suggest that STAT1, but not STAT3, might also be one of the crucial signal transducers in the development of BSM hyper-responsiveness, which is one of the causes of AHR in asthmatics.
- 日本平滑筋学会の論文
- 2009-12-01
著者
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TODOROKI Michiko
Department of Pharmacology, School of Pharmacy, Hoshi University
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MISAWA Miwa
Department of Pharmacology, School of Pharmacy, Hoshi University
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Chiba Yoshihiko
Dep. Of Pharmacology School Of Pharmacy Hoshi Univ.
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Chiba Yoshihiko
Department Of Pharmacology School Of Pharmacy Hoshi University
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Misawa Miwa
Department Of Pharmacology School Of Pharmacy Hoshi University
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Misawa M
Hoshi Univ. Tokyo Jpn
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Misawa Miwa
Department Of Applied Pharmacology Hoshi University
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Todoroki Michiko
Department Of Pharmacology School Of Pharmacy Hoshi University
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Chiba Yoshihiko
Department Of Biology School Of Pharmacy Hoshi University
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