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IGF-I stimulates IL-8 production in the promyelocytic cell line HL-60 through activation of extracellular signal-regulated protein kinase

par Kooijman, Ron;Coppens, Astrid;Peters, Elisabeth
Référence Cellular signalling, 15, 12, page (1091-1098)
Publication Publié, 2003-12

Article révisé par les pairs

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Résumé :

Interleukin (IL)-8 serves as a major chemoattractant for neutrophils and has also been proposed to affect cancer progression. In the present study, we show that IGF-I stimulates IL-8 mRNA expression and IL-8 secretion in the leukemic cell line HL-60. Stimulation of IL-8 expression was completely attenuated by two inhibitors of mitogen-activated protein kinase (MAPK) kinase (MEK), which phosphorylates the MAPKs extracellular-regulated kinase (ERK)1 and ERK2, and by the c-Jun NH2-terminal kinase (JNK) inhibitor SP600125. In contrast, inhibitors of p38 MAPK and phosphatidylinositol-3 kinase (PI3K) did not abrogate the effect of IGF-I. We also show that IGF-I stimulates the activation of ERK1 and ERK2, but we could not detect any effect of IGF-I on the phosphorylation of p38, JNKp46 or JNKp54. Collectively, our results suggest that basal JNK activity and activation of the MEK-ERK pathway are required for upregulation of IL-8 by IGF-I in HL-60 cells. © 2003 Elsevier Inc. All rights reserved.