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Title

Intracellular interleukin-1 receptor antagonist type 1 antagonizes the stimulatory effect of interleukin-1 alpha precursor on cell motility

Authors
Merhi-Soussi, Faten
Published in Cytokine. 2005, vol. 32, no. 3-4, p. 163-70
Abstract Interleukin (IL)-1alpha, a proinflammatory cytokine, is produced as a 33 kDa protein precursor (preIL-1alpha) which is cleaved to generate the 17 kDa C-terminal mature IL-1alpha (mIL-1alpha) and the 16kDa N-terminal IL-1alpha propiece (NIL-1alpha). The biological effect of IL-1alpha is regulated by the IL-1 receptor antagonist (IL-1Ra), its naturally occurring inhibitor. Four different isoforms of the IL-1Ra have been described, one secreted (sIL-1Ra) and three intracellular (icIL-1Ra1, 2, 3). Whether the icIL-1Ra1 isoform can antagonize some of the biological effects of intracellular IL-1alpha is still unknown. The aim of this study is to investigate effects of preIL-1alpha and icIL-1Ra1 on cell motility in stably transfected ECV304 cells. We show that expression of preIL-1alpha in ECV304 cells significantly increases cell motility. Furthermore, transfection with NIL-1alpha propiece also increases cell motility whereas this stimulatory effect was not observed by addition of exogenous mIL-1alpha, suggesting an intracellular effect of preIL-1alpha mediated by NIL-1alpha propiece. Co-transfection of ECV304 cells with icIL-1Ra1 completely antagonizes the stimulatory effect of preIL-1alpha and NIL-1alpha propiece on cell motility. In conclusion, NIL-1alpha propiece increases ECV304 cell motility and icIL-1Ra1 exerts intracellular functions regulating this stimulatory effect.
Keywords Cell LineTumorCell Movement/physiologyHumansInterleukin 1 Receptor Antagonist ProteinInterleukin-1/antagonists & inhibitors/physiologyIntracellular Fluid/physiologyProtein Precursors/antagonists & inhibitors/genetics/physiologyReceptorsSialoglycoproteins/physiologyTransfection
Identifiers
PMID: 16246569
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Article (Published version) (313 Kb) - public document Free access
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Research group Mécanisme de l'inflammation articulaire (44)
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MERHI-SOUSSI, Faten et al. Intracellular interleukin-1 receptor antagonist type 1 antagonizes the stimulatory effect of interleukin-1 alpha precursor on cell motility. In: Cytokine, 2005, vol. 32, n° 3-4, p. 163-70. https://archive-ouverte.unige.ch/unige:26033

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Deposited on : 2013-01-30

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