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Cell Signal. 2013 Mar;25(3):666-73. doi: 10.1016/j.cellsig.2012.12.002. Epub 2012 Dec 19.

Tec kinase stimulates cell survival in transfected Hek293T cells and is regulated by the anti-apoptotic growth factor IGF-I in human neutrophils.

Author information

1
Center for Neurosciences, Department of Pharmacology, Vrije Universiteit Brussel, Brussels, Belgium. Ehimpe@gmail.com

Abstract

OBJECTIVE:

Previously, we showed that the phosphatidylinositol-3 kinase (PI(3)K) pathway mediates the anti-apoptotic effects of IGF-I in human neutrophils independently of its down-stream target Akt. In this study, we investigated whether IGF-I regulates Tec kinase, an alternative down-stream target of PI(3)K, in neutrophils and whether this molecule is able to affect apoptosis.

DESIGN:

We investigated the translocation of Tec kinases in neutrophils after stimulation with IGF-I. Furthermore, we transiently and stably transfected Hek293T cells with constructs expressing different forms of Tec kinase and measured the level of cell survival and apoptosis/necrosis through trypan blue exclusion test and Annexin-V/propidium iodide labelling, respectively.

RESULTS:

We show that IGF-I stimulates the translocation of Tec kinase to the membrane in neutrophils in a PI(3)K dependent matter. Overexpression of Tec kinase augments cell survival by inhibition of necrosis. The pro-survival effect is attenuated by the deletion of the kinase domain but not by inactivation of this domain by a single amino acid substitution.

CONCLUSION:

Tec kinase can act as a prosurvival factor and is regulated by IGF-I in human neutrophils through PI(3)K activation.

PMID:
23261945
DOI:
10.1016/j.cellsig.2012.12.002
[Indexed for MEDLINE]

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