Sphingosine 1-phosphate antagonizes human neutrophil apoptosis via p38 mitogen-activated protein kinase.

Chihab, RifkiLund University,Lunds universitet,Experimentell patologi, Malmö,Forskargrupper vid Lunds universitet,Experimental Pathology, Malmö,Lund University Research Groups (author)

Sphingosine 1-phosphate (SPP) is associated with the regulation of apoptosis, although its role in neutrophil apoptosis remains poorly investigated. Here, we show that exogenous SPP antagonizes spontaneous and anti-Fas-induced apoptosis in neutrophils. Pre-treatment with pertussis toxin clearly reduced the apoptosis-inhibiting capacity of SPP. Consequently, we investigated the involvement of potential modulators of apoptosis that are activated downstream of Gi/G0-coupled receptors. Neither Akt activity nor change in basal activity of c-Jun N-terminal kinases was detected during apoptosis or after adding SPP. In contrast, there was a transient decrease in phosphorylation of both extracellular-regulated kinase (ERK) and p38mitogen-activated protein kinase (MAPK) during both spontaneous and anti-Fas-induced apoptosis. Although exogenous SPP reversed these reductions in kinase activity, experiments with inhibitors of ERK (PD98059) and p38 MAPK (SB203580) revealed that only SB203580 counteracted the effect of SPP. Thus, SPP counteracts neutrophil apoptosis via a Gi/G0protein survival-signalling pathway that includes modulation of p38 MAPK activity.

Ares, IsabellaLund University,Lunds universitet,Experimentell patologi, Malmö,Forskargrupper vid Lunds universitet,Experimental Pathology, Malmö,Lund University Research Groups(Swepub:lu)expp-ipo (author)
Alvarado-Kristensson, MariaLund University,Lunds universitet,Experimentell patologi, Malmö,Forskargrupper vid Lunds universitet,Molekylär patologi, Malmö,Experimental Pathology, Malmö,Lund University Research Groups,Molecular Pathology, Malmö(Swepub:lu)expp-mkr (author)
Andersson, TommyLund University,Lunds universitet,Experimentell patologi, Malmö,Forskargrupper vid Lunds universitet,Experimental Pathology, Malmö,Lund University Research Groups(Swepub:lu)expp-tan (author)
Experimentell patologi, MalmöForskargrupper vid Lunds universitet (creator_code:org_t)

In:Cellular and Molecular Life Sciences: Springer Science and Business Media LLC60:4, s. 776-7851420-90711420-682X

By the author/editor: Chihab, Rifki; Ares, Isabella; Alvarado-Kristen ...; Andersson, Tommy

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Cell Biology

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