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Sci Signal. 2017 Mar 28;10(472). pii: eaah4007. doi: 10.1126/scisignal.aah4007.

Sphingosine 1-phosphate signaling through its receptor S1P5 promotes chromosome segregation and mitotic progression.

Author information

1
CNRS, Institut de Pharmacologie et de Biologie Structurale, 31400 Toulouse, France.
2
Université de Toulouse, Université Paul Sabatier, 31400 Toulouse, France.
3
Equipe Labellisée Ligue Contre le Cancer, 31400 Toulouse, France.
4
Clinical Trials Office, Biostatistics Unit, Institut Claudius Regaud, Institut Universitaire du Cancer Toulouse-Oncopôle, 31100 Toulouse, France.
5
INSERM U1111, 69635 Lyon, France.
6
Division of Biochemistry, Aichi Cancer Center Research Institute, Nagoya, Aichi 464-8681, Japan.
7
Lpath Inc., San Diego, CA 92121, USA.
8
CNRS, Institut de Pharmacologie et de Biologie Structurale, 31400 Toulouse, France. olivier.cuvillier@inserm.fr anastassia.hatzoglou@ipbs.fr.

Abstract

Sphingosine kinase 1 (SphK1) promotes cell proliferation and survival, and its abundance is often increased in tumors. SphK1 produces the signaling lipid sphingosine 1-phosphate (S1P), which activates signaling cascades downstream five G protein-coupled receptors (S1P1-5) to modulate vascular and immune system function and promote proliferation. We identified a new function of the SphK1-S1P pathway specifically in the control of mitosis. SphK1 depletion in HeLa cells caused prometaphase arrest, whereas its overexpression or activation accelerated mitosis. Increasing the abundance of S1P promoted mitotic progression, overrode the spindle assembly checkpoint (SAC), and led to chromosome segregation defects. S1P was secreted through the transporter SPNS2 and stimulated mitosis by binding to and activating S1P5 on the extracellular side, which then activated the intracellular phosphatidylinositol 3-kinase (PI3K)-AKT pathway. Knockdown of S1P5 prevented the S1P-induced spindle defect phenotype. RNA interference assays revealed that the mitotic kinase Polo-like kinase 1 (PLK1) was an important effector of S1P-S1P5 signaling-induced mitosis in HeLa cells. Our findings identify an extracellular signal and the downstream pathway that promotes mitotic progression and may indicate potential therapeutic targets to inhibit the proliferation of cancer cells.

PMID:
28351953
DOI:
10.1126/scisignal.aah4007
[Indexed for MEDLINE]

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