Lysophosphatidic acid induces Ca2+ mobilization and c-Myc expression in mouse embryonic stem cells via the phospholipase C pathway.

Abstract:

:Embryonic stem cells (ESC) are pluripotent and could be maintained in vitro in a self-renewing state indefinitely, at the same time preserving their potential to differentiate towards more specific lineages. Despite the progress in the field, the complex network of signalling cascades involved in the maintenance of the self-renewing and pluripotent state remains not fully understood. In the present study, we have investigated the role of lysophosphatidic acid (LPA), a potent mitogen present in serum, in Ca(2+) signalling and early gene activation in mouse ESC (mESC). In these cells, we detected the expression of the G-protein coupled LPA receptor subtypes LPA(1), LPA(2) and LPA(3). Using fluorescence Ca(2+) imaging techniques, we showed that LPA induced an increase in intracellular Ca(2+) concentration. This increase was also observed in the absence of extracellular Ca(2+), suggesting the involvement of internal stores. Pre-treatment with BAPTA-AM, thapsigargin or U-73122 efficiently blocked this Ca(2+) release, indicating that LPA was evoking Ca(2+) mobilization from the endoplasmic reticulum via the phospholipase C (PLC) pathway. Interestingly, this signalling cascade initiated by LPA was involved in inducing the expression of the Ca(2+)-dependent early response gene c-myc, a key gene implicated in ESC self-renewal and pluripotency. Additionally, LPA increased the proliferation rate of mESC. Our findings therefore outline the physiological role of LPA in mESC.

journal_name

Cell Signal

journal_title

Cellular signalling

authors

Todorova MG,Fuentes E,Soria B,Nadal A,Quesada I

doi

10.1016/j.cellsig.2008.12.005

subject

Has Abstract

pub_date

2009-04-01 00:00:00

pages

523-8

issue

4

eissn

0898-6568

issn

1873-3913

pii

S0898-6568(08)00372-0

journal_volume

21

pub_type

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