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 Signaljournal_title
Cellular signallingauthors
Todorova MG,Fuentes E,Soria B,Nadal A,Quesada Idoi
10.1016/j.cellsig.2008.12.005subject
Has Abstractpub_date
2009-04-01 00:00:00pages
523-8issue
4eissn
0898-6568issn
1873-3913pii
S0898-6568(08)00372-0journal_volume
21pub_type
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journal_title:Cellular signalling
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pub_type: 杂志文章
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doi:10.1016/0898-6568(94)00082-m
更新日期:1995-03-01 00:00:00
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journal_title:Cellular signalling
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doi:10.1016/j.cellsig.2018.09.011
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journal_title:Cellular signalling
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journal_title:Cellular signalling
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journal_title:Cellular signalling
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journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2005.04.011
更新日期:2006-02-01 00:00:00
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abstract::JNK proteins are conserved stress-activated MAP kinases. In C. elegans, the JNK-homolog KGB-1 plays essential roles in protection from heavy metals and protein folding stress. However, the contributions of KGB-1 are age-dependent, providing protection in larvae, but reducing stress resistance and shortening lifespan i...
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