Abstract:
:Previous reports have suggested that the two mitogen-activated protein kinases (MAPKs) in Dictyostelium discoideum, ERK1 and ERK2, can be directly activated in response to external cAMP even though these MAPKs play different roles in the developmental life cycle. To better characterize MAPK regulation, the levels of phosphorylated MAPKs were analyzed in response to external signals. Only ERK2 was rapidly phosphorylated in response to the chemoattractants, cAMP and folate. In contrast, the phosphorylation of ERK1 occurred as a secondary or indirect response to these stimuli and this phosphorylation was enhanced by cell-cell interactions, suggesting that other external signals can activate ERK1. The phosphorylation of ERK1 or ERK2 did not require the function of the other MAPK in these responses. Folate stimulation of a chimeric population of erk1- and gα4- cells revealed that the phosphorylation of ERK1 could be mediated through an intercellular signal other than folate. Loss of ERK1 function suppressed the developmental delay and the deficiency in anterior cell localization associated with gα5- mutants suggesting that ERK1 function can be down regulated through Gα5 subunit-mediated signaling. However, no major changes in the phosphorylation of ERK1 were observed in gα5- cells suggesting that the Gα5 subunit signaling pathway does not regulate the phosphorylation of ERK1. These findings suggest that the activation of ERK1 occurs as a secondary response to chemoattractants and that other cell-cell signaling mechanisms contribute to this activation. Gα5 subunit signaling can down regulate ERK1 function to promote prestalk cell development but not through major changes to the level of phosphorylated ERK1.
journal_name
Cell Signaljournal_title
Cellular signallingauthors
Schwebs DJ,Hadwiger JAdoi
10.1016/j.cellsig.2014.10.009subject
Has Abstractpub_date
2015-01-01 00:00:00pages
147-55issue
1eissn
0898-6568issn
1873-3913pii
S0898-6568(14)00345-3journal_volume
27pub_type
杂志文章abstract::The present study was undertaken to investigate whether purified ras proteins can affect the activity of polyphosphoinositide specific phospholipase C in a cell-free membrane system. For this purpose we used homogenous preparations of the proto-oncogenic (H-ras(gly 12)) and the oncogenic (H-ras(val 12)) forms of the h...
journal_title:Cellular signalling
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abstract::Glycogen synthase kinase 3beta (GSK3beta) is implicated in many biological events, including embryonic development, cell differentiation, apoptosis, and the insulin response. GSK3beta also plays a key role in the Wnt/beta-catenin pathway. The master regulator of the pigmentation microphthalmia-associated transcription...
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journal_title:Cellular signalling
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doi:10.1016/0898-6568(95)00019-l
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journal_title:Cellular signalling
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abstract::Clinical studies have elucidated the negative correlation between microtubules-associated protein 1 light chain 3-B (LC3B) protein expression and overall survival of breast cancer patients. Our previous data demonstrated corticortropin-releasing hormone family (CRHs) suppressed migration of breast cancer cells via CRH...
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doi:10.1016/j.cellsig.2009.09.038
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journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2007.10.030
更新日期:2008-02-01 00:00:00
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journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2004.03.014
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journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2009.09.010
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journal_title:Cellular signalling
pub_type: 杂志文章,评审
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更新日期:1997-12-01 00:00:00
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journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/s0898-6568(96)00119-2
更新日期:1997-01-01 00:00:00
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journal_title:Cellular signalling
pub_type: 杂志文章,评审
doi:10.1016/j.cellsig.2010.03.016
更新日期:2010-09-01 00:00:00
abstract::Signal transducer and activator of transcription 1 (STAT1) is an important mediator for cytokine signal transduction, particularly IFN-γ. Following IFN-γ stimulation, STAT1 is activated through tyrosine phosphorylation. Little is known about the function and regulation of STAT1 dephosphorylation after activation. We s...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2011.04.003
更新日期:2011-08-01 00:00:00
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journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2013.01.012
更新日期:2013-04-01 00:00:00
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journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2004.10.008
更新日期:2005-05-01 00:00:00
abstract::Binding of urokinase-type plasminogen activator (uPA) to its receptor, uPAR, in estrogen receptor-α (ERα) expressing breast cancer cells, transiently activates ERK downstream of FAK, Src family kinases, and H-Ras. Herein, we show that when uPAR is over-expressed, in two separate ERα-positive breast cancer cell lines, ...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2012.05.011
更新日期:2012-09-01 00:00:00
abstract::Several members of the mitogen-activated protein kinase kinase kinase (MAP3K) family including MEKK3 and TGFbeta-activating kinase (TAK1) play nonredundant roles in activation of the NF-kappaB transcription factor. However, the mechanism by which MEKK3 mediates NF-kappaB signaling is not fully understood. In this repo...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2007.12.007
更新日期:2008-04-01 00:00:00
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journal_title:Cellular signalling
pub_type: 杂志文章
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journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2005.09.010
更新日期:2006-08-01 00:00:00
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journal_title:Cellular signalling
pub_type: 杂志文章,评审
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更新日期:2012-04-01 00:00:00
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journal_title:Cellular signalling
pub_type: 杂志文章,评审
doi:10.1016/j.cellsig.2017.10.009
更新日期:2018-01-01 00:00:00
abstract::Cellular growth and glucose uptake are regulated by multiple signals generated by the insulin receptor. The mechanisms of individual modulation of these signals remain somewhat elusive. We investigated the role of CaMKII in insulin signalling in a rat skeletal muscle cell line, demonstrating that CaMKII modulates the ...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2009.01.022
更新日期:2009-05-01 00:00:00
abstract::Recent studies have demonstrated that long non-coding RNAs (lncRNAs) play critical roles in cancer development and progression. However, the mechanism by which lncRNAs contribute to colorectal cancer remains unclear. In this study, we identified the lncRNA, DANCR, which was upregulated in colorectal cancer. The upregu...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2019.109502
更新日期:2020-03-01 00:00:00
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journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/j.cellsig.2008.06.016
更新日期:2008-10-01 00:00:00
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journal_title:Cellular signalling
pub_type: 杂志文章
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更新日期:2016-07-01 00:00:00
abstract::Cannabinoids exert a variety of physiological and pharmacological responses in humans through interaction with specific cannabinoid receptors. Cannabinoid receptors described to date belong to the seven-transmembrane-domain receptor superfamily and are coupled through the inhibitory G(i) protein to adenylyl cyclase in...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/s0898-6568(03)00036-6
更新日期:2003-09-01 00:00:00
abstract::Previous studies implicating a role for protein kinase C (PKC) in mediating stimulation of cellular responses by physiological agonists have relied on use of non-specific inhibitors or direct stimulation of PKC by phorbol esters. However, much of this evidence is questionable. Here, we have investigated the effects of...
journal_title:Cellular signalling
pub_type: 杂志文章
doi:10.1016/s0898-6568(96)00097-6
更新日期:1997-01-01 00:00:00