MAPK pathway

Colorectal cancer (CRC) represents a common malignancy in gastrointestinal tract. Iodine-125 (125I) seed implantation is an emerging treatment technology for unresectable tumors. This study investigated the mechanism of 125I seed in the function of CRC cells.

13p vielonmusk 21-01-2022 14 0   Download

The expression of the choline acetyltransferase (ChAT) enzyme that synthesizes the neurotransmitter acetylcholine (ACh) is upregulated by ciliary neurotrophic factor (CNTF). We studied the involvement of the mitogen-activated protein kinase (MAPK) pathway in regulating ChAT expression in a murine septal cell line. Surprisingly, we found that PD98059 and U0126, two structurally distinct inhibitors of MAPK kinase (MEK1), increased both basal and CNTF-induced ACh production.

9p research12 01-06-2013 29 4   Download

Imidazolium trans-imidazoledimethyl sulfoxide-tetrachlo-roruthenate (NAMI-A) is a novel ruthenium-containing experimental antimetastatic agent. Compelling evidence ascribes apivotal role toendothelial cells in theorchestration of tumor angiogenesis and metastatic growth, suggesting antiangiogenic therapy as an attractive approach for anticancer treatment.

10p tumor12 22-04-2013 42 2   Download

In the fission yeastSchizosaccharomyces pombethe Wak1p/ Win1p-Wis1p-Sty1p stress-activated protein kinase (SAPK) pathway relays environmental signals to the transcriptional machinery and modulates gene expression via a cascade of proteinphosphorylation. Cells ofS. pombesubjected tocold shock (transfer from 28
Cto15
C) transiently activated the Sty1p mitogen-activated protein kinase (MAPK) by phosphorylation.

10p tumor12 22-04-2013 47 2   Download

The matrix metalloproteinase (MMP) family degrades the extracellular matrix. One member of this family, MMP-1, initiates the breakdown of interstitial collagens. The expression ofMMP-1 is controlled by themitogen activated protein kinase (MAPK) pathway(s) via the activity of acti-vator protein-1 (AP-1) and polyoma enhancing activity-3/ E26 virus (PEA3/ETS) transcription factors through con-sensus binding sites present in the promoter.

10p tumor12 20-04-2013 31 2   Download

The protein-modifying agent arsenite stimulates glucose uptake in 3T3-L1 adipocytes. In the current study we have analysed the signalling pathways that contribute to this response. By subcellular fractionation we observed that arsenite, like insulin, induces translocation of the GLUT1 and GLUT4 glucose transporters from the low-density membrane fraction to the plasma membrane. Arsenite did not activate early steps of the insulin receptor (IR)-signalling pathway and the response was insensitive to inhibition of phosphatidylinositol-3¢-kinase (PI-3¢)kinaseby wortman-nin. ...

13p tumor12 20-04-2013 36 3   Download

We used two inhibitors of the signaling enzyme phosphatidylinositol 3-kin-ase (PtdIns3K), wortmannin and LY294002, to evaluate the potential involvement of PtdIns3K in the activation of the MAP kinases (MAPK), Erk1 and Erk2. In dose–response studies carried out on six different cell lines and a primary cell culture, we analyzed the ability of the inhibitors to block phosphorylation of protein kinase B⁄akt (PKB⁄akt) at Ser473 as a measure of PtdIns3K activity, or the phosphorylation of Erk1⁄2 at activa-ting Thr⁄Tyr sites as a measure of the extent of activation of MAPK⁄Erk kinase (MEK⁄Erk).

13p fptmusic 11-04-2013 46 2   Download

One of the hallmarks of cAMP is its ability to inhibit proliferation in many cell types, but stimulate proliferation in others. Clearly cAMP has cell type specific effects and the outcome on proliferation is largely attributed to crosstalk from cAMP to the RAS⁄RAF⁄mitogen-activated protein kinase (MAPK) and extracellular signal-regulated kinase (ERK) kinase (MEK)/ ERK pathway. We review the crosstalk between these two ancient and con-served pathways, describing the molecular mechanisms underlying the interactions between these pathways and discussing their possible biological importance....

14p fptmusic 11-04-2013 41 3   Download

As it has not yet been established whether the second messengers involved in the neutrophil response have identical or specific signalling requirements for each physiological function, protein kinase C (PKC) isoforms and mito-gen activated protein kinases (MAPKs) were studied in human chemotaxis triggered by the full agonist for-Met-Leu-Phe-OMe (fMLP-OMe) and the ‘pure’ chemoattractant for-Thp-Leu-Ain-OMe [Thp1,Ain3] analogue. Experiments were performed in the presence or absence of extracellular Ca 2+ , known to be an important modulator of second messengers....

0p awards 05-04-2013 40 2   Download

Hsp105aand Hsp105bare major heat shock proteins in mammalian cells that belong to a subgroup of the HSP70 family, HSP105⁄110. Previously, we have shown that Hsp105ahas opposite effects on stress-induced apop-tosis depending on the cell type. However, it is not fully understood how Hsp105 regulates stress-induced apoptosis.

13p galaxyss3 07-03-2013 41 3   Download

Mitogen-activated protein kinase (MAPK) cascades play important roles in mediating pathogen responses and reactive oxygen species signaling. In plants, MAPKs are classified into four major groups (A–D). Previous stud-ies have mainly focused on groups A and B, but little is known about group C.

12p cosis54 05-01-2013 46 3   Download