Blog of Signaling Pathways

Inhibition of PRMT5 suppresses osteoclast differentiation and partially protects against ovariectomy-induced bone loss through downregulation of CXCL10 and RSAD2

635 views | Aug 29 2017

Dong Y et al. found that PRMT5 is an activator of osteoclast differentiation and inhibition of PRMT5 partially suppressed osteoclastogenesis through downregulation of CXCL10 and RSAD2. [Read the Full Post]

Rhein Inhibits AlkB Repair Enzymes and Sensitizes Cells to Methylated DNA Damage

925 views | Aug 28 2017

Li Q et al. revealed that rhein binds to AlkB repair enzymes in vitro and promotes thermal stability in vivo In addition, we have determined a new structural complex of rhein bound to AlkB, which shows that rhein binds to a different part of the active site in AlkB than it binds to in fat mass and obesity-associated protein (FTO). [Read the Full Post]

Leptin-STAT3-G9a Signaling Promotes Obesity-Mediated Breast Cancer Progression

779 views | Aug 28 2017

Chang CC et al. showed how targeting STAT3-G9a signaling regulates CSC plasticity during obesity-related breast cancer progression, suggesting a novel therapeutic paradigm to suppress CSC pools and limit breast malignancy. [Read the Full Post]

Identification of cytotoxic agents disrupting synovial sarcoma oncoprotein interactions by proximity ligation assay

1514 views | Aug 27 2017

Laporte AN et al. report use of the proximity ligation assay to confirm the oncogenic association of SS18-SSX with its co-factor TLE1 in multiple human synovial sarcoma cell lines and in surgically-excised human tumor tissue. SS18-SSX/TLE1 interactions are disrupted by class I HDAC inhibitors and novel small molecule inhibitors. This assay can be applied in a high-throughput format for drug discovery in fusion-oncoprotein associated cancers where key effector partners are known. [Read the Full Post]

Liraglutide attenuates the osteoblastic differentiation of MC3T3‑E1 cells by modulating AMPK/mTOR signaling

2653 views | Aug 27 2017

Hu XK et al. study demonstrate that liraglutide attenuates osteoblastic differentiation of MC3T3‑E1 cells via modulation of AMPK/mTOR signaling. The present study revealed a novel function of liraglutide, which contributes to the understanding of its pharmacological and physiological effects in clinical settings. [Read the Full Post]

miR-18a promotes cell proliferation of esophageal squamous cell carcinoma cells by increasing cylin D1 via regulating PTEN-PI3K-AKT-mTOR signaling axis

0 views | Aug 25 2017

Zhang W et al. demonstrated the upregulation of miR-18a promoted cell proliferation by increasing cylin D1 via regulating PTEN-PI3K-AKT-mTOR signaling axis, suggesting that small molecule inhibitors of AKT-mTOR signaling are potential agents for the treatment of ESCC patients with upregulation of miR-17-92 cluster. [Read the Full Post]

Visfatin attenuates the ox-LDL-induced senescence of endothelial progenitor cells by upregulating SIRT1 expression through the PI3K/Akt/ERK pathway

0 views | Aug 25 2017

Ming GF et al. suggested that the treatment of EPCs with visfatin markedly attenuates the ox-LDL-induced senescence of EPCs by upregulating SIRT1 expression through the PI3K/Akt/ERK pathway. [Read the Full Post]

Brain-Penetrating Histone Deacetylase Inhibitor RG2833 Reduces the Viability of Human Malignant Melanoma Cell Lines SK-MEL-5 and SK-MEL-28 in vitro

1497 views | Aug 24 2017

Lauren Green found that concentrations of RG2833 that effectively inhibited HDAC activity also resulted in reduced melanoma cell growth and viability. These results demonstrate the effectiveness of RG2833 in reducing the growth and viability of malignant melanoma cells in vitro and warrant further investigation of the potential therapeutic use of RG2833 and related compounds in the battle against cancer. [Read the Full Post]

Differential compensation mechanisms define resistance to PI3K inhibitors in PIK3CA amplified HNSCC

683 views | Aug 24 2017

Michmerhuizen NL et al. suggestED that inhibition of the PI3K and Ras-MEK-ERK pathways might be effective in some HNSCC patients; however, it also prompts the study of additional resistance mechanisms to identify synergistic combination therapies for tumors resistant to these di-therapies. [Read the Full Post]

Sodium phenylbutyrate antagonizes prostate cancer through the induction of apoptosis and attenuation of cell viability and migration

1573 views | Aug 23 2017

Xu Y et al. found that the viability of PCa cells was significantly inhibited by SPB treatment. As illustrated by flow cytometry, for DU145 cell line the average apoptotic rate of SPB-treated cells was significantly lower than that of the control group (P<0.05); similar results were also seen for PC3 (P<0.05). SPB administration also attenuated the colony formation and migration abilities in both cell lines. The expression level of survivin in SPB-treated cells was significantly downregulated, while the phosphorylation of p-38 and ERK was enhanced. Furthermore, in vivo tumor formation of both cell lines was suppressed by SPB as well. [Read the Full Post]

Acetylation of p53 Protein at Lysine 120 Up-regulates Apaf-1 Protein and Sensitizes the Mitochondrial Apoptotic Pathway

1762 views | Aug 23 2017

Yun T et al. found that histone deacetylase (HDAC) inhibitors, including butyrate, augment Lys-120 acetylation of p53 and thus Apaf-1 expression by inhibiting HDAC1. In p53-null cells, transfection of wild-type but not K120R mutant p53 can restore the p53-dependent sensitivity to butyrate. Strikingly, transfection of acetylation-mimicking K120Q mutant p53 is sufficient to up-regulates Apaf-1 in a manner independent of butyrate treatment. Therefore, HDAC inhibitors can induce p53 acetylation at lysine 120, which in turn enhances mitochondrion-mediated apoptosis through transcriptional up-regulation of Apaf-1. [Read the Full Post]

Targeted knockdown of polo-like kinase 1 alters metabolic regulation in melanoma

845 views | Aug 22 2017

Gutteridge RE et al. suggested that PLK1 may be an important regulator of metabolism maintenance in melanoma cells. [Read the Full Post]

Vacuolin-1 inhibits autophagy by impairing lysosomal maturation via PIKfyve inhibition

849 views | Aug 22 2017

Sano O et al. concluded that PIKfyve inhibitors are novel chemical tools for regulating autophagy. [Read the Full Post]

Fisetin, a dietary phytochemical, overcomes Erlotinib-resistance of lung adenocarcinoma cells through inhibition of MAPK and AKT pathways

866 views | Aug 21 2017

Zhang L et al. showed that Fisetin effectively increased sensitivity of Erlotinib-resistant lung cancer cells to Erlotinib, possibly by inhibiting aberrant activation of MAPK and AKT signaling pathways resulted from AXL suppression. [Read the Full Post]

Checkpoint kinase inhibitor AZD7762 strongly sensitises urothelial carcinoma cells to gemcitabine

1585 views | Aug 20 2017

Isono M et al. showed that AZD7762 enhanced sensitivity of urothelial carcinoma cells to gemcitabine by inhibiting DNA repair and disturbing checkpoints. Combining gemcitabine with CHK1 inhibition holds promise for urothelial cancer therapy. [Read the Full Post]

Plasmonic nanocarrier grid-enhanced Raman sensor for studies of anticancer drug delivery

1095 views | Aug 20 2017

Kurzątkowska K et al. demonstrated that the proposed nanocarrier SERS sensor can be utilized to investigate attachment of targeting ligands to nanocarriers (attachment of folic acid ligand recognized by folate receptors of cancer cells is described). Further testing of the nanocarrier SERS sensor involved drug release induced by lowering pH and increasing GSH levels, both occurring in cancer cells. The proposed sensor can be utilized for a variety of drugs and targeting ligands, including those which are Raman inactive, since the linkers can act as the Raman markers, as illustrated with mercaptobenzoic acid and para-aminothiophenol. [Read the Full Post]

Hyperactivation of ATM upon DNA-PKcs inhibition modulates p53 dynamics and cell fate in response to DNA damage

0 views | Aug 19 2017

Finzel A et al. revealed a new regulatory interplay in which loss of DNA-PKcs function leads to hyperactivation of ATM and amplification of the p53 response, sensitizing cells for damage-induced senescence. [Read the Full Post]

Downregulation of GLUT4 contributes to effective intervention of estrogen receptor-negative/HER2-overexpressing early stage breast disease progression by lapatinib

0 views | Aug 19 2017

Acharya S et al. indicated that lapatinib, through its inhibition of key signaling pathways and tumor-promoting metabolic events, is a promising agent for the prevention/early intervention of ER-/HER2+ breast cancer progression. [Read the Full Post]

TIMP-1 expression induced by IL-32 is mediated through activation of AP-1 signal pathway

0 views | Aug 18 2017

Xu H, et al. believed that IL-32 might be involved in the pathogenesis of hepatic fibrosis by inducing TIMP-1 expression. [Read the Full Post]

Phosphorylation of the RNA-binding protein Dazl by MAPKAP kinase 2 regulates spermatogenesis

0 views | Aug 18 2017

Williams PA et al. suggested that signaling by the p38-MK2 pathway is a negative regulator of spermatogenesis via phosphorylation of Dazl. [Read the Full Post]