okadaic acid/sarcoma

We have used myelin basic protein immobilized in sodium dodecyl sulfate-polyacrylamide gels to identify protein kinases after gel electrophoresis, followed by protein kinase reactions. This technique has permitted us to detect three protein kinases in serum-deprived cells transformed by p60src. On

The binding of tumor necrosis factor (TNF) to a human osteogenic sarcoma cell line (Saos-2) was investigated. These cells express two types of receptors as determined by specific monoclonal antibodies. Vinblastine induced a down-modulation of these receptors weaker than the one produced by phorbol

By ectopic expression of cDNAs derived from a Ewing sarcoma cell line in NIH3T3 cells, we isolated a transforming gene (est). Sequence analysis revealed homology to the cot oncogene, which encodes a novel serine kinase. Whereas the cot product was truncated at its carboxy-terminal end as a result of

Serum amyloid A (SAA) is a plasma protein whose synthesis is markedly increased in the liver during the inflammatory process. Previous analysis of SAA promoter function implicated the involvement of the CCAAT/enhancer-binding protein (C/EBP) in controlling this process. In this study, using

We previously reported that the activation of the M promoter of the human choline acetyltransferase (ChAT) gene by butyrate and trapoxin in transfected CHP126 cells is blocked by PD98059, a specific mitogen-activated protein kinase kinase (MEK) inhibitor (E. Espinos and M. J. Weber, Mol. Brain Res.

The effect of the tumor promoter 4 beta-phorbol 12-myristate 13-acetate and of the phosphatases inhibitor okadaic acid on the binding of tumor necrosis factor-alpha (TNF-alpha) to a human osteogenic sarcoma cell line (Saos-2) was investigated. Both substances prevented almost completely TNF binding

Serine/threonine (Ser/Thr) protein phosphatase 2A (PP2A) has been implicated as a novel component of the mammalian target of rapamycin (mTOR) signaling pathway. Recently we have demonstrated that mTOR regulates cell motility in part through p70 S6 kinase 1 (S6K1) and eukaryotic initiation factor 4E

The abundant, cytoplasmic 90-kDa heat-shock protein associates transiently with the Rous sarcoma virus oncogenic protein tyrosine kinase, pp60v-src, directs its cellular trafficking and negatively regulates its kinase activity. Here we report that the serine/threonine phosphatase inhibitor, okadaic

Integrin alpha2beta1 is a heterodimeric transmembrane receptor for collagens. In osteogenic cells the expression of alpha2beta1 integrin is induced by both Kirsten sarcoma virus and chemical transformation. The association of alpha2 integrin with transformed cell phenotype was studied further by

OBJECTIVE The present study was undertaken to look for an agent or agents able to modulate the cytotoxic effect of 5-fluorouracil (FUra) and to investigate the role of serine-threonine phosphatase inhibitors on the cytotoxic effect of FUra. METHODS The cytotoxicities of FUra and protein phosphatase

To study the mechanism by which v-mos induces cell transformation, we generated a transformed rat cell line (DTM) containing two functional copies of mos, one encoding the p37v-mos of the m1 wild-type strain of Moloney murine sarcoma virus (Mo-MuSV) and the other the p85gag-mos fusion protein of the