1-1-diethyl-2-hydroxy-2-nitrosohydrazine and Carcinoma--Squamous-Cell

1-1-diethyl-2-hydroxy-2-nitrosohydrazine has been researched along with Carcinoma--Squamous-Cell* in 1 studies

Other Studies

1 other study(ies) available for 1-1-diethyl-2-hydroxy-2-nitrosohydrazine and Carcinoma--Squamous-Cell

ArticleYear
Nitric oxide-induced epidermal growth factor-dependent phosphorylations in A431 tumour cells.
    European journal of biochemistry, 2003, Volume: 270, Issue:8

    Nitric oxide (NO*) strongly inhibits the proliferation of human A431 tumour cells. It also inhibits tyrosine phosphorylation of a 170-kDa band corresponding to the epidermal growth factor receptor (EGFR) and induces the phosphorylation at tyrosine residue(s) of a 58-kDa protein which we have denoted NOIPP-58 (nitric oxide-induced 58-kDa phosphoprotein). The NO*-induced phosphorylation of NOIPP-58 is strictly dependent on the presence of EGF. Phosphorylation of NOIPP-58 and inhibition of the phosphorylation of the band corresponding to EGFR are both cGMP-independent processes. We also demonstrate that the p38 mitogen-activated protein kinase (p38MAPK) pathway is activated by NO* in the absence and presence of EGF, whereas the activity of the extracellular signal-regulated protein kinase 1/2 (ERK1/2) and the c-Jun N-terminal kinase 1/2 (JNK1/2) pathways are not significantly affected or are slightly decreased, respectively, on addition of this agent. Moreover, we show that the p38MAPK inhibitor, SB202190, induces rapid vanadate/peroxovanadate-sensitive dephosphorylation of prephosphorylated EGFR and NOIPP-58. We propose that the dephosphorylation of both NOIPP-58 and EGFR are mediated by a p38MAPK-controlled phosphotyrosine-protein phosphatase (PYPP). Activation of the p38MAPK pathway during nitrosative stress probably prevents the operation of this PYPP, allowing NOIPP-58, and in part EGFR, to remain phosphorylated and therefore capable of generating signalling events.

    Topics: Carcinoma, Squamous Cell; DNA, Neoplasm; Epidermal Growth Factor; ErbB Receptors; Humans; Hydrazines; Kinetics; Mitogen-Activated Protein Kinases; Nitric Oxide; Nitric Oxide Donors; Nitrogen Oxides; p38 Mitogen-Activated Protein Kinases; Phosphorylation; Phosphotyrosine; Thymidine; Tumor Cells, Cultured

2003