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Activation of MAPK by potassium bisperoxo(1,10-phenanthroline)oxovanadate (V).

Abstract：

:Potassium bisperoxo(1,10-phenantroline)oxovanadate (V) [bpV(phen)] is a potent protein tyrocine phosphatase inhibitor which mediates a variety of biological effects. The aim of these studies was to examine the role(s) of mitogen activated protein kinase (MAPK) pathways in PC12 cell proliferation and toxicity by bpV(phen). BpV(phen) exerts a bimodal effect in PC12 cells: proliferation at low and cell death at higher micromolar concentrations. Activation of MAPK by bpV(phen) depends on time and concentration. The phosphorylation pattern of extracellular regulated kinases (ERK 1/2), c-jun N-terminal activated kinases (JNK) and p38 in PC12 cells is strikingly different. Activation of JNK is sustained in PC12 cells. In contrast, ERK 1/2 activation is transient and treatment with PD98059 indicates that ERK activation by bpV(phen) is partly independent from the ras-MEK pathway. Stability studies of bpV(phen) in DMEM and PBS showed linear relationship with T1/2 about 6 h and 10 days in DMEM and PBS, respectively. Comparison between the time courses of MAPK activation and kinetics of bpV(phen) decomposition as assessed by 51V-NMR analysis show that the initial and maximal phosphorylation signals are produced in the presence of the complex bpV(phen) and not caused by the decomposition products of bpV(phen).

journal_name

Neurochem Int

journal_title

Neurochemistry international

authors

Cerovac Z,Ban J,Morinville A,Yaccato K,Shaver A,Maysinger D

doi

10.1016/s0197-0186(99)00018-2

subject

Has Abstract

pub_date

1999-04-01 00:00:00

pages

337-44

issue

4

eissn

0197-0186

issn

1872-9754

pii

S0197-0186(99)00018-2

journal_volume

34

pub_type

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