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Role of protein-phosphorylation events in the anoxia signal-transduction pathway leading to the inhibition of total protein synthesis in isolated hepatocytes.

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Document type : Article de périodique (Journal article) – In Vitro, Journal Article, Research Support, Non-U.S. Gov't
Abstract :

Incubation of isolated hepatocytes under N2/CO2 (no O2) produced a rapid and strong inhibition of overall polypeptide biosynthesis, which was neither related to cell death nor to the appearance of specific stress proteins. Treatment of the cells with the tyrosine-kinase inhibitor genistein or with the serine/threonine-protein-kinase inhibitor H7 did not modify the impairment of protein synthesis induced by oxygen deprivation, indicating that such signal-transduction pathways are probably not involved in the anoxia-mediated effect. Okadaic acid (100 nM) and Na3VO4 (1 mM) reduced the incorporation of [14C]Leu into proteins of hepatocytes maintained under aerobic conditions (93.3 kPa O2). The effects of oxygen deprivation and okadaic acid were additive, whereas sodium vanadate did not enhance the impairment of protein synthesis induced by anoxia. This observation suggests that a common mechanism, involving the net phosphorylation of protein tyrosine residues, that is insensitive to genistein might participate in the negative control of the translation induced by oxygen deprivation. The effect of anoxia on the synthesis of proteins was fully and rapidly reversible upon the restoration of oxygen supply, thus indicating that hepatocytes are able to sense O2. Although high concentrations of cobalt chloride partially mimic the effect of oxygen deprivation on protein biosynthesis, the nature of such an oxygen sensor remains unknown, and appears unlikely to be a part of a classic haem protein.
Publication date : 1997
Journal information : "European journal of biochemistry / FEBS" - Vol. 249, no. 1, p. 121-6 (1997)
Peer reviewed : yes
issn : 0014-2956
Publication status : Publié
Affiliation : UCL
MESH Subject : Animals ; Cell Hypoxia - physiology ; Cell Survival ; Cobalt - pharmacology ; Enzyme Inhibitors - pharmacology ; Liver - cytology - metabolism ; Male ; Phosphoprotein Phosphatases - antagonists & inhibitors ; Phosphorylation ; Protein Biosynthesis ; Protein Kinase Inhibitors ; Proteins - metabolism ; Rats ; Rats, Wistar ; Signal Transduction - physiology
Links :
Bibliographic reference Tinton, S ; Tran-Nguyen, Q N ; Buc Calderon, Pedro. Role of protein-phosphorylation events in the anoxia signal-transduction pathway leading to the inhibition of total protein synthesis in isolated hepatocytes.. In: European journal of biochemistry / FEBS, Vol. 249, no. 1, p. 121-6 (1997)
Permanent URL http://hdl.handle.net/2078.1/12379

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