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  • cell growth  (2)
  • transmembrane electron transport  (2)
  • 1985-1989  (3)
  • 1965-1969
  • 1
    Electronic Resource
    Electronic Resource
    Transplasmalemma electron transport is changed in simian virus 40 transformed liver cells (1986)
    Springer
    Journal of bioenergetics and biomembranes 18 (1986), S. 471-485 
    Details
    ISSN: 1573-6881
    Keywords: Plasma membrane ; pyridine nucleotide oxidation ; temperature sensitive SV40 ; liver cells ; transmembrane electron transport ; cell transformation ; enzyme kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Physics
    Notes: Abstract Transplasma membrane electron transport activity by fetal rat liver cells (RLA209-15) infected with a temperature-sensitive strain of SV40 has been measured with cells grown at the restrictive temperature (40°C) and permissive temperature (33°C). The transformed cells grown at 33°C had only one-half the rate of external ferricyanide reduction as the nontransformed cells held at 40°C. Both theK m andV max for ferricyanide reduction were changed in the transformed state. The change inV max can be based on a decrease of NADH in the transformed cells. The change in rate with ferricyanide does not depend on change in surface charge. Reduction of external ferricyanide was accompanied by release of protons from the cells. The ratio of protons released to ferricyanide reduced was higher in the transformed cells than in the non-transformed cells. Since the transplasma membrane electron transport has been shown to stimulate cell growth under limiting serum, the changes in the plasma membrane electron transport and proton release in transformed cells may relate to modification of growth control.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00743145
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  • 2
    Electronic Resource
    Electronic Resource
    Ruthenium ammine complexes as electron acceptors for growth stimulation by plasma membrane electron transport (1987)
    Springer
    Journal of bioenergetics and biomembranes 19 (1987), S. 69-81 
    Details
    ISSN: 1573-6881
    Keywords: Plasma membrane ; transmembrane electron transport ; ruthenium complexes ; cell growth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Physics
    Notes: Abstract Ammineruthenium(III) complexes have been found to act as electron acceptors for the transplasmalemma electron transport system of animal cells. The active complexes hexaammineruthenium(III), pyridine pentaammineruthenium(III), and chloropentaammineruthenium(III) range in redox potential (E′ 0) from 305 to −42 mV. These compounds also act as electron acceptors for the NADH dehydrogenase of isolated plasma membranes. Stimulation of HeLa cell growth, in the absence of calf serum, by these compounds provides evidence that growth stimulation by the transplasma membrane electron transport system is not entirely based on reduction and uptake of iron.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00769733
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  • 3
    Electronic Resource
    Electronic Resource
    Involvement of transferrin in the reduction of iron by the transplasma membrane electron transport system (1987)
    Springer
    Journal of bioenergetics and biomembranes 19 (1987), S. 535-549 
    Details
    ISSN: 1573-6881
    Keywords: Plasma membrane oxidoreductase ; transferrin ; transferrin receptor ; iron transport ; cell growth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Physics
    Notes: Abstract Nonpermeable electron acceptors can be reduced by a transplasma membrane electron transport system in suspensions of intact cells. Here we report that diferric transferrin is reduced by HeLa S3 cells. The reduction is recorded spectrophotometrically as the formation of the ferrous complex of bathophenanthroline disulfonate. Ferric ammonium citrate can also be used as an electron acceptor, and the presence of low concentrations of diferric transferrin greatly stimulates the reduction of trivalent iron under these conditions. Likewise very low concentrations of ferricyanide, which does not give rise to a ferrous bathophenanthroline disulfonate complex formation, have a strong stimulatory effect on the complex formation when ferric ammonium citrate is the source of ferric iron. Apotransferrin is a potent inhibitor of the reaction. The inhibition occurs at the concentration necessary for complete occupancy of the transferrin receptors. The inhibition can be demonstrated also when high concentrations of ferricyanide are used as electron acceptor. The possible mechanism behind the reported phenomena is discussed, and it is concluded that the transplasma membrane electron transport system can be involved in the process of cellular iron uptake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00770036
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