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    Dimethylnitrosamine inhibits the glucagon-stimulated adenylate cyclase activity of rat liver plasma membranes and decreases plasma membrane fluidity.

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    Authors
    Whetton, Anthony D
    Needham, L
    Margison, Geoffrey P
    Dodd, Nicholas J F
    Houslay, M D
    Affiliation
    Paterson Laboratories, Christie Hospital and Holt Radium Institute, Wilmslow Road, Withington, Manchester M20 9BX, UK
    Issue Date
    1984-06-13
    
    Metadata
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    Abstract
    The effect of the hepatocarcinogen dimethylnitrosamine on rat liver plasma membrane adenylate cyclase activity and lipid fluidity was assessed. Glucagon-stimulated adenylate cyclase activity exhibited a complex response to increasing concentrations of dimethylnitrosamine, whereas fluoride-stimulated adenylate cyclase activity was progressively inhibited. Maximal inhibitory effects were observed at a concentration of 15 mM in both cases. The activity of detergent-solubilized adenylate cyclase was unaffected by dimethylnitrosamine. ESR analysis using a fatty acid spin probe showed that dimethylnitrosamine produced a marked, dose-dependent reduction in the fluidity of the plasma membrane with a maximal effect occurring at 20 mM. Dimethylnitrosamine also elevated the temperature at which the lipid phase separation occurred in rat liver plasma membranes, from 28 degrees C to 31 degrees C. The non-carcinogenic but structurally similar compound, dimethylamine hydrochloride neither inhibited adenylate cyclase nor decreased plasma membrane fluidity. It is suggested that the decrease in membrane fluidity, induced by dimethylnitrosamine, via its effects on membrane fluidity, could influence plasma membrane function and cellular regulation.
    Citation
    Dimethylnitrosamine inhibits the glucagon-stimulated adenylate cyclase activity of rat liver plasma membranes and decreases plasma membrane fluidity. 1984, 773 (1):106-12 Biochim Biophys Acta
    Journal
    Biochimica et Biophysica Acta
    URI
    http://hdl.handle.net/10541/123940
    DOI
    10.1016/0005-2736(84)90555-8
    PubMed ID
    6329276
    Type
    Article
    Language
    en
    ISSN
    0006-3002
    ae974a485f413a2113503eed53cd6c53
    10.1016/0005-2736(84)90555-8
    Scopus Count
    Collections
    All Paterson Institute for Cancer Research

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