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Intercellular communication and the control of growth: X. Alteration of junctional permeability by thesrc gene. A study with temperature-sensitive mutant Rous sarcoma virus

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Summary

To study changes of junctional membrane permeability associated with transformation, the junctions and the nonjunctional membranes of quail embryo-, chick embryo- and mouse-3T3 cell cultures, infected with temperature-sensitive mutant Rous sarcoma virus, were probed with fluorescent-labelled glutamate. Junctional permeability fell in the transformed state. In the quail cells, the fall was detectable within 25 min of shifting the temperature down to the level (permissive) at which tyrosine-phosphorylation by the viralsrc gene product is expressed. This reduction of junctional permeability is one of the earliest manifestations of viral transformation. Normal permeability was restored within 30 min of raising the temperature to the nonpermissive level, a reversibility that could be displayed several times during the span of a cell generation. The reversal seems to reflect a reopening of cell-to-cell channels rather than a synthesis of new ones; it is not blocked by protein-synthesis inhibition. Treatments with cyclic AMP and phosphodiesterase inhibitor or with forskolin, which stimulate serine and threonine phosphorylation—the type of phosphorylation on which normal junctional permeability depends (Wiener & Loewenstein, 1983,Nature 305∶433)—did not abolish, in general, the junctional effect of the virus;src tyrosine-phosphorylation apparently overrides the junctional upregulation mediated by cyclic AMP.

Nonjunctional membrane permeability was not sensibly affected by the virus. It was affected, however, by temperature: lowering the temperature from the nonpermissive to the permissive level caused the nonjunctional permeability to fall, andvice versa. This change was unrelated to transformation. Its secondary effect on junctional transfer is in the opposite direction to that produced by the temperature-activated viral transformation.

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  1. Department of Physiology and Biophysics, University of Miami School of Medicine, 33101, Miami, Florida

    R. Azarnia & W. R. Loewenstein

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  1. R. Azarnia
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  2. W. R. Loewenstein
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Azarnia, R., Loewenstein, W.R. Intercellular communication and the control of growth: X. Alteration of junctional permeability by thesrc gene. A study with temperature-sensitive mutant Rous sarcoma virus. J. Membrain Biol. 82, 191–205 (1984). https://doi.org/10.1007/BF01871629

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