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The Journal of Cell Biology, Vol 104, 1521-1526, Copyright © 1987 by The Rockefeller University Press
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SK Stickel and YL Wang
Normal rat kidney cells infected with a Rous sarcoma virus (strain LA23) were used to study the dynamics of alpha-actinin-containing aggregates in transformed cells. Experiments were performed by microinjecting living cells with iodoacetamidotetramethylrhodamine alpha-actinin and allowing the fluorescent analogue to incorporate into cellular structures. Subsequent time-lapse recording indicated that the alpha-actinin-containing aggregates can undergo rapid formation, movement, and breakdown. In addition, experiments using the photobleaching recovery technique indicated that alpha-actinin molecules associated with the aggregates have a very high rate of exchange, whereas those associated with adhesion plaques in normal cells exchange much more slowly. The dynamic properties of alpha- actinin-containing aggregates may be closely related to the changes in cellular behavior upon oncogenic transformation.
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