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. 1977 Oct;74(10):4491–4495. doi: 10.1073/pnas.74.10.4491

Cyclic AMP, the microtubule-microfilament system, and cancer.

T T Puck
PMCID: PMC431969  PMID: 200918

Abstract

Additional evidence is presented for the previously proposed existence in normal fibroblasts of a cyclic AMP-dependent network of microtubules and microfilaments, which is connected with cell membrane elements on one end and with nuclear structures on the other and whose disorganization leads to malignant transformation. In the presence of cyclic AMP derivatives sufficient to promote integrity of this network, cell growth limitation in suspension, increased transport of alpha-[14C]aminobutyrate, and the relatively tranquilized membrane of the normal fibroblast are also achieved. A pattern of distribution of actin and tubulin has been demonstrated showing aggregated actin deposits which are presumably responsible for the oscillatory knob activity of cells with the transformed habitus. Specific orientations of microtubular and filamentous elements with respect to the nucleus can be demonstrated. The hypothesis that the microtubular-microfilamentous structure conveys growth-regulatory information from the cell membrane to the nucleus and that its disorganization can lead to malignancy has been extended to explain various cellular manifestations.

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Selected References

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