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Intensification and redistribution of protrusive activity is a feature of tumor transformation and is associated with an increase of the invasive potential of cells

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Biochemistry (Moscow), Supplement Series A: Membrane and Cell Biology Aims and scope

Abstract

The abilities of tumor cells to invade and metastasize are frequent causes of death of cancer patients. Studying the mechanisms of cell motility alterations and acquisition of enhanced metastatic potential as the result of transformation is an important aspect in current cell biology. The initial and determinant step of cell motility is the formation of active cell edge with protrusions based on the Arp2/3-dependent actin polymerization. We used three different cell systems as examples of different models of tumor transformation to study the alteration and redistribution of protrusive activity caused by transformation in fibroblasts. We analyzed relationships between detected alterations and the acquisition of increased invasive potential by cells. Active edge of untransformed fibroblasts occupies about 50% of the cell perimeter and is concentrated at the cell front. There are well pronounced stable regions at the lateral cell edges. Tumor transformation causes redistribution of protrusive activity of fibroblasts irrespective of their origin and the nature of transforming agents. The length of active edges significantly increases, up to 92% of the total perimeter in fibrosarcoma cells of tumor origin. These cells have practically no stable edges. The intensity of protrusive activity of transformed cells is also increased. Single transformed cells show a decrease in the directionality and rate of migration on 2D substrate without special stimulation. Instead, they gain the capacity to migrate in 3D and to invade matrigel. These abilities increase in parallel with the intensification of edge activity. We showed that invasive abilities are not associated with the activation of matrix metalloproteinases in the studied cell systems. Our data demonstrate that the increase of length of active edge could be considered as an additional feature of cell transformation together with the reduction of stress fiber and focal adhesions and that the excessive protrusive activity results in the development of explorative migration of tumor cells.

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Authors and Affiliations

  1. Blokhin Russian Cancer Research Center, Ministry of Health of the Russian Federation, Kashirskoe shosse 24, Moscow, 115478, Russia

    M. E. Lomakina, M. S. Shutova, A. Y. Zhuravskaya & A. Y. Alexandrova

Authors
  1. M. E. Lomakina
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  2. M. S. Shutova
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  3. A. Y. Zhuravskaya
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  4. A. Y. Alexandrova
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Correspondence to A. Y. Alexandrova.

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Original Russian Text © M.E. Lomakina, M.S. Shutova, A.Y. Zhuravskaya, A.Y. Alexandrova, 2017, published in Biologicheskie Membrany, 2017, Vol. 34, No. 1, pp. 32–46.

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Lomakina, M.E., Shutova, M.S., Zhuravskaya, A.Y. et al. Intensification and redistribution of protrusive activity is a feature of tumor transformation and is associated with an increase of the invasive potential of cells. Biochem. Moscow Suppl. Ser. A 11, 35–47 (2017). https://doi.org/10.1134/S1990747816040152

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  • DOI: https://doi.org/10.1134/S1990747816040152

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