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Histochemistry and Cell Biology

, Volume 138, Issue 5, pp 725–736

First Online: 13 July 2012Accepted: 31 May 2012

Abstract

The dynamic reorganization of actin cytoskeleton is regulated by a large number of actin-binding proteins. Among them, the interaction of ADF-cofilin with monomeric and filamentous actin is very important, since it severs actin filaments. It also positively influences actin treadmilling. The activity of ADF-cofilin is reversibly regulated by phosphorylation and dephosphorylation at Ser-3, with the phosphorylated form P-cofilin being inactive. Here, we studied the effects of overexpression of cofilin and two cofilin variants in the human colon adenocarcinoma LS180 cell line. We have generated the LS180 cells expressing three different cofilin variants: WT wild type, Ser 3 Ala S3A constitutively active or Ser 3 Asp S3D constitutively inactive cofilin. The cells expressing WT cofilin were characterized by abundant cell spreading and colocalization of cofilin with the submembranous F-actin. Similar effects were observed in cells expressing S3A cofilin. In contrast, LS180 cells expressing S3D cofilin remained longitudinal in morphology and cofilin was equally distributed within the cell body. Furthermore, the migration ability of LS180 cells expressing different cofilin mutants was analyzed. In comparison to control cells, we have noticed a significant, approximately fourfold increase in the migration factor value of cells overexpressing WT type cofilin. The overexpression of S3D cofilin resulted in an almost complete inhibition of cell motility. The estimation of actin pool in the cytosol of LS180 cells expressing S3A cofilin has shown a significantly lower level of total actin in reference to control cells. The opposite effect was observed in LS180 cells overexpressing S3D cofilin. In summary, the results of our experiments indicate that phosphorylation -status- of cofilin is a factor affecting the actin cytoskeleton organization and migration abilities of colon adenocarcinoma LS180 cells.

KeywordsCofilin Cell migration ABPs Actin cytoskeleton Actin polymerization state  Download fulltext PDF



Autor: Agnieszka Popow-Woźniak - Antonina Joanna Mazur - Hans Georg Mannherz - Maria Malicka-Błaszkiewicz - Dorota Nowak

Fuente: https://link.springer.com/







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