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Japanese Journal of Cancer Research : Gann logoLink to Japanese Journal of Cancer Research : Gann
. 1989 Jan;80(1):31–40. doi: 10.1111/j.1349-7006.1989.tb02241.x

Altered Expression of a Third Actin Accompanying Malignant Progression in Mouse B16 Melanoma Cells

Shun'ichiro Taniguchi 1,✉, Hiroyuki Sadano 1, Takeo Kakunaga 2, Tsuneo Baba 1
PMCID: PMC5917685  PMID: 2496056

Abstract

The expression of actin was examined and compared in several mouse B16 melanoma cell lines with different metastatic ability, by the use of two‐dimensional gel electrophoresis or horizontal isoelectric focusing. In the mouse B16 melanoma cell lines, the expression of newly found Ax actin (Mr = 43,000, pl = 5.2) decreased with the increase in in vitro and in vivo selection cycles (F number) for high‐metastatic cells. On the contrary, the metastatic ability of each mouse cell line, assessed by lung colony‐forming ability following iv administration, increased with increase in the F number. The half life of Ax actin was much the same as that of β‐and γ‐actin and the different expressions of Ax actin between the low‐ (F=l) and high‐metastatic (F=10) cell lines were attributed to differences in the rate of synthesis but not in the decay rate of Ax actin. The Ax actin was incorporated into the cytoskeletal fraction with the same efficiency as β‐and γ‐actin. The invasiveness of the cells, assessed in vitro using matrigel, was increased with the decrease in Ax expression. The actin stress fibers, observed staining with rhodamine‐conjugated phalloidin, were organized better in a low‐metastatic cell line (F=l) than in a high‐metastatic one (F = 10). These results suggest to us that depression of Ax actin is involved in disorganization of the cytoskeletal system, the cellular flexibility and motility are enhanced and there is a consequent increase in the invasiveness and metastatic potential.

Keywords: Actin, Metastasis, BI6 melanoma

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