| General information | Literature | Expression | Regulation | Mutation | Interaction |
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Basic Information |
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|---|---|
Gene ID | 7791 |
Name | ZYX |
Synonymous | ESP-2|HED-2;zyxin;ZYX;zyxin |
Definition | zyxin-2 |
Position | 7q32 |
Gene type | protein-coding |
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Title |
Abstract |
| The actin cytoskeleton-associated protein zyxin acts as a tumor suppressor in Ewing tumor cells. | Changes in cell architecture, essentially linked to profound cytoskeleton rearrangements, are common features accompanying cell transformation. Supporting the involvement of the microfilament network in tumor cell behavior, several actin-binding proteins, including zyxin, a potential regulator of actin polymerization, may play a role in oncogenesis. In this work, we investigate the status of zyxin in Ewing tumors, a family of pediatric malignancies of bone and soft tissues, which are mainly associated with a t(11;22) chromosomal translocation encoding the EWS-FLI1 oncoprotein. We observe that EWS-FLI1-transformed murine fibroblasts, as well as human Ewing tumor-derived SK-N-MC cells, exhibit a complete disruption of their actin cytoskeleton, retaining very few stress fibers, focal adhesions and cell-to-cell contacts. We show that within these cells, zyxin is expressed at very low levels and remains diffusely distributed throughout the cytoplasm, instead of concentrating in actin-rich dynamic structures. We demonstrate that zyxin gene transfer into EWS-FLI1-transformed fibroblasts elicits reconstitution of zyxin-rich focal adhesions and intercellular junctions, dramatic reorganization of the actin cytoskeleton, decreased cell motility, inhibition of anchorage-independent growth and impairment of tumor formation in athymic mice. We observe similar phenotypic changes after zyxin gene transfer in SK-N-MC cells, suggesting that zyxin has tumor suppressor activity in Ewing tumor cells. |