Abstract
The neurofibromatosis 2 (NF2) gene product, merlin, is a tumor suppressor protein mutated in schwannomas and several other tumors. Merlin, which shares significant homology with the actin-associated proteins ezrin, radixin and moesin (ERM proteins), inhibits cell growth when overexpressed in cell lines. The similarities between merlin and ERM proteins suggest that merlin's growth-regulatory capabilities may be due to alterations in cytoskeletal function. We examined this possibility in rat schwannoma cell lines overexpressing wild-type merlin isoforms and mutant merlin proteins. We found that overexpression of wild-type merlin resulted in transient alterations in F-actin organization, cell spreading and cell attachment. Merlin overexpression also impaired cell motility as measured in an in vitro motility assay. These effects were only observed in cells overexpressing a merlin isoform capable of inhibiting cell growth and not with mutant merlin molecules (NF2 patient mutations) or a merlin splice variant (isoform II) lacking growth-inhibitory activity. These data indicate that merlin may function to maintain normal cytoskeletal organization, and suggest that merlin's influence on cell growth depends on specific cytoskeletal rearrangements.
Original language | English (US) |
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Pages (from-to) | 267-275 |
Number of pages | 9 |
Journal | Human molecular genetics |
Volume | 8 |
Issue number | 2 |
DOIs | |
State | Published - 1999 |
Funding
We appreciate the technical assistance of Drs Alice Gardner and Yujing Zhang during the execution of these experiments. We thank Helen Morrison for insights and suggestions. This work is supported by NIH grant NS35848.
ASJC Scopus subject areas
- Genetics(clinical)
- Genetics
- Molecular Biology