Characterization of phalloidin-negative nuclear actin filaments in U2OS cells expressing cytoplasmic actin-EGFP

Akira Nagasaki*, Kaoru Katoh, Masamichi Hoshi, Motomichi Doi, Chikashi Nakamura, Taro Q.P. Uyeda

*この研究の対応する著者

研究成果: Article査読

抄録

Actin is a major structural component of the cytoskeleton in eukaryotic cells, including fungi, plants, and animals, and exists not only in the cytoplasm as cytoskeleton but also in the nucleus. Recently, we developed a novel actin probe, β-actin-EGFP fusion protein, which exhibited similar monomeric to filamentous ratio as that of endogenous actin, in contrast to the widely used EGFP-β-actin fusion protein that over-assembles in cells. Unexpectedly, this novel probe visualized an interconnected meshwork of slightly curved beam-like bundles of actin filaments in the nucleus of U2OS cells. These structures were not labeled with rhodamine phalloidin, Lifeact-EGFP or anti-actin antibodies. In addition, immunofluorescence staining and expression of cofilin-EGFP revealed that this nuclear actin structures contained cofilin. We named these actin filaments as phalloidin-negative intranuclear (PHANIN) actin filaments. Since PHANIN actin filaments could not be detected by general detection methods for actin filaments, we propose that PHANIN actin filaments are different from previously reported nuclear actin structures.

本文言語English
ページ(範囲)317-330
ページ数14
ジャーナルGenes to Cells
27
5
DOI
出版ステータスPublished - 2022 5月

ASJC Scopus subject areas

  • 遺伝学
  • 細胞生物学

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