Work

Myosin-1e drives ruffle-edge lamellipodia formation and motility in A549 invasive lung cancer cells

Year: 2025

Type: article

Abstract: Lamellipodia are generally defined as thin, sheet-like cell protrusions that constitute the actin cytoskeleton-based motile apparatus, which promotes the movement of migrating cells. Recently, we identified a novel type of lamellipodia, termed ruffle-edge lamellipodia, which have α-actinin-4 (ACTN4)-enriched multilayer membrane folds at their leading edges in certain invasive cancer cell lines. In this study, the role of unconventional myosin-1e (Myo1E) in ACTN4-enriched ruffle-edge lamellipodia was analyzed using live-cell imaging, immunofluorescence, and scanning electron microscopy. Immunofluorescence microscopy for endogenous Myo1E and live-cell imaging of mApple-Myo1E-expressing cells showed that Myo1E was localized to ACTN4-rich lamellipodia tips in A549 cells. The wound-healing assay and live-cell movies showed that Myo1E small interfering RNA knockdown significantly suppressed cell migration and ruffle-edge lamellipodia formation. Furthermore, scanning electron microscopy demonstrated that Myo1E knockdown significantly reduced ruffle-edge structures. These results suggest that Myo1E may play an important role not only in the motility of ruffle-edge lamellipodia but also in the construction of ruffle-edge structures, which are probably associated with cancer cell invasion and metastasis.

Source: Microscopy

DOI: 10.1093/jmicro/dfaf039

Authors: Haruka Morishita, Katsuhisa Kawai, Ayaka Noda, Youhei Egami, Nobukazu Araki

Institution: Kagawa University

Language: English

Topic: Cellular Mechanics and Interactions

Subfield: Cell Biology

Field: Biochemistry, Genetics and Molecular Biology

Domain: Life Sciences

SDG: Good health and well-being

Open Access status: hybrid

Estimated APC paid: $3,494