Summary of ssbd-repos-000452

Name
URL
DOI

Title
Intracellular signaling observed using giant Dictyostelium cells
Description

We developed a method to enlarge Dictyostelium discoideum cells by partial cytokinesis inhibition, generating multinucleated yet functional giant cells. These cells retained chemotactic signaling, polarity, and motility, enabling high-resolution live-cell imaging. Using fluorescent probes for cAMP and Ca2+, we uncovered a directional, front-to-rear propagation of cAMP signaling and a biphasic Ca2+ response coordinated with actin wave dynamics.

Submited Date
2025-07-07
Release Date
2026-01-21
Updated Date
-
License
Funding information
Japan Science and Technology Agency, JPMJSP2154, JPMJPR204B
File formats
TIFF
Data size
4.6 GB

Organism
Dictyostelium discoideum
Strain
Dictyostelium discoideum, AX2
Cell Line
-
Genes
-
Proteins
Flamindo2, GCaMP6s, F-actin, PH-domain

GO Molecular Function (MF)
-
GO Biological Process (BP)
cell migration
GO Cellular Component (CC)
cell, cytoplasm
Study Type
Chemotaxis, Cell polarity, Cell migration
Imaging Methods
spinning disk confocal microscopy

Method Summary

See details in Hayashida, et. al. (2025) bioRxiv.

Related paper(s)

Hayashida, Yukihisa, Gomibuchi, Yuki, Oosawa, Chikoo, Yasunaga, Takuo, Morimoto, Yusuke V. (2026) Establishing functional giant Dictyostelium cells reveals front–rear polarity in intracellular signaling, Communications Biology, Volume 9, Number 1, 71

Published in Jan. 21, 2026

(Abstract) Intracellular signaling dynamics are often obscured by the spatial and temporal limitations of cell size. Here, we developed a method to enlarge Dictyostelium discoideum cells by partial cytokinesis inhibition, generating multinucleated yet functional giant cells. These cells retained chemotactic signaling, polarity, and motility, enabling high-resolution live-cell imaging. Using fluorescent probes for cAMP and Ca2+, we uncovered a directional, front-to-rear propagation of cAMP signaling and a biphasic Ca2+ response coordinated with actin wave dynamics. Grid-based mapping revealed asymmetric cAMP synthesis and decay kinetics, and vesicle localization suggested spatially regulated cAMP secretion. Our findings demonstrate that intracellular signaling involves self-organized, spatially structured propagation events aligned with cellular polarity. The giant cell platform offers a powerful and generalizable strategy for dissecting the spatiotemporal logic of single-cell signaling.
Related paper(s)

Hayashida, Yukihisa, Gomibuchi, Yuki, Oosawa, Chikoo, Yasunaga, Takuo, Morimoto, Yusuke V. (2025/01/01), Front–rear polarity of intracellular signaling uncovered via giant <em>Dictyostelium</em> cells, bioRxiv, 2025.06.30.662253

Published in 2025/01/01

(Abstract) None

Contact(s)
Yusuke V. Morimoto
Organization(s)
Kyushu Institute of Technology , Department of Physics and Information Technology, Faculty of Computer Science and Systems Engineering
Image Data Contributors
Quantitative Data Contributors

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