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Superoxide signalling required for multicellular development of Dictyostelium
Gareth Bloomfield1, Catherine Pears
1Biochemistry Department, Oxford University, South Parks Road, Oxford OX1 3QU, UK. pears@bioch.ox.ac.uk
Journal of Cell Science
|July 4, 2003
Summary
Superoxide, a reactive oxygen species, acts as a signaling molecule in Dictyostelium discoideum development. Inhibiting superoxide formation prevents cell aggregation, suggesting its early evolutionary role in multicellular communication.
Area of Science:
- Cellular biology
- Developmental biology
- Biochemistry
Background:
- Reactive oxygen species (ROS) have known signaling roles in various organisms.
- Bacteria, yeast, mammals, and plants utilize ROS in response to oxidative stress and signaling.
- The role of ROS in early development and multicellular transitions is less understood.
Purpose of the Study:
- To investigate the generation and role of superoxide as a signaling molecule in Dictyostelium discoideum development.
- To determine if superoxide is involved in the transition from unicellular to multicellular life.
Main Methods:
- Studied superoxide generation during Dictyostelium discoideum starvation-induced aggregation.
- Utilized pharmacological scavenging of superoxide.
- Overexpressed the enzyme superoxide dismutase to reduce superoxide levels.
Main Results:
- Superoxide is generated in response to a secreted factor during Dictyostelium discoideum multicellular development.
- Inhibiting superoxide formation, through scavenging or superoxide dismutase overexpression, prevented aggregate formation.
- This demonstrates superoxide's critical role in the developmental signaling pathway.
Conclusions:
- Superoxide functions as a key signaling molecule in the early development of Dictyostelium discoideum.
- This signaling mechanism likely evolved early in multicellular organisms to facilitate intercellular communication.
- The findings suggest a conserved role for ROS in developmental processes across eukaryotes.