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The Dynamics of Aerotaxis in a Simple Eukaryotic Model
Marta Biondo1, Cristina Panuzzo2, Shahzad M Ali2
1Department of Physics, INFN, University of Turin, Turin, Italy.
Frontiers in Cell and Developmental Biology
|December 10, 2021
Summary
Dictyostelium cells exhibit aerotaxis, migrating towards optimal oxygen levels. This oxygen-driven movement, crucial for cellular adaptation, is independent of G protein signaling and involves hydrogen peroxide accumulation.
Area of Science:
- Cell Biology
- Biophysics
- Developmental Biology
Background:
- Oxygen is vital for aerobic organisms, but excess can be harmful, necessitating mechanisms like aerotaxis for cellular survival.
- Tumor growth can create hypoxic regions, promoting metastasis, highlighting the importance of understanding oxygen-guided cell migration.
- A need exists for genetically tractable models to study aerotaxis in higher eukaryotes.
Purpose of the Study:
- To investigate whether Dictyostelium discoideum cells can sense and migrate directionally in response to oxygen gradients.
- To characterize the cellular behaviors and signaling pathways involved in Dictyostelium aerotaxis.
Main Methods:
- Assessing Dictyostelium cell migration under controlled hypoxic conditions and varying oxygen concentrations.
- Analyzing cell arrangement patterns, including the formation of a 'corona' during migration.
- Testing the role of specific signaling pathways and mutants, including chemotaxis mutants and a catalase-deficient strain.
Main Results:
- Both growing and starving Dictyostelium cells migrate directionally towards higher oxygen concentrations under hypoxia.
- Cell clusters form a distinct, migrating 'corona' structure, with less motile, rounded cells in the hypoxic center.
- Aggregation-competent cells exhibit stream or aggregate fragmentation, forming coordinated clusters that move towards oxygen.
- Catalase-deficient and pkbR1 mutants show altered aerotaxis, suggesting a role for hydrogen peroxide accumulation.
- Oxygen-driven migration in Dictyostelium is independent of G protein signaling, unlike chemotaxis.
Conclusions:
- Dictyostelium exhibits aerotaxis, migrating towards optimal oxygen levels, serving as a model for this adaptive behavior.
- Intracellular hydrogen peroxide accumulation appears to facilitate oxygen-guided migration in Dictyostelium, similar to mammalian cells.
- Aerotaxis in Dictyostelium is a G protein-independent process, distinguishing it from chemotaxis.
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