Sharp, localized phase transitions in single neuronal cells
Carina S Fedosejevs1, Matthias F Schneider1
1Department of Medical and Biological Physics, Technical University Dortmund, 44227 Dortmund, Germany carina.fedosejevs@tu-dortmund.de matthias-f.schneider@tu-dortmund.de.
Summary
Single human neuronal cells exhibit optical characteristics of a phase transition within their membranes, crucial for cell functions. This reversible process, influenced by temperature and pH, impacts cell properties.
Area of Science:
- Cell biology
- Biophysics
- Neuroscience
Background:
- Nonlinear cellular responses are vital for functions like nerve impulse propagation.
- Nonlinear behavior in physics often stems from phase transitions.
- Evidence for single-cell phase transitions has been lacking, hindering biological research.
Purpose of the Study:
- To investigate the presence and characteristics of phase transitions in single human neuronal cells.
- To explore the biophysical underpinnings of nonlinear cellular responses.
Main Methods:
- Optical analysis of single cells from a human neuronal cell line.
- Thermodynamic modeling to understand transition triggers.
- Assessment of cell property changes post-transition.
Main Results:
- Single neuronal cells display optical signatures of a sharp, nonlinear phase transition in their membranes.
- The observed transition is reversible and not due to protein denaturation.
- Temperature and pH were identified as triggers, with potential induction by calcium or mechanical stress.
Conclusions:
- Cellular membranes can undergo phase transitions, explaining nonlinear responses.
- These transitions significantly alter cell permeability, enzyme activity, and physical properties.
- Findings bridge physics concepts of phase transitions to cellular biophysics and function.
