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Stretch-activated ion channels modulate the resting membrane potential during early embryogenesis
1Institute of Experimental Cardiology, Cardiology Research Center of the U.S.S.R., Academy of Medical Sciences, Moscow.
Summary
Stretch-activated ion channels in early fish embryos respond to mechanical stress. Their activity correlates with cell cycle changes, suggesting a role in regulating resting potential during embryogenesis.
Area of Science:
- Cell Biology
- Biophysics
- Developmental Biology
Background:
- Early embryogenesis involves complex cellular processes.
- Ion channels play crucial roles in cell function and development.
- Mechanical forces can influence cellular behavior.
Purpose of the Study:
- To investigate the presence and properties of stretch-activated ion channels in early fish embryos.
- To understand the relationship between these channels and the cell cycle.
Main Methods:
- Patch-clamp technique was employed.
- Experiments were conducted on cleaving freshwater fish embryos (2-256 cells).
- Negative pressure was applied to study channel activation.
Main Results:
- Stretch-activated ion channels were identified in embryonic cell membranes.
- These channels exhibit preferential potassium (K+) selectivity and a conductance of 71 pS.
- Channel activity oscillated with the cell cycle, correlating with resting potential and membrane conductance changes.
Conclusions:
- Stretch-activated ion channels are present and functional in early fish embryogenesis.
- These channels are mechanosensitive and K+-selective.
- Their activity is linked to cell cycle-dependent oscillations in membrane potential and conductance.