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Mechanisms sensing and modulating signals arising from cell swelling
Martin Jakab1, Johannes Fürst, Martin Gschwentner
1Institute of Physiology, University of Innsbruck, Austria.
Summary
Cells counteract swelling by releasing osmolytes, a process called regulatory volume decrease (RVD). However, the exact intracellular mechanisms sensing volume changes and activating RVD remain incompletely understood across different cell types.
Area of Science:
- Cell Biology
- Physiology
- Biochemistry
Background:
- Cell volume regulation is crucial for cellular functions like transport, metabolism, and apoptosis.
- Cells must counteract osmotic swelling to prevent damage.
- Regulatory volume decrease (RVD) is a key defense mechanism against cell swelling.
Purpose of the Study:
- To review the complex intracellular mechanisms of cell volume sensing.
- To elucidate the signaling pathways involved in activating regulatory volume decrease (RVD).
- To highlight cell type- and tissue-specific variations in RVD pathways.
Main Methods:
- Literature review of experimental data on cell volume regulation.
- Analysis of molecular rearrangements and interactions during cell swelling.
- Examination of intracellular messengers and signaling cascades.
Main Results:
- Cell swelling triggers defense mechanisms involving osmolyte release or synthesis.
- Sensing cell volume perturbations and activating RVD involves complex molecular signaling.
- Pathways include calcium, phosphoinositides, inositolphosphates, phosphorylation, and cytoskeletal changes.
- Significant cell type- and tissue-specific variations exist in RVD pathways.
Conclusions:
- Intracellular mechanisms for sensing cell volume and activating RVD are not fully understood.
- Diverse signaling pathways converge on common effectors for osmolyte extrusion.
- Further research is needed to define common sensing and signaling pathways for cell volume readjustment.