| Membrane Fluidity — Biophysical property describing the mobility and organization of lipids and proteins within cellular membranes. Membrane fluidity is influenced by lipid composition, cholesterol content, fatty-acid saturation, temperature, oxidative damage, and membrane-associated proteins, and affects receptor activity, membrane transport, signaling, endocytosis, mitochondrial function, and cellular stress responses.
Typical modulation in cancer: Context-dependent. Cancer cells frequently remodel membrane lipid composition and fluidity to support proliferation, migration, invasion, receptor signaling, and resistance to therapy. Either excessive membrane rigidity or excessive fluidity can disrupt normal cellular function, so no universal anticancer direction should be assigned.
Typical modulation in Alzheimer’s disease: Altered membrane fluidity may contribute to impaired receptor function, synaptic signaling, amyloidogenic processing, oxidative damage, and neuronal membrane dysfunction. Reduced membrane fluidity has been reported in aging and neurodegenerative contexts, although direction can vary by membrane compartment and lipid composition.
Typical interpretation: Membrane fluidity ↑ generally reflects greater lipid mobility and reduced membrane order, whereas membrane fluidity ↓ reflects increased membrane rigidity. Biological significance depends on membrane type, lipid composition, and disease context.
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