Lipid osmosis, membrane tension, and other mechanochemical driving forces of lipid flow.
Curr Opin Cell Biol
; 88: 102377, 2024 Jun.
Article
de En
| MEDLINE
| ID: mdl-38823338
ABSTRACT
Nonvesicular lipid transport among different membranes or membrane domains plays crucial roles in lipid homeostasis and organelle biogenesis. However, the forces that drive such lipid transport are not well understood. We propose that lipids tend to flow towards the membrane area with a higher membrane protein density in a process termed lipid osmosis. This process lowers the membrane tension in the area, resulting in a membrane tension difference called osmotic membrane tension. We examine the thermodynamic basis and experimental evidence of lipid osmosis and osmotic membrane tension. We predict that lipid osmosis can drive bulk lipid flows between different membrane regions through lipid transfer proteins, scramblases, or similar barriers that selectively pass lipids but not membrane proteins. We also speculate on the biological functions of lipid osmosis. Finally, we explore other driving forces for lipid transfer and describe potential methods and systems to further test our theory.
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Osmose
Limites:
Animals
/
Humans
Langue:
En
Journal:
Curr Opin Cell Biol
Année:
2024
Type de document:
Article