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Giant membrane vesicles as a model to study cellular substrate uptake dissected from metabolism
D P Y Koonen1, W A Coumans, Y Arumugam
1Department of Physiology, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, the Netherlands. d.koonen@fys.unimaas.nl
Molecular and Cellular Biochemistry
|December 14, 2002
Summary
Giant vesicles derived from parenchymal cells, not endothelial cells, are suitable for studying substrate uptake in metabolic tissues. These vesicles lack organelles, enabling metabolism-independent flux analysis.
Area of Science:
- Cell Biology
- Biochemistry
- Physiology
Background:
- Giant vesicles are crucial for studying substrate uptake in metabolically active tissues.
- Understanding the cellular origin and composition of giant vesicles is essential for accurate metabolic studies.
Purpose of the Study:
- To characterize giant vesicles isolated from heart, liver, skeletal muscle, and adipose tissue.
- To identify the cell types and plasma membrane regions involved in giant vesicle formation.
- To examine the presence of transporters for metabolic substrates within these vesicles.
Main Methods:
- Isolation of giant vesicles from various metabolically important tissues.
- Analysis using cell-type specific markers and plasma membrane domain markers.
- Investigation of KCl-induced alterations in recycling processes.
Main Results:
- Giant vesicles originate from parenchymal cell plasma membranes, excluding endothelial cells.
- Plasma membrane regions enriched in caveolae and involved in endosomal recycling are retained.
- Vesicles contain cytoplasmic soluble constituents, including fatty-acid binding proteins, and lack subcellular organelles.
- Isolated vesicles are uniform in size (10-15 µm) and shape.
Conclusions:
- Giant vesicles from parenchymal cells are a viable model for substrate uptake studies.
- The absence of intracellular metabolism in these vesicles allows for precise flux measurements.
- These vesicles offer a unique tool for investigating substrate transport dynamics across different organs.