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Retinoid-binding proteins in plasma and in cells
Annals of the New York Academy of Sciences
|February 27, 1981
Summary
This study details vitamin A transport via retinol-binding protein (RBP) and its cellular uptake. It highlights the roles of intracellular binding proteins like CRBP and CRABP in vitamin A
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Vitamin A is crucial for various physiological processes.
- Retinol-binding protein (RBP) transports retinol (a form of vitamin A) in the plasma.
- Intracellular binding proteins, such as CRBP and CRABP, are involved in vitamin A metabolism within cells.
Purpose of the Study:
- To elucidate the mechanisms of vitamin A mobilization and transport.
- To investigate the roles of plasma and intracellular retinoid-binding proteins.
- To understand the cellular uptake and intracellular handling of vitamin A.
Main Methods:
- Purification and characterization of retinoid-binding proteins (RBP, CRBP, CRABP).
- Investigation of vitamin A mobilization from liver stores.
- Studies on the regulation of RBP production and secretion.
- Exploration of cell surface receptors for RBP.
Main Results:
- Retinol is transported in plasma bound to RBP.
- Liver RBP secretion is regulated and influenced by retinol levels.
- Intracellular proteins CRBP and CRABP bind retinol and retinoic acid, respectively.
- Evidence suggests specific receptors mediate retinol delivery to peripheral tissues.
Conclusions:
- Plasma RBP plays a key role in vitamin A transport.
- Intracellular retinoid-binding proteins likely mediate vitamin A's biological activity.
- Further research is needed to fully understand the cellular mechanisms involved.