Related Experiment Videos
Two subcellular locations for peripheral-type benzodiazepine acceptors in rat liver
G B O'Beirne1, M J Woods, D C Williams
1Department of Biochemistry, Trinity College Dublin, Ireland.
European Journal of Biochemistry
|February 22, 1990
Summary
Researchers identified two types of peripheral-type benzodiazepine acceptors in rat liver cells. One is located on the outer mitochondrial membrane, while the other is non-mitochondrial, offering new insights into drug target localization.
Area of Science:
- Biochemistry
- Cell Biology
- Pharmacology
Background:
- Peripheral-type benzodiazepine acceptors are crucial drug targets.
- Their precise subcellular localization is not fully understood.
Purpose of the Study:
- To elucidate the subcellular localization of peripheral-type benzodiazepine acceptors in rat liver.
- To differentiate between mitochondrial and non-mitochondrial acceptor populations.
Main Methods:
- Subcellular fractionation using differential centrifugation and isopycnic density-gradient centrifugation.
- Enzyme marker analysis and transmission electron microscopy for organelle identification.
- Sonication sensitivity and ligand specificity assays for acceptor characterization.
Main Results:
- Two distinct peaks of peripheral-type benzodiazepine acceptor sites were identified.
- A mitochondrial acceptor (rho = 1.19 g/ml) located on the outer mitochondrial membrane was characterized.
- A non-mitochondrial acceptor (rho = 1.17 g/ml), insensitive to sonication, was localized away from major organelles.
Conclusions:
- Rat liver contains at least two distinct peripheral-type benzodiazepine acceptors.
- One acceptor is associated with mitochondria, while the other resides in a non-mitochondrial compartment.
- These findings provide a basis for understanding the differential roles and targeting of these acceptors.