Abstract
The mitochondrial 18 kDa Translocator Protein (TSPO) was first detected by its capability to bind benzodiazepines in peripheral tissues and later also in glial cells in the brain, hence its previous most common name peripheral benzodiazepine receptor (PBR). TSPO has been implicated in various functions, including apoptosis and steroidogenesis, among others. Various endogenous TSPO ligands have been proposed, for example: Diazepam Binding Inhibitor (DBI), triakontatetraneuropeptide (TTN), phospholipase A2 (PLA2), and protoporphyrin IX. However, the functional implications of interactions between the TSPO and its putative endogenous ligands still have to be firmly established. The TSPO has been suggested to interact with a mitochondrial protein complex, summarized as mitochondrial membrane permeability transition pore (MPTP), which is considered to regulate the mitochondrial membrane potential (ΔΨm). In addition, the TSPO is associated with several other proteins. The associations of the TSPO with these various proteins at the mitochondrial membranes have been attributed to functions such as apoptosis, steroidogenesis, phosphorylation, reactive oxygen species (ROS) generation, ATP production, and collapse of the ΔΨm. Interestingl...Continue Reading
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