Rediscovering a Forgotten Link: TSPO and RIM-BP1 in Appetite Regulation.

This article focuses on the potential interaction between the translocator protein of 18 kDa (TSPO) and rab3-interacting molecule binding protein 1 (RIM-BP1), both highly expressed in neurons of the olfactory bulb and implicated in appetite regulation. Although a yeast two-hybrid study over 20 years ago suggested that a TSPO peptide fragment interacts with RIM-BP1, the interaction between the full TSPO protein and RIM-BP1 remains unconfirmed and often dismissed. The authors review evidence challenging previous reasons for skepticism, highlighting overlapping neuronal expression and functional roles of TSPO and RIM-BP1, and propose that their interaction may influence odor-guided appetite by modulating synaptic efficiency and neurosteroid-mediated GABAergic signaling. They recommend further research into TSPO/RIM-BP1 interactions as a potential therapeutic target for obesity and eating disorders.