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

• Published in: Nutrition reviews 2024-09
• Main Authors: Wang, Joshua, Moody, Hayley, Beecher, Kate, Chehrehasa, Fatemeh
• Format: Article
• Language: English
• ISSN: 0029-6643; 1753-4887; 1753-4887
• DOI: 10.1093/nutrit/nuae127

The translocator protein of 18 kDa (TSPO) and RIM binding protein 1 (RIM-BP1) are both heavily expressed in neurons at the olfactory bulb. These proteins have overlapping functional profiles and are both implicated in the development of obesity. Over 20 years ago, a yeast 2-hybrid experiment discovered that RIM-BP1 interacts with a peptide constructed from a fraction of the TSPO sequence. Considering these data, the authors predict that the interaction between RIM-BP1 and TSPO could alter the olfactory system's mediation of appetite. Despite the therapeutic potential of this interaction, it has never been confirmed if the full TSPO protein and RIM-BP1 interact. The interaction is instead often cited as physiologically irrelevant. This commentary revisits the forgotten interaction between TSPO and RIM-BP1, reviewing all relevant literature discussing their relationship. Contrary to common discourse that the RIM-BP1 and TSPO are potential binding partners, while the interaction may regulate many neurological functions, existing evidence suggests that the interaction would have a specific role in odor-guided appetite. Further research into the nutritional neuroscientific consequences of TSPO/RIM-BP1 interactions should therefore be conducted.