@ARTICLE{10.3389/fnins.2016.00542, AUTHOR={Devader, Christelle and Moreno, Sébastien and Roulot, Morgane and Deval, Emmanuel and Dix, Thomas and Morales, Carlos R. and Mazella, Jean}, TITLE={Increased Brain Neurotensin and NTSR2 Lead to Weak Nociception in NTSR3/Sortilin Knockout Mice}, JOURNAL={Frontiers in Neuroscience}, VOLUME={10}, YEAR={2016}, URL={https://www.frontiersin.org/articles/10.3389/fnins.2016.00542}, DOI={10.3389/fnins.2016.00542}, ISSN={1662-453X}, ABSTRACT={The neuropeptide neurotensin (NT) elicits numerous pharmacological effects through three different receptors (NTSR1, NTSR2, and NTSR3 also called sortilin). Pharmacological approaches and generation of NTSR1 and NTSR2-deficient mice allowed to determine the NT-induced antipsychotic like behavior, the inhibitory of weak fear memory and the nociceptive signaling in a rat formalin tonic pain model to NTSR1. Conversely, the effects of NT on thermal and tonic nociceptions were mediated by NTSR2. However, the role of NTSR3/sortilin on the neurotensinergic system was not investigated. Here, by using C57Bl/6J mouse model in which the gene coding for NTSR3/sortilin has been inactivated, we observed a modification of the expression of both NTSR2 and NT itself. Quantitative PCR and protein expression using Western blot analyses and AlphaLisa™ technology resulted in the observation that brain NTSR2 as well as brain and blood NT were 2-fold increased in KO mice leading to a resistance of these mice to thermal and chemical pain. These data confirm that NTSR3/sortilin interacts with other NT receptors (i.e., NTSR2) and that its deletion modifies also the affinity of this receptor to NT.} }