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The B 0 AT2 protein is a product of the SLC6A15 gene belonging to the SLC6 subfamily and has been shown to be a transporter of essential branched-chain amino acids. We aimed to further characterize the B 0 AT2 transporter in CNS, and to use  Slc6a15  knock out (KO) mice to investigate whether B 0 AT2 is important for mediating the anorexigenic effect of leucine. We used the  Slc6a15  KO mice to investigate the role of B 0 AT2 in brain in response to leucine and in particular the effect on food intake.  Slc6a15  KO mice show lower reduction of food intake as well as lower neuronal activation in the ventromedial hypothalamic nucleus (VMH) in response to leucine injections compared to wild type mice. We also used RT-PCR on rat tissues,  in situ  hybridization and immunohistochemistry on mouse CNS tissues to document in detail the distribution of SLC6A15 on gene and protein levels. We showed that B 0 AT2 immunoreactivity is mainly neuronal, including localization in many GABAergic neurons and spinal cord motor neurons. B 0 AT2 immunoreactivity was also found in astrocytes close to ventricles, and co-localized with cytokeratin and diazepam binding inhibitor (DBI) in epithelial cells of the choroid plexus. The data suggest that B 0 AT2 play a role in leucine homeostasis in the brain.

B0AT2 (SLC6A15) Is Localized to Neurons and Astrocytes, and Is Involved in Mediating the Effect of Leucine in the Brain