Abstract
Previous studies show that (1) two members of fos family transcription factors, c-Fos and FosB, are induced in frontal brain regions by methamphetamine; (2) null mutation of c-Fos exacerbates methamphetamine-induced neurotoxicity; and (3) null mutation of FosB enhances behavioral responses to cocaine. Here we sought a role of FosB in responses to methamphetamine by studying FosB null mutant (−/−) mice. After a 10 mg/kg methamphetamine injection, FosB(−/−) mice were more prone to self-injury. Concomitantly, the intracellular feedback regulators of Sprouty and Rad-Gem-Kir (RGK) family transcripts had lower expression profiles in the frontoparietal cortex and striatum of the FosB(−/−) mice. Three days after administration of four 10 mg/kg methamphetamine injections, the frontoparietal cortex and striatum of FosB(−/−) mice contained more degenerated neurons as determined by Fluoro-Jade B staining. The abundance of the small neutral amino acids, serine, alanine, and glycine, was lower and/or was poorly induced after methamphetamine administration in the frontoparietal cortex and striatum of FosB(−/−) mice. In addition, methamphetamine-treated FosB(−/−) frontoparietal and piriform cortices showed more extravasation of immunoglobulin, which is indicative of blood–brain barrier dysfunction. Methamphetamine-induced hyperthermia, brain dopamine content, and loss of tyrosine hydroxylase immunoreactivity in the striatum, however, were not different between genotypes. These data indicate that FosB is involved in thermoregulation-independent protective functions against methamphetamine neurotoxicity in postsynaptic neurons. Our findings suggest two possible mechanisms of FosB-mediated neuroprotection: one is induction of negative feedback regulation within postsynaptic neurons through Sprouty and RGK. Another is supporting astroglial function such as maintenance of the blood–brain barrier, and metabolism of serine and glycine, which are important glial modulators of nerve cells.
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Acknowledgements
We thank Yoshio Hirabayashi for helpful discussion, Tetsuaki Ara and Taeko Nemoto for technical assistance, and the RIKEN Research Resource Center for maintenance of animals. This research was supported by RIKEN, Grants-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology, Japan (2006–2008 to KOK and KT) and by the Uehara Memorial Foundation (2009 to KOK).
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Kuroda, K., Ornthanalai, V., Kato, T. et al. FosB Null Mutant Mice Show Enhanced Methamphetamine Neurotoxicity: Potential Involvement of FosB in Intracellular Feedback Signaling and Astroglial Function. Neuropsychopharmacol 35, 641–655 (2010). https://doi.org/10.1038/npp.2009.169
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DOI: https://doi.org/10.1038/npp.2009.169
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