Abstract
We investigated the short- and long-term effects of ceftriaxone on glutamate transporter subtype 1 (GLT-1) transporter activity and extracellular glutamate in the rat nucleus accumbens. Repeated ceftriaxone administration (50, 100 or 200 mg/kg, i.p.) produced a dose-dependent reduction in glutamate levels that persisted for 20 days following discontinuation of drug exposure. The ceftriaxone effect was prevented by the GLT-1 transporter inhibitor dihydrokainate (1 μM, intra-accumbal). These results suggest that β-lactam antibiotics produce an enduring reduction in glutamatergic transmission in the brain reward center.


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Acknowledgments
This study was funded by the National Institute on Drug Abuse grants DA025314 (SMR), RC1 DA028153 (SMR) and T32 DA07237-17 (EMU).
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The authors declare that they have no conflict of interest.
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Rasmussen, B.A., Baron, D.A., Kim, J.K. et al. β-Lactam antibiotic produces a sustained reduction in extracellular glutamate in the nucleus accumbens of rats. Amino Acids 40, 761–764 (2011). https://doi.org/10.1007/s00726-010-0589-0
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DOI: https://doi.org/10.1007/s00726-010-0589-0