Striatal dopamine output is compromised within +/− BDNF mice

• Published in: Synapse (New York, N.Y.) Vol. 43; no. 2; pp. 112 - 117
• Main Authors: Dluzen, Dean E., Anderson, Linda I., McDermott, Janet L., Kucera, Jan, Walro, Jon M.
• Format: Journal Article
• Language: English
• Published: New York John Wiley & Sons, Inc 01.02.2002
• Subjects: Animals; Brain-Derived Neurotrophic Factor - deficiency; Brain-Derived Neurotrophic Factor - genetics; Dopamine - metabolism; Dopamine - secretion; Drug Interactions - physiology; Extracellular Space - drug effects; Extracellular Space - metabolism; Female; Genotype; Male; methamphetamine; Methamphetamine - pharmacology; Mice; Mice, Inbred BALB C; Mice, Knockout; Neostriatum - drug effects; Neostriatum - metabolism; Neostriatum - physiopathology; Neural Pathways - drug effects; Neural Pathways - metabolism; Neural Pathways - physiopathology; neurodegeneration; Neurons - drug effects; Neurons - metabolism; Neurons - secretion; neurotoxicity; nigrostriatal system; Parkinson's disease; Parkinsonian Disorders - genetics; Parkinsonian Disorders - metabolism; Parkinsonian Disorders - physiopathology; Perfusion - methods; Potassium - metabolism; Potassium - pharmacology; Substantia Nigra - drug effects; Substantia Nigra - metabolism; Substantia Nigra - physiopathology
• ISSN: 0887-4476; 1098-2396
• DOI: 10.1002/syn.10027

We reported previously that mice lacking one brain‐derived neurotrophic factor (BDNF) allele demonstrate elevated striatal dopamine (DA) concentrations but impaired behavioral responses involving the nigrostriatal dopaminergic (NSDA) system. To test the hypothesis that these elevated striatal DA concentrations are associated with perturbed NSDA functioning, we compared striatal DA output between heterozygous mutant (+/−) and wild‐type littermate control (+/+) BDNF mice under conditions of an intact NSDA system, as well as following methamphetamine (MA)‐induced neurotoxicity. Basal DA output from superfused CS tissue fragments did not differ between +/+ and +/− BDNF mice. Potassium (K+) stimulated DA outputs from intact striatal fragments of +/+ mice were significantly greater than that of +/− BDNF mice. Following MA treatment, K+ stimulated DA output of +/+ mice was statistically equivalent to +/− BDNF mice. Striatal DA concentrations of +/− BDNF mice were elevated, albeit not significantly, in both intact and MA‐treated mice relative to +/+ mice. Following MA treatment, striatal DA concentrations were significantly decreased for both genotypes; however, the degree of DA depletion was significantly greater in +/+ mice. Analyzed collectively, these data show the differential effects exerted by a BDNF mutation upon striatal DA concentrations and output. Notably, lower striatal DA concentrations of +/+ vs. +/− BDNF mice can be contrasted with the significantly greater K+ stimulated DA output from the former. This difference was abolished following MA treatment. These results suggest that processes involved with the dynamics of DA release within the NSDA system may be compromised in +/− BDNF mutant mice. Synapse 43:112–117, 2002. © 2001 Wiley‐Liss, Inc.