title: Aberrant striatal dopamine transmitter dynamics in brain-derived neurotrophic factor-deficient mice.
abstract: Brain-derived neurotrophic factor (BDNF) modulates the synaptic transmission of several monoaminergic neuronal systems, including forebrain dopamine-containing neurons. Recent evidence shows a strong correlation between neuropsychiatric disorders and BDNF hypofunction. The aim of the present study was to characterize the effect of low endogenous levels of BDNF on dopamine system function in the caudate-putamen using heterozygous BDNF (BDNF(+/-) ) mice. Apparent extracellular dopamine levels in the caudate-putamen, determined by quantitative microdialysis, were significantly elevated in BDNF(+/-) mice compared with wildtype controls (12 vs. 5 nM, respectively). BDNF(+/-) mice also had a potentiated increase in dopamine levels following potassium (120 mM)-stimulation (10-fold) relative to wildtype controls (6-fold). Slice fast-scan cyclic voltammetry revealed that BDNF(+/-) mice had reductions in both electrically evoked dopamine release and dopamine uptake rates in the caudate-putamen. Superfusion of BDNF led to partial recovery of the electrically stimulated dopamine release response in BDNF(+/-) mice. Conversely, tissue accumulation of L-3,4-dihydroxyphenylalanine, extracellular levels of dopamine metabolites, and spontaneous locomotor activity were unaltered. Together, this study indicates that endogenous BDNF influences dopamine system homeostasis by regulating the release and uptake dynamics of pre-synaptic dopamine transmission.
authors: Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA.
authors: Kelly E
authors: KE
authors: Bosse
authors: Francis K
authors: FK
authors: Maina
authors: Johnna A
authors: JA
authors: Birbeck
authors: Marion M
authors: MM
authors: France
authors: Joseph J P
authors: JJ
authors: Roberts
authors: Michelle L
authors: ML
authors: Colombo
authors: Tiffany A
authors: TA
authors: Mathews
mesh_terms: D015102:3,4-Dihydroxyphenylacetic Acid / Q000378:metabolism; D000818:Animals; D019208:Brain-Derived Neurotrophic Factor / Q000172:deficiency* / Q000494:pharmacology; D002853:Chromatography, Liquid; D003342:Corpus Striatum / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D004298:Dopamine / Q000378:metabolism*; D004558:Electric Stimulation; D055664:Electrochemical Techniques; D045604:Extracellular Fluid / Q000187:drug effects / Q000378:metabolism; D006706:Homeostasis / Q000187:drug effects / Q000235:genetics*; D006719:Homovanillic Acid / Q000378:metabolism; D007980:Levodopa / Q000378:metabolism; D016014:Linear Models; D051379:Mice; D018345:Mice, Knockout; D017551:Microdialysis; D009043:Motor Activity / Q000235:genetics; D011189:Potassium Chloride / Q000494:pharmacology; D013997:Time Factors
chemical_list: D019208:Brain-Derived Neurotrophic Factor; D015102:3,4-Dihydroxyphenylacetic Acid; D007980:Levodopa; D011189:Potassium Chloride; D004298:Dopamine; D006719:Homovanillic Acid