Brain-derived neurotrophic factor enhances striatal neuropeptide expression in both the intact and the dopamine-depleted rat striatum.
In order to elucidate the importance of the striatal GABAergic neurones in mediating functional effects of exogenously applied brain-derived neurotrophic factor (BDNF) in the basal ganglia, we performed daily injections of BDNF or vehicle into the dopamine-depleted striatum of unilaterally 6-hydroxydopamine-lesioned rats for 1 week. In situ hybridization revealed that BDNF exacerbated the lesion-induced up-regulation of preproenkephalin (PPE) mRNA, and completely reversed the lesion-induced decrease of preprotachykinin (PPT) mRNA. In contrast, striatal levels of trkB mRNA were not significantly affected by BDNF administration. Up-regulation of PPE and PPT mRNA was also observed in unlesioned BDNF-injected animals. We conclude that exogenously applied BDNF increases neuropeptide mRNA expression in striatal neurones independently of the presence of a dopaminergic innervation.
Department of Medical Cell Research, University of Lund, Sweden.
H
H
Sauer
K
K
Campbell
S J
SJ
Wiegand
R M
RM
Lindsay
A
A
Björklund
D000818:Animals; D019208:Brain-Derived Neurotrophic Factor; D003342:Corpus Striatum / Q000187:drug effects* / Q000378:metabolism; D004298:Dopamine / Q000172:deficiency / Q000378:metabolism*; D004745:Enkephalins / Q000096:biosynthesis* / Q000235:genetics; D005260:Female; D005786:Gene Expression Regulation / Q000187:drug effects*; D017403:In Situ Hybridization; D007267:Injections; D009419:Nerve Tissue Proteins / Q000096:biosynthesis / Q000235:genetics / Q000494:pharmacology*; D016627:Oxidopamine / Q000633:toxicity; D010302:Parkinson Disease, Secondary / Q000139:chemically induced / Q000378:metabolism*; D011498:Protein Precursors / Q000096:biosynthesis* / Q000235:genetics; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D051381:Rats; D017207:Rats, Sprague-Dawley; D020801:Receptor, Ciliary Neurotrophic Factor; D017978:Receptors, Growth Factor / Q000096:biosynthesis / Q000235:genetics; D015320:Tachykinins / Q000096:biosynthesis* / Q000235:genetics
D019208:Brain-Derived Neurotrophic Factor; D004745:Enkephalins; D009419:Nerve Tissue Proteins; D011498:Protein Precursors; D012333:RNA, Messenger; D020801:Receptor, Ciliary Neurotrophic Factor; D017978:Receptors, Growth Factor; D015320:Tachykinins; C044206:preprotachykinin; D016627:Oxidopamine; C033660:preproenkephalin; D004298:Dopamine