title: Acute methamphetamine administration upregulates NGFI-B mRNA expression in the striatum: co-localization with c-Fos immunoreactivity.
abstract: In this study, the effects of acute methamphetamine administration on expression of the nuclear transcription factor NGFI-B mRNA and its co-localization with c-Fos immunoreactivity in the striatum were evaluated in animals receiving a single dose of methamphetamine (4 mg/kg) given at 2 or 6 h prior to perfusion. All animals received a daily saline injection for 6 days prior to methamphetamine treatment. We have found that, similar to c-fos activation, NGFI-B mRNA levels were significantly increased 2 h after methamphetamine treatment and returned to basal levels 6 h later. Induction of NGFI-B mRNA levels by methamphetamine was highest in central striatum as compared to the dorsomedial distribution pattern observed in control animals. After acute methamphetamine treatment, the distribution pattern of NGFI-B mRNA upregulation was very similar to that of methamphetamine induced c-Fos immunoreactivity. However, co-localization studies with c-Fos immunoreactivity showed that not all NGFI-B-positive cells contained c-Fos after methamphetamine treatment. Forty-five percent of all NGFI-B mRNA expressing neurons contained c-Fos immunoreactivity in the dorsomedial striatum as compared to 60% in central and 35% in ventrolateral striatum. This study provides a detailed description of the differential spatial and temporal modulation of NGFI-B and c-Fos expression in the striatum by acute methamphetamine treatment over time.
authors.affiliation: Cellular Neurophysiology, NIDA/NIH, Baltimore, Maryland 21224, USA. cbackman@intra.nida.nih.gov
authors.forename: Cristina
authors.initials: C
authors.lastname: Bäckman
authors.forename: Marisela
authors.initials: M
authors.lastname: Morales
mesh_terms: D000818:Animals; D003342:Corpus Striatum / Q000187:drug effects* / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000096:biosynthesis* / Q000235:genetics; D018765:Dopamine Uptake Inhibitors / Q000008:administration & dosage; D004334:Drug Administration Schedule; D016762:Genes, fos / Q000187:drug effects* / Q000502:physiology; D007150:Immunohistochemistry; D008297:Male; D008694:Methamphetamine / Q000008:administration & dosage*; D057105:Nuclear Receptor Subfamily 4, Group A, Member 1; D012333:RNA, Messenger / Q000096:biosynthesis*; D051381:Rats; D017207:Rats, Sprague-Dawley; D018160:Receptors, Cytoplasmic and Nuclear; D011987:Receptors, Steroid; D014157:Transcription Factors / Q000096:biosynthesis* / Q000235:genetics
chemical_list: D004268:DNA-Binding Proteins; D018765:Dopamine Uptake Inhibitors; C539820:Nr4a1 protein, rat; D057105:Nuclear Receptor Subfamily 4, Group A, Member 1; D012333:RNA, Messenger; D018160:Receptors, Cytoplasmic and Nuclear; D011987:Receptors, Steroid; D014157:Transcription Factors; D008694:Methamphetamine