GABAergic medium-sized striatal output neurons (SONs) provide the principal output for the neostriatum. In the present study we aimed at elucidating the role of GAT-1 in the developing mouse neostriatum (postnatal day [ P] 7-34). We conclude that in the murine neostriatum GAT-1 operates in a net uptake mode.  

Male Wistar rats were implanted with guide cannulae in the basolateral amygdala and neostriatum. In the neostriatum, the 2 mg/kg dose led to a delayed significant increase in dopamine. administration of 4 mg/kg of PROG was followed by a delayed significant increase in dopamine, both, in the basolateral amygdala and neostriatum, but smaller in magnitude in comparison to the intranasal treatment. This is the first study to demonstrate dopamine-enhancing effects of PROG, not only in the neostriatum, but also in the basolateral amygdala.  

Testosterone was administered intranasally in anesthetized male rats, and its effects on the activity of dopaminergic and serotonergic neurons in the neostriatum and nucleus accumbens were assessed by means of microdialysis and HPLC. In the neostriatum, an increase of dopamine occurred after 2.0 mg/kg. Subcutaneous administration of 8.0 mg/kg testosterone increased dopamine and serotonin in the neostriatum only.  

We assume that functional water transport in the striatum precedes that of the midbrain, thus pointing at an accelerated onset of compartmentalization of brain structures and blood-brain barrier establishment in the neostriatum..  

Neurochemically, the lesions led to sub-total dopamine depletions in the neostriatum, which ranged around 60% in the lateral, and around 40% in the medial neostriatum.  

BACKGROUND: The neostriatum, the mouse homologue of the primate caudate/putamen, is the input nucleus for the basal ganglia, receiving both cortical and dopaminergic input to each of its sub-compartments, the striosomes and matrix. CONCLUSIONS/SIGNIFICANCE: This is the first description of a reversal in the distribution of CSPG associated structures, as well as the emergence and maintenance of PNNs in specific subcompartments of the neostriatum.  

Infusions of MSX-3 into the nucleus accumbens core increased locomotion in haloperidol-treated rats, but there were no effects of infusions into the accumbens shell or ventrolateral neostriatum. In contrast, MSX-3 injected into the ventrolateral neostriatum reduced pimozide-induced tremulous jaw movements.  

BACKGROUND AND PURPOSE: Spiny neurons in the neostriatum are highly vulnerable to ischemia.  

Using HPLC/ED and in vivo microdialysis technique imetit (5 mg/kg, i.p.) but not thioperamide (5 mg/kg, i.p.) was shown to attenuate an L-DOPA-evoked (15 mg/kg, i.p.; carbidopa, 30 min pretreatment) increase in extracellular DA in the neostriatum of 6-OHDA-lesioned rats.  

In addition, local injections of MSX-3 into the ventrolateral neostriatum suppressed pimozide-induced tremulous jaw movements.  

Type 2 was distinguished from type 1 by the presence of TDP-43-ir NCIs in the frontotemporal cortex, hippocampal formation, neostriatum and substantia nigra, and was significantly associated with dementia.  

DARPP-32 (dopamine and cAMP regulated phosphoprotein of Mr 32 kDa) is a cytosolic protein that is selectively enriched in medium spiny neurons in the neostriatum.  

At 12 weeks after birth in vivo microdialysis of the neostriatum was employed to demonstrate that maternal Pb(2+) exposure was without effect on the baseline dopamine (DA) microdialysate concentration as well as amphetamine (AMPH, 1.0mg/kg i.p.)-evoked release of striatal DA.  

Expression of mhtt leads to the selective death of the medium spiny neurons (MSN) in the neostriatum, resulting in the appearance of generalized involuntary movements, the main phenotypic alteration of HD.  

Adenosine A(2A) receptors, the receptors involved in this treatment, are highly expressed in the neostriatum.  

Medium spiny projection neurons (MSNs) are the main neuronal population in the neostriatum.  

In addition, lower fractional anisotropy was detected in the neostriatum and midbrain as well as select temporal and parietal regions.  

To quantify the level of GAL-DA, its metabolite DA-succinate and DA in the prefrontal cortex, neostriatum, and cerebellum, rats were killed 2.0 h after the injection of prodrug.  

Histological analyses show extensive lesions in the hippocampus and neostriatum for all groups with ischemia (SIG, SIG12/24/48/72), which are structures involved in the organization of motor behavior.  

At the same time, bilateral microinjection of SCH23390 into the rat neostriatum at doses of 0.004-1.0 microg did not induce any deterioration in learning of the discriminant CAAR as compared with intact controls, though there was a sharp inhibition of motor activity in the open field test. Bilateral microinjections of the D2 dopamine receptor blocker raclopride into the rat neostriatum at a dose of 0.004 microg produced a marked and long-lasting degradation of learning of the discriminant CAAR. These data lead to the following conclusions: 1) the differences in the effects of systemic and intrastriate administration of SCH23390 appear to be associated with the fact that the behavioral changes seen after systemic administration may be mediated mainly by structures differing from neostriatal D1 receptors, and 2) the D1-mediated effects of the nigrostriatal dopaminergic system on the neostriatum are complex, with activation of motor activity (projection spiny neurons of the direct pathway) and weak modulation of the learning process (large aspiny cholinergic interneurons).  

Rats previously implanted with guide-cannulae in the neostriatum (NS) and nucleus accumbens (NAc) were submitted to microdialysis procedure under urethane anesthesia.  

There are two distinct inhibitory GABAergic circuits in the neostriatum.  

There is solid electron microscopic data demonstrating the existence of dopamine (DA) axon terminals (varicosities) with or without synaptic membrane specializations (junctional complexes) in many parts of the CNS, and notably in neostriatum and nucleus accumbens.  

We review first the studies on the action of endogenous glutamate on the extracellular concentrations of dopamine and GABA in the neostriatum and nucleus accumbens during aging.  

Huntington's disease (HD) is an autosomal dominant inherited neurodegenerative disorder in which the neostriatum degenerates early and most severely, with involvement of other brain regions.  

Fluorescent signals for D1 receptor mRNA were detected in 85-89% of PPTB-immunopositive neurons in the neostriatum, accumbens nucleus and lateral stripe of the striatum, whereas almost no signal for D2 receptor was observed in PPTB-positive striatal neurons.  

The study revealed bilateral activation in the supplementary motor area (SMA), extending into the cingulate gyrus, and in the insulae, extending into the right basal ganglia (neostriatum), as well as activity in the right inferior frontal gyrus (IFG) related to the performance of the rhythm task.  

We immunohistochemically examined the neostriatum from 25 patients with symptomatic and presymptomatic Parkinson's disease (PD) with various degrees of Lewy body pathology, using anti-phosphorylated alpha-synuclein (alphaS) antibody. alphaS immunohistochemistry revealed neuronal and glial cytoplasmic inclusions and neuritic changes in the neostriatum.  

Ten-day treatment with either drug increased dopamine utilization in the neostriatum on P21, whereas 5-day treatment had no effect.  

Corticosterone in plasma and brain-derived neurotrophic factor (BDNF) and nerve growth factor (NGF) in neostriatum and hippocampus were examined after one or four treatments on P11 or P15 (0.5, 1.75, 6.5, or 24 h after first dose).  

Relative to controls, amygdala-lesioned animals displayed hypometabolism in three frontal lobe regions, as well as in the neostriatum and hippocampus.  

Chronic experiments on rats were performed to study the effects of daily administration of the GABA(A) receptor antagonist picrotoxin (2 microg) into the rostral neostriatum in rats.  

Haloperidol-induced c-Fos expression in the lateral part of the neostriatum has been correlated with motor side effects while c-Fos induction in the medial part of the neostriatum and the nucleus accumbens is thought to be associated with the therapeutic effects of the drug. In the current study, pretreatment with L-type Ca(2+) channel blockers suppressed haloperidol-induced c-Fos throughout the neostriatum and the nucleus accumbens at 2 h postinjection. However, elevated c-Fos protein expression was observed only in the lateral part of the neostriatum at 5 h postinjection of haloperidol following pretreatment of L-type Ca(2+) channel blocker compared with rats pretreated with vehicle alone. Infusions of L-type Ca(2+) channel blockers directly into the neostriatum mimicked similar patterns of changes in haloperidol-induced c-Fos expression. Moreover, the expression levels of haloperidol-induced zif 268 and haloperidol-induced phosphorylated CREB and phosphorylated Elk-1 were also substantially elevated for a prolonged period of time in the lateral, but not the medial part of the neostriatum, following blockade of L-type Ca(2+) channels. Collectively, the results suggest that coadministration of L-type Ca(2+) channel blockers affects haloperidol signaling in the lateral part of the neostriatum and may exacerbate the development of acute motor side effects..  

We immunohistochemically examined the neostriatum from 14 cases of classic ALS (cALS), six cases of ALS with dementia (ALS-D), and 20 control subjects. These findings suggest that the neostriatum is also involved in the disease process of ALS with and without dementia..  

[ View All ]