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PubMed2001

Ictal hyperperfusion of cerebellum and basal ganglia in temporal lobe epilepsy: SPECT subtraction with MRI coregistration.

UNLABELLED: The ictal hyperperfusion (compared with the interictal state) of the cerebellum and basal ganglia has not been investigated systematically in patients with temporal lobe epilepsy (TLE). Their ictal perfusion patterns were analyzed in relation to temporal and frontal hyperperfusion during TLE seizures using SPECT subtraction. METHODS: Thirty-three TLE patients had interictal and ictal SPECT, video-electroencephalographic (EEG) monitoring, and volumetric MRI. SPECT subtraction with MRI coregistration was performed using commercial software. The presence of ictal hyperperfusion was determined in the ipsilateral and contralateral temporal lobe, frontal lobe, cerebellum, and basal ganglia. RESULTS: All patients showed ictal hyperperfusion in the temporal lobe of seizure origin. Vermian cerebellar hyperperfusion (CH) was observed in 26 patients (78.8%) and hemispheric CH was found in 25 (75.8%). Compared with the side of the epileptogenic temporal lobe, there were 7 patients with ipsilateral hemispheric CH (28.0%), 15 with contralateral hemispheric CH (60.0%), and 3 with bilateral hemispheric CH (12.0%). CH was observed more frequently in patients with additional frontal hyperperfusion (14/15, 93.3%; 2 ipsilateral to the seizure focus, 10 contralateral, and 2 bilateral) than in patients without frontal hyperperfusion (11/18, 61.1%). Among 18 patients with temporal hyperperfusion without frontal hyperperfusion, 11 patients showed hemispheric CH (5 ipsilateral to seizure focus, 5 contralateral, 1 bilateral). Hyperperfusion in the basal ganglia (BGH) was seen in 11 of the 15 patients with temporal and frontal hyperperfusion (73.3%) and in 11 of the 18 with only temporal hyperperfusion (61.1%). In 17 patients with unilateral BGH (13 ipsilateral to the seizure focus, 4 contralateral), CH contralateral to the BGH was observed in 14 (82.5%), CH ipsilateral to the BGH was found in 2 (11.8%), and CH bilateral to the BGH was found in 1 (5.9%). CONCLUSION: During TLE seizures, hemispheric CH occurred not only in contralateral but also in ipsilateral or bilateral cerebellar hemispheres to the side of seizure origin. Although temporal lobe origin seizures associated with additional frontal hyperperfusion produced more frequent hemispheric CH, seizures showing only temporal hyperperfusion without frontal hyperperfusion could produce BGH and CH. To determine the side of hemispheric CH, the most important factor appears to be the side of BGH, not the side of seizure origin.

Adolescent↗
PubMedDate not supplied

Selective release of glutamine and glutamic acid produced by perfusion of GLP-1 (7-36) amide in the basal ganglia of the conscious rat.

Glucagon-like peptide 1 (GLP-1)(7-36) amide, a member of the family of glucagon and related peptides, synthesized by intestinal L cells, has a well-defined distribution in rat brain. In addition, specific GLP-1(7-36) amide receptors have also been localized in some regions of the brain, which suggests that this novel gut-brain peptide has a role in brain function. Accordingly, we investigated the effects of this peptide on the release of amino acid neurotransmitters in the basal ganglia of conscious rats after its perfusion through a concentric "push-pull" cannula system with an artificial cerebrospinal fluid. To obtain stable basal levels of amino acids, the basal ganglia were perfused with an artificial cerebrospinal fluid for 2 h at a flow rate of 20 microliters/min and then with GLP-1(7-36) amide for 10 min, followed by 40 min poststimulation perfusion. GLP-1(7-36) amide produced an immediate increase (p less than 0.01) of the extracellular levels of glutamine and glutamic acid in the basal ganglia. By contrast, this peptide has no effect on the levels of aspartic acid, glycine, and serine. Because glutamine is a metabolic precursor of glutamic acid and is synthesized almost exclusively in astrocytes, these findings suggest a stimulatory effect of GLP-1(7-36) amide on astrocytes and/or neurons of the rat basal ganglia.

Animals↗
PubMed1986

AIDS: calcification of the basal ganglia in infants and children.

CT or postmortem examination demonstrated calcification of the basal ganglia in eight infants and children with acquired immune deficiency syndrome. Serial CT studies documented progression of both bilateral symmetric calcium densities and cerebral atrophy. Clinical features included progressive encephalopathy with dementia, and pyramidal tract signs. Postmortem examination of four children revealed variable degrees of calcific vasopathy of the basal ganglia, involving predominantly the putamen and globus pallidus.

Acquired Immunodeficiency Syndrome↗
PubMed2001

Basal ganglia metabolite abnormalities in minor motor disorders associated with human immunodeficiency virus type 1.

BACKGROUND: Minor motor disorders (MMDs) associated with human immunodeficiency virus type 1 (HIV-1) predict HIV-1 dementia and death. Little is known about the time course and neuropathologic mechanisms of HIV-1 MMDs. OBJECTIVE: To investigate the relationship between HIV-1 MMDs, as assessed by psychomotor speed, and metabolic alterations in the basal ganglia, as detected by proton magnetic resonance spectroscopy. PATIENTS AND METHODS: A total of 32 HIV-1-seropositive patients (10 with no MMD, 8 with incipient MMD, and 14 with sustained MMD, assessed through electrophysiologic testing of psychomotor speed including contraction times; 29 treated with highly active antiretroviral therapy) and 14 HIV-1-seronegative control subjects were examined for cerebral metabolite abnormalities in the basal ganglia by means of magnetic resonance spectroscopy. RESULTS: The 3 patient groups showed significantly different ratios of myoinositol/creatine (P =.02) in the basal ganglia. Whereas patients with no MMD or incipient MMD showed normal ratios, patients with sustained MMD showed higher values for myoinositol/creatine as a sign of glial proliferation. No differences in N-acetyl compounds, indicative of neuronal loss, were found. CONCLUSION: Whereas metabolic alterations in the basal ganglia were not detected in patients with incipient HIV-1 MMD, patients with sustained HIV-1 MMD did have significantly altered metabolic spectra indicative of glial proliferation.

AIDS Dementia Complex↗
PubMed2003

Membrane phospholipid abnormalities of basal ganglia in never-treated schizophrenia: a 31P magnetic resonance spectroscopy study.

BACKGROUND: Studies in schizophrenia using in vivo (31)P magnetic resonance spectroscopy (MRS) have mostly focused on the association cortices, including the frontal and temporal lobes. Striatum has also been implicated in schizophrenia, although neuroleptic exposure in the patients is a potential confound limiting interpretation of earlier studies. We examined membrane phospholipid abnormality in the basal ganglia using (31)P MRS in neuroleptic-naive schizophrenia patients. METHODS: Never-treated, DSM-IV schizophrenia patients (n=20) and age- and gender-matched healthy control subjects (n=30) underwent in vivo 1-D 31P MRS of both basal ganglia using an image-selected technique on a 1.5-T magnetic resonance imaging scanner. A neuroradiologist blind to clinical data measured the phosphomonoester (PME) and phosphodiester (PDE) from the spectra. RESULTS: The schizophrenia patients showed significantly and bilaterally elevated levels of PME/PDE ratios in basal ganglia as compared with control subjects. There were no significant differences in the ratios between the two sides in either patient or control groups. Phosphomonoester/phosphodiester ratio did not correlate with illness duration. Lower Positive and Negative Syndrome Scale scores were associated with lower PME/PDE ratio. CONCLUSIONS: The basal ganglia of never-treated schizophrenia patients show features suggestive of reduced breakdown and/or increased synthesis of membrane phospholipids. Lack of correlation between illness duration and the membrane phosphorus moiety ratio may be consistent with a nonprogressive, possibly neurodevelopmental etiopathogenesis.

Adult↗
PubMed1981

Basal ganglia calcification in pseudohypoparathyroidism type II.

The case history of a patient with basal ganglia calcifications found by computerised tomography is presented. Calcium and phosphorus metabolism showed a pattern suggesting lack of parathyroid hormone (PTH). Further studies revealed increased endogenous PTH levels and urinary cAMP excretion. However, endogenous and exogenous PTH could not elicit the cAMP-mediated phosphaturic response, indicating pseudohypoparathyroidism type II. The responses of prolactin to TRH and chlorpromazine was impaired. Basal ganglia calcification in pseudohypoparathyroidism type II may represent the only somatic abnormality in this disease apart from the biochemical abnormalities.

Adolescent↗
PubMed1975

Morphology of the basal ganglia in Parkinson's disease.

This work consists in part of volume measurements for the caudate nucleus, putamen and pallidum; and in part of a determination of cell-distribution and cell density in the corpus striatum from 9 paralysis agitans patients and 15 control persons from the Institute of Forensic Medicine. All 24 brains were sectioned on a specially constructed apparatus. For each of the individual sections, the size of the basal ganglia was determined by measurements of the section thickness with a capillary tube and area measurements were made by microscopic projection method combined with planimetric methods. For the first six control brains, the area measurements were also taken using point-counting method. The values thus obtained were used in the basic formula for a truncated cone and the volume of the basal ganglia for the individual hemispheres was calculated. The only exception was a single hemisphere where the volume of the basal ganglia was determined after dissecting out and weighing these structures. The results showed that the volume measurements of the corpus striatum and the pallidum in these two groups of brains were quite similar, when differences due to body height, age, and brain weight were taken into account. The volume of the basal ganglia decreased with age in both groups of brains and increased with brain weight. The shrinkage of the tissue as a consequence of the histological procedures was also determined. The shrinkage from fresh to formalin-fixed condition was determined by comparing the distance between the same two marked points in the fresh and formalin-fixed tissue. The shrinkage from the formalin-fixed condition to the completed histological preparation was determined by comparing the distance between known structural characteristics, as measured on photographs showing the formalin-fixed sections, lying beside a millimeter scale, with the same distance on the histologically treated preparations. The accumulated shrinkage in volume was 47.3%.

Adult↗
PubMed1996

Basal ganglia and thalamic infarction in children. Cause and clinical features.

BACKGROUND: We present the signs, symptoms, and radiographic features of 36 children with ischemic infarctions of the basal ganglia, internal capsule, or thalamus. PATIENTS AND METHODS: The series includes 14 males and 22 females ranging in age from newborn to 13 years. Twenty-seven patients were evaluated with computed tomography, 34 with magnetic resonance imaging, 16 with magnetic resonance angiography, and 10 with conventional cerebral angiography. Thirty patients had unilateral lesions (16 left, 14 right) and 6 had bilateral infarctions. RESULTS: The most common presenting symptom was hemiplegia (30 of 36). Other children presented with aphasia (5 of 36), seizures (5 of 36), altered consciousness (5 of 36), and hemisensory changes (5 of 36). Four of 6 patients with bilateral lesions presented with altered mental status, but the location of a unilateral infarction within the thalamus or basal ganglia did not predict the clinical presentation. CONCLUSIONS: The risk factors for basal ganglia infarction in children are diverse, but systemic hypertension does not play a major role in children. The vascular occlusion often occurred in the large arteries, with secondary occlusion of the smaller penetrating arteries. Most children with a single unilateral infarction have a good prognosis.

Adolescent↗
PubMed1991

Alterations in the levels of iron, ferritin and other trace metals in Parkinson's disease and other neurodegenerative diseases affecting the basal ganglia.

Levels of iron, copper, zinc and manganese were measured by inductively coupled plasma spectroscopy in frozen postmortem brain tissue from patients with Parkinson's disease (PD), progressive supranuclear palsy (PSP), multiple system atrophy with strionigral degeneration (MSA), and Huntington's disease (HD) compared with control subjects. Total iron levels were found to be elevated in the areas of basal ganglia showing pathological change in these disorders. In particular, total iron content was increased in substantia nigra in PD, PSP and MSA, but not in HD. Total iron levels in the striatum (putamen and/or caudate nucleus) were increased in PSP, MSA and HD but not in PD. Total iron levels were decreased in the globus pallidus in PD. There were no consistent alterations of manganese levels in basal ganglia structures in any of the diseases studied. Copper levels were decreased in the substantia nigra in PD, and in the cerebellum in PSP, and were elevated in the putamen and possibly substantia nigra in HD. Zinc levels were only increased in PD, in substantia nigra and in caudate nucleus and lateral putamen. Levels of the iron binding protein ferritin were measured in the same patient groups using a radio-immunoassay technique. Increased iron levels in basal ganglia were generally associated with normal or elevated levels of ferritin immunoreactivity, for example, the substantia nigra in PSP and possibly MSA, and in putamen in MSA. The exception was PD where there was a generalized reduction in brain ferritin immunoreactivity, even in the substantia nigra. An increase in total iron content appears to be a response to neurodegeneration in affected basal ganglia regions in a number of movement disorders. However, only in PD was there an increased total iron level, decreased ferritin content, decreased copper content, and an increased zinc concentration in substantia nigra. These findings suggest an alteration of iron handling in the substantia nigra in PD. Depending on the form in which the excess iron load exists in nigra in PD, it may contribute to the neurodegenerative process.

Aging↗
PubMed2006

The role of the basal ganglia in the control of automatic visuospatial attention.

Cognitive impairments in patients with basal ganglia dysfunction are primarily revealed where performance relies on internal, voluntary control processes. Evidence suggests that this also extends to impaired control of more automatic processes, including visuospatial attention. The present study used a non-predictive peripheral cueing paradigm to compare and contrast visuospatial deficits in patients with Parkinson's disease (PD) with those previously revealed in patients with Huntington's disease (HD) (Fielding et al., 2006a). Compared to age-matched controls, both PD and HD patients exhibited increased distractibility or poor fixation, however only PD patients responded erroneously to cue stimuli more frequently than control subjects. All subjects demonstrated initial facilitation for valid versus invalid cues following the shorter stimulus-onset asynchronies (SOAs) and a performance decrement at the longer SOAs (inhibition of return), although there was a clear differentiation between these groups for immediate SOAs. Unlike both control and PD subjects, where IOR manifested between 350 and 1000 msec, IOR was evident as early as 150 msec for HD patients. Further, for PD patients, spatially valid cues resulted in hyper-reflexivity following 150 msec SOAs, with saccadic latencies shorter than those generated in response to un-cued targets. Thus contrasting deficits were revealed in PD and HD, emphasizing the important contribution of the basal ganglia in the control of more automatic behaviors

Aged↗
PubMed1986

Polysomnography--functional topographical examination of the basal ganglia.

Polysomnographical examinations were performed on two cases with unilateral lesion in the basal ganglia. One (case 1) was a 10-year-old girl with tuberous sclerosis with subependymal nodules on the left thalamostriatal sulcus and rotatory seizures, and pharmacologically the existence of a postsynaptic supersensitivity of the dopaminergic (DA) neurons, was suggested. The other (case 2) was an 8-year-old boy with infarction of the left putamen. Two types of body movements (BMs); gross movements (GM) and twitch movements (TM), were evaluated. The mode of occurrence of these BMs against each sleep stage, the pattern of BMs, and the ratio of the number of TM in the mentalis muscle in stage REM against the number of rapid eye movements (REMs) (ment TM REM/REMs) were estimated. The modulation of these parameters by L-Dopa and pimozide was studied. The pattern of GM reflected the DA activity of the side of the lesion. TM of the contralateral side reflected the pathophysiology of the lesion. TM of the ipsilateral extremities of case 1 showed the pattern of DA hyperactivity, which were reduced by small doses of L-Dopa. In case 2, TM of the ipsilateral extremities showed a normal pattern and rate, which increased markedly after L-Dopa. The TM of the sternocleidomastoideus revealed abnormal ipsilaterally in case 1 and contralaterally in case 2. The ment TM REM/REMs ratio reflected the real function of the DA neurons and did not reflect their hyperfunction due to postsynaptic supersensitivity. The numbers and direction of REMs might reflect the function of the basal ganglia, particularly of the DA neurons.

Basal Ganglia↗
PubMed2000

Role of basal ganglia and ectostriatum in the context-dependent properties of the optocollic reflex (OCR) in the pigeon (Columba livia): a lesion study.

The possible participation of basal ganglia and associated structures [dorsal striato-pallidum, nucleus spiriformis lateralis (SpL), ectostriatum] in the elaboration of the optocollic reflex (OCR) was investigated by making bilateral chemical lesions (ibotenic acid). Previous data have shown that both the slow and fast phases of the OCR are dependent on the behavioural context. The slow phase velocity (SPV) and the peak velocity of fast phases obtained in non-flying pigeons ('resting condition') were enhanced in pigeons in which a flying posture was experimentally provoked ('flying condition'). Therefore, the effect of lesions was analysed in pigeons standing in the 'resting' or 'flying' condition. In the 'resting' as in the 'flying' condition, all the lesions provoked a decrease in SPV, which augmented with the stimulation velocity. Velocity step stimuli revealed greater OCR deficits than velocity ramp stimuli. Extensive lesions (including the striato-pallidum, ectostriatum and a part of the neostriatum), as well as SpL lesions, provoked a greater SPV decrease over a longer time than lesions restricted to the striato-pallidum or the ectostriatum. The peak velocity of fast phases was only reduced by the 'extensive lesion' in the 'flying condition'. The present data show that the basal ganglia system is involved in the elaboration of optokinetic responses and suggest that, to work in an optimal range, the optokinetic centres need to receive integrated information from basal ganglia in addition to direct visual input.

Animals↗
PubMed2003

Basal ganglia neuronal discharge in primary and secondary dystonia in patients undergoing pallidotomy.

OBJECTIVE: Basal ganglia neuronal activity in patients undergoing posteroventral pallidotomy (PVP) for the treatment of primary genetic, secondary, or idiopathic dystonia (DYS) was studied to gain a better understanding of the pathophysiology of DYS. METHODS: Intraoperative neurophysiological data recorded from 15 DYS patients were compared with those from 78 patients with Parkinson's disease (PD) who underwent PVP. RESULTS: Putamen neurons in both DYS and PD patients had low discharge rates. Globus pallidus externa (GPe) and globus pallidus interna (GPi) neurons in DYS patients had significantly lower discharge rates and more irregular discharge patterns than in PD patients. GPe and GPi neurons displayed similar discharge rates and patterns in DYS, whereas in PD, the discharge rate of GPe neurons was lower than that of the GPi neurons. The discharge rate and pattern of GPe and GPi neurons in patients whose DYS was ameliorated by PVP were similar to those in DYS patients who did not benefit from PVP. No significant differences in the rate or pattern of neuronal discharge in patients with DYS of different causes were discernible. PVP was most beneficial in patients with primary genetic DYS. Anesthesia with desflurane depressed the discharge rate of the GPe and GPi neurons, particularly in patients with PD. CONCLUSION: Significant differences in the rates and patterns of discharge of GPe and GPi neurons exist in DYS and PD. The findings are discussed with reference to the current model of the functional connections of the basal ganglia.

Adolescent↗
PubMed1987

Basal ganglia and cerebral cortical distribution of dopamine D1- and D2-receptors in neonatal and adult cat brain.

Quantitative receptor autoradiography was performed on neonatal and adult cat brains. Serial sections through the basal ganglia were assayed for D1- and D2-dopamine receptors and acetylcholinesterase (AChE) staining. The neonatal basal ganglia revealed patches of increased D1-receptor density that frequently overlapped with patches of increased AChE staining, while the D2-receptor distribution was more homogeneous. The adult basal ganglia revealed a mild amount of heterogeneity for both the D1- and D2-receptors, varying from 10 to 25%, with little correspondence to the marked heterogeneity seen with AChE staining. A distinct laminar distribution of the D1-receptor, without significant D2 binding, was seen in the cerebral cortex.

Acetylcholinesterase↗
PubMed1998

MRI of germinomas arising from the basal ganglia and thalamus.

We reviewed the MRI findings of germinomas originating from the basal ganglia, thalamus or deep white matter in 13 patients with 14 germinomas, excluding those in the suprasellar or pineal regions. Ten cases were confirmed as germinomas by stereotaxic biopsy, three by partial and one by total removal of the tumour. Analysis was focussed on the location and the signal characteristic of the tumour, haemorrhage, cysts within the tumour and any other associated findings. Thirteen of the tumours were in the basal ganglia and one in the thalamus. Haemorrhage was observed in seven patients, while twelve showed multiple cysts. Associated ipsilateral cerebral hemiatrophy was seen in three patients. The signal intensity of the parenchymal germinomas was heterogeneous on T1- and T2-weighted images due to haemorrhage, cysts and solid portions. We also report the MRI findings of germinomas in an early stage in two patients.

Adolescent↗
PubMed1998

Intrastriatal mesencephalic grafts affect neuronal activity in basal ganglia nuclei and their target structures in a rat model of Parkinson's disease.

Nigrostriatal dopamine (DA) lesions lead to changes of neuronal activity in basal ganglia nuclei such as the globus pallidus (GP, the rodent homolog of lateral globus pallidus), entopeduncular nucleus (EP, the rodent homolog of medial globus pallidus), substantia nigra pars reticulata (SNR), and subthalamic nucleus (STN). We investigated in rats whether embryonic mesencephalic DA neurons grafted in the striatum may affect the lesion-induced alterations of neuronal activity in these structures. Regional neuronal activity was determined by use of quantitative cytochrome oxidase histochemistry. It was also examined in lesioned rats whether the grafts may regulate the expression of c-Fos after systemic administration of apomorphine in the basal ganglia nuclei as well as their target structures, including the ventromedial thalamic nucleus (VM), superior colliculus (SC), and pedunculopontine nucleus (PPN). Lesioned rats exhibited an increased activity of CO in the GP, EP, SNR, and STN ipsilateral to the lesion. Intrastriatal nigral grafts reversed the increases in the CO activity in the EP and SNR, whereas the grafts failed to affect the enzyme activity in the GP or STN. Apomorphine induced an increased expression of c-Fos in the GP, STN, VM, SC, and PPN on the lesioned side. The enhanced expression of this protein in all the structures except for the STN was attenuated by nigral grafts. The present results indicate that intrastriatal DA neuron grafts can normalize the lesion-induced changes of neuronal activity in the output nuclei of the basal ganglia as well as their target structures.

Animals↗
PubMed1988

Echogenic vasculature in the basal ganglia of neonates: a sonographic sign of vasculopathy.

The vessels that supply the basal ganglia and thalami are not normally conspicuous on the cranial sonograms of neonates. Twelve neonates with abnormally echogenic or "bright" vessels on cranial sonograms were studied. Records of these 12 patients were reviewed and were correlated with the neuropathologic findings available in four. The clinical diagnoses were cytomegalovirus infection (five patients), rubella (two patients), congenital syphilis (one patient), and trisomy 13 syndrome (three patients). No diagnosis was made in one infant. At neuropathologic examination, perforating medium-sized arteries to the basal ganglia and thalami had thickened hypercellular walls, with deposits of amorphous basophilic material in three infants. Results of computed tomography and radiography of brain sections were normal in these areas. Sonography is helpful in detecting early noncalcific inflammation and mineralization in vasculitis. Although nonspecific, these findings should alert the physician to the possibility of congenital infection or chromosomal abnormality.

Basal Ganglia↗