Age-related electrical status epilepticus during sleep and epileptic negative myoclonus in DRPLA.
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Aging↗
Biomedical subjects
K Kashihara
Publications and source records attributed to K Kashihara.
Bezold-Jarisch reflex blunts arterial baroreflex via the shift of neural arc toward lower sympathetic nerve activity.
Although the Bezold-Jarisch (BJ) reflex is potentially evoked during acute myocardial ischemia or infarction, its effects on the static characteristics of the arterial baroreflex remain to be analyzed in terms of an equilibrium diagram between the neural and peripheral arcs. The neural arc represents the static input-output relationship between baroreceptor pressure input and efferent sympathetic nerve activity (SNA), whereas the peripheral arc represents that between SNA and arterial pressure (AP). In 8 anesthetized rabbits, we increased carotid sinus pressure stepwise from 40 to 160 mmHg in increments of 20 mmHg at one-minute intervals while measuring renal SNA and AP under control conditions and during the activation of the BJ reflex by intravenous administration of phenylbiguanide (PBG, 100 microg.kg(-1).min(-1)). The neural arc approximated a sigmoid curve whereas the peripheral arc approximated a straight line. PBG decreased AP at the operating point from -91.3 +/- 2.4 to -71.7 +/- 3.1 mmHg (P < 0.01), and attenuated the total loop gain at the operating point from -1.31 +/- 0.44 to -0.51 +/- 0.14 (P < 0.05). The equilibrium diagram indicated that PBG caused a parallel shift of the neural arc toward lower SNA such that the maximum SNA was reduced to approximately 60% of control. PBG decreased neural and peripheral arc gains at the operating point to approximately 43% and 77%, respectively. In conclusion, the BJ reflex blunts arterial baroreflex via the shift of the neural arc toward lower SNA.
Animals↗
Effects of short- and long-acting dopamine agonists on sensitized dopaminergic neurotransmission in rats with unilateral 6-OHDA lesions.
The effects of short and long-acting dopamine agonists on sensitized dopaminergic transmission in an animal model of Parkinson's disease were investigated. Rats with 6-hydroxydopamine (6-OHDA) lesions of the left nigrostriatal dopaminergic pathway were pre-exposed i.p. to 50 mg/kg methyl levodopa for 10 days. After a 7-day withdrawal period, these animals were treated with saline i.p., 0.05 mg/kg apomorphine s.c., or 0.5 mg/kg cabergoline i.p., once daily for 7 days. On the 8th day, rats in each treatment group received a challenge dose of 0.05 mg/kg apomorphine or saline s.c. The temporal changes in the number of rotations away from the 6-OHDA lesion side were evaluated after the challenge. The apomorphine challenge increased the number of rotations more markedly in the apomorphine pretreated rats than in the other pretreatment groups. In cabergoline pretreated rats, the number of rotations was significantly lower than that of saline-pretreated animals. Pretreatment with saline did not alter the apomorphine sensitivity of rotational behavior. These findings suggest that the repeated administration of long-acting dopamine agonists may reduce sensitized dopaminergic transmission in dopamine-depleted rats, whereas short-acting ones may further enhance sensitization of the transmission process.
Adrenergic Agents↗
Diffusion weighted magnetic resonance imaging in a case of acute Wernicke's encephalopathy.
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Acute Disease↗
Diagnostic significance of tau protein in cerebrospinal fluid from patients with corticobasal degeneration or progressive supranuclear palsy.
Distinguishing corticobasal degeneration (CBD) from progressive supranuclear palsy (PSP) is clinically and pathologically difficult, and a useful biological marker to discriminative these two diseases has been a subject of clinical interest. In the present study, we assessed tau protein levels in cerebrospinal fluids by sandwich ELISA to distinguish CBD from PSP. The subjects consisted of 27 cases of CBD, 30 cases of PSP, and 36 healthy controls (CTL). The tau values in CBD were significantly higher than those in PSP (P<0.001) and those in CTL (P<0.001). The assay of CSF tau provided diagnostic sensitivity of 81.5% and specificity of 80.0% between CBD and PSP according to receiver-operating characteristic (ROC) curve analysis. When values were compared separately with respect to stage of the disease, differences in the values for moderate CBD vs. moderate PSP had the greatest significance (P<0.001 sensitivity 92.3%, specificity 100.0%), followed by cases of mild CBD and PSP (P<0.005, sensitivity 100.0%, specificity 87.5%). The values in severe CBD and PSP were not significantly different (P=0.07, sensitivity 100%, specificity 75.0%). Using data obtained from a larger number of disease cases, we confirmed our previous findings that tau protein levels in cerebrospinal fluids in patients with CBD are significantly higher than those in patients with PSP. Because tau protein levels in cerebrospinal fluids are significantly higher in early CBD cases than in early PSP cases, measurement of tau protein levels in cerberospinal fluids may be useful for the differential diagnosis of early CBD from early PSP.
Aged↗
Glutamate enhances DNA fragmentation in cultured spinal motor neurons of rat.
The role of glutamate in the mechanism of spinal motor neuron death is not fully understood. With addition of glutamate to primary culture of 11-day-old rat spinal cord, terminal deoxynucleotidyl transferase-mediated dUTP-biotin in situ nick end labeling (TUNEL) positive nuclei were found in spinal large motor neurons from 24 h, and the number of TUNEL positive large motor neurons greatly increased at 48 h. In contrast, only a small number of large motor neurons became TUNEL positive at 48 h with addition of vehicle to the primary spinal cord culture. The present results show that excessive amount of glutamate enhances DNA fragmentation in developing large motor neuron of cultured spinal cord by involving in apoptotic process of the neurons.
Animals↗
Fractal dimension analysis of static stabilometry in Parkinson's disease and spinocerebellar ataxia.
The static stabilometry patterns associated with Parkinson's disease (PD, n = 15) and spinocerebellar ataxia (SCA, n = 15) were compared with those of normal control (n = 15) by measuring the fractal dimensions. Fractal dimensions were estimated using the modified pixel dilation (mPD) method. The fractal dimensions with closed eyes showed a significant correlation with Environmental area for SCA group (p < 0.05). The fractal dimension for SCA group was significantly higher with closed eyes than that with open eyes (p < 0.05). The fractal dimension with closed eyes was significantly higher in PD and SCA groups than that in normal group (p < 0.05). The fractal dimension with closed eyes was higher when the clinical stage was more severe with PD and SCA group while Environmental and Longitude/Environmental areas were not. These findings suggest that the fractal dimension is more sensitive than traditional stabilometric analysis in an evaluation of postural instability in PD and SCA.
Aged↗
[Myositis as a manifestation of chronic graft-versus-host disease] [In Process Citation]
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Journal Article↗
Sjögren's syndrome with acute transverse myelopathy as the initial manifestation.
This is the first report of a patient with acute transverse myelopathy as the initial manifestation of primary Sjögren's syndrome (SS). The patient developed tetraparesis and sensory disturbance within 6 days of onset. Spinal MRI showed an extensive intraparenchymal lesion with high T2-weighted signal intensity, gadolinium enhancement, and cord swelling. Although the patient did not show clinical sicca symptoms, primary SS was diagnosed on the basis of clinical tests on lacrimal and salivary glands which showed high levels of autoantibodies. Treatment with prednisone improved motor and sensory symptoms and resulted in improvement of MRI findings. The present case suggests that acute transverse myelopathy can occur as an initial symptom of SS.
Aged↗
Inflammatory demyelinating polyradiculoneuropathy associated with interstitial lung disease.
A 58-year-old woman presented with inflammatory demyelinating polyradiculoneuropathy accompanied by sensory and motor disturbance and interstitial lung disease. Corticosteroid therapy led to a marked amelioration of both the neuropathy and the lung disease. We suggest that a demyelinating neuropathy is associated with an interstitial lung disease.
Anti-Inflammatory Agents↗
Effects of repeated methyl levodopa administration on apomorphine sensitivity of rotational behavior and striatal Fos expression of rats with unilateral 6-OHDA lesions.
This study was designed to elucidate the mechanism to develop levodopa-induced dyskinesia in patients with Parkinson's disease. For this purpose, we administered methyl levodopa repeatedly to a rat model of Parkinson's disease with unilateral 6-hydroxydopamine (6-OHDA)-induced lesion of the nigrostriatal dopamine pathway. After a washout period, we measured apomorphine sensitivity of contralateral rotation and made parallel determination of Fos expression in the caudate-putamen and globus pallidus of the same animal. Once daily, i.p. injection of methyl levodopa plus benserazide for 10 days increased the number of rotations over time. A challenge dose of apomorphine showed enhanced rotational response in rats pretreated with methyl levodopa. Repeated administration of methyl levodopa resulted in diminished apomorphine sensitivity of Fos expression in the dopamine depleted caudate-putamen and in enhanced sensitivity in the globus pallidus of the same side. Present results may add evidence to the idea that repeated administration of levodopa develops dopaminergic sensitization mediated by augmented activation of pallidal neurons involved in D2-responsive pallidal output pathway.
Animals↗
Temporal profile of CRE DNA-binding activity in the rat hippocampus following a kindling stimulation.
This study was designed to establish a role for cAMP-responsive element (CRE) binding protein (CREB) in signal transduction cascade in the hippocampus associated with kindling. Male Sprague-Dawley rats were kindled from the left amygdala until they exhibited Racine's class 5 generalized seizures [Racine (1972). EMBO J. 11, 3337-3346] Nuclear proteins were extracted from dorsal hippocampi obtained from 0 to 24 h after final kindling stimulation. From these, we evaluated the temporal pattern of CRE DNA-binding activity by use of a gel mobility-shift assay with a 32P-labeled CREB oligonucleotide probe. CRE-binding activity in the hippocampus was enhanced significantly at 2 h and returned to baseline level within 4 h after the stimulation. Our results suggest that CREB may be involved in the hippocampal signal transduction pathway of rats activated in response to a kindling stimulation to the amygdala. However, the transient elevation of CRE-binding activity following a seizure in a kindled animal also suggests that persistent activation of CREB may not be required for maintenance of the kindling phenomenon.
Animals↗
Isolated oculomotor nerve palsy in lymphoma.
We report a patient with non-Hodgkin's lymphoma who developed a unilateral left oculomotor nerve palsy. Only eyelid lifting and vertical gaze were involved. Lateral gaze or sizes and light reactions of pupils were not involved. Magnetic resonance imaging revealed an enhancement of an upper part of left cavernous sinus and the posterior clinoid process. It was conceivable that lymphoma invaded the upper branch of oculomotor nerve. Such neurological symptoms in cases of oculomotor nerve palsy by lymphoma have not been reported previously. Because cranial neuropathy could occur as the first sign of lymphoma, lymphoma is an important differential diagnosis for the partial oculomotor palsy such as our present case.
Aged↗
A case of spinocerebellar ataxia accompanied by severe involvement of the motor neuron system.
We report a sporadic case of spinocerebellar ataxia accompanied by later but severe involvement of the motor neuron system. A 72-year-old man began to show ataxia and dysarthria at age 66 years. Neurological examinations revealed saccadic eye movement, slurred speech, truncal ataxia, pyramidal sign, and urinary disturbance. Neither history of alcoholism nor hereditary factors were found. He developed muscular atrophy of the lower and upper extremities and limb ataxia within three years. Superficial and deep sensations were diminished in both feet four years after onset. Thus, he presented with cerebellar ataxia, bulbar sign, upper and lower motor neuron symptoms, sensory disturbance, and autonomic sign after six years at age 72. The level of serum, creatine phosphokinase (CPK) was increased, and muscle biopsy showed marked neurogenic change. Magnetic resonance imaging (MRI) revealed mild cerebellar and pontine atrophy. Although the combination of spinocerebellar ataxia and motor neuron disease is very rare, the present case suggests the inter-relation of the spinocerebellar and motor neuron systems, and presents peripheral neuropathy as a subtype of multisystem atrophy.
Aged↗
Temporal changes in expression of neuronal nitric oxide synthase mRNA in the rat hippocampus associated with kainate-induced seizures.
We studied the temporal changes in expression of neuronal nitric oxide (NO) synthase (nNOS) mRNA in the hippocampus of rats treated with kainic acid by use of in situ hybridization technique. Intraperitoneal injection of 10 mg kg-1 kainic acid decreased expression of nNOS mRNAs in the dentate gyrus and CA3 region of the hippocampus at 3 h and 8 h and increased it in the dentate gyrus and CA1 at one week after treatment. Although our previous study indicated that administration of kainic acid increased NO generation in the rat hippocampus, present results suggest that the injection of kainic acid results in differential regulation of nNOS mRNA and NO formation in the rat hippocampus.
Animals↗
Myositis as a manifestation of chronic graft-versus-host disease.
We report a 22-year-old man who had myositis in the course of chronic graft-versus-host disease after bone marrow transplantation for acute monocytic leukemia. The distribution of muscular involvement was different from idiopathic polymyositis. Muscular atrophy and weakness were noted in the distal muscles as well as in the proximal muscles of the upper extremities but there was little weakness in the proximal muscles of the lower extremities. However, histological and immunohistochemical study of the biceps brachii muscle showed findings similar to those of idiopathic polymyositis. It was suggested that myositis can be a manifestation of chronic GVHD caused by a cellular immune reaction by donor T cells.
Adult↗
[A case of neuro-Behçet's disease with HLA B54 and predominant cerebral white matter lesions].
We report a 55-year-old woman with neuro-Behçet's disease with HLA B54 and predominant cerebral white matter lesions. She showed a cryptogenic high fever and cerebral cortical symptoms such as perseveration, limbkinetic apraxia and dementia. CSF study showed an increase of cell count and protein and a decrease of sugar. MRI showed diffuse T2-high signal intensity mainly in the subcortical white matter of left parieto-occipital lobes and basal ganglia. Her clinical signs greatly improved after administration of prednisolone. Her HLA type was not B51 but B54. Though our patient did not completely satisfy clinical criteria for neither neuro-Behçet's disease nor Sweet's syndrome, she showed partial features of both Behçet's disease and Sweet's syndrome.
Behcet Syndrome↗
Motor neglect following left thalamic hemorrhage: a case report.
We present a report on a patient who developed unilateral motor neglect of the right hemibody after a left thalamic hemorrhage. He presented with pure motor neglect without aphasia, ideomotor apraxia, or unilateral spatial neglect due to a lesion in the centromedian parafascicular (CMPF) and ventrolateral (VL) nuclei of the left thalamus. Although unilateral motor neglect is usually associated with right hemispheric lesions, a left thalamic lesion may also result in isolated motor neglect.
Adult↗