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Biomedical subjects

N Adachi

Publications and source records attributed to N Adachi.

At least 163 records · Page 9Linked to original sources
PubMed1993

Establishment and characterization of a novel human monocytic leukemia cell line (KP-1) expressing scavenger receptor.

A new monocytic leukemia cell line (KP-1) was established from a 2-y-old Japanese girl with acute monocytic leukemia. The KP-1 cells were maintained in suspension culture with a doubling time of 96 h. The cells were positively stained with alpha-naphtyl butyrate esterase, but not with naphthol AS-D chloroacetate esterase, myeloperoxidase, and periodic acid-Schiff reagent. Cell surface marker analysis revealed that the cells were CD4, CD11a, CD11c, CD13, CD14, CD18, CD33, and HLA-DR positive. Karyotype analysis revealed near diploidy (47 XX) and a translocation t(11;19) was found. When treated with 12-o-tetradecanoylphorbol 13-acetate, KP-1 cells became tightly adherent, showed the enhanced reactivity for alpha-naphtyl butyrate esterase, and produced several monokines such as IL-1 beta, tumor necrosis factor-alpha, and macrophage colony-stimulating factor. Immunoelectron microscopy demonstrated that the human macrophage scavenger receptor was expressed after 12-o-tetradecanoylphorbol-13-acetate treatment, and the cells accumulated a large amount of cholesterol esters in the presence of acetylated LDL. Compared with another human monocytic leukemia cell line, THP-1, KP-1 expressed scavenger receptor and accumulated cholesterol ester more rapidly in the presence of 12-o-tetradecanoyl phorbol-13-acetate and acetylated LDL. Scatchard analysis using 125I-labeled acetylated LDL revealed a typical saturation curve with an apparent kd of 1.7 x 10(-7) M and 3400 binding sites per cell. KP-1 retained the characteristics of monocyte-macrophage lineage cells and will facilitate the in vitro studies of the pathologic and physiologic roles of scavenger receptors.

Antigens, Neoplasm↗
PubMed1993

Effect of a new psychoactive compound, MCI-225, on brain monoamine metabolism in rats.

Effect of MCI-225 on brain monoamine metabolism was examined in rats. MCI-225 (30 mg/kg, p.o.) had no influence on noradrenaline (NA) levels, but significantly inhibited the NA turnover in the hippocampus and hypothalamus. This compound also significantly increased the 5-hydroxyindoleacetic acid (5-HIAA)/5-hydroxytryptamine ratio in the cerebral cortex, hippocampus and striatum; and it enhanced the probenecid-induced 5-HIAA accumulation in the striatum. In the microdialysis study, MCI-225 markedly increased the NA output, but decreased the 3,4-dihydroxyphenylethyleneglycol output from the hypothalamus of urethane-anesthetized rats. These results suggest that MCI-225 enhances both noradrenergic and serotonergic function by inhibiting NA uptake and accelerating 5-HT turnover, respectively.

Animals↗
PubMed1993

[Cerebral hemorrhage in a case of antiphospholipid antibody syndrome].

We describe a 36-year-old man with antiphospholipid antibody syndrome complicated by cerebral hemorrhage. In December 1991 he was brought to another hospital with sudden onset of left hemiparesis and status epilepticus. He had been well previously. A CT scan and MRI showed a cerebral hematoma located in the right frontoparietal region. Twelve days later he was transferred to our hospital. Although a CT scan, MRI, and cerebral angiography were repeated, they did not reveal any abnormality regarding an etiology. Only persistently abnormal finding in laboratory studies was positive for lupus anticoagulant and anticardiolipin antibody, i.e. antiphospholipid antibodies. There was no serological evidence of SLE or other autoimmune diseases. Stereotactic biopsy of the hematoma wall and scalp artery showed no abnormality. Based on above findings we conclude that antiphospholipid antibodies have played an important role for the hemorrhage. Antiphospholipid antibody syndrome should be considered in a case of an unexplained cerebral hemorrhage especially in a young and normotensive patient.

Adult↗
PubMed1993

[A case of a giant epidermoid cyst on the occipital scalp].

The authors report a case of a 61-year-old woman presenting with a giant mass on the occipital scalp. The patient had no neurological deficits and was of normal intelligence. The lesion was soft and covered by an unremarkable epidermis. The preoperative radiologic evaluation was made by CT, MR Imaging, and by cerebral angiogram. The mass produced an inhomogeneously low-intensity signal involving also a high-intensity signal. It was shown, on the T1 weighted image, that it did not communicate with the intracranial space, and there was no gadolinium-enhanced lesion. MR Imaging was superior to CT in the evaluation of the giant mass on the scalp and was particularly useful in surgical planning. At surgical resection, a soft fluffy, white-colored tumor which measured 16 x 10 x 7 cm was totally removed. Pathological diagnosis of the tumor was epidermoid cyst.

Epidermal Cyst↗
PubMed1993

[Clinical research of patients with epilepsy over age 50 years--a retrospective study of early onset case].

One hundred-sixteen patients with epilepsy over 50 years old were investigated to explore the clinical characteristics of epilepsy in elderly persons. Eighty-four patients having seizures within the last 3 years (residual group) were compared with 32 patients having no seizures within the last 3 years (disappeared group). Regarding the epilepsy type, there were 87 partial epilepsies (64 in the residual group and 23 in the disappeared group) which were approximately 70 percent of the total patients. Generalized epilepsies were comparatively rare in the both groups. Eleven patients with progressive myoclonus epilepsy were observed in the residual group. Regarding the seizure type, generalized convulsive seizures (GCS) were more likely to disappear than partial seizures regardless of number of seizures the patient had. Thirty-eight patients (29 in the residual group and 9 in the disappeared group) had histories of psychiatric problems. Paranoid states were most commonly seen in 12 patients in the residual group and 5 patients in the disappeared group. Intellectual disturbance was seen more frequently in the residual group.

Aged↗
PubMed1992

Characterization of cDNA encoding the mouse DNA topoisomerase II that can complement the budding yeast top2 mutation.

Several cDNA clones encoding mouse DNA topoisomerase II were obtained from a mouse spermatocyte cDNA library and the entire coding sequence of the gene was determined. The mouse DNA topoisomerase II consists of 1528 amino acids with a molecular weight of 173 kDa. It shares significant homologies with the other eucaryotic enzymes, although species-specific sequences are observed in their highly charged C-terminal regions. The complete mouse TOP2 cDNA was put under yeast GAL1 promoter and examined for complementation of top2ts mutation in S.cerevisiae. We found that the cloned mouse gene could rescue the temperature-sensitive top2ts mutation, depending on its induction by galactose. The functional expression of the mouse DNA topoisomerase II in yeast was further confirmed by enzymatic assays and by immunological methods with antibodies specific for the mouse enzyme.

Amino Acid Sequence↗
PubMed1992

Direct evidence for increased continuous histamine release in the striatum of conscious freely moving rats produced by middle cerebral artery occlusion.

Extracellular histamine in the stratum of conscious freely moving rats collected by intracerebral microdialysis 1 day after implantation of a U-shaped dialysis probe was measured by HPLC coupled with postcolumn o-phthalaldehyde derivatization fluorometry. The basal fractional histamine outputs were almost constant from 1 to 7 h after the start of perfusion (5.9-8.4 pg/30 min). Depolarization by perfusion with a high K+ (100 mM)-containing medium produced a significant (124%) increase and neuronal blockade by perfusion with a tetrodotoxin (1 microM)-containing medium resulted in a 68% reduction in the histamine output. The histamine output was markedly reduced by intraperitoneal injection of alpha-fluoromethylhistidine (100 mg/kg), an irreversible inhibitor of histidine decarboxylase, or (R)-alpha-methylhistamine (5 mg/kg), a potent and specific H3-receptor agonist. After middle cerebral artery (MCA) occlusion, the histamine output gradually increased, and reached four times the control value 8 h later. When rats were pretreated with metoprine (10 mg/kg), a histamine N-methyltransferase inhibitor, there was no significant difference in the histamine output between the MCA-occluded and the sham-operated groups during the first 3.5 h after the operation, but the histamine output gradually increased thereafter in the MCA-occluded group. In rats treated with alpha-fluoromethylhistidine, MCA occlusion failed to cause an increase in the histamine output. These results demonstrate that MCA occlusion induces a long-lasting increase in neuronal histamine release in the rat striatum.

Animals↗
PubMed1992

Veno-occlusive disease of the liver after combined adjuvant chemotherapy for a 1-year-old boy with rhabdomyosarcoma: potential usefulness of the gabexate mesylate (FOY).

A tumor in the left thigh of a 1-year-old boy was diagnosed as rhabdomyosarcoma (stage 1). The tumor was excised and vincristine (1.5 mg/m2 given twice), actinomycin D (15 micrograms/kg given five times), and cyclophosphamide (600 mg/m2 given once) were prescribed. On the 12th day after initiating this chemotherapy, his liver rapidly enlarged and ascites, pleural effusion, and disturbance of consciousness due to hepatic failure successively appeared. Before these clinical signs appeared, laboratory data demonstrated enhanced coagulation and fibrinolysis such as thrombocytopenia refractory to platelet transfusion and a marked increase in fibrinogen and fibrin degradation product (FDP). Hepatic veno-occlusive disease (VOD) was suspected, and based on the laboratory data indicating enhanced coagulation, anticoagulant (gabexate mesylate; FOY), diuretic, and supportive therapy for hepatic failure was begun. The clinical course was favorable and recovery was complete in 2 months, with no sequelae. We propose that platelet count, coagulation factor levels, and FDP may be useful for the early detection of VOD, and an anticoagulant drug such as FOY is worthy of consideration for the prevention and treatment of VOD.

Anemia↗
PubMed1992

A highly sensitive assay for histamine using ion-pair HPLC coupled with postcolumn fluorescent derivatization: its application to biological specimens.

A simple and highly sensitive method for the determination of histamine (HA) was developed using ion-pair, reversed-phase HPLC coupled with postcolumn o-phthalaldehyde derivatization fluorometry, and it was applied to the unpurified extracts of human and rat plasma, and brains of rats and mice. The HA concentrations both in the plasma and brains determined by the present method were well consistent with the values obtained by cation-exchange HPLC with postcolumn fluorescent derivatization currently in use. The present method was more advantageous than the assay using cation-exchange HPLC: (1) it was three to four times more sensitive (the detection limit was 0.5 pg of HA), and (2) it enabled the measurement of HA in samples containing (R)alpha-methylhistamine, a potent and specific H3-receptor agonist, which could not be separated from HA by cation-exchange chromatography. Using the present method coupled with intracerebral microdialysis, we found in the rat hypothalamus that (R)alpha-methylhistamine (5 mg/kg i.p.) markedly decreased the extracellular concentration of HA with a maximal effect (83% reduction) during 30-60 min after injection, suggesting that most of HA in the microdialysate fraction is neuronal in origin.

Animals↗
PubMed1992

Aphasic seizure caused by focal epilepsy in the left fusiform gyrus.

We report a patient with paroxysmal aphasia evoked by ictal epileptiform discharges localized to the left fusiform gyrus, where a small brain tumor existed. The intracranial EEG recordings during other seizures demonstrated a close functional link between the left fusiform gyrus and Wernicke's area. The patient also showed transient aphasia with electrical stimulation of the left fusiform gyrus.

Adult↗
PubMed1992

[Dyspnea and ventilatory muscle function during exercise on air and oxygen breathing in patients with chronic obstructive pulmonary disease (COPD)].

Exercise performance and dyspnea in COPD patients have been shown to be improved with supplemental oxygen, although the exact mechanisms resulting in the improvement are still unclear. The purpose of the present study was to investigate a possible relationship between ventilatory muscle function and sensation of dyspnea (modified Borg Scale) during exercise on 20% O2 and 30% O2. Eight patients with COPD (FEV1 1.06 L +/- 0.30 L) exercised on a treadmill two times breathing compressed air or 30% oxygen with a one hour rest in between. The electrical activity of the diaphragm (EMGdi) was recorded with esophageal electrodes, and that of the sternomastoid muscle (EMGsm) was recorded from the fine wire electrodes. The ratio of high frequency (150 to 350 Hz) to low frequency (20 to 47 Hz) power (H/L) of EMGdi was analyzed to assess diaphragmatic fatigue, which was defined as a 20% fall of H/L ratio from the control value. Flow, volume, O2 Saturation (SaO2), esophageal pressure (Pes) and transdiaphragmatic pressure (Pdi) were measured. Tension time index (TTdi) was calculated from Pdi and the ratio of inspiratory time to total time for one cycle (Ti/Ttot). At rest, we measured maximal esophageal pressure (Pesmax), maximal transdiaphragmatic pressure (Pdimax), maximal integrated EMGdi (EMGdimax) and EMGsm (EMGsmmax). Incremental exercise was discontinued by dyspnea. The walking distance achieved was increased in all patients on 30% O2. Dyspnea and desaturation were significantly improved on 30% O2 breathing, and the onset of diaphragmatic fatigue was delayed.(ABSTRACT TRUNCATED AT 250 WORDS)

Aged↗
PubMed1992

[A patient with gigantic heterotopic gray matter with epileptic seizures].

We report a patient with partial seizure and gigantic heterotopic gray matter. A 23-year-old young man was admitted to our hospital with complaints of frequent epileptic seizures and psychiatric symptoms. There was psychomotor delay in infancy. At the age of 4 years, afebrile convulsions appeared on several occasions. Seizures characterized by a lapse of consciousness started at the age of 13 years. He often stayed in a fantasy world and became very emotional at such time. Cranial CT demonstrated an irregularity in the wall of right lateral ventricle and disappearance of the posterior horn on the same side. This lesion, adjacent to that wall, had a signal intensity that was similar to that of the gray matter on each sequence in MRI. Histopathology of this lesion showed a number of large and small neurons. Therefore, heterotopic gray matter was diagnosed. MRI demonstrated wide cortices suggesting polymicrogyria in the right parietal lobe. Complex partial seizures with eye deviation to the left were recognized. Interictal EEG showed frequent high voltage spikes in the right temporal, fronto-temporal and parieto-occipital areas independently. Therefore, epileptic foci were thought to exist in or around those lesions.

Adult↗
PubMed1991

10-year follow-up study of epilepsy with psychosis.

Thirty-three cases of psychosis associated with epilepsy were followed in our clinic for 10 years. In 12 cases, the psychotic symptom appeared episodically and 9 of them had more than one relapse and 7 of them more than 2 relapses. Only 3 cases had no relapse. In 21 cases, the psychotic symptoms were continuous, lasting more than 2 years. In 8 of them, the symptoms were stable and remained unchanged but in 13 of them, the symptom showed exacerbation and partial remissions. In 11 cases, a decrease or discontinuation of antipsychotic drugs (mostly haloperidol) significantly provoked or aggravated the psychotic symptoms.

Adult↗
PubMed1991

Changes in the metabolism of histamine and monoamines after occlusion of the middle cerebral artery in rats.

Changes in the levels of histamine, monoamines, and their metabolites in the cerebral cortex and striatum after occlusion of the middle cerebral artery in rats were examined. The water content of the ipsilateral brain regions gradually increased after occlusion. In the ischemic side, 1 h after occlusion, the cortical norepinephrine and striatal 5-hydroxy-tryptamine levels significantly decreased, and striatal 3,4-dihydroxyphenylacetic acid and homovanillic acid levels markedly increased. In contrast, the levels of histamine and tele-methylhistamine in either brain region gradually increased and the changes became pronounced and statistically significant 6-12 h after induction of ischemia. The striatal histamine and tele-methylhistamine reached levels three- and twofold higher, respectively, than those of the contralateral side. In rats treated with alpha-fluoromethylhistidine 1 h before induction of ischemia, elevation of histamine and tele-methylhistamine was not observed. The elevated histamine level in the ipsilateral straitum at 9 h after occlusion was further significantly increased by the treatment with metoprine, an inhibitor of histamine-N-methyltransferase. These results suggest that the histaminergic activity in the brain is gradually enhanced by cerebral ischemia.

Amines↗