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Biomedical subjects

M Satoh

Publications and source records attributed to M Satoh.

At least 451 records · Page 25Linked to original sources

[Apoptosis in the process from viral myocarditis to dilated cardiomyopathy].

Detection of viral genomic RNAs in myocardium of dilated cardiomyopathy (DCM) suggested the relationship between DCM and viral myocarditis. The viral infection may cause cytokine expression followed by induction of inducible nitric oxide synthase (iNOS) and expression of Fas antigen. The iNOS has potent and long-lasting effects on NO generation, has cytotoxic effects and triggers apoptosis in car diomyocytes. In addition, the expression of Fas antigen directly induces apoptosis.

Apoptosis↗

[Clinical significance of serum soluble interleukin-2 receptor (sIL-2R) determination in patients with rheumatoid arthritis].

It has been recently shown that soluble interleukin-2 receptor (sIL-2R) is related to the pathogenesis of autoimmune diseases. We determined serum levels of sIL-2R in patients with rheumatoid arthritis (RA). Fifty-three patients (3 males and 50 females from 35 to 70 years old) and sex- and age-matched 50 healthy subjects were included in this study. The sIL-2R concentrations positively correlated with Lansbury index of RA (r = 0.602, p < 0.01). There was a significant correlation between sIL-2R levels and the prevalence of CD3+.HLA-DR+ lymphocytes (r = 0.420, p < 0.01).

Adult↗

[Recanalization of dural sinus occlusion following the disappearance of dural arteriovenous fistula: report of a case].

A 73-year-old female was admitted to our hospital because of disturbed consciousness and left-sided motor weakness. Computed tomographic scans demonstrated a hemorrhagic infarction in the right parietal region. Right carotid angiograms showed both the posterior portion of the superior sagittal sinus (SSS) and the entire left transverse sinus simultaneously occluded. Left carotid angiograms revealed an enlarged occipital artery, which had direct communications to the left sigmoid sinus and the superior petrosal sinus. These findings were consistent with dural arteriovenous fistula (D-AVF). The laboratory examinations yieled normal results. The patient was managed conservatively with glyceol and anticonvulsants for four weeks and eventually recovered with complete resolution of hemiparesis. Follow-up angiography carried out 6 weeks later showed the SSS, partially stenotic, but recanalized with no evidence of venous congestion. The D-AVF still remained opacified, but there was a marked reduction in retrograde flow to the sigmoid sinus. Further repeated angiograms obtained at 10 months after the onset confirmed complete recanalization of the SSS and disappearance of the D-AVF. From the timing of the angiographies, we considered that the sinus occlusion was caused by the high arterial flow to the fistula and its disappearance made recanalization of SSS possible.

Aged↗

Non-rubeotic angle-closure glaucoma associated with ciliary medulloepithelioma.

Non-rubeotic angle-closure glaucoma associated with ciliary medulloepithelioma was reported in a 3-year-old boy. On the first visit, a free-floating white mass was observed in the anterior chamber of his right eye. The mass disappeared spontaneously after 5 months of observation. One year later, angle-closure glaucoma with peripheral anterior synechia occurred in the same eye and intraocular pressure rose to 55 mmHg. After glaucoma surgery, the white mass appeared again in the anterior chamber of his right eye. By cycloscopy, numerous small grayish-white masses could be seen on the ciliary body and in the posterior chamber. Histopathological examination of one mass confirmed medulloepithelioma and the eye was enucleated. Disseminated tumor cells in the anterior chamber had caused the cornea and the peripheral iris to adhere to each other, resulting in the formation of peripheral anterior synechia.

Anterior Chamber↗

A single residue, Lys108, of the delta-opioid receptor prevents the mu-opioid-selective ligand [D-Ala2,N-MePhe4,Gly-ol5]enkephalin from binding to the delta-opioid receptor.

Previously, we found that replacement of the region around the first extracellular loop of the delta-opioid receptor (OPR) with the corresponding region of the mu-OPR gives the high affinity for [D-Ala2,N-MePhe4,Gly-ol5]enkephalin (DAMGO), a mu-opioid-selective ligand, to the resultant chimeric receptor, DMDD, suggesting that the difference in the amino acid sequence within this region between the mu- and delta-OPRs is critical for the discrimination between these receptors by DAMGO. In the current study, we carried out systematic replacements of seven non-conserved residues in this region of the delta-OPR with the corresponding amino acid found in the mu-OPR. Among the seven mutant receptors, only one mutant receptor, delta K108N, showed high affinity (Ki = 18.68 +/- 5.27 nM) for DAMGO, which was comparable to that of the DMDD receptor (Ki = 23.77 +/- 4.27 nM) and 75-fold higher than that of the wild-type delta-OPR (Ki = 1405 +/- 161 nM). Lys108 in the delta-OPR was systematically replaced with 19 kinds of amino acids other than lysine. Among the resultant mutant receptors, 14 mutants bound DAMGO with Ki values comparable to those of the DMDD receptor, ranging from 4.20 to 43.38 nM. These findings suggest that Lys108 of the delta-OPR prevents DAMGO from binding to the delta-OPR rather than that the asparagine residue at the corresponding position in the mu-OPR is necessary for DAMGO binding. In addition, the replacement of Lys108 of the delta-OPR with asparagine dramatically increased the affinity for other peptidic mu receptor-selective ligands, such as dermorphin and D-Pen-Cys-Tyr-D-Trp-Orn-Thr-Pen-Thr-NH2.

Adenylyl Cyclases↗

[Motilin and motilin receptor].

Motilin, a 22 amino acid polypeptide, is known to play an important role in the initiation of phase III activity of the interdigestive migrating contractions (IMC) in the dog and man. The precursor of human motilin consists of 115 amino acids including a 25 amino acid signal peptide in direct linkage with the 22 amino acid motilin sequence and a 66 amino acid carboxy-terminal motilin-associated peptide (MAP). Northern blot analysis revealed that motilin mRNA is abundant in the duodenum. In vitro studies suggested that motilin acts directly on motilin receptors located on gastrointestinal smooth muscle cells in the rabbit, cat and man. On the contrary, in vivo studies suggested that motilin receptors are likely to be present in the nervous system. The cloning of motilin receptors is needed to clarify the detailed mechanism(s) of motilin's action.

Amino Acid Sequence↗

Receptor binding and antagonist properties of a novel endothelin receptor antagonist, TAK-044 [cyclo[D-alpha-aspartyl-3-[(4-phenylpiperazin-1-yl) carbonyl]-L-alanyl-L-alpha-aspartyl-D-2-(2-thienyl) glycyl-L-leucyl-D-tryptophyl]disodium salt], in human endothelinA and endothelinB receptors.

Receptor binding and antagonist properties of an endothelin (ET) receptor antagonist, TAK-044 ¿cyclo[D-alpha-aspartyl-3-[(4-phenylpiperazin-1-yl) carbonyl]-L-alanyl-L-alpha-aspartylD-2-(2-thienyl) glycyl-L-leucyl-D-tryptophyl]disodium salt¿, were investigated using recombinant human ETA and ETB receptors expressed in Chinese hamster ovary cells. The membranous ETA receptor was shown to be heterogeneous in ET-3 binding affinity (Hill coefficient = 0.54, Kd1 = 390 pM and Kd2 = 8.1 nM). This heterogeneity disappeared upon the addition of guanosine-5'-O-3-thiotriphosphate (Hill coefficient = 0.95, Kd = 7.8 nM). The Kd (from a computer program LIGAND analysis) and Ki (from Dixon plot analysis) values of TAK-044 were 95 and 120 pM for the membranous ETA receptor and 41 and 60 nM for the ETB receptor, respectively. The Kd values of TAK-044 for the ETA receptor was comparable to that of ET-1. The Ki values of TAK-044 for the cellular ETA and ETB receptors were 130 pM and 130 nM at 5,000 cells/well and 1.3 and 590 nM at 50,000 cells/well, respectively. Dixon plot analysis indicated that TAK-044 is a competitive inhibitor of ET-1 binding. TAK-044 inhibited ET-1-induced phosphatidylinositol hydrolysis and arachidonic acid release at 50,000 cells/well in a competitive manner with respective pA2 values of 8.5 and 8.7 in the ETA-expressing cells and 7.4 and 6.6 in the ETB-expressing cells. TAK-044 suppressed ET-1-induced transient increase in intracellular Ca+2 concentration in the ETA- and ETB-expressing cells with respective IC50 values of 2.8 and 230 nM. TAK-044 is a potent and competitive ETA receptor antagonist which simultaneously exhibits definite antagonist activity at the ETB receptor.

Animals↗

[Aberrations of the p 53 gene in roentgenographically occult squamous cell carcinoma of the lung].

Mutations of one p 53 allele and LOH occur in advanced lung cancers, but in early lung cancer these things were not known well. To make clear carcinogenesis of lung cancer, it is important to study p 53 alterations in early lung cancers. We studied them in 29 roentgenographically occult lung cancers by means of PCR-SSCP and microsatellite marker. PCR-SSCP was performed for exon 7 of the p 53 gene. LOH was found in 6 cases and point mutation was found in 2 cases (codon 234 T-A transversion, codon 245 G-T transition). Frequency of LOH and point mutations was lower than in the cases of advanced lung cancers. These things suggested the clonal expansion of aberrant p 53 gene occurred in the course of cancer development (i.e., roentgenographically occult lung cancer to advanced lung cancer).

Carcinoma, Squamous Cell↗

[Central alveolar hypoventilation syndrome with compression of the medulla oblongata by tortuous and elongated vertebral arteries].

A 43-year-old woman was admitted to the hospital with hypoventilation, which developed when she took sedatives because of an operation on an adrenal gland tumor. Central alveolar hypoventilation syndrome was diagnosed after neurophysiological and pulmonary-function tests. Magnetic resonance imaging and vertebral angiography revealed that tortuous and elongated vertebral arteries compressed the ventral sides of the medulla oblongata, which may have caused the hypoventilation. Mechanical ventilation during sleep improved her condition. Home mechanical ventilation was prescribed and she has been well during follow up as an outpatient.

Adult↗

[Recovery from descending necrotizing mediastinitis and multiple organic failure after seven months of mechanical ventilation].

A 61-year-old man with a history of hypertension and diabetes mellitus had a tooth extracted. Nine days later, he was admitted to the hospital with complaints of high fever, dyspnea, and anterior chest pain. Physical examination revealed a drowsy man with a fever of 38.2 degrees C, blood pressure of 66/44 mmHg, and marked redness and swelling from the neck to anterior part of the chest. Laboratory examination indicated severe infection and multiple organ failure, consisting of cardiac, respiratory, renal, and hepatic failure, with disseminated intravascular coagulation. Chest X-ray and CT-scan films showed abscesses extending from the neck to the mediastinum, and bilateral pleural effusion. Immediately, he was treated with catecholamines, furosemide, mechanical ventilation with a high concentration of oxygen, continuous drainage, repeated skin incisions, and broad-spectrum antibiotics. In addition, steroid pulse therapy was administered for persistent respiratory failure. On the 28th hospital day, a fistula developed between the trachea and the mediastinum, and an intratracheal tube had to be inserted through the fistula. On the 212 th hospital day, after intravenous hyperalimentation, continuous intravenous insulin infusion, and administration of broad-spectrum antibiotics, catecholamines, and furosemide, the patient was weaned from mechanical ventilation. A restrictive ventilatory defect due to ankylosis and atrophy of underused muscles was noted after weaning, but the PaO2 was high with a low dose of oxygen (1 to 2 l/min), and 21 months later, the blood gases were normal while the patient was breathing room air. As of January, 1996, he was undergoing rehabilitation to promote his recovery from ankylosis, muscle atrophy, and speech dysfunction.

Catecholamines↗

Aortic valve replacement in small aortic annulus with or without annular enlargement.

BACKGROUND AND AIMS OF THE STUDY: Surgical treatments for aortic valve disease in the presence of a small aortic annulus need appropriate indications for operative procedures and precise selection of valve prostheses. The objective of this study was to compare long term results after aortic annular enlargement with those after operation using a small valve prosthesis. MATERIALS AND METHODS: Since 1980, 45 patients with small aortic annulus underwent operation at our institution. There were six men and 39 women, and their ages ranged from 16 to 69 with a mean of 45.6 years. Of these patients, 28 underwent aortic annular enlargements (Nicks' procedure in 13, Manouguian's in 12 and apico-aortic bypass in three patients) and 17 patients received standard aortic valve replacement with a small valve prosthesis (19 mm Standard St. Jude Medical). Mean follow up was 8.6 years in the enlargement group and 4.9 years in the standard group. RESULTS: Early mortality was 3.6% (1/28) in the enlargement group and 5.9% (1/17) in the standard group (NS). The 10-year actuarial survival including all deaths was 85.7% in the enlargement group and 62.7% in the standard group (p < 0.10). The rate of freedom from reoperation at 10 years was 90.7% in the enlargement group and 93.8% in the standard group (NS). The 10-year freedom from all valve-related events was 81.0% in the enlargement group and 58.8% in the standard group (p < 0.05). CONCLUSIONS: The above results suggest that long term mortality and morbidity after aortic annular enlargement might be superior to those after standard AVR with a small valve prosthesis.

Adolescent↗

[Outcome in patients with interstitial lung disease and polymyositis-dermatomyositis--a subgroup with poor prognosis].

To determine the role of interstitial lung disease (ILD) in the outcome of polymyositis-dermatomyositis (PM/DM), we studied 41 patients who had radiographic evidence of ILD among 51 patients with PM/DM. The patients were divided into 3 groups according to therapy: progressive, no change, or improved. Those classified as progressive had significantly higher rates of skin and lung symptoms, milder muscle symptoms, and lower levels of muscle enzymes than the other 2 groups, and none was positive for the anti-Jo-1 autoantibody. Nine patients with DM died of respiratory failure; they had low serum creatine kinase levels, no anti-Jo-1 antibodies, and a rapidly progressive course before death. Autopsy findings were obtained in 7 patients, and all had diffuse alveolar damage as the main pulmonary histological finding. A subgroup of patients with PM/DM-ILD have a poor prognosis, and ILD in PM/DM is an important prognostic factor.

Dermatomyositis↗

[Importance of interstitial lung disease in collagen vascular disease: analysis of outcome].

We studied length of survival and related clinical findings in 715 inpatients with collagen-vascular diseases (1984 through 1994), the diagnostic Kaplan-Meier analysis showed that patients with polymyositis/dermatomyositis and those with systemic sclerosis did not survive as long as those with other types of collagen-vascular disease. Of the patients who died 37% died of respiratory failure due to interstitial lung disease. Patients with interstitial lung disease had better outcomes than did those with idiopathic interstitial pneumonia: they were younger, had higher initial vital capacities, and fewer episodes of acute exacerbation of lung disease than did those with idiopathic interstitial pneumonia. Among patients with interstitial lung disease, those who died of polymyositis/dermatomyositis did so within 1 year, but those who died of systemic sclerosis lived longer. Interstitial lung disease is an important prognostic factor in collagen-vascular disease, and needs further evaluation.

Cause of Death↗

[A case report on graft replacement of ruptured aneurysm of the arch and the descending thoracic aorta associated with dense pulmonary adhesion].

A 73-year-old patient had been followed for aortic arch aneurysm of 54 mm in diameter. He was hospitalized complaining of chest and back pain. A chest CT scan showed ruptured aortic arch aneurysm extending to mid-descending thoracic aorta, and an emergent operation was decided. The trachea was intubated with a univent tube providing a movable blocker (System Corporation) which was directed to the left bronchus for differential lung ventilation. The descending thoracic aorta was exposed through the left 4th intercostal thoracotomy just at the site intending to anastomose a prosthetic graft because of dense pulmonary adhesion. The ascending and arch aorta was approached via median sternotomy. Under deep hypothermia and retrograde cerebral perfusion, total arch and descending aortic replacement was performed using an arch graft providing four branch grafts for neck vessels reconstruction and pump perfusion. The patient showed moderate pulmonary bleeding during and after cardiopulmonary bypass, but improved gradually. He was weaned from the respirator on the 13th post-operative day. During extensive thoracic aortic surgery using left thoracotomy combined with median sternotomy, left lung deflation using a univent tracheal tube with a blocker, and circulatory arrest during distal aortic anastomosis, are useful in preventing lethal pulmonary bleeding caused by lung injury under the fully heparinized condition. However, in cases associated with dense pulmonary adhesion, it is important to dissect carefully just a small area necessary to anastomose a graft, and to take elaborate assistant measures.

Aged↗