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Biomedical subjects

T Ando

Publications and source records attributed to T Ando.

At least 451 records · Page 25Linked to original sources
PubMed1991

[S100a0 protein and creatine kinase isozymes (CK-B & CK-M) in serum and urine might be useful markers for non specific tissue damages by extracorporeal shockwave lithotripsy (ESWL)].

In order to demonstrate that the extracorporeal shockwave lithotripsy (ESWL) for urolithiasis causes a renal damage, we immunoassayed S100a0 protein and creatine kinase isozymes (CK-B & CK-M) in the serum and urine from patients with renal stone (N = 21) and those with ureteral stone (N = 18) before and after ESWL. S100a0 protein and CK-B, which are localized in the proximal renal tubules at relatively high concentrations, were enhanced more or less both in the urine and serum samples after the treatment in both groups of patients. Since CK-M, which is mainly localized in muscle tissue, also increased in both groups of patients, S100a0 protein and CK-B may be derived not only from kidney, but also from muscle tissues.

Adult↗
PubMed1991

Cloning and expression of cDNA coding for the major house dust mite allergen Der f II in Escherichia coli.

A cDNA library corresponding to mite protein was screened using anti-Der f II, a major allergen from the house dust mite Dermatophagoides farinae, antibody. Three possible clones were obtained that contained cDNA fragments coding for Der f II, and the nucleotide sequences of the fragments were determined. There were minor differences observed affecting the deduced amino acid sequence among the three cDNA fragments. The amino acid sequence of the purified native Der f II protein could be analyzed to 45 residues from the N-terminus. As a result of comparison, all the three cDNA fragments code for a mature protein with a derived molecular weight of about 14,000. The amino acid sequence was not homologous to any known protein sequences and it contained six cysteine residues and no N-glycosylation sites.

Allergens↗
PubMed1991

[Visual impairment complicated with meningioma].

Among 106 patients of meningioma surgically experienced the past 10 years between 1981 and 1990, twelve of meningioma with progressive visual impairment were analyzed in relation to postoperative visual outcome. There were four males and eight females, and the age ranged from 33 to 61 years with the average 48 years. The distribution of tumor location was 6 cases in tuberculum sellae, 3 cases in the inner side of sphenoid ridge, and 3 cases in olfactory groove. The size of tumor in each case was 2 to 7 cm in diameter, and in 8 cases more than 3 cm. The duration of visual disturbance was between 3 months and 10 years with the average 3 years. For all cases, surgical removal of the tumor was performed totally by pterional and bifrontal approach. Consequently, 58.3% of 7 cases had improved vision postoperatively, 16.7% of 2 cases remained unchanged, and 25.0% of 3 cases were worse, including one case of malignant meningioma, Visual outcome was mainly affected by a duration of symptoms, a tumor size, a preoperative visual impairment, and in special, a situation of optic nerve where compression of tumor itself and adherence to the surrounding tissues took place. On operation, great care should be paid for a case of long-standing, severe visual disturbance as demonstrating hemianopsia with visual narrowing less than 50 degree by perimetry, and also for preservation of the feeding arteries of optic nerves.

Adult↗
PubMed1991

[Asbestos concentration and fiber size in lungs of the urban residents].

Asbestos fiber concentrations and fiber size distribution in lung tissues of 53 urban residents (males: 34, female: 19) were analyzed by low temperature ashing-analytical transmission electronmicroscopy. The following findings were obtained. 1. Pulmonary asbestos fibers were found in 51 out of 53 patients. The types of asbestos fibers were chrysotile, amosite, crocidolite, actinolite and tremolite. 2. Thirty-six of 53 patients had no history of occupational asbestos exposure, and their geometric mean concentration of asbestos fibers was 1.67 x 10(6) fibers/g dry lung. Most of these asbestos fibers are probably attributable to general environmental contamination. Thirteen patients who had a history of occupational asbestos exposure showed a geometric mean of their pulmonary asbestos concentrations (5.82 x 10(6) fibers/g dry lung) which was significantly higher than that of patients without occupational asbestos exposure (p less than 0.01). 3. The geometric mean concentration of asbestos fiber in males (2.70 x 10(6)) was higher than in females (1.59 x 10(6)), probably due to a difference in the occupational asbestos exposure between males and females. 4. Regardless of the patient's sex, the geometric mean concentration of asbestos fibers in patients without a history of smoking (male: 4.91 x 10(6), female: 1.78 x 10(6)) was higher than that in patients with a smoking history (male: 2.76 x 10(6), female: 1.37 x 10(6)). The difference, however, was not statistically significant, and no correlation was seen between the concentration of asbestos fibers and smoking history. 5. Although most asbestos fiber utilized in Japan is chrysotile, the geometric mean concentration of chrysotile (0.87 x 10(6)) was almost identical to that of amphibole asbestos fiber (0.90 x 10(6)). 6. Of the asbestos fibers observed, 95% of chrysotile and 85% of amphibole asbestos were less than 5 microns in length and 93% of the total asbestos fibers were too small to be visible by light microscopy.

Adult↗
PubMed1991

[A non-invasive quantitative measurement of cerebral blood flow using N-isopropyl-[123I]p-iodoamphetamine and single photon emission CT].

A non-invasive quantitative method using N-isopropyl-[123I]p-iodoamphetamine (IMP) was described for assessing regional cerebral blood flow (rCBF). Twenty four cases, composed of 11 patients with brain tumors, 9 patients having cerebrovascular disease and 4 other patients aged 15-73 years, all underwent the SPECT 133Xe inhalation method (Xe-SPECT) and IMP-SPECT using a Tomomatic 564. In the IMP-SPECT cases, 111-222 MBq (3-6 mCi) of IMP was injected intravenously and then sequential imaging was performed 9.5 +/- 1.2 (mean +/- SD) min (E1 image), 20.6 +/- 1.2 min (E2 image), 227.5 +/- 22.1 min (D1 image), and 236.6 +/- 22.4 min (D2 image) after the injection. The IMP-uptake value (counts/pixel/sampling time) in the region of interest (ROI), which was chosen in the non-affected cortex in the middle cerebral artery territory (MCAC), was counted on each image (E1 value, E2 value, D1 value and D2 value) and the E1/D1 ratios and E2/D2 ratios were consequently calculated. On the other hand, the absolute value of the ROIrCBF (Xe-rCBF) was obtained by Xe-SPECT. There were significant correlations noted between both the E1/D1 ratios and the E2/D2 ratios, and the Xe-rCBFs. Those correlation coefficients were found to be: r = 0.741 and 0.810 respectively. Based on this significant relationship, equations were deduced to involve the rCBF values by use of IMP-SPECT: y = Ax + B (y: rCBF, x: E1/D1 ratio (E2/D2 ratio), A = 52.8 (68.2), B = 6.3 (-14.9), where A and B indicate the slope and deviation of the regression line).(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed1991

Two differential pathways from double-negative to double-positive thymocytes.

Murine thymocytes are divided into four major populations on the basis of expression of CD4 and CD8 antigens. The bulk of evidence favours the view that CD4-CD8- cells can develop into CD4-CD8+ and CD4+CD8- cells via the CD4+CD8+ stage in the thymus. However, CD4-CD8+ and CD4+CD8- thymocyte subsets contain not only CD3+ mature cells but also CD3- immature cells, which seem to be intermediate cells between CD4-CD8- and CD4+CD8+ cells. Here we demonstrate mouse strain differences in the proportion of immature single-positive thymocyte subsets in thymus at the steady or developing state. In C3H mice, immature CD4+CD8- is dominant in proportion over CD4-CD8+ in foetal thymus and in donor-derived thymocytes at an early stage of bone marrow transplantation. On the other hand, immature CD4-CD8+ is dominant over CD4+CD8- during T-cell development in the case of B10.BR mice. An intermediate pattern was shown in the case of F1 mice. Both of these immature single-positive subsets gave rise to double-positive cells after 24 hr culture. These results suggest that there exist two distinct differential pathways; one is from CD4-CD8- cells to CD4+CD8+ cells via CD4-CD8+ cells, and another is via CD4+CD8- cells, and that an application of the 'CD8 pathway' or 'CD4 pathway' seems to be genetically destined by BM-derived cells but not by thymic stromal cells.

Animals↗
PubMed1991

Sequential appearance of T-cell receptor gamma delta- and alpha beta-bearing intestinal intra-epithelial lymphocytes in mice after irradiation.

We have previously reported that T-cell receptor (TcR) gamma delta-bearing T cells precede TcR alpha beta-bearing T cells in appearance in the thymus after whole-body irradiation. In the present study, the kinetics of appearance of intestinal intra-epithelial lymphocytes (IEL) was examined in mice after whole-body irradiation with a lethal dose of 9.5 Gy or with a sublethal dose of 6 Gy. The number of CD3+ IEL decreased to the lowest value 4 days after irradiation with 9.5 Gy, and thereafter increased to half as many as the normal level by day 7. Thy-1+TcR alpha beta- IEL and Thy-TcR alpha beta- IEL recovered considerably by day 7 after the irradiation, whereas Thy-1+TcR alpha beta+ IEL and Thy-1+TcR alpha beta+ IEL hardly recovered at this stage. All mice died within 12 days after irradiation with a lethal dose of 9.5 Gy. On the other hand, when irradiation dose was decreased to 6 Gy, all mice survived beyond 40 days after irradiation. The number of CD3+ IEL recovered to the normal level by 10 days after irradiation with 6 Gy. Consistently with the results in mice irradiated with a lethal dose, the first cells to increase in IEL of mice irradiated with a sublethal dose were TcR gamma delta+ IEL expressing Thy-1 antigen. The number of Thy-1+TcR gamma delta+ IEL increased to approximately two-fold as many as that in normal mice by day 10, while TcR alpha beta+ IEL began to increase in number from day 20 after irradiation and recovered to the normal level by day 40 after irradiation. Thus, sequential appearance of TcR gamma delta+ and TcR alpha beta+ IEL was evident after irradiation, similar to that seen in the thymus after irradiation. The IEL on day 10 after a sublethal irradiation, which is composed mainly of Thy-1+TcR gamma delta+ IEL, exhibited a strong cytolytic activity against P815 in the presence of anti-CD3 mAb, suggesting that the early appearing Thy-1+TcR gamma delta+ IEL may play important roles in epithelial immunity at an early stage after irradiation.

Animals↗
PubMed1991

The stage of negative selection in tolerance induction in neonatal mice.

In flow microfluorometry analysis of thymus and lymph node cells of C57BL/6(I-E-,Mlsb) mice rendered neonatally tolerant to (C57BL/6 x AKR/J)F1 (I-E+,Mlsb/a) lymphoid cells, both CD4+ and CD8+ cells showed a striking reduction in the number of V beta 6+ cells capable of recognizing Mlsa in the context of major histocompatibility complex (MHC) class II molecules, indicating that clonal deletion of V beta 6+ cells by Mlsa antigen occurs just at a stage of immature V beta 6lowCD4+CD8+ thymocytes. On the other hand, the number of V beta 11+ cells capable of recognizing I-E was markedly reduced in CD4+ cells, but CD8+ cells showed only partial (20%) reduction of such a population. The clonal deletion of V beta 11+ cells by I-E may begin at the transitional stage from V beta 11lowCD4+CD8+ to V beta 11highCD4+CD8- single-position cells, and V beta 11lowCD4+CD8+ cells differentiating to V beta 11highCD4-CD8+ cells seem to be resistant to clonal deletion. V beta 11+ T cells are also stimulated by staphylococcal enterotoxin A (SEA) irrespective of expression of CD4 or CD8. Nearly all of both V beta 11+CD4+ and V beta 11+CD8+ lymph node T cells were deleted by the injection of SEA every other day from birth. In their thymi, both V beta 11+CD4+CD8- and V beta 11+CD4-CD8+ single-positive thymocytes were deleted, and the proportion of V beta 11low thymocytes was lower than that of normal mice. The clonal deletion of V beta 11+ T cells by SEA injection occurs at a stage of immature V beta 11lowCD4+CD8+ double-positive thymocytes, resulting in deletion of both V beta 11+CD4+ and V beta 11+CD8+ T cells.

Animals↗
PubMed1991

[Cervical lung hernia in a case of severe chronic asthma and bronchitis].

A case of a bilateral pulmonary hernia of the lungs into the supraclavicular fossae is described. A man, aged 79, with severe chronic asthma and chronic bronchitis due to air pollution, complained of a cervical mass off and on for several years. The herniation was greater on the right side. It could be identified on physical examination by the presence of a soft painless supraclavicular bulge which was exaggerated by strain or cough. Radiologically this herniation could best be identified on lateral cervical roentgenogram. It is said that cervical lung hernia is a rare condition, but in our experience supraclavicular herniation of the lung is not unusual in cases of severe chronic obstructive lung disease.

Aged↗
PubMed1991

[Long-term follow-up results on Bentall's and our modified procedure].

Replacement of the ascending aorta and the aortic valve with composite graft, including reimplantation of coronary ostia, were performed in 84 patients from October, 1978 to December, 1989. Annuloaortic ectasia was the most common indication for surgery (76 patients). Thirty patients (36%) had the Marfan syndrome. Thirty-five patients were performed with original Bentall's procedure. Thirty patients were carried out with our modified technique like Inberg's, the coronary arteries were excised with attachment of the selected piece of the aortic wall, and implanted to the tube prosthesis with continuous suture. Nineteen patients were operated with modified technique by Cabrol or other interposition graft method. The actuarial free of death related to the operation of 4 years was 83%, 88%, and 74% (p = NS) in each methods respectively. The complications of anastomosis, for example, leakage and dilatation of coronary ostia were not seen in our modified Bentall's procedure. In conclusion, our modified method is proved to be reliable and competent.

Adult↗
PubMed1991

Preparation of specific monoclonal antibodies against Der f II one of the major allergens of Dermatophagoides farinae.

Five monoclonal antibodies (Mabs) against Der f II, one of the major allergens of Dermatophagoides farinae, were obtained from mice immunized with the allergen. Western blotting analysis revealed that only one Mab, named 15E11, was specific for Der f II, whereas the other Mabs crossreacted with Der p II, one of the major allergens of Dermatophagoides pteronyssinus. These results indicate the possibility that the Der f II-specific Mab, 15E11, is a useful reagent for specific determination of Der f II.

Allergens↗
PubMed1990

Fluorocarbon-encapsulated oxygen bubbles for blood oxygenation use: an experimental study.

This paper is concerned with a novel class of oxygenators which Li and Asher first proposed and called "liquid membrane oxygenators." They are different from usual bubble blood oxygenators in that oxygen bubbles are individually encapsulated by a liquid fluorocarbon membrane and dispersed in blood, instead of bare oxygen bubbles normally used. The fluorocarbon membrane's role is to prevent direct contact of blood with oxygen gas which can cause a rupture of red blood cells and denaturation of proteins in blood. We have attempted to produce encapsulated bubbles by use of a fine double-tube nozzle where oxygen is supplied through the inner tube of the nozzle while a liquid fluorocarbon is supplied through the annular space between the outer and the inner tubes. This device has been found to enable steady formation, both in pure water and in an aqueous solution of bovine serum albumin, of encapsulated bubbles of about 2 mm in diameter, which are far smaller than those produced by Li and Asher's original device. A comparative study of oxygenation of water (a substitute for blood) by encapsulated bubbles and by nonencapsulated bubbles indicates that the former is only slightly inferior to the latter.

Biocompatible Materials↗
PubMed1990

A guanine nucleotide-binding protein in human astrocytoma.

We compared, by immunoblotting and immunohistochemical staining, the distribution of the alpha subunit of Go in human normal brain tissue with that in human brain tumours of neuroectodermal origin. The ten tumour samples included seven high-grade astrocytomas (grades III and IV) and three low-grade astrocytomas (grade II). Immunoreactivity of high-grade astrocytomas with the alpha subunit of Go (Go alpha) antibody was lower than that of low-grade astrocytomas and normal white matter. In the immunohistochemical study, neoplastic cells in the astrocytomas were found to contain little or no significant Go alpha, although nonlesional white matter was strongly stained with Go alpha antibody. This study suggests that Go alpha antibody may assist in defining the boundary of an astrocytoma, and the difference in Go content may affect the alteration in the physical properties of the membrane, which exhibit, in part, the character of the transformation.

Astrocytoma↗
PubMed1990

Serum neuron-specific enolase as a marker of small-cell carcinoma of the esophagus.

We monitored the changes in serum neuron-specific enolase (NSE) level in two patients with esophageal small-cell carcinoma (SCC) during the course of treatment by chemotherapy or surgery, with radiation. Serum NSE levels at diagnosis were 18.5 and 58.0 ng/ml. In both cases, after treatment the serum NSE level decreased to within normal range (less than 10.0 ng/ml), concurrent with reduction in the size of the tumor. However, with relapse of the disease, the serum NSE increased to 24.3 and 200.0 ng/ml, respectively. One patient died of lung and skin metastases 4 months after surgery; the other, who developed brain metastasis, was treated again with chemotherapy by the same regimen. The serum NSE level decreased to 13.0 ng/ml, and the symptoms improved. These results indicate that there is a correlation between serum NSE level and remission or relapse of the disease after treatment in patients with SCC of the esophagus, as with SCC of the lung.

Aged↗