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T Kamei

Publications and source records attributed to T Kamei.

At least 145 records · Page 8Linked to original sources
PubMed1994

[The influence of ulinastatin on renal function during anesthesia for renal transplantation].

The purpose of this study was to evaluate the influence of ulinastatin (UST) on renal function and changes in granulocyte elastase during anesthesia in 10 living related and 10 cadaveric renal transplantations. UST (300,000 units) was administered after the induction of anesthesia and renal vessel anastomosis, respectively. The living patients who received UST had greater urine volume during the operative and postoperative periods. In addition, the granulocyte elastase values of these patients showed relative suppressive changes during the intraoperative and postoperative periods. In cadaveric renal transplant patients, UST did not influence serum BUN or creatinine, although urine volume was greater in the UST-treated patients than in the patients who did not receive. We could not conclude that the intraoperative administration of UST affected the renal function of renal transplants, but we did find that UST is useful to suppress granulocyte elastase which is concerned with the index of stress or inflammation. It is necessary to investigate further the method of administration of UST for renal transplantation.

Adult↗
PubMed1993

[MR evaluation of common femoral arterial flow: age-related changes and characteristics in obstructive arterial disease of lower extremities].

Flow velocity measurements of the common femoral arteries in 60 lower extremities of 30 healthy subjects and 12 lower extremities of 7 patients with arteriosclerosis obliterans (ASO) were performed by means of magnetic resonance imaging with a use of presaturation bolus tracking (PBT) method. Our PBT method can provide both precise determination of flow velocity and evaluation of flow patterns within 30 minutes in the clinical setting. In phantom study, MR flow velocity had good correlation with actual flow velocity (r = 0.997). 30 healthy volunteers were classified into three groups; group I (20-40 years), group II (41-60 years) and group III (61-80 years). Starting time of acceleration (STA) were shortened as the age progressed. Peak reverse velocity (PRV), maximum deceleration rate (MDR), peak forward velocity/mean velocity ratio (PFV/MV) and pulsatility index (PI) were significantly decreased in group III as compared to group I and group II. Although intraluminal flow profile showed almost uniform during acceleration time on MR images, flow profile became disproportioned and reverse flow was observed in the medial portion during deceleration time. These characteristic hemodynamics were recognized in all healthy subjects regardless to the different age group. In ASO, STA was prolonged and PFV, PRV, Maximum acceleration rate, MDR, PFV/MV, PI, Vascular sectional area, flow volume were significantly decreased (p < 0.001) as compared to the control healthy group III. As the result we obtained marked characteristics such as flattening of curves and disappearance of reverse flow in MR flow waveform. On MR images, disproportion of intraluminal flow profile, decreased flow velocities during acceleration time and disappearance of reverse flow (11 of 12 extremities) during deceleration time were observed.

Adult↗
PubMed1993

Effects of NB-598, a potent squalene epoxidase inhibitor, on the apical membrane uptake of cholesterol and basolateral membrane secretion of lipids in Caco-2 cells.

Caco-2 cells grown on membrane filters were used as a model to study the effects of NB-598, an inhibitor of squalene epoxidase, on cholesterol absorption from the intestinal epithelia. NB-598 (10 microM) inhibited the synthesis of sterol and sterol ester from [14C]acetate without affecting the synthesis of other lipids such as phospholipids (PL), free fatty acids (FFA) and triacylglycerol (TG). When labeled lipid was apically loaded as a micellar lipid solution into Caco-2 cell cultures, NB-598 reduced basolaterally secreted radioactivity in cholesterol, cholesterol ester, PL and TG. Furthermore, NB-598 suppressed the basolateral secretion of apolipoprotein (apo) B. When microsomes prepared from control Caco-2 cells were incubated with 10 microM NB-598, acyl CoA:cholesterol acyltransferase (ACAT) activity was inhibited slightly. After incubating Caco-2 cells with 10 microM NB-598, a slight reduction in cellular ACAT activity was also observed. These results suggest that suppression of the secretion of particles containing apo B and reduction of cellular ACAT activity in the intestinal epithelia are part of the mechanism of the cholesterol-lowering effect of NB-598.

Anticholesteremic Agents↗
PubMed1993

An inhibitor of squalene epoxidase, NB-598, suppresses the secretion of cholesterol and triacylglycerol and simultaneously reduces apolipoprotein B in HepG2 cells.

NB-598, a specific inhibitor of squalene epoxidase, suppressed the secretion of cholesterol and triacylglycerol from HepG2 cells into the medium. L-654,969, an inhibitor of 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase, inhibited the secretion of cholesterol as potently as NB-598, but did not suppress the secretion of triacylglycerol. Both compounds decreased the intracellular cholesterol content almost equally, and neither of the compounds reduced the intracellular triacylglycerol content. The suppression of lipid secretion by NB-598 was associated with a significant reduction in apolipoprotein (apo) B secretion into the medium. Therefore, the suppression of lipid secretion by NB-598 may be caused by a reduction in the number of triacylglycerol-rich lipoprotein particles. In contrast, the suppression of cholesterol secretion by L-654,969 may be due to a modulation of lipoprotein lipid composition, since this agent did not reduce the secretion of apo B or triacylglycerol. The secretion of apo A-I was unaffected by either NB-598 or L-654,969. Pulse chase studies using [35S]methionine showed that the suppression of apo B secretion by NB-598 depended on an enhancement of intracellular degradation of apo B. These results indicate that the secretion of apo B from HepG2 cells is not regulated by the lipid synthesis alone, and suggest that the mechanism of the hypolipidemic effect of NB-598 involves the suppression of triacylglycerol-rich lipoprotein secretion from the liver as well as an inhibition of cholesterol synthesis in the liver.

Anticholesteremic Agents↗
PubMed1993

Experimental study of the therapeutic effects of folate, vitamin A, and vitamin B12 on squamous metaplasia of the bronchial epithelium.

BACKGROUND: Vitamin deficiency may be related to carcinogenesis. Cytologic examinations of sputum have already found that the administration of folate and vitamin B12 suppressed the development of squamous metaplasia and atypia in smokers' airways. The authors investigated the effect of folic acid, vitamin B12, and vitamin A on the formation of metaplasia and hyperplasia in methylcholanthrene (MCA)-treated rats. METHODS: The SD strain of rats received 10 mg of MCA intratracheally and was divided into six groups as follows: (1) vitamin A; (2) folic acid; (3) vitamin B12; (4) vitamin B12 with folic acid; (5) a combination of vitamin A, folic acid, and vitamin B12; and (6) no vitamins. The Lower respiratory tract epithelia of the rats were examined histologically 20, 32, and 36 weeks after MCA administration and at the end of the experiment. RESULTS: A clear difference was detected between the group receiving folic acid and that receiving vitamin A. In the former group, metaplasia was found in only one rat, atypia was not found, and hyperplasia with marked changes was present in less than 50% of other groups. In the latter group, atypia was found in all of the metaplastic foci. CONCLUSIONS: It was suggested that the epithelial hyperplasia and metaplasia of respiratory tract induced by MCA can be suppressed by the administration of folic acid.

Animals↗
PubMed1993

Colloid liver SPECT of hepatic alveolar echinococcosis.

Seventy-one-year-old man had a liver mass. He lived in Hokkaido, where there is an epidemic of hydatic disease. Abdominal US image showed an echogenic mass. CT revealed a low density mass with an unclear margin. A 99mTc-Sulfur colloid liver SPECT study was performed to detect the liver mass. The SPECT scan was done after intravenous administration of 5 mCi of 99mTc-sulfur colloid, and it revealed a lack of uptake in the liver mass. The liver SPECT findings were correlated with subsequent CT and US imaging. Echo-guided biopsy showed a PAS-positive cuticle layer of echinococcosis in the necrotic tissue. This is the first report of a case of detection of hepatic alveolar echinococcosis by means of a colloid liver SPECT imaging procedure.

Aged↗
PubMed1993

Diabetogenic effects of FK506 on renal subcapsular islet isografts in rat.

Previously we demonstrated prevention of immune rejection in rat islet allografts by continuous subcutaneous (s.c.) administration of FK506 and also showed that FK506 might have diabetogenic effects (Ryu and Yasunami (1991) Transplantation, 52, 599-605). The purpose of the present study was to characterize further diabetogenic effects of FK506 on renal subcapsular islet isografts in rat. Continuous s.c. administration of FK506 (3 mg/kg/day) for 35 days produced glucose intolerance in the recipients as demonstrated by intravenous (i.v.) glucose tolerance test at the end (35 days) and after discontinuation (90 days) of FK506 administration. Morphologically, beta cells in the grafts of FK506-treated group were degranulated at 35 and 120 days after transplantation. Electron microscopically, degranulation, marked swelling of rough endoplasmic reticulum, Golgi apparatus and mitochondria were detected in beta cells of the grafts treated with FK506 at 35 days, and at 120 days there was moderate structural recovery in the organella. These findings clearly demonstrate that FK506 has diabetogenic effects on renal subcapsular islet isografts in rat and also suggests potential reversibility of damages by FK506 in beta cells of the grafts.

Animals↗
PubMed1993

Simultaneous measurements of twenty-four-hour whole-body retention of 47Ca-chloride and 99mTc-MDP: early differentiation of metabolic bone diseases in rat models.

The 24-h whole-body retention (24-h WBR) of 47Ca-chloride and 99mTc-MDP was measured in four rat models over a 6-week period at 2 week intervals. Fine detail bone radiographs of the femurs and histologic bone specimens were also obtained simultaneously. In the osteomalacic (M) and steroid-induced osteoporotic (S) groups the 24-h WBR values of 47Ca were significantly lower, and in the osteoporotic (P) group were higher than in the control (C) group from the second week. The 24-h WBR values of 99mTc-MDP were significantly higher in the M group and were lower in the S group from the second week. Simultaneous measurements of 24-h WBR of these two radiopharmaceuticals facilitated the early differentiation of metabolic bone diseases in the animal models prior to the detection of radiologic bone changes.

Animals↗
PubMed1993

Two cases of nasopharyngeal branchial cyst.

Two cases of nasopharyngeal cyst, in a two-year-old girl and a six-year-old boy, are described. The cysts were located in the right lateral wall of the nasopharynx in both cases. Histopathological examinations revealed that the cyst walls were lined with columnar epithelium. The positions of the cysts and pathological features indicated that they were of branchial origin, and they were assumed to originate in the second branchial pouch because of their anatomic location. They differed from previously reported cases in that they extended nearly to the base of the skull, occupying the parapharyngeal space. It was considered that they might have originated from the dorsal part of the second branchial pouch or the layer of endodermal cells cut off from the lower part of the eustachian tube.

Branchioma↗
PubMed1993

Modulation of the kinetics of the initial leukocyte migration into renal allografts by 16,16-dimethyl PGE2.

Host sensitization to vascular allografts is induced by the interaction between host lymphocytes, antigen-presenting cells, and the allograft. However, little is known concerning the nature or kinetics of the initial host leukocyte migration into the transplanted organ prior to immune sensitization. Employing a model of donor-irradiated renal allografts and isografts, we have characterized the participating cell types and the kinetics of the leukocyte influx during the first 96 hr after engraftment. Both isografts and allografts experience a marked initial influx of host leukocytes into the renal interstitium, peaking at 48 hr after transplantation. Concomitant glomerular accumulation of leukocytes is much less marked. By 96 hr, the leukocyte influx into isografts has significantly diminished, while allografts demonstrate a subsequent additional rise in interstitial leukocytes coincident with the development of allosensitization. In allografts, the predominant cell type in the influx of the first 24-48 hr of the leukocyte influx is the monocyte/macrophage, with a smaller component of T lymphocytes. Neutrophils and B lymphocytes are not found in this initial infiltrate. Intragraft infusion of dimethyl PGE2 markedly inhibits the monocyte influx during the first 24-48 hr into the renal interstitium, but not the glomeruli, of allografts, while having relatively little effect on the migration of leukocytes into the renal glomerulus or renal interstitium of isografts. The results suggest that one mechanism by which PGE may inhibit host sensitization to allografts may be suppression of the initial influx of donor monocytes into the newly allografted organ.

16,16-Dimethylprostaglandin E2↗
PubMed1993

Increased granulocyte/macrophage colony-stimulating factor production by mononuclear cells from peripheral blood of patients with bronchial asthma.

The in vitro production of granulocyte/macrophage colony-stimulating factor (GM-CSF) by mononuclear cells (MNC) from the peripheral blood of patients with bronchial asthma (BA) was examined by enzyme-linked immunosorbent assay (ELISA). GM-CSF concentrations in the media of MNC from patients with BA cultured with interleukin-2 (IL-2) was 80.2 +/- 52.0 pg/ml (mean +/- SE, n = 12), and that in cultures without a stimulant was 12.1 +/- 11.3 pg/ml. The GM-CSF concentrations in the media of MNC from patients with other diseases (n = 13) and from healthy volunteers (n = 6) cultured with or without IL-2 were less than 7.5 pg/ml (the minimum detectable value). The culture media of MNC from patients with BA demonstrated activities for stimulating the proliferation and survival of eosinophils, and these activities were partially inhibited by anti-GM-CSF antibodies. GM-CSF production by MNC of patients with BA treated with glucocorticoids was lower than that of MNC from untreated patients with BA, and it was inhibited by coculture with glucocorticoids in vitro. These results suggest that GM-CSF production by MNC is increased in patients with BA, is modulated by glucocorticoids, and may play an important role in the pathogenesis of BA.

Adult↗
PubMed1993

Factors that stimulate the proliferation and survival of eosinophils in eosinophilic pleural effusion: relationship to granulocyte/macrophage colony-stimulating factor, interleukin-5, and interleukin-3.

To investigate the mechanism of eosinophilia in patients with eosinophilic pleural effusions, we measured the activities of eosinophil colony-stimulating factor (Eo-CSF) and stimulating factor for eosinophil survival in the eosinophilic pleural fluids of six patients (two with tuberculous pleuritis, two with drug allergy, and one each with chronic eosinophilic pneumonia and pleuritis associated with rheumatoid arthritis). The number of eosinophil colonies formed by the pleural fluid of patients with eosinophilic pleural effusions significantly exceeded that of control patients with noneosinophilic pleural effusions (7.5 +/- 1.9 colonies/10(5) bone marrow cells, n = 6, versus 0.3 +/- 0.1 colonies/10(5) bone marrow cells, n = 6, P < 0.01). Similarly, eosinophil survival evaluated on day 4 of culture with pleural fluid of patients with eosinophilic pleural effusions significantly exceeded that of patients with noneosinophilic pleural effusions (83.9 +/- 9.8% versus 46.1 +/- 11.2%, P < 0.001). Both activities were inhibited mainly by anti-IL-5 antibody and partially by anti-GM-CSF antibody and anti-IL-3 antibody. Mononuclear cells obtained from eosinophilic pleural fluid released the activities of Eo-CSF and stimulating factor for eosinophil survival in vitro. These findings suggest that GM-CSF, IL-5, and IL-3 are important to eosinophil accumulation in pleural cavity as stimulators of proliferation and survival of eosinophils.

Adult↗
PubMed1993

Production of interleukin-5 and granulocyte/macrophage colony-stimulating factor by T cells of patients with bronchial asthma in response to Dermatophagoides farinae and its relation to eosinophil colony-stimulating factor.

We investigated the effects of Dermatophagoides farinae (Df) and interleukin (IL)-2 on the release of eosinophil colony-stimulating factor (Eo-CSF) activity from mononuclear cells (MNC) and lymphocytes of patients with bronchial asthma (BA) who were sensitive to Df to clarify its relationship with IL-5 and granulocyte/macrophage colony-stimulating factor (GM-CSF). MNC and T cells of patients cultured with IL-2 and Df released Eo-CSF activity. These Eo-CSF activities were partially inhibited by anti-IL-5 and anti-GM-CSF antibodies. In 11 of 15 cases studied, MNC from patients produced GM-CSF in response to IL-2. In four of 15 cases studied, MNC from patients produced GM-CSF in response to Df. On culture with IL-2 or Df, the releases of IL-5 into the medium by MNC from individual patients varied. The results indicate that in BA responsiveness of lymphocytes to Df is increased, and suggest that IL-5 and GM-CSF produced by T cells play a role in the induction of eosinophilia and the pathogenesis of BA.

Animals↗
PubMed1993

Enzymatic properties of squalene epoxidase from Saccharomyces cerevisiae.

Squalene epoxidase is a microsomal membrane-associated enzyme that acts as an important regulator in the sterol biosynthetic pathway. In this study, the enzymatic properties of squalene epoxidase from Saccharomyces cerevisiae were examined. Unlike Candida squalene epoxidase, S. cerevisiae squalene epoxidase required NADPH for enzyme reaction. However, S. cerevisiae enzyme reaction did not require FAD or autologous S105 fraction. Unlike rat squalene epoxidase, the activity of S. cerevisiae was reduced by Triton X-100, a nonionic detergent. Terbinafine, an inhibitor of fungal squalene epoxidase, inhibited the enzyme in a non-competitive manner, while NB-598, an inhibitor of mammalian squalene epoxidase, barely inhibited it in a partially non-competitive manner. Thus, the properties of squalene epoxidase from S. cerevisiae were different from those of squalene epoxidase from rats and Candida, which were previously known. We propose that a species difference of squalene epoxidase exists not only between animals and fungi but between Candida and Saccharomyces.

Animals↗
PubMed1993

[Statistical observations of clinical cases with frontal, ethmoid and sphenoid sinus mucoceles].

Ninety six patients with paranasal mucoceles (or pyoceles) were admitted and treated at Gunma University Hospital from 1977 to 1986 (age range 15-82 years; mean 46.4 years). We statistically investigated these cases paying a special attention to 25 patients with visual disturbance. 1) In 71 cases mucocele was located in the frontal or fronto-ethmoid sinus (FE group), in 12 it was found in the ethmoid sinus (E group), and in 13 it was situated in the sphenoid or spheno-ethmoid sinus (SE group). 2) Sixty three cases had histories of previous surgery of paranasal sinuses and 29 cases were considered to have primary mucoceles. 3) The mean age of patients with primary mucocele was 56.4, while that with postoperative mucocele was 41.2. 4) In the FE group recurrence was so frequent that some device for surgical treatment should be considered (i.e., mucous membrane grafting, prolonged insertion of silicon tubes). 5) Visual disturbance was frequently observed in both the E group (7/12) and the SE group (9/13). 6) Visual disturbance may occur when mucocele compress the optic nerve and the globe at retrobulbar portion as well as at the optic canal. Twelve cases out of 25 with visual disturbance belonged in the former type. 7) Optic atrophy was most commonly seen in the SE group, but was recognized in 1 case even in the E group and the FE group respectively. 8) In patients with sudden visual disturbance, if only they were operated within a week after the onset, their visual acuity was remarkably improved except for serious cases. 9) In the cases presented with gradually attacked or varying visual disturbance, there was no correlation between the recovery of the vision and the duration of the disturbance.

Adolescent↗
PubMed1993

[Production and inhibition of eosinophil colony stimulating factor by lymphocytes from patients with bronchial asthma].

To clarify the mechanism of the eosinophilia in patients with bronchial asthma (BA), we examined the production and inhibition of eosinophil colony stimulating factor (Eo-CSF) of mononuclear cells (MNC) and lymphocytes from BA. After bone marrow cells from normal volunteers (NA) were incubated with culture media of MNC or lymphocytes cultured in the presence of interleukin-2 (IL-2, 1 U/ml) or Dermatophagoides farinae (10 micrograms/ml, Df), the number of eosinophils was increased and GM-CSF production was increased after 5 days of culture. Interleukin 5 (IL-5) production was increased in some cases of BA, but did not differ between BA and NA delete. When MNC were incubated in the presence of IL-2 and interleukin 4 (IL-4), neither eosinophilia nor GM-CSF production occurred. These results suggest first that MNC and T cells in BA have increased responsiveness to IL-2 and Df, second that increased GM-CSF production partly causes eosinophilia, and third that IL-4 inhibited IL-2-induced eosinophil proliferation by inhibition of GM-CSF production.

Adult↗
PubMed1993

[Evaluation of the elastase burden in patients with idiopathic interstitial pneumonia].

This study was designed to clarify the role of neutrophil elastase in the pathogenesis of idiopathic interstitial pneumonia (IIP). To accomplish this, elastase: alpha 1-antitrypsin complexes in plasma and bronchoalveolar lavage fluids (BALF) were measured in 19 patients with IIP and compared to 15 normal smokers. Cell differentiation counts showed that there was no difference in percent neutrophils in BALF between IIP patients and normal smokers. However, elastase: alpha 1-antitrypsin complexes were significantly increased in both plasma and BALF in patients with IIP compared to normal smokers. In IIP patients with honeycombing demonstrated by high resolution CT, although elastase: alpha 1-antitrypsin complexes were not significantly increased in plasma, elastase: alpha-antitrypsin complexes in BALF were significantly increased compared to IIP patients without honeycombing. Western immunoblot analysis showed that although the native 80-KD elastase: alpha-antitrypsin complex was detected in BALF, the molecular weight of elastase: alpha 1-antitrypsin complex in plasma was 60-KD.

Aged↗