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Biomedical subjects

M Takeuchi

Publications and source records attributed to M Takeuchi.

At least 721 records · Page 40Linked to original sources
PubMed1990

Fibronectin on prosthetic denture fabrication.

It is well known that fibronectin adheres to various oral bacteria and shows affinity to various components. Thus the existence fibronectin which is present in the salivary flow, acquired pellicle and dental plaque, was investigated in used acrylic resin dentures with a direct immunohistochemical fluorescent technique using antihuman fibronectin goat serum which was labeled with fluorescein isothiocyanate (FITC). It was found that fibronectin frequently was present on the surface of acrylic resin dentures.

Acrylic Resins↗
PubMed1990

[A case of inorganic germanium poisoning with peripheral and cranial neuropathy, myopathy and autonomic dysfunction].

A 51-year-old man, taking beverage containing inorganic germanium (Ge), (90-100 mg/day, total 70 g) for two years, developed body weight loss, anemia, renal dysfunction, peripheral neuropathy, myopathy, autonomic dysfunctions and multiple cranial nerve palsies. Serum CK, GOT, LDH, BUN, and creatinine levels were elevated. The cerebrospinal fluid showed albumino-cytologic dissociation. Sural nerve biopsy showed axonal degeneration, and peroneal muscle biopsy showed neurogenic changes including type 2 fiber atrophy and ragged red fibers. High level of Ge content was detected from the hair and nail by inductively coupled plasma atomic emission spectrometry. Despite discontinuation of Ge taking, the peripheral neuropathy and autonomic dysfunction progressed. The symptoms remained unchanged even in the treatment with prednisolone. These findings suggest that inorganic Ge has a serious irreversible multiple system toxicity.

Autonomic Nervous System Diseases↗
PubMed1990

[Increased oxidant production by peripheral blood granulocytes in patients with idiopathic pulmonary fibrosis].

Oxidant production by peripheral granulocytes stimulated with phorbol myristate acetate (PMA) was investigated in 11 patients with idiopathic pulmonary fibrosis (IPF), 6 with interstitial pneumonia associated with collagen vascular disease (IP-CVD), 8 with sarcoidosis and 12 healthy subjects. Oxidant production was examined by flow cytometry using dichlorofluorescein diacetate. The reactivity of granulocytes to PMA was assessed according to the ratio between mean fluorescent intensity of granulocytes stimulated maximally with PMA and that without PMA, (stimulation index: S.I.). The concentration of PMA that induced half maximal fluorescent intensity of granulocytes (PC 1/2 max) was used as the index of sensitivity. The S.I. was 7.2 +/- 0.45 in IPF, 6.3 +/- 0.6 in IP-CVD, 6.0 +/- 0.71 in sarcoidosis, and 5.8 +/- 0.2 in healthy subjects. However differences between groups were not significant. PC 1/2 max was 7.3 +/- 2.1 ng/ml in IPF, 9.1 +/- 3.0 ng/ml in IP-CVD, 12 +/- 6.9 ng/ml in sarcoidosis and 16.1 +/- 5.8 ng/ml in healthy subjects. There was significant difference between IPF and healthy subjects (p less than 0.05) indicating that peripheral granulocytes in patients with IPF are more highly sensitive to PMA than healthy subjects.

Adult↗
PubMed1990

[A comparative clinical trial of UFT medication and intravesical BCG in the recurrence of superficial bladder cancer. Study Group of UFT and BCG adjuvant therapy for bladder cancer].

In sixty-four patients who had TUR-bt for superficial bladder cancer, the effect of intravesical BCG and UFT medication were compared. Group A (n = 20) were treated with BCG, group B (n = 22) were treated with UFT and group C (n = 22) were treated with both agents. The patients were followed up for more than 12 months by cystoscopy at a interval of 3 months, urinary cytology and bladder cold cup biopsy, if necessary. Thirteen of the 20 patients in group A and 13 of the 22 patients in group B were free of tumors, compared to 5 of the 22 patients in group C. Although the recurrence-free-rate in each group does not differ significantly, the combination therapy of intravesical BCG and UFT medication seems to decrease the rate of tumor recurrence for superficial bladder cancer. Side effects of BCG and UFT were tolerated well.

Administration, Intravesical↗
PubMed1990

[Silent myocardial ischemia in diabetics--by treadmill exercise testing].

We examined silent myocardial ischemia in diabetics by treadmill exercise testing. There were 28 diabetic men and 64 diabetic woman without angina, with a mean age of 59 +/- 11 years. Symptom-limited treadmill exercise testing was performed, and we used the electrocardiogram during exercise and immediately after exercise for judgement. ST segment depression was defined as positive if there was at least 0.1 mV of ST depression 80 ms from the J point. It was defined as negative if max heart rate (HR) was more than 80% of target HR and there was no significant ST depression. It was defined as equivocal if there was no significant ST depression but max HR was less than 80% of target HR. In 92 diabetics, 21 patients (23%) showed positive ST depression, 35 (38%) showed negative ST depression, 36 (39%) showed equivocal ST depression. In 56 diabetics exclusive of treadmill equivocal patients, 38% of patients showed positive ST depression. Treadmill positive diabetics had a significantly higher rate of smokers, patients with hypertension, and a higher triglyceride level as compared with treadmill negative diabetics. Coronary arteriography, which was performed in six treadmill positive diabetics, revealed coronary stenosis of more than 75% in four patients.

Adult↗
PubMed1990

[Pigmented spindle cell nevus and pigmented Spitz nevus--clinical and histopathological study on pigmented Spitz nevus, and its differentiation from early melanoma by fluorescence method and measurement of 5-S-CD level in the lesion].

On the basis of clinical and histopathological studies on 17 patients who had been diagnosed as having pigmented Spitz nevus (PSN), pigmented spindle cell nevus (PSCN) was surmised to be a type of pigmented Spitz nevus. In order to distinguish pigmented spindle cell nevus and pigmented Spitz nevus from early melanoma, 5 PSCN cases and 12 PSN cases were analyzed by the fine-needle aspiration fluorescence method, touch fluorescence method and measurement of the 5-S-CD level in the lesion. With the touch fluorescence method, fluorescent tumor cells were detected in one case of PSN. With the fine-needle aspiration fluorescence method, fluorescent tumor cells were detected in one PSCN case and 2 PSN cases. In comparison with fluorescent melanoma cells, the detected fluorescent tumor cells were smaller in size and number and resembled melanocytes. The 5-S-CD level in the lesion was 50 ng/mg or less in all cases, whereas the level in melanoma is known to be a high 100 ng/mg or more. In the final analysis, measurement of the 5-S-CD level in the lesion was concluded to have the greatest utility for differential diagnosis of pigmented spindle cell nevus and pigmented Spitz nevus from early melanoma.

Adolescent↗
PubMed1990

[Clinical evaluation of coronary artery fistula and coronary artery-cardiac chamber shunt].

Coronary artery fistula and coronary artery-cardiac chamber shunts were observed in 16 cases out of 462 consecutive cases in which coronary angiography was performed. 9 of these cases had coronary artery fistula, 5 of the cases had coronary artery-cardiac chamber shunts. 2 cases had both of these conditions. Coronary artery fistula has a draining vein originating from the coronary artery and an entering vein terminating in the cardiac chamber or the pulmonary artery. Coronary artery-cardiac chamber shunts have no such veins, and contrast material used in the injection phase of coronary angiography escapes directly into the cardiac chamber. 2 cases of coronary artery fistula, 2 cases of coronary artery-cardiac chamber shunts, and 1 case involving the both of these conditions showed positive results in submaximal exercise tolerance tests, and no significant arteriosclerotic changes in the coronary artery. These factors lead us to suggest that coronary artery-cardiac chamber shunts cause cardiac ischemia for the same reason that coronary artery fistula does.

Adult↗
PubMed1989

Oxygen delivery, oxygen consumption and hemoglobin-oxygen affinity in acute myocardial infarction.

The interrelations of oxygen delivery (DO2), oxygen consumption (VO2) and hemoglobin-oxygen affinity assessed by P50 were investigated in 43 patients with acute myocardial infarction. As DO2 declined due to low cardiac output, a significant decrease in VO2 (r = 0.75, p less than 0.001) and a significant increase in P50 (r = -0.74, p less than 0.001) were observed. In the DO2 range between 300 and 450 ml/min/m2, in which the DO2 of 32 survivors and 11 nonsurvivors overlapped, the P50 of nonsurvivors was significantly higher than that of survivors (31.5 +/- 1.6 vs 27.9 +/- 1.5 torr, p less than 0.001), but there were no significant differences in any other oxygen transport variable. As a result of differences in P50, VO2 in this range was significantly higher in nonsurvivors compared to survivors (169 +/- 17 vs 148 +/- 13 ml/min/m2, p less than 0.001). These data suggest that a normal or increased VO2 alone does not ensure survival in patients with acute myocardial infarction, and increased P50 leads to an increase in VO2. Nevertheless, the interpretation of an increased P50 in patients with acute myocardial infarction must be made with caution, even with adequate DO2 and VO2, because it may imply a precarious oxygen transport/requirement balance in peripheral tissue and, hence, a fatal outcome.

Aged↗
PubMed1989

Doppler echography for hemodynamic studies of the azygos vein.

Using a convex array transducer, the advantages and shortcomings of transesophageal real-time two-dimensional Doppler echography (TE2DD) were assessed in a study of the vessels around the esophagus and the stomach in 67 adult patients with (n = 56) or without (n = 11) liver cirrhosis. In most cases, all but the upper- and lowermost margins of the azygos vein could be visualized. The more caudally the portion located, the smaller its diameter and flow velocity became. The average number of intercostal veins visualized by TE2DD was 4 per person. The observable esophagogastric varices seemed to be limited to deeply located ones around the esophagogastric junction. In five patients who had undergone distal splenorenal shunt, splenic venous flow, or shunt flow could be seen from the stomach over a length of about 5 cm. The azygos venous flow in cirrhotic patients was significantly greater than that of patients without cirrhosis. TE2DD appears to be very useful for evaluating flow in the cephalad collateral veins and other vessels around the esophagus and the stomach.

Adult↗
PubMed1989

Micronucleus test with methyl methanesulfonate administered by intraperitoneal injection and oral gavage.

The effects of 2 routes of administration, intraperitoneal injection (i.p.) and oral gavage (p.o.), in the micronucleus test were evaluated using methyl methanesulfonate (MMS) and 2 strains of mice (MS/Ae and CD-1). A small-scale acute toxicity study and a pilot micronucleus experiment were carried out first. On the basis of the results obtained, a final micronucleus test was performed at doses of 20, 40, 80, and 160 mg/kg (i.p.) and 40, 80, 160, and 320 mg/kg (p.o.), with a 24-h sampling time. MMS induced micronucleated polychromatic erythrocytes (MNPCEs) in both routes in both mouse strains under the conditions used. At 40 and 80 mg/kg, MMS induced a higher number of MNPCEs by the i.p. route in both strains. A 160 mg/kg MMS dose induced higher numbers of MNPCEs by the p.o. route in MS/Ae mice. The route-related difference with MMS on the basis of mg/kg disappeared when the difference was determined on the basis of a ratio of the LD50. In practice, both i.p. and p.o. routes are acceptable as routes of administration in the micronucleus test using this chemical.

Administration, Oral↗
PubMed1989

Benign prostatic hyperplasia in a patient castrated in his youth.

We report a case of benign prostatic hyperplasia in a 60-year-old patient who had been castrated when he was 30 years old. The prostatic tissue, which consisted of cystic and fibromuscular hyperplasia, contained no significant concentration of androgen receptors. Only 1 such case was reported previously in the literature.

Age Factors↗
PubMed1989

Solubility of uric acid and supersaturation of monosodium urate: why is uric acid so highly soluble in urine?

The solubility of uric acid and the stability of supersaturation of monosodium urate (NaU) were studied in buffer solutions containing 150 mM sodium in the physiological urinary pH range at 37C. The solubility of uric acid increased with the rise in pH, and the total dissolved urate (undissociated uric acid + urate anion) concentration did not change during seven-day incubation in the pH range below 6.6. In this pH range, the calculated concentration of undissociated uric acid was constant (about six mg./dl.). Consequently, the increasing solubility of uric acid with the rise in pH depended solely on the increase of urate anion. As much as 220 mg./dl. of uric acid could be dissolved for 24 hours at pH 7.0. But following seven-day incubation the total dissolved urate concentration decreased to 16 mg./dl. due to NaU crystallization. The stability of NaU supersaturation depended not only on the concentration of sodium and urate anion but also on time and pH. When monopotassium urate crystals were incubated for seven days, the total dissolved urate concentration decreased according to NaU crystallization; the higher the pH, the more marked the decrease. However, at least some 80 mg./dl. of total dissolved urate was stable up to pH 8.2 within 24 hours. These findings can well explain why NaU crystals are seldom formed in the normal urine. Urinary stasis and/or pathological high urinary pH may cause NaU crystallization.

Buffers↗
PubMed1989

Relationship between sugar chain structure and biological activity of recombinant human erythropoietin produced in Chinese hamster ovary cells.

Two forms of erythropoietin, EPO-bi and EPO-tetra, with different biological activities were isolated from the culture medium of a recombinant Chinese hamster ovary cell line, B8-300, into which the human erythropoietin gene had been introduced. EPO-bi, an unusual form, showed only one-seventh the in vivo activity and 3 times higher in vitro activity of the previously described recombinant human EPO (standard EPO). In contrast, EPO-tetra showed both in vivo and in vitro activities comparable to those of the standard EPO. EPO-bi, EPO-tetra, and the standard EPO had the same amino acid composition and immunoreactivity. However, structural analyses of their N-linked sugar chains revealed that EPO-bi contains the biantennary complex type as the major sugar chain, while EPO-tetra and the standard EPO contain the tetraantennary complex type as the major sugar chain. From examination of various preparations of recombinant human EPO, we found a positive correlation between the in vivo activity of EPO and the ratio of tetraantennary to biantennary oligosaccharides. These results suggest that higher branching of the N-linked sugar chains is essential for effective expression of in vivo biological activity of EPO.

Animals↗
PubMed1989

Effect of chemical constituents from plants on 12-O-tetradecanoylphorbol-13-acetate-induced inflammation in mice.

The induction of edema in the mouse ear has been established as a reliable in vivo assay for tumor promoters. Therefore, inhibitors of 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced ear edema are most likely to be inhibitors of skin tumor promotion. Besides the application for this assay for the screening of compounds, it also allows comparison of the activities of groups of related compounds such as flavonoids. Results obtained in this way showed that the double bond at C-2 and C-3 of the flavonoid structure is a prerequisite for anti-tumor-promoting activity, and indicated that activity in this screening assay for inhibitors of TPA-induced ear edema reflects the anti-tumor-promoting effect in two-stage carcinogenesis.

Animals↗