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Biomedical subjects

K Satoh

Publications and source records attributed to K Satoh.

At least 829 records · Page 46Linked to original sources
PubMed1991

[Drug induced hepatitis following sevoflurane anesthesia in a child].

A new volatile anesthetic, sevoflurane, is widely used in Japan. We first report a patient who developed liver dysfunction following sevoflurane anesthesia. He had a resection of the bilateral extra toes at the age of eleven months. Although no problems occurred during the operation, he had serious liver dysfunction. Fourteen days after operation, serum GOT was elevated to the maximum of 836U. The pathogenesis is considered to be related to sevoflurane anesthesia, because viral hepatitis was excluded, and sevoflurane is considerably positive in lymphocyte stimulation test in contrast with antibiotics.

Anesthesia, Inhalation↗
PubMed1991

[A study on crosstalk correction in dual energy acquisition of 123I-MIBG and 201TlCl in myocardial SPECT].

In the simultaneous dual energy acquisition, energy spectrums of two radionuclides crosstalk each other and this phenomenon is a cause of the poor quality of images. In order to obtain the image of high quality in dual energy acquisition of 123I-MIBG and 201TlCl, a crosstalk correction method was originated. The crosstalk from 201Tl to 123I window (R1) and the crosstalk from 123I to 201Tl window (R2) were determined by the cardiac phantom studies. R1 and R2 showed almost constant value throughout the myocardial wall. The crosstalk correction was performed using R1 and R2. After the crosstalk correction, the defect region placed in the cardiac phantom was detected more clearly both in visual interpretation and in quantitative analysis. The crosstalk correction method with R1 and R2 was applied to some clinical cases. By the crosstalk correction, the quality of image was improved and a false defect caused by crosstalk disappeared in a clinical case. The crosstalk correction was considered to be useful for improving the quality of image on dual energy acquisition.

3-Iodobenzylguanidine↗
PubMed1991

[Comparative study on vindesine plus cisplatin treatment of advanced non-small cell lung cancer--three divided doses (35 mg/m2, day 1, 8, 15) and single dose (80 mg/m2, day 1) of cisplatin. Chiba Lung Cancer Study Group].

Sixty-one patients with advanced non-small cell lung cancer were randomly allocated to receive vindesine (3 mg/m2, day 1, 8, 15) plus either three cisplatins (35 mg/m2, day 1, 8, 15) or one cisplatin (80 mg/m2, day 1). Among the 61 patients, the number of complete cases treated by the former administration schedule (group A) was 24 and by the latter schedule (group B) was 27. The response rate of group A was 25.0% and that of group B was 22.2%. There was no significant difference between survival curves of group A and B. The median survival times of group A and B were 8.5 months and 7.5, respectively. Regarding the incidence rate of various side effects, no difference was found between the two groups. However, according to the WHO grade of side effects, nausea/vomiting in group A was significantly milder than in group B. The grade of leukopenia in group A showed a tendency to be milder than in group B. In conclusion, in terms of tumor response, vindesine plus three doses of cisplatin was no better than conventional vindesine plus cisplatin chemotherapy, however side effects of the former were slightly less severe.

Antineoplastic Combined Chemotherapy Protocols↗
PubMed1991

Hepatotoxicity of eugenol and related compounds in mice depleted of glutathione: structural requirements for toxic potency.

Eugenol produces hepatic injury in mice depleted of glutathione (GSH) by pretreatment with buthionine sulfoximine (BSO). Several eugenol analogs were examined for their ability to cause hepatic injury after administration to mice in combination with BSO. Hepatotoxicity was assessed by measuring relative liver weight, liver blood volume, and serum GPT activity in mice. Comparison of the tested compounds showed that the structural requirements for toxic potency was a phenolic ring having an allyl substituent at the 4-position. These structural requirements can be explained by assuming that a vinylogous quinone methide formed by metabolic oxidation of eugenol plays a role in inducing hepatotoxicity in GSH-depleted mice.

Alanine Transaminase↗
PubMed1991

[Clinical evaluation of fleroxacin in gynecological infections].

Fleroxacin (FLRX), a new quinolone oral antibacterial agent, was studied in the field of obstetrics and gynecology, and the following results were obtained. 1. Clinical efficacy was evaluated in 105 patients (intrauterine infection 38, adnexitis 28, extragenital organ infection 29, others 10), with an exclusion of 9 patients out of a total of 114 patients. FLRX was orally administered at 200 mg or 300 mg once daily. 2. Clinical efficacy rates were 37/38 (97.4%) in intrauterine infection, 26/28 (92.9%) in adnexitis, 29/29 (100%) in extragenital organ infection and 10/10 (100%) in others. 3. Efficacy rates classified by isolated organisms were 23/23 (100%) in single infections by Gram-positive organisms, 11/13 (84.6%) in those by Gram-negative organisms, 8/9 (88.9%) in those by anaerobic organisms and 15/19 (78.9%) in mixed infections. 4. Side effects were observed in 4 cases (3.5%); gastrointestinal disorder with diarrhea and diarrhea in 1 patient each and insomnia in 2 patients. In laboratory examination, eosinophilia and elevation of GOT and GPT were noted in 1 patient each (1.9%). Based on the above results, we consider that FLRX is a useful drug for the obstetrical and gynecological infections.

Administration, Oral↗
PubMed1991

[A kinetic study on serum prolactin concentration in the thyrotropin-releasing hormone test].

In order to estimate the mechanism of prolactin secretion using the kinetic model, serum prolactin concentrations in normal young men were measured by an immunoradiometric assay before and after intravenous administration of 500 micrograms of thyrotropin-releasing hormone (TRH). The kinetic model was applied to evaluate the secretion rate both before and after the administration of TRH. A good correlation between the calculated values and measured values of serum concentration was observed (r = 0.995); and the adequacy of the model was confirmed. A few minutes (1.97 +/- 0.57 min) after the administration of TRH, the secretion of prolactin was stimulated, and serum prolactin concentration was maximum at 12.7 +/- 2.1 min. The total amounts of secreted prolactin was 75.4 +/- 18.4 ng/ml, which corresponded to the amount that was secreted in 4.3 hours at the normal rate. The half-life of prolactin was 40.8 +/- 13.8 min, which is in good agreement with the previously reported values. We have already reported on the kinetic study on the TSH secretion after TRH. Comparing the concentration change of prolactin and TSH, which were reported previously, it was found that the stimulated secretion started almost simultaneously, but lasted longer with respect to TSH.

Adult↗
PubMed1991

[Coronary artery bypass grafting using right gastro-epiploic artery and cholecystectomy].

A 59-year-old male with ischemic heart disease and cholecystolithiasis underwent coronary artery bypass grafting (CABG) using the right gastro-epiploic artery (GEA) and cholecystectomy simultaneously CABG was performed under standard extracorporeal circulation followed by cholecystectomy at the same incision. The opening in the dome of the diaphragm where the pedicle of GEA was brought up was closed with fibrin glue. Then, sternum was closed and cholecystectomy was performed with no elongation of the incision. The postoperative course was uneventful without mediastinitis or other infectious events. The postoperative angiography showed good patency of the GEA graft. Combined CABG using GEA and cholecystectomy is beneficial for the selected patients.

Arteries↗
PubMed1991

A topographical relationship between Helicobacter pylori and gastritis: quantitative assessment of Helicobacter pylori in the gastric mucosa.

A topographical relationship between the number of Helicobacter pylori in the gastric mucosa and the histological severity of gastritis was studied in 902 pairs of biopsy specimens taken from 314 patients. A pair of biopsies were taken from the antrum, the lesser curvature of the middle body, and the greater curvature of the upper body of the stomach. The quantitative assessment of H. pylori was made based on smear, culture, and tissue section. The histological severity of gastritis was assessed as to the degrees of mononuclear cell and polymorphonuclear leukocyte infiltration. A positive correlation was confirmed between the number of H. pylori and the severity of polymorphonuclear leukocyte infiltration. The degrees of inflammatory cells infiltration in the specimens with H. pylori colonization were significantly lower in the upper body than in the antrum.

Adolescent↗
PubMed1991

[The concentration of endothelin in maternal vein, umbilical vein and artery of normal pregnancy and pregnancy-induced hypertension].

The concentrations of endothelin (ET) in maternal vein (MV), umbilical vein (UV) and artery (UA) of normal pregnancy (N) and severe pregnancy-induced hypertension (sPIH) were measured to investigate the significance of ET in the maternal and feto-placental circulation of normal pregnancy and PIH. 1) The concentrations of ET (pg/ml blood: mean +/- S.E.M.) in MV of a normal non-pregnant group, 1st, 2nd and 3rd trimester of N were 1.00 +/- 0.19 (n = 2), 0.55 +/- 0.16 (n = 4), 0.45 +/- 0.14 (n = 4) and 0.89 +/- 0.09 (n = 10), respectively. The concentration of ET in MV of 3rd trimester of sPIH was 2.76 +/- 1.21 (n = 7), and significantly (p less than 0.05) higher than in MV of 3rd trimester of N. 2) The concentrations of ET in UV and UA of N and UV of sPIH were 1.53 +/- 0.05, 1.29 +/- 0.06, 2.12 +/- 0.46, respectively. The concentrations of ET in UV and UA of N were significantly (p less than 0.01) higher than in MV of N. 3) The concentrations of ET in MV of N and sPIH correlated significantly (p less than 0.05) with diastolic blood pressure of N (r = 0.53). It was concluded that the synthesis of ET during pregnancy was suppressed until the 2nd trimester, and that the increased ET in MV of sPIH might be one of the factors that caused the pathogenesis of PIH. And the high concentration of ET in UV and UA was supposed to operate play a role in feto-placental circulation.

Adult↗
PubMed1991

Hepatotoxicity of eugenol in mice depleted of glutathione by treatment with DL-buthionine sulfoximine.

Eugenol is widely used as a food flavoring agent and a dental analgesic. Mice treated with eugenol (400-600 mg/kg, po) in combination with an inhibitor of glutathione (GSH) synthesis, buthionine sulfoximine (BSO; 1 hr before eugenol, 4 mmol/kg, ip) developed hepatotoxicity characterized by increases in relative liver weight and serum GPT, hepatic congestion, and centrilobular necrosis of hepatocytes. Eugenol (up to 600 mg/kg) alone produced no hepatotoxicity. Drug metabolism inhibitors such as carbon disulfide, methoxsalen, and piperonyl butoxide prevented or significantly reduced the hepatotoxic effect of eugenol given in combination with BSO. On the other hand, pretreatment with phenobarbital (PB) increased the hepatotoxicity. These results suggest that eugenol is activated by a cytochrome-P-450-dependent metabolic reaction and that the liver injury is caused by inadequate rates of detoxification of the resulting metabolite in mice depleted of hepatic GSH by BSO treatment.

Alanine Transaminase↗
PubMed1991

[Evaluation of myocarditis using T1-201 myocardial scintigraphy with bull's eye functional map].

In order to evaluate myocardial damage in a patient with myocarditis, rest thallium-201 myocardial single photon emission computed tomography (SPECT) was performed in 15 patients with myocarditis. For qualitative and semiquantitative analysis, Bull's eye functional maps were made up with SPECT images. In the functional map, the abnormal area, where T1 uptake is less than mean-2SD of the T1 uptake of normal subjects, is generally distributed in the myocarditis group. But focal and sequential abnormal areas were recognized more often in the clinically severe cases. Abnormal area tended to be observed commonly at the antero-septal wall, but it was uncommon at the lateral wall. Extent score, i.e. degree of extension of abnormal area, and severity score, i.e. degree of abnormality, were in good negative correlation with left ventricular ejection fraction (r = 0.6, r = 0.7). Furthermore, existence of abnormal area was in good correlation with the left ventricular regional wall motion. Abnormal area existed 100% in the akinetic region, 71% in the region of severe hypokinesis, and 27% in the region of hypokinesis. Abnormal area occupied 30% of the normokinetic region in the myocarditis group, which was a higher rate than in the normal control group (p less than 0.05). It was suggested that latent myocardial damage existed in the normokinetic myocardium with myocarditis. Thus, rest T1-201 SPECT with Bull's eye map is useful for clinical diagnosis in patients with myocarditis.

Adolescent↗
PubMed1990

D1-D2 complex of the photosystem II reaction center from spinach. Isolation and partial characterization.

A pigment-protein complex consisting of D1 and D2 proteins, but depleted in the two lower molecular mass components of photosystem II, i.e. cytochrome b-559 and psbI gene product, has been isolated by octyl-beta-D-glucopyranoside treatment of the purified photosystem II reaction center complex from spinach [(1987) Proc. Natl. Acad. Sci. USA 84, 109-112], followed by separation by high performance liquid chromatography using a gel-permeation column (TSK G3000 SW). The isolated complex is photochemically active in the photoreduction of intrinsic pheophytin a under steady-state illumination, in the presence of dithionite and methyl viologen, and exhibits pigment stoichiometries similar to those in the untreated reaction center, indicating that the D1-D2 complex provides the site of primary photochemistry in photosystem II, as well as the principal binding sites of pigments in the reaction center.

Chromatography, Gel↗
PubMed1990

Effect of heat treatment on tumor cells and antitumor effector cells.

We examined the effects of heat treatment on tumor cells and antitumor effector cells in order to investigate the combined effects of hyperthermia and immunotherapy including adoptive immunotherapy. Plasmacytoma MOPC104E syngeneic to BALB/c mice was used as the tumor cell line, while fresh spleen cells immunized to MOPC104E (IM-FSC) and interleukin-2-cultured lymphocytes induced in vitro from IM-FSC (CL) were used as the effector cells. Tumor cells or effector cells were heat-treated in a water bath at 42 degrees C for 30 or 60 min. Tumor cells heat-treated at 42 degrees C for 30 min grew temporarily and then regressed in the tumor transfer test, whereas untreated tumor cells showed no regression under any conditions. Furthermore, fresh spleen cells of mice inoculated with heat-treated tumor cells from regressed tumors showed marked tumor-neutralizing activity. The antitumor effects of CL were markedly inhibited by heat treatment according to the results of the tumor-neutralizing test and the 51Cr release assay, whereas heat treatment had little influence on the antitumor activity of IM-FSC. However, the neutralizing activity of effectors and the killing activity of CL against heat-treated tumor cells were both markedly augmented, since the susceptibility of the tumor cells to the antitumor effector cells was augmented by heat treatment. These results suggest that heat treatment of tumor cells augments the antitumor effects of IM-FSC and CL, hence we speculate that hyperthermia augments the effects of immunotherapy including adoptive immunotherapy.

Animals↗
PubMed1990

Activation of rat glutathione transferases in class mu by active oxygen species.

The activities of rat glutathione transferases (GSTs) 3-3, 3-4, 4-4 in Class mu towards 1-chloro-2,4-dinitrobenzene (CDNB) but not 1,2-dichloro-4-nitrobenzene were increased up to 5-fold during preincubation with 0.4 mM xanthine and xanthine oxidase in 50 mM potassium phosphate, pH 7.8, containing 0.1 mM EDTA. The activated GST 3-4, purified by S-hexylglutathione affinity chromatography after the treatment, had a higher specific activity (130 units/mg) than that of the nontreated (35 units/mg), the Km and Vmax values for glutathione or CDNB also were increased. Other rat GSTs in Class alpha and pi were inactivated by the same treatment. In the presence of superoxide dismutase, the activation of GST 3-4 did not occur.

Animals↗
PubMed1990

Distribution of neurotensin-containing fibers in the frontal cortex of the macaque monkey.

The distribution of neurotensin-containing fibers was examined in the frontal cortex of the monkey Macaca fuscata using the immunoperoxidase histochemical technique. An extremely dense network of neurotensin-containing fibers was observed in the medial prefrontal regions. The majority of cortical neurotensin fibers was observed in the anterior cingulate cortex (Walker's area 24) and adjacent medial prefrontal regions (areas 6 and 32). In area 24, the fiber density was similar to that in the nucleus accumbens. Immunoreactive fibers were particularly dense in two pyramidal layers (III, V). The medial prefrontal regions, areas 6 and 32, contained a moderate density of immunoreactive fibers. This regional distribution of neurotensin-containing fibers was not observed in other cortical fiber systems that contained substance P, somatostatin, or tyrosine hydroxylase. No neurotensin-containing cell bodies were observed in the frontal cortex. The present study demonstrates that the laminar and regional distributions of neurotensin-containing fibers are unique when compared to those of substance P- or somatostatin-containing fibers, and also distinct from that of catecholaminergic fibers. The distribution of telencephalic neurotensin fibers points to a relationship with limbic structures.

Animals↗
PubMed1990

A new class of rat glutathione S-transferase Yrs-Yrs inactivating reactive sulfate esters as metabolites of carcinogenic arylmethanols.

A glutathione (GSH) S-transferase (GST), catalyzing the inactivation of reactive sulfate esters as metabolites of carcinogenic arylmethanols, was isolated from the male Sprague-Dawley rat liver cytosol and purified to homogeneity in 12% yield with a purification factor of 901-fold. The purified GST was a homo-dimeric enzyme protein with subunit Mr 26,000 and pI 7.9 and designated as Yrs-Yrs because of its enzyme activity toward "reactive sulfate esters." GST Yrs-Yrs could neither be retained on the S-hexylglutathione gel column nor showed any activity toward 1,2-dichloro-4-nitrobenzene, 4-nitrobenzyl chloride, and 1,2-epoxy-3-(4'-nitrophenoxy)propane. 1-Chloro-2,4-dinitro-benzene was a very poor substrate for this GST. 1-Menaphthyl sulfate was the best substrate for GST Yrs-Yrs among the examined mutagenic arylmethyl sulfates. The enzyme had higher activities toward ethacrynic acid and cumene hydroperoxide. N-terminal amino acid sequence of subunit Yrs, analyzed up to the 25th amino acid, had no homology with any of the known class alpha, mu, and pi enzymes of the Sprague-Dawley rat. Anti-Yrs-IgG raised against GST Yrs-Yrs showed no cross-reactivity with any of subunits Ya, Yc, Yb1, Yb2, and Yp. Anti-IgGs raised against Ya, Yc, Yb1, Yb2, and Yp also showed no cross-reactivity with GST Yrs-Yrs. The purified enzyme proved to differ evidently from the 12 known cytosolic GSTs in various tissues of the rat in all respects. Immunoblot analysis of various tissue cytosols of the male rat indicated that apparent concentrations of the GST Yrs-Yrs protein were in order of liver greater than testis greater than adrenal greater than kidney greater than lung greater than brain greater than skeletal muscle congruent to heart congruent to small intestine congruent to spleen congruent to skin congruent to 0.

Amino Acid Sequence↗