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Biomedical subjects

T Shibata

Publications and source records attributed to T Shibata.

At least 937 records · Page 52Linked to original sources
PubMed1986

[An autopsy case of epithelioid sarcoma--a review of the cases reported in Japan].

A 48-year-old Japanese woman died of a general metastasis of epithelioid sarcoma originating in the right palm, which had been irradiated for trichophytia therapy 30 years earlier and where a contraction of the fingers and recurrent ulceration for seven years despite several surgical treatments had occurred. Although the tumor cells in the biopsy materials consisted of both large ovoid and polygonal cells with deeply eosinophilic cytoplasm and spindle-shaped cells, no particular appearances for definite diagnosis were obtained. The epithelioid appearance of tumor cells was first recognized in the metastatic foci of the lungs and kidneys at autopsy. In addition, 20 cases of epithelioid sarcoma reported in Japan are reviewed.

Female↗
PubMed1986

[A subacute oral toxicity study of T-2588 in juvenile rats].

A subacute toxicity study on T-2588 was carried out in juvenile rats (6 days-old 48 males and 48 females) by oral administrations at dose levels of 250, 500 and 1,000 mg/kg/day for 1 month. The results obtained were summarized below. During the study, there were no clinical signs considered to be related to the treatment. There were no T-2588-related abnormalities in urinalysis, hematological examinations, biochemical examinations and ophthalmological examinations. Slight increases in relative liver and kidney weights were observed in the 1,000 mg/kg-treated group and slight increases in relative kidney weight were detected in the 500 mg/kg-treated female group. Histologically, however, T-2588-related abnormality was not observed. The maximum safety dose of T-2588 was estimated to be 250 mg/kg/day. In addition to the above examinations, male reproductive performance was examined in the group administered with a dose level of 1,000 mg/kg/day. No adverse effects were observed in male fertility and F1 generation.

Administration, Oral↗
PubMed1986

[A study on the disulfiram-like reaction of T-2588. Influence of the consecutive administration of T-2588 on hepatic alcohol dehydrogenase and aldehyde dehydrogenase activities and blood levels of ethanol and acetaldehyde].

A study on disulfiram-like reaction of T-2588 was carried out using Sprague-Dawley male rats. A 500 mg/kg/day dose of T-2588 was given orally to 14 male rats once daily for 7 days. Disulfiram (200 mg/kg/day X 3 days, p.o.), cephalexin (CEX) (500 mg/kg/day X 7 days, p.o.) and cefmetazole (CMZ) (500 mg/kg/day X 7 days, i.v.) were used as the positive control and 2 comparative controls, respectively. The results obtained were summarized below. Each parameter (aldehyde dehydrogenase activity and the blood aldehyde level) in the disulfiram-like reaction was not affected by the T-2588 administration. A marked inhibition of aldehyde dehydrogenase activity (low-Km ALDH, Enzyme I) and a significant increase of the blood aldehyde level were observed in the rats receiving disulfiram. No drug-related disulfiram-like reaction was induced in the male rats receiving CEX, while alterations similar to the disulfiram action were recognized in rats receiving CMZ.

Acetaldehyde↗
PubMed1986

[Effect of single or consecutive administration of T-2588 on hepatic-injured male rats].

The present study was carried out to examine the effect of single or consecutive administration of T-2588 on liver of male rat injured by the administration of D-galactosamine X HCl. The T-2588 was orally given to hepatic-injured rats at doses of 125 mg/kg and 1,000 mg/kg singly or for consecutive 5 days. A 10 ml/kg dose of the vehicle was orally given to control rats. The results obtained were summarized below. Single administration of T-2588. Twenty-four hours after a single administration of T-2588, the liver taken from control rats apparently indicated galactosamine-induced hepatitis. No drug-related alterations were observed in hepatic functional test, liver weight and histological examinations at either dose of T-2588. Galactosamine-induced hepatitis was not affected by a single administration of T-2588. Consecutive administration of T-2588. Twenty-four hours after a 5-consecutive-day administration of T-2588, galactosamine-induced hepatitis in control rats was restored to the normal state. The cure of galactosamine-induced hepatitis was not affected by a 5-consecutive-day administration of T-2588. The hepatic aldehyde dehydrogenase activity in hepatic-injured rats was not affected by a 5-consecutive-day administration of T-2588.

Administration, Oral↗
PubMed1986

[Ehlers-Danlos syndrome--clinico-pathology and orthopedic treatment].

Eight cases of Ehlers-Danlos syndrome (EDS) were surveyed for clinical manifestations and orthopaedic treatment. Cases of EDS were clinically subdivided into three groups. The first group was characterized by multiple congenital contractures in the extremities, so that it was very difficult to distinguish it from arthrogryposis multiplex congenita in early infancy. Since laxity of the soft tissue coexists with contracture in this group, over-correction of deformity caused much more disability than under-correction, especially in clubfoot. Care should therefore be taken to avoid this. The third group was characterized by marked laxity of the soft tissue from birth. Diagnosis in this group was easily made by the obvious triad of EDS. Lengthy immobilization in an appropriate position was necessary to maintain a corrected position for the treatment of any deformity in the hip, foot or hand. In the second group, deformity and disability were clinically so mild that no orthopaedic management was generally required.

Child, Preschool↗
PubMed1985

Monoclonal antibodies with specific effects on partial activities of recA protein of Escherichia coli.

recA protein of Escherichia coli promotes a wide variety of DNA reactions in vitro. Specific effectors of recA protein should be very useful in elucidating the mechanisms of these complex reactions. Six mouse hybridoma clones that secreted class G immunoglobulins specific to recA protein were obtained in three cell-fusion experiments. Five IgGs were purified by affinity chromatography. These monoclonal antibodies were characterized by examining their effects on the single-stranded DNA-dependent ATPase activity, negatively superhelical double-stranded DNA-dependent ATPase activity, and an activity in pairing negatively superhelical closed circular double-stranded DNA and homologous single-stranded DNA-fragments to form D-loops. These IgGs inhibited all, some, or one of these three activities, and from the spectra of their inhibitory effects they were classified into four groups. This classification suggests that each of the monoclonal antibodies binds to one of at least four antigenic determinants on recA protein and specifically inactivates one or more of the active centers on the protein. These monoclonal antibodies will be useful in analyzing the complex reactions promoted by recA protein.

Adenosine Triphosphatases↗
PubMed1985

Effect of hypoxic cell radiosensitizers on glutathione level and related enzyme activities in isolated rat hepatocytes.

A comparative study of the effect of misonidazole and novel radiosensitizers on glutathione (GSH) levels and related enzyme activities in isolated rat hepatocytes was performed. Incubation of hepatocytes with 5 mM radiosensitizers led to a decrease in the intracellular GSH level. The most pronounced decrease in cellular GSH was evoked by 2,4-dinitroimidazole-1-ethanol (DNIE); after incubation for only 15 min, GSH was hardly detected. DNIE-mediated GSH loss was dependent upon its concentration. DNIE reacted with GSH nonenzymatically as well as with diethylmaleate, while misonidazole and 1-methyl-2-methyl-sulfinyl-5-methoxycarbonylimidazole (KIH-3) did not. Addition of partially purified glutathione S-transferase (GST) did not enhance DNIE-mediated GSH loss in a cell-free system. DNIE inhibited glutathione peroxidase (GSH-Px), GST, and glutathione reductase (GSSG-R) activities in hepatocytes, while misonidazole and KIH-3 did not. GSH-Px activity assayed with H2O2 as substrate was the most inhibited. Inhibition of GSH-Px activity assayed with cumene hydroperoxide as substrate and GST was less than that of GSH-Px assayed with H2O2 as substrate. GSSG-R activity was decreased by DNIE, but not significantly. Incubation of purified GSH-Px with DNIE resulted in a little change in the activity when assayed with H2O2 as substrate.

Animals↗
PubMed1985

Acceleration of rat liver phospholipid metabolism after long-term cadmium administration.

Male Wistar rats, 6 weeks old, were allowed free access to water containing cadmium chloride at a concentration of 250 ppm as cadmium (Cd) for 6 and 12 months. The growth, as measured by body weight of Cd-treated rats, was significantly retarded. Electron microscopic studies revealed the appearance of small vacuoles in the cytoplasm, and involution of the rough endoplasmic reticulum (RER) in both the liver and whole kidney. When radioactive precursors of phospholipids, H3(32)PO4 and [1(3)-H]glycerol, were injected (ip) into cd-treated rats, the incorporation of 32P into phosphatidylcholine (PC) in the liver was increased 3.2- and 5.8-fold after 6- and 12-month Cd administration, respectively, and that of 3H into PC was also increased 2.3- and 2.2-fold after 6- and 12-month Cd administration, respectively. In the kidney, however, the incorporation rates of these radioactive precursors were little affected by long-term Cd administration. In the liver of rats treated with Cd for 6 and 12 months, the activity of CDP-choline:cholinephosphotransferase was increased by 20-30% over the control. It was shown that de novo synthesis of PC, which is a major constituent of biological membranes, was accelerated by long-term Cd administration in the liver but not in the kidney. These results suggest the possibility of regenerating the membranes in damaged hepatocytes after 6 and 12 months of Cd administration.

Animals↗
PubMed1985

Serum collagenase-like peptidase activity in rheumatoid arthritis and systemic lupus erythematosus.

Collagenase-like (CL) peptidase activity in serum, which was measured using a newly synthesized substrate, (succinyl-Gly-Pro-Leu-Gly-Pro)-4-methylcoumaryl-7-amide, was significantly lower in patients with advanced rheumatoid arthritis or with systemic lupus erythematosus than that in normal controls. Decrease of the serum enzyme activity was more pronounced in systemic lupus erythematosus. No significant change in serum CL-peptidase activity was found in other connective tissue diseases such as mixed connective tissue disease and Sjögren's syndrome.

Arthritis, Rheumatoid↗
PubMed1985

Kinetics of homologous pairing promoted by RecA protein: effects of ends and internal sites in DNA.

When recA protein was preincubated with single-stranded DNA in the presence of an ATP-regenerating system prior to the addition of homologous duplex DNA, a slow presynaptic step was eliminated, and the subsequent homologous pairing was revealed as a reaction whose rate exceeds by 1 or 2 orders of magnitude the calculated rate of spontaneous renaturation in 0.15 M NaCl at Tm -25 degrees C. The pairing reaction displayed saturation kinetics with respect to both single-stranded and double-stranded DNA, indicating the existence of a rate-limiting enzyme-substrate complex. The signal observed in the assay of the pairing reaction was due to pairing at free homologous ends of the duplex DNA, as well as pairing in the middle of the duplex molecule, away from a free end. The apparent rate of pairing of circular single strands with linear duplex DNA was equal to the sum of the rates of pairing at sites located at either end of the duplex DNA or at interior sites, but the apparent rates attributable to ends were greater, and nicks also stimulated the apparent rate.

Adenosine Diphosphate↗
PubMed1985

Late estimation of myocardial infarct size by total creatine kinase nomogram.

We studied the possibility of enzymatic estimation of myocardial infarct size in patients late (between days 2 and 6) after the onset of acute myocardial infarction (AMI), in whom estimation of infarct size was difficult by analysis of time-activity curves of serum creatine kinase (CK) because of the lack of the enzymatic information during the initial 48 hours. Serial determinations of serum enzymes were performed in 32 patients within 6 hours after the onset of AMI and significantly close correlations were observed between cumulative total CK release and the cardiac fraction of lactate dehydrogenase isoenzyme (LDH1) activities from day 2 to day 6 after the onset of AMI (r = 0.863 to 0.870; p less than 0.001). We developed a nomogram to estimate cumulative total CK release by serum LDH1 activities obtained between days 2 and 6 after AMI and evaluated the reliability of the nomogram. Cumulative total CK release obtained from serial serum CK activities correlated closely with total CK release obtained from the nomogram in the second group of patients with AMI (r = 0.923 to 0.946; n = 24; p less than 0.001). Our total CK nomogram requiring few blood samples was useful in late estimation of infarct size in patients who were admitted to the hospital between days 2 and 6 after the onset of AMI.

Aged↗