Biomedical subjects

H Fukatsu

Publications and source records attributed to H Fukatsu.

At least 55 records · Page 3Linked to original sources

PubMed1996

Renal oncocytoma treated by surgical enucleation: a case report.

We experienced a case of renal oncocytoma, in a 46-year-old woman. At a health examination, ultrasonography revealed a right renal tumor, and she was admitted to our hospital for evaluation. From the ultrasonogram, computerized tomography (CT) and angiography, we suspected a renal oncocytoma, but renal cell carcinoma was not completely ruled out. Since the location of the tumor seemed suitable for a local resection, we scheduled a surgical enucleation, but we intended to switch to a radical nephrectomy if examination of a frozen-section suggested renal cancer. Because the frozen findings were suggestive of an oncocytoma without malignancy, the surgical enucleation procedure was completed as scheduled. Pathological findings of the resected specimens were characterized by granular eosinophilic cytoplasm, and rounded nuclei without nuclear pleomorphism or mitotic figures. Electron microscopic studies revealed an increased number of mitochondria. The patient was accordingly diagnosed as having renal oncocytoma. We also reviewed the literature to elaborate procedures for a preoperative diagnosis and therapy for renal oncocytoma.

Adenoma, Oxyphilic↗

PubMed1995

OK-1035, a selective inhibitor of DNA-dependent protein kinase.

Screening for inhibitors of DNA-dependent protein kinase (DNA-PK) revealed 3-cyano-5-(4-pyridyl)-6-hydrazonomethyl-2-pyridone, designated OK-1035, to be a potent and selective inhibitor. When a synthetic peptide was used as a substrate, OK-1035 caused 50% inhibition of DNA-PK activity at 8 microM, a concentration more than 50 times lower than those required against seven other protein kinases tested. OK-1035 inhibited the phosphorylation by DNA-PK of consensus peptide as well as that of recombinant human wild type-p53. Kinetic studies indicated that OK-1035 inhibited DNA-PK activity in an ATP-competitive manner.

Amino Acid Sequence↗

PubMed1995

Fluorodeoxyglucose positron emission tomography in pancreatic cancer: an unsolved problem.

The aim of this study was to examine the significance and problems of 2-[fluorine-18]-2-deoxy-d-glucose (FDG) positron emission tomography (PET) in diagnosing pancreatic cancer and mass-forming pancreatitis (MFP). PET, X-ray computed tomography (CT) and magnetic resonance (MR) imaging were performed in 15 patients with pancreatic cancer and nine patients with MFP. The areas of the PET scan were determined according to the markers drawn on the patients at CT or MR imaging. Regions of interests (ROIs) were placed by reference to the CT or MR images corresponding to the PET images. Tissue metabolism was evaluated by the differential absorption ratio (DAR) at 50 min after intravenous injection of FDG [DAR = tissue tracer concentration/(injected dose/body weight). The DAR value differed significantly in pancreatic cancer (mean +/- SD, 4.64 +/- 1.94) and MFP (mean +/- SD, 2.84 +/- 2.22) (P < 0.05). In one false-negative case (mucinous adenocarcinoma), the tumour contained a small number of malignant cells. In one false-positive case, lymphocytes accumulated densely in the mass in the pancreatic head. Further studies are necessary to investigate the histopathological characteristics (especially the cellularity) and other factors affecting the FDG DAR on PET images.

Adenocarcinoma↗

PubMed1995

[Clinical study on stage PT1 and grade 3 transitional cell carcinoma of the urinary bladder].

Thirty-three patients who had transitional cell carcinoma of the bladder with stage PT1 and grade 3 components were treated between January 1980 and December 1992. Clinical study was done for these 33 patients on treatment modalities and it's problem, intravesical recurrence, disease progression and prognosis. Twenty-five of 33 patients underwent bladder-sparing surgeries and total cystectomy was performed for another 8 patients as initial treatment. Intravesical recurrence was observed in 18 (72%) of 25 patients who underwent initial bladder-sparing surgeries. Recurrence-free rate was 44% for 1 year and mean period to recurrence from initial therapy was 13.1 months. Although some adjuvant therapy after initial treatment was performed for 20 patients, it's efficacy in preventing intravesical recurrence could not be confirmed. Disease progression was recognized in 10 (40%) of 25 patients initially treated by bladder-sparing surgeries after median latent period of 33.7 months, whereas only one (12.5%) of another 8 patients who underwent total cystectomy showed progression, and 5-year progression-free rate after initial bladder-sparing surgeries was 55.6%. Three and five-year actural survival rate in all cases were 81.5% and 65.1%, respectively. According to initial treatment, 5-year survival rate was 62.2% for the patients treated by bladder-sparing surgeries, whereas it was 83.3% for the cases who underwent total cystectomy. However statistical significant difference was not recognized. In view of disease progression after initial bladder-sparing surgeries, patients with progression yealed a 45.7% 5-year survival rate compared to 81.5% for the patients without progression, and significant difference was demonstrated between them.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗

PubMed1995

Scintigraphic detection of xenografted renal tumor by anti-renal cancer monoclonal antibody radiolabeled with technetium-99m.

Accumulation in the tumor of the RCS-1 monoclonal antibody, which recognizes the cell surface antigen of renal cancer cells was examined. The antibody purified by affinity chromatography (protein-A column) and gel fractionation was labeled with technetium-99m (99mTc) by a direct method. High labeling efficiency (> 98%) could be routinely obtained. However, the 99mTc labeling of the antibody did not reduce the reactivity of the RCS-1 antibody. The labeled antibody was injected into nude mice transplanted with human renal and gastric tumors, and the accumulation of the antibody in each tumor and various tissues was compared at 48 hours after injection. The highest accumulation of radiolabeled RCS-1 antibody was observed in the AM-RC-3 renal tumors; at 8.0% of the injected dose per gram and a tumor-to-blood ratio of 1.05, respectively. However, the radiolabeled RCS-1, did not show specific accumulation in the gastric tumor nor in any tissues tested. The xenografted tumor, AM-RC-3 was successfully visualized with the radiolabeled RCS-1 antibody by scintigraphy.

Animals↗

PubMed1995

[Evaluation of sleep apnea syndrome (SAS) with low field MR fluoroscopy].

Eight cases of clinically diagnosed sleep apnea syndrome (SAS) and two normal volunteers were studied with low field MR fluoroscopy in order to monitor the waking and sleeping status of the upper airway. MR fluoroscopy revealed that only the sleeping patients showed occlusions of the upper airway. This technique provided us with useful information about the level, frequency and duration of occlusion in each case. Four of the eight patients demonstrated simple retropalatal occlusion, whereas the other four demonstrated mixed retropalatal and retropalato-retroglossal occlusion. Thus long-time monitoring, which is only possible with MR fluoroscopy, is needed to appreciate the complex nature of the disease. In addition, the comfortable surroundings and low noise level provided by the low field enabled physiological study to be performed without any tranquilizers in most of the patients, which is again only possible with MR fluoroscopy. MR fluoroscopy may become a tool of great clinical value, providing much important information for disease evaluation and treatment selection.

Adult↗

PubMed1995

[Two cases of priapism cured by transcatheter embolization of internal pudendal arteries].

We report here two cases of priapism. One of these cases was suspected to be drug induced and high and low flow mixed type. The patient had taken the drugs, alpha-blocker for hypertension and dysuria by BPH for a long time. He was treated by a caveno-glandular shunt. After surgery, detumescence was obtained for some time, but erection appeared again soon. Transcatheter embolization of the internal pudendal arteries was then performed, and detumescence became permanent. The other case was an idiopathic and high flow type. Detumescence was achieved soon by transcatheter embolization of the internal pudendal arteries only, then he experienced morning erection imperfectly on the 9th day after this treatment. The management of priapism as reported to date is also reviewed.

Aged↗

PubMed1995

[High resolution MR imaging of the inner ear apparatus using 3D-Fast spin echo sequence].

To evaluate the efficacy of high resolution MR imaging of the inner ear with 3D-Fast spin echo sequence, one volunteer and 12 patients were imaged with a 1.5 T MR scanner. High resolution T2-weighted images were obtained with a head coil in 13 minutes, and the voxel size was 0.39mm x 0.45mm x 1.2mm in most subjects. Original images and maximum intensity projection (MIP) images of the inner ear were evaluated. On original images, the endolymphatic duct was visualized in 72% of subjects, the cochlear aqueduct in 96%, three branches of the cranial nerves in the internal auditory canal in 100%, and flow void of the vessel in the cerebellopontine angle in 100%. On MIP images, more than two cochlear turns were visualized in 92% of subjects, three semicircular canals in 100%, and the anterior and posterior ampulla in 100%. MR imaging of the inner ear with 3D-Fast Spin Echo sequence provides a variety of useful information regarding the anatomy around the inner ear.

Ear, Inner↗

PubMed1994

[A study of prostatic tissue levels of cefodizime (CDZM)].

Twenty-four patients suffering from prostate hyperplasia were given venous injections of CDZM of either 1 or 2 g at specific intervals (30 min, 1, 2 and 4 hr) before surgery. Blood samples from the injected vein and tissue samples from the prostate were subsequently taken. In this study, the concentrations of CDZM in the prostate tissue (P) and in serum (S), as well as the ratio of the tissue to serum concentrations (P/S) were determined. In patients given 1 g injections, P ranged from 5.26-48.10 micrograms/g, while S ranged from 25.40-130.00 micrograms/ml and P/S ranged from 12.6-37.0%. In the patients given 2 g injections, P ranged from 9.40-49.20 micrograms/g, S ranged from 62.30-234.00 micrograms/ml and P/S ranged from 9.3-29.1%. CDZM exhibited excellent transmigration to the prostate tissue. Inflammatory bacteria present in prostatitis and urinary tract infections are generally those of E. coli, Proteus sp., but because the P range was much higher than the ratio of MIC, CDZM is expected to be useful against infections in the field of urology.

Aged↗

PubMed1994

MR imaging in patients with strabismus.

The patients with strabismus, including 8 with superior oblique paresis, 1 with inferior rectus paresis, and 1 with congenital constant exotropia, were examined with MR imaging at 1.5 tesla (T) or 0.5T with a surface coil. Abnormal findings of extraocular muscles were identified in 8 of the 10 patients and most of them were consistent with the clinical findings. Deviation of the optic nerves was noted in 5 patients. Coronal short repetition time (RT) and echo time (ET) images were used to measure the concerned extraocular muscles and the optic nerves. The differences in diameters between the concerned extraocular muscles of both the diseased and normal eyes were calculated. MR imaging is considered to be advantageous and can be favorably used to observe and measure the extraocular muscles and other intraorbital structures in patients with strabismus.

Adult↗

PubMed1993

Stimulatory effect of phospholipase A2 treatment on glucose utilization in human erythrocytes.

We examined whether modification of membrane phospholipids of human erythrocytes by hydrolysis with phospholipase A2 (PLA2 from bee venom) would affect glucose utilization, chosen as a typical model of intracellular metabolism, and, if so, intended to clarify the mechanism of the alteration of glycolysis. Treatment of erythrocytes with PLA2 induced a marked shape change (i.e., crenation) and significantly increased the rate of lactate production from glucose. Available evidence indicated that there is no relevance of this cell-shape change to the alteration of glycolysis. The lack of a detectable effect of papain treatment on glycolysis in PLA2-treated cells suggested that the increase in glycolysis by PLA2 treatment might not be caused by the conformational change of band-3 protein through modulation of membrane phospholipids. The result of the measurement of lactate production in the presence and absence of ouabain did not support the idea that hydrolysis of phospholipids by PLA2 treatment makes plasma membranes leaky to Na+ and consequently enhances glycolysis through activation of Na+/K(+)-ATPase. The action of PLA2 on glycolysis was abolished by extraction of free fatty acids in the cell membrane with bovine serum albumin. Loading erythrocytes with free fatty acid (oleic acid, linoleic acid, or arachidonic acid) caused a significant increase in glycolysis. Analysis of glycolytic intermediates suggested that the enhancement of glycolysis was induced by activation of 6-phosphofructokinase. The data, thus, indicate that treatment of human erythrocytes with PLA2 significantly accelerates glucose utilization and suggest that the stimulation of glycolysis is caused by activation of 6-phosphofructokinase through liberation of free fatty acids of membrane phospholipids by PLA2.

Adult↗

PubMed1993

Isolation and characterization of mouse CD7 cDNA.

The human CD7 antigen is a glycoprotein, M(r) 40,000, expressed on the surface of peripheral blood T-lymphocytes and thymocytes, and is the earliest surface antigen to appear on T-cell lineage cells. In this study, putative mouse CD7 cDNA was identified based on its similarities with human CD7. Five independent clones originating from the same mRNA species were isolated (designated as mCD7) by screening a mouse thymocyte cDNA library with human CD7 cDNA, J61, under moderate stringency. The longest insert of a 995 base pair had an open reading frame of 210 amino acids. Northern blot analysis using the mouse CD7 cDNA probe demonstrated a single 1.2 kilobase mRNA in the thymus, spleen, bone marrow, and small intestine. The protein deduced from mCD7 cDNA consisted of the leader, extracellular, transmembrane, and cytoplasmic domains of 24, 126, 21, and 39 amino acids, respectively, based on the hydrophobicity plot and the structure of human CD7. The extracellular domain contained three potential N-glycosilation sites, while the cytoplasmic domain contained one potential protein kinase C phosphorylation site. The amino acid sequence had 45.5% similarity with human CD7, while the similarities for the individual domains ranged from 49.2% to 63.2%. The six highly conserved regions, which may possibly be involved with still unknown CD7-mediated functions, were located in the extracellular and cytoplasmic domains.

Amino Acid Sequence↗

PubMed1993

In vitro activity of a new carbapenem antibiotic, BO-2727, with potent antipseudomonal activity.

BO-2727, a new 1-beta-methyl-carbapenem, was active at concentrations of 6.25 micrograms/ml or less against gram-positive and gram-negative bacteria, including some imipenem- and/or meropenem-resistant (MICs, > or = 12.5 micrograms/ml) Pseudomonas aeruginosa strains, against which it proved generally fourfold more active than imipenem and meropenem. BO-2727's antipseudomonal activity and its broad spectrum merit further investigation for clinical use by itself, since it was stable in the presence of renal dehydropeptidase I.

Anti-Bacterial Agents↗

PubMed1993

[Clinical study of renal cell carcinoma].

Previously, we reported the effects of human lymphoblastoid interferon (HLBI), using a transplantable human renal cell carcinoma strain (AM-RC-3) in nude mice established in our laboratory. An overall anticancer effect was found from its combination with UFT (Ft-207t uracil). In the present investigation, we examined the clinical effectiveness when HLBI was administered alone or in combination with UFT to the patients. Seventy-three patients who had undergone curative surgery were divided into 3 groups, according to the type of adjuvant therapy. The HLBI group consisted of 38 patients, including those administered the agent alone over 50 times for more than six months, and or those to whom it was given in combination with UFT. The second group of 23 patients had been treated with hormones, radiotherapy, or with an anticancer drug (Fluoride pyrimidine group), while the last group of 17 patients underwent no postoperative adjuvant therapy. The survival rate calculated by the Kaplan-Meier method revealed no significant effects of HLBI on the survival period, but a significant difference (p < 0.05) was found in the HLBI group compared to the other groups in terms of much higher non-recurrence rate. When HLBI was administered alone or in combination with UFT, a definite anticancer effect was seen in 6 (complete response 3, partial response 2, minor response (MR) 1, no change 5, progression of disease 14) of the 25 treated patients. Fourteen of the 25, treated patients had postoperative recurrence, and 11 patients had distant metastases, at the time of diagnosis which were considered to be progressive and measurable lesions. In 6 patients the response was better than MR, with the effective rate being 24%. Four of the 6 patients had received HLBI in combination with UFT, which suggests a clinical effect in this combination. However, the effectiveness was limited to the lung lesions, more effective treatment of the lesions in other sites is required.

Aged↗

PubMed1993

[Syringomyelic syndrome secondary to cervical canal stenosis and cervical spondylosis].

A 59-year-old man suffered from progressive muscular weakness and sensory loss of both upper limbs for seven years. Neurological examination revealed vest-form sensory loss of all modalities from the level of C3 to Th2 on both sides together with muscular weakness and atrophy of the upper limbs in predominantly proximal distribution. Deep tendon reflexes were generally hyperactive except for the left biceps brachii. Based on these neurological manifestations, a clinical diagnosis of syringomyelic syndrome was made. The plain X-ray showed anomalies of the craniovertebral junction; occipitalization of the atlas, separate odontoid and fusion of C2 and C3 vertebrae, as well as cervical canal stenosis with cervical spondylosis. On sagittal T2-weighted MRI, the spinal cord was compressed at multiple levels from C3/4 to C6/7, and an intramedullary high signal intensity area was demonstrated from the level of C1 to C3/4. T1-weighted axial image showed a cavity formation at the center of the cord from the level of C1 to C2. No chiari malformation was found. Normal pulsatile CSF movement was diminished below the level of compression on cine MRI. On delayed CT examination 6 hr after myelography, the contrast medium was collected inside the spinal cord and showed "snake-eyes" appearance at and near the level of spondylosis. Above this level extending to C1, there was a longitudinally oriented "pencil-shape" zone of intramedullary contrast collection. These neuroimaging findings well corresponded with the patient's neurological signs and symptoms. The muscular weakness of both upper limbs improved after conservative therapy including immobilization of the neck position.(ABSTRACT TRUNCATED AT 250 WORDS)

Cervical Vertebrae↗

PubMed1993

[Spindle cell carcinoma of the urinary bladder: a case report].

A 74-year-old man with spindle cell carcinoma of the urinary bladder is reported. He presented to our clinic with gross hematuria resulting in bladder tamponade. Transurethral resection (TUR) was performed in order to control severe hematuria intractable with conservative therapy. Histologically the tumor invaded the muscle layer and was composed of two components, small foci of transitional cell carcinoma and numerous spindle cells with severe atypia and then the transition was recognized between them. Immunohistochemically transitional cell carcinoma was intensely positive for cytokeratin (CK) and epithelial membrane antigen (EMA), but negative for vimentin (VIM). Moreover some parts of spindle cells were weakly stained for CK and EMA. Three months after TUR, multiple pulmonary metastases and moderate right hydronephrosis occurred and he died of respiratory insufficiency one month later.

Aged↗

PubMed1993

[A case of flexion myelopathy presenting with reversible muscular weakness and atrophy of the unilateral proximal upper limb].

A 16-year-old man visited our clinic because of right-sided weakness of shoulder abduction and elbow flexion. He was well until about three weeks previously. Neurological examination revealed only that he had severe weakness together with mild atrophy of the muscles innervated by the C5 and C6 segments (the deltoid, biceps brachii, brachioradialis), slight hypesthesia on the thumb, and loss of deep reflexes of the biceps brachii on the right. No pyramidal signs were found in the lower extremities. EMG showed neurogenic changes of the atrophied muscles. Neuroradiological studies revealed right-sided atrophy of the spinal cord at C4-5 disk level, anterior shift of the posterior cervical dura mater and congestion of the internal vertebral venous plexus mainly at C4 and C5 vertebral level with his neck flexed. Conservative physiotherapy provided a good recovery within a few months. The clinical and neuroradiological findings of this case resemble those of juvenile type of distal and segmental muscular atrophy of upper extremities excluding distribution of involved muscles because of the different level of the spinal cord lesion. Pathomechanism of this case is considered to be the same as that of juvenile type of distal and segmental muscular atrophy of upper extremities.

Adolescent↗

PubMed1993

[Clinical experience with extracorporeal shock wave lithotripsy using Dornier MFL 5000-(U) for urinary stone].

Our hospital recently installed one of the newest types of extracorporeal shock wave lithotripters, a Dornier MFL 5000-(U). We conducted preliminary clinical trials with the apparatus from April to June 1991. In this report we discuss our experience with the first 40 patients (52 stones) treated in a total of 52 extracorporeal shock wave lithotripsy (ESWL) sessions. Follow up observation was conducted for three months. Except in one case, invasive anesthesia was not used. A double J-catheter was inserted in 13 cases, a ureteral catheter in 7 cases, and percutaneous nephrolithotripsy (PNL) was used after ESWL in one case. After one month of follow-up, 27 patients (67.5%) were completely free from stone fragments, while at 3 months after treatment, 34 patients (85.0%) were free from stone fragments. No serious complications were observed after ESWL. We concluded that the Dornier MFL-5000-(U) apparatus is effective for renal and ureteral stones and generates no serious complications.

Adult↗