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Biomedical subjects

T Gotoh

Publications and source records attributed to T Gotoh.

At least 199 records · Page 11Linked to original sources
PubMed1990

[Myelodysplastic syndrome (RAEB-T) occurring after adjuvant chemotherapy for colon and rectum cancers].

A 67-year-old man was admitted to our hospital because of bleeding tendency and high fever. The patient had a past history of gastrectomy and transverse colectomy for cancer of transverse colon at age 57, and rectum resection for rectum cancer at age 59. After these operations, Tegafur 645 g, MMC 56 mg, and Ara-C 560 mg were administered for about 6 years. Hematological examinations revealed hemoglobin of 7.7 g/dl, white cell count of 9,500/microliters with 8% myeloblasts, and platelet count of 7,000/microliters. A diagnosis of myelodysplastic syndrome (RAEB-T) was made from the finding of bone marrow smear, which showed 28% myeloblasts, and neutrophils and megakaryocytes with morphologically abnormal nuclei and cytoplasms. Chromosomal banding study of the bone marrow cells revealed -5, -8, 7q- in all analyzed cells. These findings suggest that the preceding adjuvant chemotherapy is probably related to the occurrence of myelodysplastic syndrome.

Aged↗
PubMed1990

[Transient hypoglycemic hemiplegia due to insulin autoimmune syndrome--a case report].

Hypoglycemia causes a variety of neurologic symptoms, and yet it is rarely responsible for such a sudden, focal neurologic deficit as hemiplegia. Herein we described a rare case of what was believed to be transient hypoglycemic hemiplegia. An 80-year-old woman was admitted to the hospital on June 10, 1988, following frequent episodes of abnormal behavior and transient weakness of the right extremities. These symptoms, similar to those of cerebrovascular diseases, characteristically occurred early in the morning and disappeared after breakfast. On admission no definite abnormalities were disclosed on neurologic examination. Neuroradiological evaluations by CT, cerebral angiography and single photon emission CT failed to demonstrate abnormalities. The patient remained stable until the following morning, when she suddenly became restless and confused and developed total aphasia and the right hemiplegia. The blood sugar was estimated to be 34 mg/dl and electroencephalogram (EEG) showed continuous slow wave activities involving the bilateral fronto-parietal region. Intravenous injection of glucose solution instantaneously resulted in disappearance of both neurologic symptoms and EEG abnormality. Serum insulin level was found extremely increased ranging from 7000 to 8000 microU, eventually leading to a diagnosis of insulin autoimmune syndrome. Hemiplegia due to hypoglycemic attack was reviewed in the literature, and the pathogenesis and EEG findings were also discussed.

Aged↗
PubMed1990

[A case of herpes simplex encephalitis with cerebral white matter lesion after acyclovir administration].

Herpes simplex virus (HSV) is regarded as an agent that selectively affects temporal and frontal lobes with necrosis and hemorrhage, and no case of herpes simplex encephalitis (HSE) with white matter lesion in a diffuse fashion has previously been reported. A 2-year-old boy developed high fever, right hemi-convulsions and lethargy. Computed tomography (CT) showed wedge-shaped areas of high density in the left frontal region, whereas, cerebral angiography disclosed no vascular abnormality. T1-weighted magnetic resonance imaging (MRI) demonstrated cortical changes which were similar to those illustrated by CT. However, T2-weighted images depicted further spread high intensities of the lesion. The patient's symptoms spontaneously disappeared before an antiviral drug, acyclovir, was administered. After the significant increase of HSV antibody titers in serum and cerebro-spinal fluid (CSF) established a definite diagnosis, acyclovir was intravenously given at a daily dosage of 30 mg/kg for a period of 6 days in order to prevent the recurrence of HSE. Two months later, T2-weighted MRI visualized a diffuse lesion of increased signal intensities involving the white matter of both hemispheres, while both CSF protein and myelin basic protein were significantly elevated. Despite of these changes of the white matter, our patient developed a few symptoms such as mild speech disturbance, slight weakness of the right upper limb and sialorrhea. Although the mechanism of these changes in the white matter remains obscure, it is postulated that a direct invasion of HSV to the white matter, an immunological disorder following HSV infection and a side effect of acyclovir could have triggered a reversible process of demyelination of the cerebral white matter.

Acyclovir↗
PubMed1989

Detection of missing vesicoureteral reflux with bethanechol chloride-aided voiding cystourethrography.

Experience in the detection of absent vesicoureteral reflux with bethanechol-aided voiding cystourethrography is presented. The detection rate with conventional contrast-enhanced voiding cystourethrography among 9 study subjects, in whom vesicoureteral reflux otherwise was highly suspected from accompanying clinical, urographic and endoscopic features, and in whom it was absent contralaterally or bilaterally, was improved from 33 per cent (only 3 of 9 patients were positive for reflux) to 100 per cent (all 9 were proved to have vesicoureteral reflux) after bethanechol stimulation. Some representative cases are presented and the mechanisms of inducing vesicoureteral reflux with bethanechol are discussed as well as its clinical relevance. Bethanechol-aided voiding cystourethrography is suggested as a highly sensitive method to detect absent vesicoureteral reflux.

Adult↗
PubMed1989

Adrenal hemorrhage in the newborn with evidence of bleeding in utero.

A case is reported of adrenal hemorrhage in a newborn with evidence of bleeding while in utero. The patient had a large cystic mass on ultrasound at 36 weeks of gestation. Abdominal computerized tomography after birth also revealed the cystic mass above the left kidney, which became smaller with peripheral calcification when he was 5 months old. Thus, adrenal hemorrhage was presumed. The cystic mass had disappeared on followup ultrasound when the patient was 8 months old. This case suggests that adrenal hemorrhage can occur even before delivery.

Adrenal Gland Diseases↗
PubMed1989

Spectrophotometric, electron paramagnetic resonance and oxygen binding studies on the hemoglobin from the marine polychaete Perinereis aibuhitensis (Grübe): comparative physiology of hemoglobin.

The physicochemical properties of giant hemoglobin (Hb) of the marine polychaete Perinereis aibuhitensis were extensively studied and the following results were obtained. (1) Light absorption spectra of the oxy, deoxy, CO, met, and cyanomet derivatives were similar to those for human Hb, except for a somewhat peculiar shape and pH-dependence of the met derivative, and high absorbance values around 277 nm for all these derivatives of Perinereis Hb. Abnormal pH dependence for the met derivative was confirmed by powder electron parmagnetic resonance (EPR) spectroscopy, which revealed that a water molecule does not coordinate to the heme iron as a sixth ligand. The high absorption around 277 nm is indicative of the existence of some non-heme polypeptide chains and/or a high content of aromatic residues in the molecule. (2) UV difference and derivative spectra revealed oxygenation-induced conformational changes in the protein moiety that are related to the degree of cooperativity. (3) The EPR spectrum for the nitrosyl derivative showed well-resolved triplet-triplet splittings due to 14N, indicating that the proximal residue is probably a histidine. (4) The oxygen affinity and cooperativity of this Hb were pH-dependent. Mg2+ markedly increased the oxygen affinity, the Bohr effect, and the cooperativity, which was maximal at physiological pH. CO2 and anions such as 2,3-diphosphoglycerate and inositol hexaphosphate had no effect on the oxygenation properties. Thus, different from vertebrate Hb, the oxygen-binding properties of this Hb are regulated by divalent cations which bind preferentially to the oxy form. The low temperature-dependence of oxygen affinity observed for this Hb is a sign of adaptation to the environment by this poikilothermic organism. (5) By using a graphic method, the minimal functional unit that preserves the full cooperativity (allosteric unit) was inferred to be the one containing 6 heme groups and its significance is discussed in connection with the structural hierarchy of the molecule.

2,3-Diphosphoglycerate↗
PubMed1989

[The role of uninhibited bladder in antireflux surgery. Special reference to reflux recurrence and diverticulum formation].

A retrospective study on antireflux surgery for primary vesicoureteral reflux at Hokkaido University Hospital was performed. One hundred and seventy-nine patients (299 ureters) underwent antireflux surgery in these 17 years and 7 months. When the period was divided into 3, success rate was 96.5, 93.8 and 100 per cent, respectively. Overall success rate was 96.6 per cent. There was a combined failure or complication in 9 patients. The records of these 9 were reviewed in detail. Three were believed to be a technical error: 2 stricture and one persistent reflux. The remaining 6 were all children except one and had no clear reason for failure: 2 persistent reflux and 4 contralateral appearance of reflux ("missing VUR"). Four of these 6 patients were characterized by voiding dysfunction, namely uninhibited bladder. In 3 patients reflux disappeared spontaneously by administration of anticholinergic agent. In many of these, vesical diverticulum formation was also noted to precede or to coincide with recurrence or appearance of reflux. Thus other 3 patients with diverticulum formation after antireflux surgery were added and re-evaluated. All 3 children had voiding dysfunction with uninhibited bladder. Diverticulum formation was believed to be related to uninhibited bladder in at least one child. It seems that the child with uninhibited bladder and reflux is particularly at risk for failure or complication of antireflux surgery. Patients with symptoms of voiding dysfunction deserve a complete evaluation, including cystoscopy and urodynamics.

Child↗
PubMed1989

[Experience of the parenchyma saving procedure in the surgical management of renal cell carcinoma].

The result of renal conserving procedures for the surgical management of renal cell carcinoma experienced in 10 patients was reported. All except two were afflicted with tumor involvement in both kidneys (four cases) or in the solitary functioning kidney (four cases). The tumor stage was I in 8 and IV in 2 patients. One of the stage IV patients died of metastatic disease 8 months postoperatively. Of the 9 patients, 8 remained free of cancer in the follow-up period, while one who received an enucleative surgery and whose pseudocapsule of the tumor was missing had a local recurrence. Four of the 5 tumors having no pseudocapsule or having an invasion in the pseudocapsule were grade 2 or 3. The renal conserving surgery is believed to yield an excellent control in low grade and low stage tumors. Partial nephrectomy, rather than simple enucleation, remains to be a preferred surgical treatment in parenchyma-sparing operation, although the enucleative surgery may have a good indication for multiple and central encapsulated tumors.

Adult↗
PubMed1989

[A case of ischemic disturbance of inner ear].

We reported a 51-year-old male with ischemic disturbance of right inner ear resembling Meniere's disease. The patient had a sudden-onset episode of vertigo, right severe hearing disturbance, nausea, vomiting and gait disturbance. Two days after, he had hypersomnia, vertical gaze palsy, double vision, left Horner's sign, and sensory disturbance of pain and temperature of right half body involving face. Brain MRI disclosed high intensity area in T2-weighted image and proton density in bilateral paramedian thalamo-mesencephalic region and right cerebellum (area of the anterior inferior cerebellar artery). Cerebral angiography showed 90% or more stenosis of the right vertebral artery, 50% stenosis of the left vertebral artery before the posterior inferior cerebellar artery (PICA), and 60% stenosis of distal portion of the basilar artery. Furthermore, stem portion of the posterior cerebral artery, and the right anterior cerebellar artery and the left vertebral artery after the PICA were absent or occluded. Right deafness was evaluated to be Jerger type II, namely disturbance of inner ear. Caloric tests showed no response, and right auditory brainstem response showed no waves. Main cause of this vertigo and right deafness was considered to be disturbance of inner ear due to ischemia of right labyrinthine artery, though this patient was not a typical case of the anterior cerebellar artery syndrome. Ischemic disturbances of inner ear have been reported only in patients with the anterior cerebellar artery syndrome, therefore this patient who had only acute ischemic disturbance of inner ear and did not have disturbance of caudo-lateral portion of the pons was considered to be very rare.

Cerebral Angiography↗
PubMed1989

[Clinical evaluation of cefixime in the treatment of acute uncomplicated cystitis].

Cefixime (CFIX) was administered 200 mg (2 divided doses) per day to 154 female patients with acute uncomplicated cystitis. Ninety four of the 154 patients who satisfied the criteria proposed by the UTI Committee, Japan were examined for the efficacy of the treatment, but 151 of 154 patients were included in the study of the side effects of the drug. The overall clinical efficacy was excellent in 80.8% and moderate in 18.1% of the patients. Ninety five (97.9%) of 97 strains which were isolated from the patients were eradicated in the urinary specimens by the treatment. Subjective side effects were observed in only one (0.7%) of the 151 patients, who complained of a sensation of heaviness in the head. No drug-related aggravation in the laboratory test was observed except for three patients who showed mild elevation glutamic pyruvic transaminase, alkaline phosphatase and blood urea nitrogen. These results showed that the oral administration of CFIX was excellent and satisfactory in the treatment for acute uncomplicated cystitis.

Acute Disease↗
PubMed1988

Novel S-S loops in the giant hemoglobin of Tylorrhynchus heterochaetus.

The extracellular hemoglobin of the polychaete Tylorrhynchus heterochaetus is a "giant" multisubunit protein consisting of two types of subunits: a "monomeric" chain (chain I) and a disulfide bonded "trimer" of chains IIA, IIB, and IIC. We have reported the complete amino acid sequences of all four chains (Suzuki, T., and Gotoh, T. (1986) J. Biol. Chem. 261, 9257-9267). The sites of disulfide bonds in the trimer have now been determined. In the trimer, there are two interchain disulfide bonds between chains IIA and IIC, and IIB and IIC, respectively. In addition, each of the four chains, I, IIA, IIB, IIC, has an intrachain disulfide bond. Thus, according to our "192-chain" model (Suzuki, T., and Gotoh, T. (1986) J. Mol. Biol. 190, 119-123), there are 288 disulfide bonds in Tylorrhynchus hemoglobin. Digital image processing of scanning transmission electron micrographs of negatively stained Tylorrhynchus hemoglobin indicated dimensions of 28 x 18 nm.

Amino Acids↗
PubMed1988

Different roles of the diphosphate moieties of allylic and homoallylic diphosphates in prenyltransferase reaction.

In contrast to the reactivity of geranyl methylene-diphosphonate in the reaction catalyzed by farnesyl diphosphate synthase, that of isopentenyl methylenediphosphonate showed an optimum at a more acidic pH than that of isopentenyl diphosphate, and it was inhibited by magnesium ions under certain conditions. These facts suggest that isopentenyl diphosphate is engaged in the enzyme reaction in the form of metal-free substrate contrary to the allylic substrate, which reacts in the form of metal-complexed substrate. Thus the diphosphate moieties of allylic and homoallylic substrates have different roles in the prenyltransferase reaction.

Animals↗
PubMed1988

The calcium, copper and zinc content of some annelid extracellular haemoglobins.

The extracellular haemoglobins of Lumbricus and Tylorrhynchus contain 50 and 61 tightly bound calcium atoms per molecule, respectively. In addition, they contain one to four tightly bound copper and zinc atoms. Although the role of the latter is unknown, that of calcium is probably structural, assisting in the maintenance of the native hexagonal bilayer structure.

Animals↗
PubMed1988

Immunocytochemical presentation of alpha-fetoprotein-producing gastric cancer in ascitic fluid: a case study.

A case of primary gastric cancer without hepatic metastasis showing extremely high alpha-fetoprotein (AFP) levels is reported. This case illustrates the application of the immuno-peroxidase technique to ascitic fluid cytology. Papanicolaou-stained smears of the ascites permitted the diagnosis of a metastatic carcinoma. A positive reaction to AFP was demonstrated in the tumor cells in the ascitic fluid cellular samples as well as in the paraffin-embedded tissue section of the primary gastric carcinoma. Rising AFP levels were also detected in ascitic fluid. AFP fractionation using lectin-affinity-crossed-line immunoelectrophoresis showed the hepatic rather than yolk sac type. Reports of such occurrences are few; no study, to the best of our knowledge, has previously documented cytological and immunocytochemical diagnosis in ascitic fluid. AFP-producing gastric cancer should be considered in the differential diagnosis.

Adenocarcinoma↗
PubMed1988

An evolutionary tree for invertebrate globin sequences.

A phylogenetic tree was constructed from 245 globin amino acid sequences. Of the six plant globins, five represented the Leguminosae and one the Ulmaceae. Among the invertebrate sequences, 7 represented the phylum Annelida, 13 represented Insecta and Crustacea of the phylum Arthropoda, and 6 represented the phylum Mollusca. Of the vertebrate globins, 4 represented the Agnatha and 209 represented the Gnathostomata. A common alignment was achieved for the 245 sequences using the parsimony principle, and a matrix of minimum mutational distances was constructed. The most parsimonious phylogenetic tree, i.e., the one having the lowest number of nucleotide substitutions that cause amino acid replacements, was obtained employing clustering and branch-swapping algorithms. Based on the available fossil record, the earliest split in the ancestral metazoan lineage was placed at 680 million years before present (Myr BP), the origin of vertebrates was placed at 510 Myr BP, and the separation of the Chondrichthyes and the Osteichthyes was placed at 425 Myr BP. Local "molecular clock" calculations were used to date the branch points on the descending branches of the various lineages within the plant and invertebrate portions of the tree. The tree divided the 245 sequences into five distinct clades that corresponded exactly to the five groups plants, annelids, arthropods, molluscs, and vertebrates. Furthermore, the maximum parsimony tree, in contrast to the unweighted pair group and distance Wagner trees, was consistent with the available fossil record and supported the hypotheses that the primitive hemoglobin of metazoans was monomeric and that the multisubunit extracellular hemoglobins found among the Annelida and the Arthropoda represent independently derived states.

Amino Acid Sequence↗
PubMed1988

Postoperative reduction of serum beta-HCG in testicular seminoma.

Serum beta-HCG and urinary HCG were measured in 17 patients with histologically proved pure seminoma of the testis. The patients have been followed to date for 10 to 74 months after orchiectomy, and have no residual disease or recurrence of their disease. Preoperative urinary HCG levels were abnormal in 9 patients (53%). Serum beta-HCG levels were slightly elevated in 6 out of 12 patients evaluated, and were reduced after orchiectomy even in patients with preoperative normal beta-HCG levels (P less than 0.05). Preoperative levels of the tumour marker in seminoma were far lower than in patients with non-seminomatous germ cell tumours, but it would not be rare to see a small amount of HCG produced by the tumour cells in the seminoma.

Adult↗
PubMed1988

Immunological relatedness of annelid extracellular hemoglobins and chlorocruorins.

1. The immunological relatedness of several annelid extracellular hemoglobins and chlorocruorins was investigated using ELISAs and Western blotting to determine the binding of purine polyclonal and monoclonal antibodies to Lumbricus terrestris hemoglobin with the hemoglobins of Tubifex tubifex, Tylorrhynchus heterochaetus, Arenicola marina and Macrobdella decora and the chlorocruoins of Myxicola infundibulum and Eudistylia vancouverii. 2. Polyclonal antibodies to Lumbricus terrestris hemoglobin bound to all the other hemoglobins and chlorocruorins. However, the titers were in all cases one to several orders of magnitude smaller than with Lumbricus terrestris hemoglobin. 3. Polyclonal antibodies to Eudistylia vancouverii chlorocruorin bound to the hemoglobins of Lumbricus terrestris, Tubifex tubifex, Arenicola marina, Tylorrhynchus heterochaetus and Macrobdella decora. 4. Of the nine monoclonal antibodies to Lumbricus terrestris hemoglobin isolated, two (No. 24 and No. 26) bound to the other hemoglobins and to Myxicola chlorocruorin, but the binding was again weaker than with Lumbricus hemoglobin. Antibody No. 26 also bound to Eudistylia chlorocruorin. Although antibody No. 24 appears to recognize a conformation-dependent epitope, antibody No. 26 recognizes a common epitope in each of the four subunits M, D1, D2, and T of unreduced Lumbricus hemoglobin. 4. An additional two monoclonal antibodies to Lumbricus hemoglobin (No. 21 and No. 25) bound also only to Tubifex hemoglobin. Antibody No. 21 recognizes subunits D1 and M of Lumbricus hemoglobin and No. 25 appears to recognize a conformation-dependent epitope.

Animals↗