Biomedical subjects
S Oi
Publications and source records attributed to S Oi.
[The stress ulcer in the neurosurgical disease and the warning data (author's transl)].
Twelve cases of G.I. tract bleeding, treated in the Department of Neurosurgery, Kobe University School of Medicine, were analyzed with the special reference to clinical data before the episode of G.I. tract bleeding. These 12 cases consist of 10 cases of aneurysm, 1 of metastatic brain tumor, and 1 of chronic subdural hematoma. The anterior communicating artery has the majority in the case of aneurysm by 50 per cent. In each case, C.B.C., bleeding time, coagulation time, serum electrolytes, serum glucose, glucosuria, steroid administration, blood pressure, hyperthermia, and water balance were reviewed retrospectively. Only serum glucose showed the specific abnormality with the average of 135 mg/dl (Hoffman method) before the episode of G.I. tract bleeding among them. In 1931, Cushing reported the clinical case of G.I. tract bleeding with intracranial disease and also experimental G.I. tract bleeding, in which discussion he concluded only parasympathetic nerve system has the involvement in the mechanism. In 1952, French, however, certified also the involvement of sympathetic nerve system in G.I. tract bleeding with the experimental results. In addition to this report, many experimental works under the standpoint of hypothalamus involvement in stress ulcer were undertaken. On the other hand, hyperglycemia and glycosuria in the stress have been reported as the results of clinical and experimental works. In 1971, Frohman concluded that only ventromedial nuclei has relation to the control of glycogen metabolism in hypothalamus from his experimental results. We concluded that this hyperglycemia before the evidence of G.I. tract bleeding due to the involvements of hypothalamus or other parts of C.N.S. in the neurosurgical disease is one clinical sign of the stimualtion to sympathetic nerve system that also can be a cause of G.I. tract bleeding, and this hyperglycemia before the evidence of G.I. tract bleeding should be paid attention as a warning datum.
[Cerebral polyuric hyponatremia--discussion of a new syndrome with disturbance of electrolyte balance of central origin (author's transl)].
We have experienced with 50 cases of parasellar tumors, four cases of which had persistent thirst, polydipsia, polyuria, and reversible temporary hyponatremia secondary to hypernatriuresis. The mechanism of the syndrome in these four cases could not be explained by either that of the syndrome of hypernatremia or of the so-called SIADH. We tentatively named this syndrome as "CEREBRAL POLYURIC HYPONATREMIA" and the criteria of this syndrome as as follows: 1) persistent thirst, polydipsia polyuria, 2) reversible temporary hyponatremia secondary to hypernatriuresis, 3) exception of the following items--administration of uretic drugs, renal and adrenal dysfunction, hyperglycemia, hyperlipemia, overadministration of water, and poor administration of NaCl. The mechanism of this syndrome is presumed as follows: 1) compression by a tumor or surgical attack to the anterior hypothalamus, 2) disturbance of the mechanism of ADH secret-on, 3) extrasecretion of natriuretic factor possibly produced in the anterior hypthalamus, and 4) preservation of the thirst center.
The reaction of sulfhydryl reagents with bovine hepatic monoamine oxidase. Evidence for the presence of two cysteine residues essential for activity.
The bovine liver monoamine oxidase (EC 1.4.3.4) was found to be inactivated by various well-known sulfhydryl reagents like p-mercuribenzoate, methylmercuric iodide and 5,5'-dithiobis-(2-nitro benzoic acid). The present investigation shows that the inactivation of the enzyme results from reactions of these reagents with 2 out of 8 titratable sulfhydryl groups per 10(5) g of the enzyme. The substrate, benzylamine, and competitive inhibitors like benzaldehyde, p-nitrobenzaldehyde, benzyl alcohol protected the enzyme from inactivation by the mercurials or the Ellman reagent. The inactivation experiments with these sulfhydryl reagents, the protection experiments, and the kinetics as well as physicochemical observations suggest that there are only two cysteine residues that are required for activity of the enzyme. It is possible that these two residues may be active-center residues.
[Introduction of computerized axial tomography and its application to diagnosis of brain tumor].
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[Disturbance in fluid and electrolytes metabolism with central origin with special reference to sodium (author's transl)].
Clinical aspects with disturbances in fluid and electrolytes metabolism in brain diseases were discussed reviewing 41 cases experienced in our department. These 41 cases were found in 377 patients with diseases of the central nervous system in our hospital during recent 14 months. Hyponatremia was found in 19 cases and aneurysms of A-C, A1 and A2 had the majority of the cases. The cerebral angiography suggested an unstable blood supply to the anterior portion of the hypothalamus, for instance, showing remarkable shift, spasm or obstruction A-C, A1 or A2. The duration of hyponatremia was transient and mostly less than 2 weeks after the last attack of subarachnoid hemorrhage. On the contrary, hypernatremia was seen in 9 cases and 6 of them were found in cases of tumors in the pineal region and A-C, A1 and A2 were intact angiographically. The hypernatremia was continuous and did not response to V-P shunt or any kinds of infusion therapy. The hypernatremia due to cerebral disease is thought to be a result of destruction of the supraoptic and paraventricular nuclei or adjacent area in the anterior potion of the hypothalamus in most of presumed these cases. It might be that the decreased blood supply to the anterior position of the hypothalamus offers an information not of hypoosmolarity but of hypovolemic state, and this information increases the secretion of ADH. This mechanism of hyponatremia could play an important role in S.I.A.D.H.
Inhibition of rat liver rhodanese by di-, tricarboxylic, and alpha-keto acids.
Rat liver rhodanese [EC 2.8.1.1] purified by ammonium sulfate fractionation, CM-cellulose and Sephadex G-200 chromatography yielded two active fractions (I & II). Their molecular weights were estimated to be 1.75 X 10(4) (I) and 1.26 X 10(4) (II) by the gel filtration method. Kinetic studies revealed that Fraction I rat liver rhodanese catalyzes thiocyanate formation from thiosulfate and cyanide by a double displacement mechanism. Carboxylic acids such as DL-isocitric, citric malic, pyruvic, and oxaloacetic acid were competitive inhibitors with respect to thiosulfate, whereas fumaric, succinic, and alpha-ketoglutaric acids were noncompetitive inhibitors with respect ot thiosulfate. Incubation of mitochondria with sulfate and alpha-ketoglutaric acid caused a significant decrease in rhodanese activity.
[Clinical study on rebleeding of cerebral anuerysms--with special references to the warning signs of rebleeding and antifibrinolytic treatment during waiting time for surgery (author's transl)].
The warning signs of rebleeding in the ruptured cerebral aneurysms, and the effect of antifibrinolytic treatment on the prevention of rebleeding from the ruptured aneurysms were studied and evaluated satistically by analysing the 62 single ruptured aneurysms. The incidennce of rebleeding during waiting time for surgery was higher in the following factors, i.e., the older patients, the Grade 2, the higher blood pressure, the larger aneurysms, the anterior-communicating aneurysms, the vasospasm. The critical time for rerupture was within three days after admission and within seven days after last bleeding. The anti-edema treatment and the sedation treatment have no effect upon the rebleeding. There was no difference in incidence of rebleeding among the sex and the frequency of bleeding before admission. The operative mortality of the reruptured patients during waiting time for surgery was very high. The antifibrinolytic treatment definitely lessened the incidence of rebleeding of the ruptured aneurysms during waiting time for surgery, and there were no noticeable complications following this treatment. This treatment is of value in the prevention of rebleeding from ruptured cerebral aneurysms during waiting time for surgery.
Non-specific "pairing" of DNA molecules by recombination enzyme of Bacillus subtilis.
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Inhibition of bovine liver rhodanese by alpha-ketoglutarate.
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Mechanistic aspects of the oxidation of amines by monoamine oxidase.
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Mechanistic aspects of the bovine hepatic monoamine oxidase reaction.
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The effect of pH on the kinetic parameters and mechanism of beef liver monoamine oxidase.
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Mechanistic studies of beef plasma amine oxidase.
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Mechanistic studies of beef liver mitochondrial amine oxidase. 18. Amine oxidase.
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Biosynthesis of sclerin.
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Recent advances and racial differences in therapeutic strategy to the pineal region tumor.
The therapeutic modalities for pineal region tumors in Western countries differ from those in Japan, mainly because of the different patient populations. The majority of pineal region tumors in Japan are radio- and/or chemosensitive, and adjuvant therapy rather than extensive surgery plays the main part in the treatment of these tumors. The specific clinical features of and therapeutic modalities for pineal region tumors, together with racial differences, were analyzed at the joint symposium of the Japanese Society for Pediatric Neurosurgery and the Korean Society for Pediatric Neurosurgery. The results of a cooperative study, together with the collective experience in Korea, confirmed that this specific patient population is nearly identical to the Japanese one. The new therapeutic approaches to pineal region tumors recommended included neuroendoscopic or stereotactic biopsy as a "minimally invasive" initial procedure. The adjuvant therapeutic modalities were further analyzed and neoadjuvant chemotherapy, mainly with cisplatin or carboplatin with or without etoposide (VP-16), was recommended for the treatment of germinoma and nongerminomatous malignant germ cell tumors. "Target radiation therapy" with extensive chemotherapy is a hopeful regimen and a future subject of research.
Identical characteristics of the patient populations with pineal region tumors in Japan and in Korea and therapeutic modalities.
The therapeutic modalities used for tumors of the pineal region in Western countries differ from those in Japan, mainly because of the different patient populations. An extensive survey was conducted to delineate the racial differences in Japan and in Korea in the epidemiology and recent therapeutic modalities for this tumor group. Among the members of International Society for Pediatric Neurosurgery (ISPN), 15 from Japan and 5 from Korea reported their recent findings in 118 (1-25 years of age, mean 7.38-year period) and 125 (1-12 years of age, mean 6.69-year period) histologically verified cases, respectively. The patient populations in the two countries were found to be almost identical, with an extremely high incidence of germ cell tumors representing 71.2% (in Japan) and 80.0% (in Korea) of all pineal region tumors and neuroectodermal tumors representing only 15.2% and 16.8%, respectively. The most common type of pineal region tumor was germinoma (46.6% in Japan and 47.2% in Korea). The majority of tumors were radio- and/or chemosensitive, and adjuvant therapy rather than extensive surgery played the major role in the treatment in both countries. Radical resection of the tumor was recommended as the initial procedure by only 22.2% of neurosurgeons in Japan and 16.6% in Korea. Biopsy was recommended by 38.9% and 50.0%, and radiation therapy by 38.9% and 37.5%, respectively. A minimally invasive procedure, by either a neuroendoscopic (33.3% of biopsies in Japan) or a stereotactic approach (33.3% of biopsies in Korea), was considered to be appropriate as the initial procedure. The study disclosed the almost identical epidemiology of this brain tumor in Japan and in Korea and clarified the consequent therapeutic modalities. The authors emphasize that minimally invasive tissue diagnosis with or without tumor debulking should be considered as the initial step for the treatment planning of the pineal region tumor, followed by the most commonly indicated major procedures, including radiation therapy, chemotherapy and/or radical resection with various methodologies.