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Biomedical subjects

M Ohira

Publications and source records attributed to M Ohira.

At least 127 records · Page 7Linked to original sources
PubMed1989

Intraocular penetration of CT-112, an aldose reductase inhibitor, following topical instillation.

Intraocular penetration of 5-(3-ethoxy-4-pentyloxyphenyl)thiazolidine-2,4-dione (CT-112), an aldose reductase inhibitor, was investigated in rabbits following topical instillation. The concentration of CT-112 in corneal epithelium, stroma, endothelium, lens, and aqueous humor, was sequentially determined by high-performance liquid chromatography. CT-112 peaked in the corneal epithelium, stroma, endothelium and aqueous humor in 30 minutes following instillation, then gradually diminished time-dependently over a period of 24 hours. CT-112 remained detectable in the lens up to 24 hours, with a peak concentration at 2 hours after instillation.

Administration, Topical↗
PubMed1989

Lymphocytes after autologous and allogenic bone marrow transplantation.

Lymphocyte reconstitution after bone marrow transplantation (BMT) was analyzed using two-color flow-cytometry in 18 patients and the differences between allogenic and autologous BMT were studied. The CD8 (+) CD11b (+) and CD8 (+) Leu7 (+) suppressor subsets were increased while the CD4 (+) 2H4 (+) suppressor inducer subset was decreased in both groups after BMT. These variations of suppressor associated subsets persisted for more than 100 days and were considered to be related to immunologic abnormalities in post-BMT patients. In addition, Ia (+) T cells were increased in both autologous and allogenic BMT patients. This increase appears not to be caused by reaction to allo-antigens, but rather reflects the reconstitution of the lymphocyte system after BMT. In contrast, the CD16 (+) NK cell subset was increased specifically in allogenic BMT patients and only for a short time following transplantation.

Adolescent↗
PubMed1989

Organ culture of frog muscle: maintenance of mass, enzyme levels, and contractile force.

This paper describes an organ culture system that maintains frog sartorius muscles in good condition for 5 days. In the absence of serum and insulin, muscles maintained at approximately 93% of resting length atrophied with significant decreases in dry weight, protein content, and contractile force, and in the levels of activity of citrate synthase, lactate dehydrogenase, and creatine kinase. Inclusion of 1.0 mU/ml of insulin in the culture medium prevented the decreases in muscle mass, twitch tension, and citrate synthase activity and minimized the decreases in lactate dehydrogenase, creatine kinase, and tetanic tension. Inclusion of 10% serum, in addition to 1 mU/ml insulin, in the medium did not have clear cut additional benefits. Stretching muscles to 110% of resting length (L0) resulted in marked deterioration with decreases in total protein, enzyme levels, and contractile force. Keeping muscles at approximately 93% L0 was as effective as maintenance at L0 in preventing atrophy and loss of contractile force and enzyme activities. This organ culture procedure, which maintains frog sartorius muscle in good condition without serum for at least 5 days, may provide a useful model for studying the regulatory mechanisms responsible for a variety of adaptations in muscle.

Animals↗
PubMed1989

[The measurement of hepatic circulation before and after orthotopic liver transplantation in dog--by using transit-time blood flow meter and H2 clearance method].

Orthotopic liver transplantation was successfully carried out in 40 mongrel dogs, in which hepatic circulation was investigated before and after grafting. Blood flows in hepatic artery, portal vein and intrahepatic inferior vena cava were measured by using transit-time ultrasonic blood flow meter and regional tissue blood flow was determined by hydrogen gas clearance method. Before transplantation the mean blood flows were 234 +/- 95mg/min in portal vein, 118 +/- 76ml/min in hepatic artery and 291 +/- 103ml/min in inferior vena cava in 40 recipients. The blood flow ratio of portal vein and hepatic artery was 2.9 +/- 2.2. The mean regional blood flow of the liver was 63 +/- 24ml/min/100g. After transplantation, the mean blood flows decreased to 189 +/- 86ml/min in portal vein, 77 +/- 51ml/min in hepatic artery and 179 +/- 111ml/min in inferior vena cava and the regional tissue blood flow was 57 +/- 25ml/min/100g. Hepatic arterial flow decreased by 37 percent after transplantation, however, portal venous flow decreased by 24 percent and the regional blood flow decreased by 9 percent after transplantation of the liver. These data suggested that the microcirculation of the liver was slightly disturbed after liver transplantation in dog, which was in part due to the decreased blood flows of the hepatic artery and portal vein.

Animals↗
PubMed1989

[Hodgkin's disease under twenty years of age--clinicopathological study].

Twenty two cases with Hodgkin's disease under 20 years of age who were diagnosed and treated in National Cancer Center during 1962-1986 were studied retrospectively. The most common initial symptom was swelling of lymph nodes (86%) and only 5 cases (23%) showed "B" symptoms. Laboratory findings showed that there were some cases with increased WBC counts but only 2 cases with an elevated LDH value. In 2 out of 4 cases serum copper value correlated well with their clinical state. Histologically lymphocyte predominance type, mixed cellularity type and nodular sclerosis type almost equally occurred in children younger than age 15 years. On the other hand nodular sclerosis type with mediastinal mass was predominantly encountered in older patients (especially female). The ten years' survival rate in stage I and II patients was 59% compared with 21% in stage III and IV patients. As for the results of initial treatment, complete remission and 10 years' survival rate were 91% and 87% in recent 12 years (1975-1986) compared with 55% and 36% in the preceding 13 years (1962-1974) respectively. Autopsy findings revealed rare involvements of the central nervous system and kidneys. Various late effects which may be caused by escalating doses of radiotherapy occurred in 6 out of 9 cases under the age of 15 years who survived. On the basis of these results lower-doses of radiotherapy combined with systemic chemotherapy appeared to be advisable for the treatment of childhood Hodgkin's disease.

Adolescent↗
PubMed1989

[The results of surgical treatment of post-infarction left ventricular aneurysms].

The surgical results of post-infarction left ventricular aneurysmectomy have been evaluated in 24 patients approximately 1 year after operation. In 20 patients coronary artery bypass grafting (CABG) was also carried out. In 8 patients mechanical circulatory assist such as intra-aortic balloon pump (IABP) or left ventricular assist device (LVAD) was undertaken for the purpose of weaning from cardiopulmonary bypass. Postoperative left ventricular function, such as ejection fraction and cardiac index, and classification of the New York Heart Association were improved significantly after aneurysmectomy. However, postoperative improvement of these parameters was not remarkable in cases of poor preoperative left ventricular function. Preoperative left ventricular function revealed to be poor in multiple vessel disease, and concomitant coronary artery bypass grafting with aneurysmectomy can be performed with good long-term results and significant improvements of postoperative cardiac function. In patients that had showed the end-diastolic perimeter more than 40% and the shortening rate of transverse axis at the left ventricular base less than 20%, postoperative improvement of cardiac function revealed unsatisfactory. Mechanical circulatory assist showed lifesaving effect, but in cases that required IABP or LVAD postoperative cardiac function has not improved significantly.

Adult↗
PubMed1989

[Multiple organ failure following open heart surgery in adults].

The cases multiple organ failure (MOF) which occurred post-operatively following open heart surgery in adults were studied on a pre and post-operative hemodynamics. Post-operative low cardiac output syndrome (LOS) was thought to result in decreased renal and hepatic perfusion with subsequent ischemic damage to these organs. Therefore, to management MOF, we have to prevent post-operative LOS, for example, administration of cathecholamine and vasodilator, and early clinical application of IABP and ventricular assist device (VAD). In a post-operative hemodynamics, the cases of severe right ventricular failure tend to have more protracted MOF. It was though that MOF could be minimized with shortened cardiopulmonary bypass duration, and early application of assisted circulation.

Adult↗
PubMed1988

Effects of exposure to cold on metabolic characteristics in gastrocnemius muscle of frog (Rana pipiens).

1. Responses of enzymic characteristics of gastrocnemius muscle were studied when frogs (Rana pipiens) were exposed to cold environment (4 degrees C). 2. The content of adenosine triphosphate (ATP) decreased significantly after cold exposure. This decrease was greater in starved than in fed frogs. 3. Although the glycogen content did not change, lactate levels were lower in cold-exposed than room-temperature (control) frogs. No change was observed in glycogen and lactate between fed and unfed frogs kept at 4 degrees C for 2 months. Lactate dehydrogenase activity tended to increase during chronic cold exposure, but not significantly. 4. The activities of citrate synthase, cytochrome oxidase, and beta-hydroxyacyl CoA dehydrogenase were higher in gastrocnemius of chronically cold-exposed frogs than in room-temperature controls. This increase was statistically significant only in the muscles of starved frogs; these muscles had the greatest decrease in ATP. 5. It was suggested that chronic cold exposure decreases skeletal muscle ATP content but may not affect glycolysis. The data also suggested that the decrease in ATP content stimulates mitochondrial biogenesis which increases enzyme activities.

Adenosine Triphosphate↗
PubMed1988

Administration of human urinary colony stimulating factor after bone marrow transplantation.

A phase II study of the use of colony stimulating factor derived from human urine (CSF-HU) was performed after bone marrow transplantation (BMT). Steady and rapid recovery of leukocyte and granulocyte numbers was observed. In most patients who received CSF-HU from day 1, leukocyte numbers started to increase on day 6 and monocytes and granulocytes on day 11. Significant differences in the days to recovery of leukocytes over 1 x 10(9)/l and of granulocytes over 0.5 x 10(9)/l were observed in comparison with non-randomized control patients. In some patients in whom recovery of leukocytes was delayed, CSF also seemed to be effective in increasing leukocyte numbers from 8 days after the start of administration. There was no significant difference in the rate of relapse of leukemia between the two groups. CSF-HU seems very promising as a treatment of patients after BMT by shortening the period of leukopenia or granulocytopenia.

Adolescent↗
PubMed1988

[A case of subacute thyroiditis associated with acute hepatitis].

We report one case of subacute thyroiditis associated with acute hepatitis, which is histopathologically diagnosed. A 43-year-old woman visited our hospital with chief complaints of fever, sore throat and anterior neck pain. Thyroid gland was found to be swollen and tender. Laboratory findings gave high ESR and positive test for CRP. High values of T3, T4 and RT3U indicated that the patient had hyperthyroidism. However no autoantibodies against thyroglobulin and microsome were found. High activities of serum AIP, LAP and gamma-GTP were observed. Serum GOT and GPT activities increased moderately. AIP type 2 was dominant in zymograms. Histopathological findings of liver specimen obtained by needle biopsy showed ballooning degeneration of hepatocytes with a slight focal necrosis and hyaline bodies. In addition bile plugs were observed in some biliary tubules. These findings were consistent with those of acute hepatitis. After three months all laboratory data were found to be within normal ranges and no recurrence has been observed. Subacute hepatitis associated with liver dysfunction is considered to be relatively frequent. However very few reports have been published on the case in which histopathological evidence for acute hepatitis was presented.

Acute Disease↗
PubMed1988

Retrospective study on amplification of N-myc and c-myc genes in pediatric solid tumors and its association with prognosis and tumor differentiation.

DNA was extracted from formalin-fixed and paraffin-embedded tissues of 85 patients with pediatric malignant solid tumors which had been resected at surgery or obtained at autopsy during a 24-year period. The tumors examined included 25 rhabdomyosarcomas, 12 Wilms' tumors, 10 hepatoblastomas and 37 neuroblastoma group tumors. Neuroblastoma group tumors were subclassified into 25 neuroblastomas and 12 ganglioneuroblastomas among which 6 composite ganglioneuroblastomas were included. Sample blocks were selected from both tumors and normal tissues in the majority of cases. We were able to reliably detect N- and c-myc gene amplification in tumor DNA by dot blot-hybridization. The N-myc gene showed approximately from 3- to 500-fold amplification in 19 of 33 cases of stage IV neuroblastoma group tumor. All of these 33 patients had been intensively treated with chemotherapy and/or radiotherapy. The c-myc was amplified 8-fold in 1 case of rhabdomyosarcoma, but neither N-myc nor c-myc was amplified in any cases of Wilms' tumor or hepatoblastoma. We retrospectively examined the association among N-myc gene amplification, prognosis, and histologic subtype in 33 patients with stage IV neuroblastoma group tumors. The survival of the patients with N-myc gene amplification was shorter than that of the patients without amplification of N-myc (p less than 0.05). There was no significant difference in prognosis between the 2 histologic subtypes; neuroblastoma and ganglioneuroblastoma, and the cases of tumors with amplified N-myc showed shorter survivals for each subtype (p less than 0.05). In every case of neuroblastoma group tumor, the copy number of the N-myc gene was the same among primary site and multiple metastatic tumors, even when the lesions showed differences in histologic subtype like neuroblastoma and ganglioneuroblastoma.

Child↗
PubMed1987

[Autologous bone marrow transplantation in osteosarcoma].

Four patients with osteosarcoma were treated with intensive chemotherapy and autologous bone marrow transplantation (ABMT). The patients received high-dose methotrexate (9-12 mg/m2) with citrovorum factor rescue, high-dose melphalan (60 mg/m2 X 3), actinomycin D (0.5 mg/m2 X 3), adriamycin (30 mg/m2 X 2) and high-dose cyclophosphamide (60 mg/kg X 2) during 4 weeks. Bone marrow was aspirated and cryopreserved before treatment and reinfused 48 hours after the completion of chemotherapy. Two of four patients had advanced osteosarcoma with multiple pulmonary metastasis, one of whom had responded well and achieved partial response while the other had shown no response, and both patients died of disease progression 4 and 11 months after ABMT, respectively. The other two patients who received this regimen at an earlier disease stage for prevention of pulmonary metastasis, are alive and well without any evidence of metastasis 31 and 18 months after ABMT, respectively. This regimen was tolerated well in all patients except for mild nausea and vomiting. No infectious episodes were observed during the period of aplasia which continued for 19 to 38 days after marrow infusion. These results suggest that this supralethal combination chemotherapy is safe and tolerable when used with ABMT and effective for patients with osteosarcoma, especially when applied in the non-metastatic phase.

Antineoplastic Combined Chemotherapy Protocols↗
PubMed1987

An experimental study of a splenic inhibitory factor influencing hepatic regeneration.

The effect of splenectomy on hepatic regeneration after 70 per cent partial hepatectomy was studied in rats. Compared with nonsplenectomized rats, preliminarily splenectomized rats showed significantly increased weights of the liver in the early stage (up to four days) after hepatectomy and significantly promoted deoxyribonucleic acid synthesis in the regenerating liver in terms of high levels of 3H-thymidine uptake, thymidine kinase activity and mitotic index in the residual liver 24 hours after hepatectomy. The splenic factor inhibiting hepatic regeneration, as previously suggested, was investigated by using primary cultures of rat hepatocytes. At 48 hours when the 3H-thymidine uptake by cultured hepatocytes reached maximum, the group containing a splenic extract showed significantly lower levels (p less than 0.005) of uptake than did the group without the extract and the group containing splenic venous serum also showed lower levels. This splenic factor was labile against heat and lost activity by trypsinization. Furthermore, gel filtration by the use of Sephadex G-75 column suggested the factor to be a protein-like substance with a molecular weight of 50,000 to 60,000. It is likely that a protein-like substance inhibiting hepatic regeneration after hepatectomy is present in the spleen.

Animals↗
PubMed1987

[Treatment of rhabdomyosarcoma at the National Cancer Center Hospital].

Seventy-nine patients with rhabdomyosarcoma (RMS) received treatment at the National Cancer Center Hospital between 1962 and 1985. The patients ranged in age from 4 months to 74 years with a median age of 6 years. Forty-six patients were male and 33 were female. The primary tumor site of RMS was the same as in the previous report. The head and neck region was the most frequent site (40.5%), followed by the extremities (34.1%), genitourinary region (15.2%), trunk (5.1%) and retroperitoneum (5.1%). Histologic types were embryonal RMS in 45 patients, alveolar RMS in 23 patients, pleomorphic RMS in 8 patients and unclassified RMS in 3 patients. As of October 1985, 14 of the 79 patients were still alive. Between 1962 and 1971, 38 patients were not treated by any protocol. After 1972, 41 patients received treatment using a 3 stage-related, multiple-modality program. In the first protocol, chemotherapy consisted of Vincristine, Cyclophosphamide, and Actinomycin-D, and 1 of 18 patients have survived more than 5 years. The cumulative 5-year survival rate of the first protocol was 11.1%. In the second treatment program, which involved Adriamycin in addition to the 3 drugs cited above, 4 of 23 patients have survived more than 5 years. The cumulative 5-year survival rate, 33.2%, was very improved.

Adolescent↗