Search PubMed⌕ Search

Biomedical subjects

M Otsuka

Publications and source records attributed to M Otsuka.

At least 559 records · Page 31Linked to original sources
PubMedDate not supplied

Different patterns of [18F]dopa uptake in siblings with hereditary dentato-rubro-pallido-luysian atrophy.

Striatal glucose metabolism and [18F]dopa uptake were studied by positron emission tomography (PET) in two siblings with hereditary dentato-rubro-pallido-luysian atrophy (HDRPLA). The regional cerebral metabolic rate of glucose showed marked decreases in the cerebellum and brainstem in both cases. The elder brother, who had trunk titubation and intention tremor of extremities, showed decreased [18F]dopa uptake in the striatum. On the other hand, the younger brother, who had spontaneous myoclonus of the right shoulder and flank, showed increased [18F]dopa uptake in the striatum. These findings suggested that the wide variety of clinical symptoms of HDRPLA observed within a single family is closely related to the various neuronal dysfunctions at the neurotransmitter level.

Adolescent↗
PubMedDate not supplied

High [18F]FDG uptake in primary cerebral lymphoma: a PET study.

Two cases of primary intracranial malignant lymphoma with high uptake of [18F]fluorodeoxyglucose [( 18F]FDG) are reported. Malignant lymphomas should be considered in the differential diagnosis of brain tumors with high [18F]FDG uptake in positron emission tomography studies.

Aged↗
PubMedDate not supplied

High [18F]-fluorodeoxyglucose uptake in abdominal abscesses: a PET study.

We report two cases of abdominal abscess displaying high uptake of [18F]fluorodeoxyglycose (FDG) by positron emission tomography (PET). Abdominal abscesses should be considered in the differential diagnosis of abdominal masses showing high FDG uptake in PET studies.

Abdominal Neoplasms↗
PubMedDate not supplied

Activation of intracellular neutrophil elastase in the transplantation of ischemic liver.

Ischemia-reperfusion injury is an important cause of primary nonfunction of transplanted organs, and neutrophil elastase has been implicated in the pathophysiology of ischemia-reperfusion injury. We assessed the kinetics of intracellular neutrophil elastase (INE) activity in canine liver transplantation. Mongrel dogs underwent orthotopic whole-liver transplantation. The animals in group I (n = 6) received fresh liver grafts, and all of the dogs survived longer than 24 h. The animals in group II (n = 5) received liver grafts injured by 30 min of warm ischemia. Only 1 animal survived longer than 24 h after reperfusion. A significant increase in the serum ALT and LDH levels was observed in group II after reperfusion of the graft. Isolated peripheral neutrophils were homogenized, and the neutrophil elastase activity in the supernatant was determined by using a spectrophotometric assay. The INE activity was expressed as the neutrophil elastase value per 1 x 10(10) peripheral neutrophils. In group I, the INE activity 10 min and 2 h after reperfusion was 7.6 +/- 2.6 and 6.1 +/- 2.4 U, respectively. In group II, this activity was 25.9 +/- 7.4 and 44.3 +/- 23.7 U, respectively. There was a significant correlation between serum LDH levels and INE activity 10 min after reperfusion (gamma = 0.70, p < 0.02). In conclusion, the INE activity increased more sharply after the reperfusion of ischemically injured liver grafts. The INE activity correlates with serum LDH levels immediately after reperfusion, suggesting that the increase in the INE activity depends on the severity of ischemic damage.

Alanine Transaminase↗
PubMedDate not supplied

Clonogenic colony-forming ability of flow cytometrically isolated hepatic progenitor cells in the murine fetal liver.

Stem cells are defined as cells having multilineage differentiation potential and self-renewal capability. Hepatic stem cells have aroused considerable interest not only because of their developmental importance but also for their therapeutic potential. However, their presence in the liver has not yet been demonstrated. With the use of a fluorescence-activated cell sorter (FACS) and monoclonal antibodies, we attempted to ascertain whether hepatic stem cells are present in the murine fetal liver. For this purpose, we optimized a cell isolation technique for FACS sorting of fetal liver cells. When isolated CD45 TER119 cells (the non-blood cell fraction in the fetal liver) were tested for their clonogenic colony-forming ability, mechanical dissociation (pipetting) was the most suitable cell isolation technique for FACS sorting. We confirmed that these colonies contained not only cells expressing hepatocyte markers but also cells expressing cholangiocyte markers. To identify hepatic stem cells, studies must focus on CD45TER119- cells in the murine fetal liver.

Animals↗
PubMedDate not supplied

Lactic acidosis with hypoglycemia and hyperammonemia observed in two uremic patients during calcium hopantenate treatment.

Calcium hopantenate (HOPA), a drug for treating symptoms of cerebrovascular disease, is a derivative of gamma-amino butyric acid and is also an analog of pantothenic acid. It is speculated that calcium hopantenate may affect lactate generation, glucose metabolism, and ammonia disposal through the inhibition of pantothenic acid metabolism. We report two uremic patients with complaints of consciousness disturbance with lactic acidosis, hypoglycemia and hyperammonemia. HOPA is mainly excreted with urine. Severe accumulation of HOPA, documented at the onset of unconsciousness in our uremic cases, might be responsible for marked inhibition of pantothenic acid metabolism.

Acidosis, Lactic↗
PubMedDate not supplied

Benefits of combining radiotherapy with aggressive resection for stage IV gallbladder cancer.

BACKGROUND/AIMS: The efficacy of combining resection and radiation in the management of advanced gallbladder cancer has not yet been defined. In this study, effects of combining radiation therapy on survival, local control and the pattern of recurrences were analyzed as a retrospective review. METHODOLOGY: From October 1976 to May 1996, 85 patients with stage IV (pTNM) gallbladder cancer underwent various aggressive resection modalities in our institute, including 34 liver resections, 30 hepatopancreaticoduodenectomies. Intra-operative, external or intracavitary radiation therapy was supplemented to resection in 47 patients. RESULTS: The 30-day operative mortality rate was 5.9% and the overall 5-year survival rate of stage IV disease patients was 6.3%; 3 patients are living well more than 6 years after surgery. Adjuvant radiotherapy yielded a significantly (p=0.0023) higher 5-year survival rate (8.9%) than resection alone (2.9%). The local control rate was significantly (p=0.0467) higher in the adjuvant radiation group than in the resection alone group (59.1% vs. 36.1%). However, there was no statistical difference in the frequency of distant metastasis between the two groups. Significant improvement (p=0.0028) of long-term survival was exhibited when radiation was used appropriately on patients with microscopic residues only. Those with macroscopic or without microscopic residues failed to improve. The 5-year survival rate and median survival time of patients receiving adjuvant radiation therapy for microscopic residues were 17.2% and 463 days, respectively. CONCLUSIONS: Adjuvant radiation therapy following aggressive resection, in certain circumstances, improves prognosis with acceptable operative mortality for stage IV gallbladder cancer.

Adenocarcinoma↗
PubMedDate not supplied

Outcomes of aggressive treatment of stage IV gallbladder cancer and predictors of survival.

BACKGROUND/AIMS: Stage IV gallbladder carcinoma patients are rarely considered treatable by resection. They resign themselves to palliation because there is no long-term survival data available on the risks of morbidity and mortality following aggressive treatment. The aim of this study was to evaluate predictors of survival following aggressive resection surgery for stage IV gallbladder carcinoma. METHODOLOGY: In this retrospective study, we examined 93 patients with stage IV gallbladder carcinoma who had undergone resections. Of the 93 patients, 69 had undergone liver resection to various extents together with hepaticocholedochus resection (HCR); 2 had undergone pancreaticoduodenectomy (PD) both with and without HCR; 31 had undergone hepatopancreaticoduodenectomy (HPD); 7 had undergone cholecystectomy together with HCR; 12 had undergone cholecystectomy; and 3 had undergone extended cholecystectomy. Fifty of the 93 patients had also undergone adjuvant radiotherapy. Using univariate and multivariate analyses, 13 clinicopathologic risk factors were analyzed to predict survival. RESULTS: Operative morbidity and mortality rates were 17.2% and 5.4%, respectively. Overall, the 5-year survival rate and median survival time were 9.8% and 243 days, respectively. The 5-year survival rate was significantly higher in stage IVA (n = 17) than in stage IVB (n = 76), at 42.8% and 4.9%, respectively. Multivariate analysis revealed that sex, histopathologic type, lymph node involvement (N), subgroup of stage IV, post-resection residual tumors, and adjuvant radiotherapy were significant predictors of survival. CONCLUSIONS: Long-term survival, with acceptable mortality and morbidity, can be expected in female patients who have stage IVA gallbladder cancer consisting of well-differentiated adenocarcinoma and who undergo either complete microscopic resection or grossly complete resection followed by adjuvant radiotherapy.

Adenocarcinoma↗
PubMedDate not supplied

Hepatic functional reserve in patients with biliary malignancies: an assessment by technetium 99m galactosyl human serum albumin hepatic scintigraphy.

PROBLEM: Technetium 99m galactosyl human serum albumin (99mTc-GSA) is a hepatic scintigraphy agent that binds to the asialoglycoprotein receptors. We evaluated the clinical use of the scintigraphy for the pre-operative assessment of biliary malignancies. PATIENTS AND METHODS: Scintigraphy was performed before operation in 56 patients with biliary malignancies. A hepatic uptake ratio of 99mTc-GSA (LHL15; the count ratio of the liver to the sum of the heart and liver 15 min after injection of 99mTc-GSA) was calculated. RESULTS: LHL15 was significantly associated with bilirubin half-life in patients treated before operation with percutaneous transhepatic biliary drainage (P = 0.007). After operation, 4 of 18 patients with LHL15 < 0.925 died within 30 days. The postoperative mortality was significantly greater in patients with LHL15 < 0.925 than in patients with LHL15 > or = 0.925 (P = 0.033). CONCLUSION: 99mTc-GSA scintigraphy is useful in evaluating the hepatic functional reserve in patients with biliary malignancies.

Adult↗
PubMedDate not supplied

Hepatic resection for metastatic tumors from noncolorectal carcinoma.

BACKGROUND/AIMS: The role of liver resection for hepatic metastases from noncolorectal carcinomas has yet to be clarified. The present study examines a single institutional experience of hepatic resection for noncolorectal metastases. METHODOLOGY: From January 1987 to March 1999, 14 patients underwent curative resection for liver metastases from noncolorectal carcinomas. Records of these patients were reviewed. RESULTS: Resections were performed for liver metastases from gastric cancers (n = 8), pancreatic cancers (n = 2), and cancers of bile duct, the papilla of Vater, kidney, and breast (n = 1, each). Six patients (5 with gastric cancers and 1 with pancreas cancer) presented with synchronous disease and 8 with metachronous disease. In the gastric cancer patients, there are 2 disease-free survivors (26 and 53 months) in the metachronous group, though all of the 5 patients with synchronous disease died within 29 months. All of the 4 patients with pancreatobiliary carcinomas died within 2 years. One case of breast cancer and another of renal cell cancer are alive without disease at 49 and 9 months, respectively. CONCLUSIONS: For metastases from gastric cancers, better survival after hepatic resection is expected in metachronous cases than in synchronous cases. Hepatic resection may afford little benefit for patients with liver metastases from pancretobiliary cancers.

Aged↗
PubMedDate not supplied

Retroperitoneal multiple lymphangioma with differential cyst contents causing hydronephrosis and biliary dilatation.

We report a 40-year-old woman with retroperitoneal multiple cystic lymphangioma. Multiple cystic lesions were found on both sides of the aorta in the retroperitoneal and right pelvic spaces. These thin-walled cysts gradually increased in size leading to left hydronephrosis and dilatation of the common bile duct with cholecystitis, requiring resection. Analysis of cystic contents revealed differences between the cysts. The right cyst contained high concentrations of amylase, 3429 U/L, while the left cyst contained high concentrations of triglyceride, 470 mg/dL. No reports of patients with idiopathic retroperitoneal cystic lymphangioma have described differences in cystic contents. Differences in cystic contents according to tumor location strongly suggest that the cause of retroperitoneal lymphangioma is a developmental malformation in which lymphangiectasia follows the failure of developing lymphatic tissue to establish normal communication with the remainder of the lymphatic system.

Adult↗