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Biomedical subjects

H Osawa

Publications and source records attributed to H Osawa.

At least 55 records · Page 3Linked to original sources

[Long-term survival of a patient with postoperative liver metastasis of stage IVa gallbladder cancer responding to hepatic arterial infusion chemotherapy].

A 58-year-old man was diagnosed as having advanced gallbladder cancer (T4, P0, H0, N0, stage IVa) with direct invasion to the liver, transverse colon and duodenum. Therefore, extended cholecystectomy and bile duct resection with a partial resection of the transverse colon and the duodenum were performed in March 1992. Histopathological examination revealed moderately differentiated tubular adenocarcinoma of si, ly1, v1, hinf3, binf3, n0. Three years and eight months after the operation, multiple liver metastases were diagnosed by abdominal CT. Repeated hepatic arterial infusion chemotherapy with 5-FU 500 mg/body/w, MMC 4 mg/body/2w and EPI 40 mg/body/4w was performed starting in January 1996. Four months later, the lesions in the liver were reduced in size, and abdominal CT 10 months after the chemotherapy showed a partial response. However, the liver metastasis of the right lobe was enlarged on an abdominal CT in August 1997. Repeated hepatic arterial infusion chemotherapy with the same regimen was performed again starting in March 1998. Ten months later, the liver metastasis was slightly enlarged, but the greater part of the metastasis showed necrosis on an abdominal CT in January 1999. However, peritonitis carcinomatosa was observed later and the patient died 8 years after the operation.

Adenocarcinoma↗

Native valve salvage for post-traumatic tricuspid regurgitation.

We describe two cases of successful management by native valve salvage of an uncommon tricuspid valve regurgitation following blunt chest trauma. The two patients were diagnosed 13 years and six years, respectively, after the trauma. In both cases, tricuspid valvular insufficiency was caused by anterior leaflet prolapse due to chordal and papillary muscle rupture associated with annular dilatation. Operative repair with implantation of artificial chordae, papillary muscle reinsertion and ring annuloplasty resulted in complete recovery. The need for increased awareness of this lesion in patients suffering blunt chest trauma is emphasized, and the relevant literature reviewed.

Adult↗

Immediate and long-term results of coronary artery bypass operation in hemodialysis patients.

This study evaluated the early and late results of coronary artery bypass grafting (CABG) in patients on long-term maintenance hemodialysis (chronic HD) at Teikyo University Ichihara Hospital between January 1996 and June 2000. Thirty-six patients on chronic HD underwent CABG. There were 26 males (72%) and 10 females (28%) ranging from 41 to 81 years (mean +/- SD, 61.8 +/- 9.2 years) of age. Twenty-one patients (58%) had unstable angina, 14 (39%) stable angina, and 1 acute myocardial infarction. Eleven patients (31%) had urgent or emergency CABG. The average graft number was 2.5 +/- 0.8 (arterial graft 1.3 +/- 0.7/patient). Six patients had concomitant cardiac operations. Three patients underwent re- or a second re-CABG. Five patients underwent off-pump CABG. Principally, HD was performed during cardiopulmonary bypass and was followed by continuous hemodiafiltration in the early postoperative period. The early mortality was 11%; 25% in emergency and urgent CABG and 4% in elective CABG. In the follow-up period between 1 and 53 months (mean +/- SD 21.9 +/- 15.1 months), 4 patients died, and 9 patients developed recurrence of angina pectoris (6, occlusion of saphenous vein graft and 3, native coronary progression). Six patients had coronary intervention. The postoperative angiogram showed that all arterial grafts were patent, but the patency of the vein grafts was only 61.5%. The early results of CABG in patients on chronic HD was satisfactory. The late recurrence of angina pectoris mostly was caused by occlusion of the saphenous vein graft. In conclusion, the aggressive use of arterial grafts is crucial in CABG for patients on chronic HD.

Adult↗

[A case of lung cancer in which FDG-PET was useful for preoperative diagnosis].

The patient was 48-year-old woman. The patient was referred to our hospital due to detection of an abnormal shadow on a chest X-ray image during a health checkup. The results of a CT scan morphologically suggested a benign tumor, but a diagnosis could not be made even after bronchoscopic cytology. FDG-PET revealed accumulation at the tumor site suggestive of malignancy, and an operation was performed. Prompt pathological examination showed that the tumor was adenocarcinoma, and right lower lobectomy and lymphnode dissection were performed. FDG-PET is thought to be useful for diagnosis in cases of lung tumor in which a preoperative diagnosis can not be established.

Adenocarcinoma↗

Hemorrhagic shock due to intrathoracic rupture of an osteosarcoma of the rib.

A 13-year-old girl presented with dyspnea and chest pain. Chest radiography showed a massive left pleural effusion. Computed tomography revealed a tumor of the fourth rib. A large bloody effusion was drained. Her anemia worsened (hemoglobin: 4.8 g/dl), and hemorrhagic shock ensued. An emergency thoracotomy was performed. Bleeding from the ruptured tumor was identified. The fourth rib, the tumor, and the adjacent tissues were resected. Histopathologic examination revealed a ruptured primary osteosarcoma of the rib with pleural dissemination.

Adolescent↗

[Surgical treatment of chronic pulmonary thromboembolism caused by a cavernous hemangioma at the lower limb].

A 48-years old man complained of dyspnea and was admitted to the hospital. Chest enhanced CT confirmed the presence of the thrombus in the pulmonary artery. Cardiac catheterization showed severe pulmonary hypertension (mean PAP 75 mmHg). ATIII level, protein C and S antigen were within normal range. Anticardiolipin antibody and lupus anti-coagulant determination were negative. He was diagnosed as chronic pulmonary thromboembolism, and underwent pulmonary thromboendarterectomy via median sternotomy under deep hypothermic intermittent circulatory arrest. At the same time IVC filter was inserted. The origin of the thrombus was not detected before operation, but after surgery, MR angiography of total body showed a cavernous hemangioma at left lower limb. We speculated this lesion was the origin of pulmonary embolism.

Chronic Disease↗

Transducin-like enhancer of split proteins, the human homologs of Drosophila groucho, interact with hepatic nuclear factor 3beta.

Members of the hepatic nuclear factor 3 (HNF3) family, including HNF3alpha, HNF3beta, and HNF3gamma, play important roles in embryonic development, the establishment of tissue-specific gene expression, and the regulation of gene expression in differentiated tissues. We found, using the glutathione S-transferase pull-down method, that the transducin-like Enhancer of split (TLE) proteins, which are the human homologs of Drosophila Groucho, directly associate with HNF3beta. Conserved region II of HNF3beta (amino acids 361-388) is responsible for the interaction with TLE1. A mammalian two-hybrid assay was used to confirm that this interaction occurs in vivo. Overexpression of TLE1 in HepG2 and HeLa cells decreases transactivation mediated through the C-terminal domain of HNF3beta, and Grg5, a naturally occurring dominant negative form of Groucho/TLE, also increases the transcriptional activity of this region of HNF3. These results lead us to suggest that TLE proteins could influence the expression of mammalian genes regulated by HNF3.

Amino Acid Sequence↗

Aneurysms in the ascending aorta adherent to the sternum after cardiac surgery.

Sternotomy in a patient with an aneurysm in the ascending aorta adherent to the sternum after cardiac surgery can result in fatal hemorrhage or brain damage unless the distal ascending aorta can be identified and secured immediately. A left anterolateral thoracotomy was used in three patients with adherent aneurysms. The distal ascending aorta was isolated, and dissection was performed between the aneurysm and the sternum. There was no complication. This method was safe, and blood loss was minimized.

Adult↗

Partial left ventriculectomy in a 3-year-old boy with dilated cardiomyopathy.

A 3-year-old boy suffered severe heart failure 2 months after ventricular septal defect repair. The cardiothoracic ratio was 67% and the ejection fraction 13%. Echocardiography showed a dilated left ventricle and thin myocardium. After thorough study, we made a diagnosis of dilated cardiomyopathy. Because conventional therapy was unsuccessful, we conducted partial left ventriculectomy with Alfieri repair of the mitral valve. The postoperative cardiothoracic ratio was 57% at 1 year of follow-up and the ejection fraction 40%. The New York Heart Association functional class improved from IV to I. In conclusion, the role of partial left ventriculectomy is both as a bridge to transplantation and as a definitive repair in dilated cardiomyopathy during childhood.

Cardiomyopathy, Dilated↗

Identification of Gaucher cells in the chorionic villi associated with recurrent hydrops fetalis.

Recurrent non-immune hydrops fetalis has rarely been reported. In order to detect the risk of recurrence in a subsequent pregnancy, one should carefully consider the possibility of an inborn error of metabolism. In such cases, placental examination may be useful in detecting such metabolic storage disorders in the fetus, which usually present as vacuolization of placental cells. We describe a rare case of recurrent hydrops that was detected by placental examination. Through light microscopy, electron microscope (EM) studies and beta-glucocerebrosidase activity the disease was identified as Gaucher's disease.

Adult↗

Platelet-derived growth factor, basic fibroblast growth factor, and interferon gamma increase type IV collagen production in human fetal mesangial cells via a transforming growth factor-beta-dependent mechanism.

BACKGROUND: Glomerulosclerosis is characterized by glomerular accumulation of extracellular matrix following mesangial cell proliferation. The precise pathomechanism of glomerulosclerosis is still undetermined. Platelet-derived growth factor (PDGF) and basic fibroblast growth factor (b-FGF) are known to be mitogenic for mesangial cells, and interferon gamma (IFN-gamma) is known to have an inhibitory effect on mesangial cell proliferation. We attempted to clarify the role of these cytokines on mesangial matrix production using cultured human fetal mesangial cells (HMC). METHODS: HMC were incubated with these cytokines for 24-72 h and the levels of type IV collagen and TGF-beta in the cell supernatants were measured by enzyme immunoassay. RESULTS: PDGF, b-FGF, and IFN-gamma stimulated type IV collagen production by HMC in a dose- and time-dependent manner. The anti-TGF-beta neutralizing antibody clearly inhibited their stimulatory effect on type IV collagen production. PDGF and b-FGF also stimulated TGF-beta production by HMC in a dose-dependent manner, although IFN-gamma did not. CONCLUSION: PDGF, b-FGF, and IFN-gamma stimulate type IV collagen production in cultured HMC via a TGF-beta-dependent mechanism.

Antibodies↗

Aluminum-induced 1-->3-beta-D-glucan inhibits cell-to-cell trafficking of molecules through plasmodesmata. A new mechanism of aluminum toxicity in plants.

Symplastic intercellular transport in plants is achieved by plasmodesmata (PD). These cytoplasmic channels are well known to interconnect plant cells to facilitate intercellular movement of water, nutrients, and signaling molecules including hormones. However, it is not known whether Al may affect this cell-to-cell transport process, which is a critical feature for roots as organs of nutrient/water uptake. We have microinjected the dye lucifer yellow carbohydrazide into peripheral root cells of an Al-sensitive wheat (Triticum aestivum cv Scout 66) either before or after Al treatment and followed the cell-to-cell dye-coupling through PD. Here we show that the Al-induced root growth inhibition is closely associated with the Al-induced blockage of cell-to-cell dye coupling. Immunofluorescence combined with immuno-electron microscopic techniques using monoclonal antibodies against 1-->3-beta-D-glucan (callose) revealed circumstantial evidence that Al-induced callose deposition at PD may responsible for this blockage of symplastic transport. Use of 2-deoxy-D-glucose, a callose synthesis inhibitor, allowed us to demonstrate that a reduction in callose particles correlated well with the improved dye-coupling and reduced root growth inhibition. While assessing the tissue specificity of this Al effect, comparable responses were obtained from the dye-coupling pattern in tobacco (Nicotiana tabacum) mesophyll cells. Analyses of the Al-induced expression of PD-associated proteins, such as calreticulin and unconventional myosin VIII, showed enhanced fluorescence and co-localizations with callose deposits. These results suggest that Al-signal mediated localized alterations to calcium homeostasis may drive callose formation and PD closure. Our data demonstrate that extracellular Al-induced callose deposition at PD could effectively block symplastic transport and communication in higher plants.

Aluminum↗

C-Type natriuretic peptide inhibits proliferation and monocyte chemoattractant protein-1 secretion in cultured human mesangial cells.

BACKGROUND: Mesangial cell proliferation and matrix accumulation are hallmarks of various progressive glomerular diseases. We examined whether C-type natriuretic peptide (CNP) that is known to regulate the proliferation of vascular smooth muscle cells could modulate these pathological processes using human glomerular mesangial cells (GMCs) in culture. METHODS: Proliferation of GMCs cultured with different concentrations of CNP-22 for 48 h was determined by a colorimetric assay using a tetrazolium salt. Monocyte chemoattractant protein-1 (MCP-1) and type IV collagen secretion into the culture media by GMCs in the presence or absence of CNP-22 were evaluated by ELISA. Expression of mRNA for natriuretic peptide receptor B (NPR-B), a specific receptor for CNP, was examined by reverse transcription polymerase chain reaction (RT-PCR). RESULTS: CNP-22 (1-10 microM) inhibited serum-induced GMC growth in a dose-dependent manner. The amount of MCP-1 in the culture supernatant was increased approximately 2.4-fold by 5 microg/ml of lipopolysaccharide. This increase was inhibited by CNP-22 at 0.1-1 microM in a dose-dependent fashion. CNP-22 (10 microM) inhibited GMC type IV collagen secretion stimulated by 20 ng/ml of platelet-derived growth factor. Expression of NPR-B mRNA was confirmed in GMCs by RT-PCR. CONCLUSIONS: CNP suppresses GMC proliferation and MCP-1 and type IV collagen secretion by GMCs. It may have a therapeutic potential against human proliferative glomerular diseases, especially those with the involvement of monocytes.

Cell Division↗

Mutation analysis of transforming growth factor beta type II receptor, Smad2, Smad3 and Smad4 in esophageal squamous cell carcinoma.

Mutations of the transforming growth factor beta type II receptor (TGFbetaRII) gene and Smad family genes have been observed in several human cancers. However, there has been no report on mutation analysis of the entire coding regions of these genes in esophageal cancer, and the role of these genes in the development of esophageal cancer remains unknown. We performed polymerase chain reaction-single strand conformation polymorphism analysis of TGFbetaRII, Smad2, Smad3 and Smad4 genes and microsatellite assay in 20 esophageal squamous cell carcinomas (ESCC). We detected polymorphisms at exon 2 of Smad3 and intron 6 of Smad4. No mutation was found in TGFbetaRII, Smad2, Smad3 and Smad4 genes. These results suggest that mutation of TGFbetaRII, Smad2, Smad3 and Smad4 genes is a rare event in ESCC.

Base Sequence↗

[The role of daunorubicin in induction therapy for adult acute myeloid leukemia].

The relationship between the total dose of daunorubicin (DNR) in induction therapy and the treatment outcome were evaluated based upon individualized doses of DNR during induction therapy for patients with acute myeloid leukemia(AML). Ninety-two previously untreated adult AML patients admitted to our hospital were analyzed for the dose of DNR required for complete remission (CR), the CR rate, disease-free survival (DFS) and overall survival (OS). The induction therapy consisted of DNR (40 mg/m2/d, i.v., from D 1 until the marrow was hypoplastic), Ara-C, prednisolone, and/or 6-thioguanine. Eighty-three out of 92 patients were assessable. Sixty-three patients entered CR (76%), of whom 52 attained CR with the first course of induction therapy. The 10-year DFS and OS rates were 31.2% and 42.3%, respectively. The median total dose of DNR in the induction therapy was 280 mg/m2 (120-480 mg/m2), which was not influenced by initial WBC count, or FAB type. These results indicate that when the dose is linked to the observed tumor response, the optimal dose of DNR in the induction therapy is around 280 mg/m2 (40 mg/m2 x 7 times), which is higher than the conventional dose of 40-60 mg/m2 for 3 days. The higher dose of DNR in the induction therapy for adult AML should be selected when the feasibility of a new drug is evaluated in a randomized trial.

Adolescent↗

[Whole-body oxygen consumption at different temperatures during cardiopulmonary bypass].

For evaluation of the adequacy of tissue perfusion during cardiopulmonary bypass (CPB), whole-body oxygen consumption rates at different body weights and temperatures are basic and important data. But few studies have analyzed the oxygen consumption estimated from real-time data during CPB in clinical situations. We analyzed retrospectively the oxygen consumption at different body weights (BW) during normothermia (VO2 37) and the oxygen consumption ratio at different body temperatures (BT; %VO2X; X = BT) from the CPB charts of 189 cases. From these charts, 877 data points for oxygen consumption during total CPB were calculated by Fick's law. By statistical analysis of these data, we derived the following formulae: VO2 37 (ml/kg/min) = 7.6481 x BW0.0679, R2 = 1.0 (BW < 8 kg) VO2 37 (ml/kg/min) = 32.394 x BW-0.625, R2 = 0.92 (BW > or = 8 kg) %VO2X (%) = 4 x 10(-5) x BT4.0777, R2 = 0.42. These formulae indicate that (1) the whole-body oxygen consumption during total CPB can be measured by subtracting the oxygen consumption associated with circulatory and respiratory processes from the oxygen consumption derived from the basal metabolism; and (2) although the change in oxygen consumption induced by hypothermia is variable depending on body weight, the rate of change shows no difference regardless of the patient's weight.

Body Weight↗

[Surgical removal of left atrial tumor originating from mitral annular calcification in a chronic hemodialysis patient: a case report].

A 66-year-old female with a 3-year history hemodialysis suffered from cerebral infarction and revealed a tumor of left atrium by echocardiography at another hospital. She was referred to our hospital for surgery of left atrial tumor. The tumor was a round dense echogenic mass at the annular position of the posterior mitral leaflet by echocardiography. Surgical removal of the tumor was carried out because the lesion produced embolization. Histological examination revealed the tumor to be calcifications.

Aged↗