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H Kon

Publications and source records attributed to H Kon.

At least 37 records · Page 2Linked to original sources
PubMed1997

[Evaluation of intra-arterial infusion chemotherapy for liver metastasis from gastric cancer].

We evaluated the result of intra-arterial infusion chemotherapy on liver metastasis from gastric cancer. Of 92 cases of metastatic liver tumor, 17 cases received intra-arterial infusion chemotherapy after primary resection. For comparison, we assigned the 17 cases to two groups according to the infused agents. One group was treated with the combination therapy of 5-FU, epirubicin and MMC (FEM group: n = 7), and another with other antineoplastic agents (non-FEM group: n = 10). In the FEM group, the response rate, 1-year survival rate and 50% survival period were 33.3%, 51.4%, 430 days, respectively, while those of the non-FEM group were 10.0%, 10.0%. 147 days. Although there was no significant difference (p = 0.0951), improvements in survival rate and survival period were observed. This implies the possibility that intra-arterial infusion chemotherapy, especially the combination therapy of FEM, is an effective treatment for liver metastasis from gastric cancer.

Aged↗
PubMed1997

[Complication due to arterial infusion chemotherapy for liver metastasis from colorectal cancer].

OBJECTIVES: Arterial infusion chemotherapy is considered to be an extremely effective treatment for liver metastasis from colorectal cancer in terms of its tumor reduction and preventing recurrence in residual liver after resection. However, there still remain some unclear points as to the influence on hepatic artery and bile duct when this treatment is used over the long term. We report some conclusions obtained by examining cases of hepatic arterial occlusion (stenosis) and biliary complication who received this treatment. MATERIALS AND METHODS: Thirty-six cases who received this treatment over 3 months were the objects of this study, with the aim of direct effect against metastatic focus (21 cases) and prevention of recurrence in residual liver (15 cases). The ages were from 27 to 81; 22 cases were male and 14 were female. Indwelling routes of catheter were gastroduodenal artery (GDA) in 28 cases and femoral artery (FA) in 8 cases. Intermittent high-dose infusion (WHF: 5-FU 1,000 mg/m2/5 hrs qw) was adopted as the method. RESULTS: Hepatic arterial occlusion or stenosis was observed in 12 cases (GDA: 10; FA: 2). There seemed to be no correlation with the total dosage of 5-FU or the number of administrations. Even when hepatic arterial occlusion or stenosis occurred, no change was observed in liver function, and there no death was caused by this. However, CT showed a low-density area followed by atrophy in the right lobe in one case with right hepatic arterial stenosis, despite normal portal blood flow. Of the 6 cases which developed obstructive jaundice, 4 were due to the increase of metastatic focus or lymph nodes, and 1 case without dilatation of bile duct died from suspected sclerosing cholangitis. In this case, ALP had been increasing since 1 month before the onset of jaundice. Another case which developed biloma accompanied by the increase of serum bilirubin improved by discontinuance of chemotherapy. CONCLUSION: Since arterial infusion chemotherapy for liver metastasis from colorectal cancer causes hepatic arterial occlusion (stenosis) at a high rate, early detection of abnormalities by liver function test and imaging diagnosis which leads to early treatment is important.

Adult↗
PubMed1996

Molecular analysis of ocular adnexal lymphoid proliferations. Characteristics of immunoglobulin VH, D and J segment usage.

We investigated the molecular characteristics of six cases of ocular adnexal lymphoid proliferation. Although their clinical diagnoses varied, all of them were diagnosed as having malignant lymphomas by immunohistochemical examinations and molecular approaches. Proliferating cells showed the B cell phenotype, positive for L26/CD20 and negative for UCHL1/CD45RO, and genotypic study by Southern blotting revealed that all cases had gene rearrangements of the immunoglobulin heavy chain with or without those of the kappa (kappa) light chain. Epstein-Barr virus infection was not identified. Usage of variable domains of the immunoglobulin heavy chain was analyzed. Subgroup 3 of the VH gene was present relatively often, in 3 of 6 cases, perhaps due to its having the largest number of VH gene segments. On the other hand, an unexpectedly high frequency of the DLR family of the D gene segment was observed by sequencing the third complementarity determining region. These molecular characteristics in ocular adnexal lymphoid neoplasms might be related to the clinical course.

Adult↗
PubMed1996

Study of the changes of serum hyaluronic acid during porcine liver transplantation: influence of warm ischemia.

Twelve porcine liver transplantations were performed to investigate whether serum hyaluronic acid (HA) serves as a marker of warm ischemic injury. Group 1 was a control without warm ischemia (n = 7), and pigs in Group 2 were sacrificed by intracardiac KCl injection 60 min before harvesting (n = 5). All pigs survived more than 4 days in Group 1. In Group 2, all died within 2 days due to graft failure. Arterial and hepatic venous glutamic-oxaloacetic transaminase (GOT) in Group 2 were higher after revascularization. However, there were no differences between the 2 groups in arterial and hepatic venous HA levels. HA clearance by the graft also showed no differences between the groups. Although GOT reflected the degree of warm ischemia, HA and its hepatic clearance were not influenced by warm ischemic damage. In conclusion, HA was not thought to serve as a marker of liver injury when the graft suffered from warm ischemia.

Animals↗
PubMed1996

Optimal oxygen tension conditions for functioning cultured hepatocytes in vitro.

With a view toward furthering the development of artificial liver systems, we have been culturing hepatocytes in vitro. The object of this research was to investigate the ideal conditions of oxygen tension for the efficient functioning of hepatocytes. Viable hepatocytes isolated from rat livers were cultured under five different oxygen tensions: 5, 10, 20, 50 and 90% O2. DNA contents, gluconeogenesis, urea synthesis, adenosine triphosphate (ATP) levels, and lipid peroxidation of hepatocytes were evaluated. Under the 5% oxygen conditions, the function of hepatocytes was very inferior and was accompanied by a low ATP level. However, hepatocytes cultured under 90% oxygen tension functioned less effectively than the control (20% O2) with elevated lipid peroxidation. The data in this study suggest that the optimum oxygen condition for cultured hepatocytes is 10 approximately 50%, and that especially under conditions of 20% oxygen tension, i.e., that of the ordinary atmosphere, hepatocytes can function most effectively.

Adenosine Triphosphate↗
PubMed1995

Mucinous cystadenoma of appendix concomitant with perityphlic granuloma.

We describe a case of mucinous cystadenoma of the appendix with perityphlic granuloma. The patient developed a hard palpable mass in the right lower quadrant and barium enema induced irregular bowel wall at the cecum. Based on a preoperative diagnosis of carcinoma of the appendix, we performed a laparotomy. On operation, we found a tumor mass in the region of the appendix; the mass adhered strongly to the retroperitoneum and cecum. Right hemicolectomy was carried out on a diagnosis of carcinoma of the appendix. Microscopic examination revealed mucinous cystadenoma of the appendix with perityphlic granuloma. Mucinous cystadenoma in the appendix is a rare tumor. In this patient, the tumor was accompanied by granuloma formation in adjacent tissues because of mucin expelled from the appendix. This case emphasizes that granuloma formation can make of difficult to differentiate mucinous cystadenoma in the appendix from cancer.

Appendiceal Neoplasms↗
PubMed1995

Influence of warm ischemia on isolation and primary culture of hepatocytes from rat liver for a hybrid artificial liver.

To assess the possibility of using hepatocytes from ischemic liver, as a bioreactor of a hybrid artificial liver, we investigated the influence of warm ischemia on the isolation and culture of hepatocytes in rats. Warm ischemia was induced by clamping the liver hilus and the animals were divided into 3 groups according to the duration of ischemia: group A (no ischemia), group B (10 minutes) and group C (20 minutes). Hepatocytes were isolated by the collagenase perfusion method and cultured for 5 days. The yield and viability of the isolated hepatocytes were lower in group C. Rate of attachment was decreased as the duration of ischemia increased. There was no significant difference observed in functions in culture. Sufficient hepatocytes, as a bioreactor, can be isolated and cultured from warm ischemic liver within 10 minutes. Though the number of available hepatocytes were diminished, hepatocytes procured from longer warm ischemic liver could be utilized as a bioreactor.

Analysis of Variance↗
PubMed1993

Separation and characterization of the C-terminal half molecule of bovine lactoferrin.

The C-terminal half molecule (C lobe) of bovine lactoferrin was isolated by mild tryptic hydrolysis of lactoferrin followed by gel filtration and ion-exchange chromatography. The identity of the fragment was established by determining its N-terminal and C-terminal amino acid sequences and comparing them with the amino acid sequence of intact lactoferrin. The isoelectric point of the C lobe ranged between pH 6.2 and 6.5 as measured by isoelectric focusing on polyacrylamide gels. The circular dichroic spectrum in the range of 250 to 350 nm of the C lobe differed slightly from that of intact lactoferrin. The pattern of lectin reactivity was similar for both the C lobe and intact lactoferrin. The C lobe showed partial antigenic identity with intact lactoferrin as demonstrated by the double immunodiffusion method, and pH dependence of iron binding of C lobe is the same as that of intact lactoferrin molecule.

Amino Acid Sequence↗
PubMed1992

[Effect of sex hormones on the onset of diabetic syndrome in WBN/Kob rats].

The effects of sex hormone on diabetic conditions were investigated in WBN/Kob strain rats, i.e., castrated or spayed, hormone-treated, and non-treated rats. The effects of sex hormone on glycosuria, body-weight change, glucose tolerance and histopathology of the pancreas were compared among these animals. There were no abnormal changes in these parameters in the non-treated females and estrogen-treated males. The glycosuria began to be observed from the age of about 30 weeks in the non-treated group and from the age of 52 weeks in the castrated group. In the female animals, this symptom began to appear from the age of 55 weeks in the testosterone-treated group and from the age of 72 weeks in the spayed group. Before the onset of the diabetic symptoms, glucose tolerance was impaired in these animals. Body weights of the castrated and estrogen-treated males were lower than that of the non-treated males, especially in the estrogen-treated males. Those of the spayed and testosterone-treated females were much heavier than that of the non-treated females. Testosterone treatment accelerated body-weight gain in the spayed female animals. Histopathological examination of the pancreas revealed atrophy of the aciner tissue and atrophy and disappearance of the islet cells similar to those of the non-treated WBN/Kob male rats in the castrated males, spayed females and testosterone-treated females. However, these changes were not observed in the non-treated females or estrogen-treated males. These findings suggest that female hormone suppressed the onset of hyperglycemia along with glycosuria and male hormone accelerates the onset of hyperglycemia in the WBN/Kob rats.

Animals↗
PubMed1990

On the mechanism of loss of deformability in human erythrocytes due to Heinz body formation: a flow EPR study.

The effects of phenylhydrazine (PHZ) and monomethylhydrazine (MMH) on the deformability of human erythrocytes and ghosts in relation to Heinz body formation are investigated using the sensitive flow EPR (electron paramagnetic resonance) method. The decrease in deformability starts even before Heinz body formation is recognized and is enhanced with PHZ as Heinz bodies are attached on the inner surface of the membrane, but remains at a low level in MMH-treated cells in which Heinz bodies are formed mostly away from the membrane surface. Dithioerythritol recovers part of the lost deformability by MMH but has no effect in PHZ-treated cells or in the ghosts. The membrane fluidity measurements by 12-doxyl stearate indicate that there are two distinct modes of spin-label interaction in PHZ-treated cell membrane, the one corresponding to more immobilization gaining with the PHZ concentration, while MMH has only minor effects on fluidity. The motional freedom of membrane proteins probed with maleimide label shows that the membrane binding of hemoglobin denatured with PHZ causes more immobilization than that with MMH. These observations and Fe(III) EPR absorptions of the treated cells and ghosts are interpreted on the basis of the difference in reaction products (denatured hemoglobin) by the two reagents: the ones with PHZ preferentially bind to the membrane proteins, such as band 3, resulting in a perturbation of the membrane viscoelastic properties, while MMH-denatured hemoglobins remain mostly in the cytosol as Heinz bodies, or in the polymeric form contributing to the internal viscosity.

Cyclic N-Oxides↗
PubMed1990

[A case of successfully managed acute asthmatic attack by cervical epidural block during mechanical ventilation].

A 47-year-old male suffering from an acute asthmatic attack was admitted in the morning. He was arrested on arrival. Following successful resuscitation, he was treated by using controlled ventilation with a Bennett 7200 respirator. Before starting mechanical ventilation, he was physically exhausted and had carbon dioxide retention (PaCO2 76.2 mmHg). The patient received dexamethasone 40 mg/day and theophylline 400 mg/day during the first 4 days. Despite the decrease in PaCO2 following mechanical ventilation, cycling pressure remained high (up to 50-70 cmH2O) even after 24 hours. Because of the risk of barotrauma due to high cycling pressure, we conducted cervical epidural block to reduce airway hyperreactivity to the endotracheal tube and endotracheal suctioning. Six to 10 ml of lidocaine with 1:200,000 epinephrine was administered every 1 or 2 hours. Within 4 hours after epidural block, airway pressure decreased to 30-40 cmH2O. Since then, requirements of sedative (diazepam) have decreased greatly to 10 mg/day. The patient was successfully extubated 4 days after admission. Finally, epidural block was continued for 6 days without any complication. We do not know how cervical epidural block works to reduce airway pressure. It might be beneficial to manage patients artificially ventilated during asthmatic attack.

Airway Resistance↗
PubMed1989

Effect of shear stress and free radicals induced by ultrasound on erythrocytes.

The present study was undertaken to elucidate the mechanism of hemolysis induced by ultrasound. Ar or N2O gas was used to distinguish between cavitation with or without free radical formation (hydroxyl radicals and hydrogen atoms). Free radical formation was examined by the method of spin trapping combined with ESR. After sonication of erythrocyte suspensions, several structural and functional parameters of the erythrocyte membrane--hemolysis, membrane fluidity, membrane permeability, and membrane deformability--were examined. Although free radical formation was observed in the erythrocyte suspensions sonicated in the presence of Ar, no free radical formation was observed in the presence of N2O. However, the hemolysis behavior induced by ultrasound was similar in the presence of Ar or N2O. The membrane fluidity, permeability, and deformability of the remaining unlysed erythrocytes after sonication in the presence of Ar or N2O were unchanged and identical to those of the control cells. On the other hand, after gamma irradiation (700 Gy), the hemolysis behavior was quite different from that after sonication, and the membrane properties were significantly changed. These results suggest that hemolysis induced by sonication was due to mechanical shearing stress arising from cavitation, and that the membrane integrity of the remaining erythrocytes after sonication was the same as that of control cells without sonication. The triatomic gas, N2O, may be useful for ultrasonically disrupting cells without accompanying free radical formation.

Electron Spin Resonance Spectroscopy↗
PubMed1989

Changes in levels of mucosal glycoprotein on cysteamine-induced duodenal ulcers in rats.

Duodenal ulcers were induced in rats by cysteamine administration. Time-course changes in duodenal hexosamine, blood flow and intragastric pH were measured, as well as changes in the susceptibility of Brunner's glands to concanavalin A (Con A) staining. Hexosamine contents in the duodenum decreased significantly at 5 and 24 h. In the control group, Brunner's glands were stained brown using Con A staining. One day after cysteamine administration, the extent of Con A staining markedly decreased. At 3 and 7 days, gland susceptibility to staining was essentially the same as that of the control group.

Animals↗