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Biomedical subjects

Y Shinji

Publications and source records attributed to Y Shinji.

At least 19 recordsLinked to original sources
PubMed2005

Implications of corpus gastritis, atrophy and cyclooxygenase in the development of gastric erosions after curing Helicobacter pylori infection.

BACKGROUND: Helicobacter pylori eradication decreases recurrence of peptic ulcers with marked improvement in histological inflammation, but gastric mucosal injuries may be developed even after eradication. PURPOSE: To investigate the mechanisms responsible for the development of gastric erosions after eradication, we analysed the relationship between clinicopathological risk factors and the occurrence of gastric erosion after curing H. pylori infection. PATIENTS: Sixty patients underwent endoscopy before, and 3, 6 and 12 months after the completion of H. pylori eradication. METHODS: Risk factors associated with the development of gastric erosions after eradication were assessed by multivariate analysis, and cyclooxygenase-1 and -2 immunoreactivity was histologically examined in the gastric mucosa before and after eradication. RESULTS: The cumulative prevalence of gastric erosions after H. pylori eradication was 38.3% within 1 year. Using multivariate analysis, corpus gastritis scores (inflammation score+activity score), corpus atrophy scores and an age of more than 50 years were found to be independent factors associated with the development of gastric erosion after eradication with odds ratios of 7.39, 0.13 and 5.00, respectively. Cyclooxygenase-2 immunoreactivity of the corpus was decreased for the non-erosion group after eradication, but not for the erosion group. CONCLUSIONS: Severe gastritis or less severe atrophy in oxyntic glands but not in pyloric glands before eradication may be involved in the development of gastric erosions after curing H. pylori infection.

Age Factors↗
PubMed2005

Preventive therapy for non-steroidal anti-inflammatory drug-induced ulcers in Japanese patients with rheumatoid arthritis: the current situation and a prospective controlled-study of the preventive effects of lansoprazole or famotidine.

BACKGROUND: There is a lack of evidence for the efficacy of preventive medications for peptic ulcers (PUs) among long-term users of non-steroidal anti-inflammatory drugs (NSAIDs) in Japan. AIM: To estimate the preventive effect by normal dose, not high-dose histamine-H2 receptor antagonists (H2RA) for NSAID-induced ulcers. METHODS: We designed two different studies to assess the efficacy of anti-ulcer agents in rheumatoid arthritis (RA) in patients treated over a long term with NSAIDs. An investigative survey divided patients into those not taking anti-ulcer agents (non-medication group); those taking mucosal protective agents (mucosal protectant group), H2RA (H2RA group), proton pump inhibitors (PPI group), or a prostaglandin E1 analog (PG) (PG group). The second study compared prospectively the preventive effects of either famotidine 20 mg bd (famotidine group) or lansoprazole 15 mg daily (lansoprazole group) in patients with PU scars. RESULTS: The prevalence of PU in the H2RA group was significantly lower compared to the mucosal protectant group (P < 0.05), and the mucosal protectant group was not significantly different to the non-medication group. The prospective study revealed that the PU onset rate of the famotidine group was 8% (1/13), and lansoprazole group was 15% (2/13), indicating no significant differences between the two. CONCLUSIONS: In Japan, normal-dose H2RA is expected to be a new PU preventive treatment strategy in patients requiring long-term NSAID therapy.

2-Pyridinylmethylsulfinylbenzimidazoles↗
PubMed2003

Monocyte chemoattractant protein 1 (MCP-1) released from Helicobacter pylori stimulated gastric epithelial cells induces cyclooxygenase 2 expression and activation in T cells.

BACKGROUND: and aims: To clarify the interaction between gastric epithelial and mucosal T cells, we examined the role of cytokines released from epithelial cells in response to Helicobacter pylori water extract protein (HPWEP) in regulating T cell cyclooxygenase 2 (COX-2) expression and activation. METHODS: Media from MKN-28 cells incubated with HPWEP for 48 hours were added to Jurkat T cells and human peripheral T cells. C-C and CXC chemokine concentrations in MKN-28 cell media, and COX-2 expression, interferon gamma (IFN-gamma), and interleukin (IL)-4 secretions in T cells were determined by western blot analysis and ELISA methods. Distributions of COX-2 positive T cells and monocyte chemoattractant protein 1 (MCP-1) in tissue specimens with H pylori associated gastritis were determined as single or double labelling by immunohistochemistry. RESULTS: MCP-1, IL-7, IL-8, and RANTES were detected in media from MKN-28 cells incubated with HPWEP. Media as a whole, and MCP-1 alone, stimulated COX-2 expression and peripheral T cell proliferation. Anti-MCP-1 antibody inhibited media stimulated COX-2 mRNA expression in Jurkat T cells. Media stimulated IFN-gamma but not IL-4 secretion from peripheral T cells, while MCP-1 stimulated IL-4 but not IFN-gamma secretion. Both stimulated cytokine release, and peripheral T cell proliferation was partially inhibited by NS-398, a specific COX-2 inhibitor. In mucosa with gastritis, COX-2 was expressed in T cells and MCP-1 was localised mainly in epithelial and mononuclear cells. MCP-1 levels and the intensity of COX-2 expression in tissue samples were closely related. CONCLUSIONS: Cytokines such as MCP-1, released from gastric epithelial cells in response to HPWEP, seem to modulate T cell immune responses, at least in part via COX-2 expression.

Blotting, Western↗
PubMed2002

Effect of acid suppression therapy on development of gastric erosions after cure of Helicobacter pylori infection.

BACKGROUND: Helicobacter pylori eradication markedly improves histological inflammation and decreases peptic ulcer recurrence, but little is known about the subsequent development of gastric mucosal injury. AIM: To investigate whether acid suppression treatment after eradication influences the development of gastric erosions. METHODS: Eighty-one patients (gastritis or peptic ulcer) after successful H. pylori eradication were divided into two groups: 40 received an H2-blocker for 6 months (H2-blocker-positive) and 41 received no treatment (H2-blocker-negative). Endoscopy was performed before, and at 3 and 6 months after completion of eradication. RESULTS: Cumulative prevalence of gastric erosions in the H2-blocker-positive group was significantly lower than in the H2-blocker-negative group, 25% vs. 42%, respectively. In the H2-blocker-negative group but not the H2-blocker-positive group, the cumulative prevalence of gastric erosions after eradication was higher in patients with less severe corpus atrophy or more severe corpus gastritis. CONCLUSIONS: Development of gastric erosions after H. pylori eradication may be controlled by acid suppression treatment. Less severe atrophy or more severe gastritis in oxyntic glands before eradication may be involved in the development of gastric erosions. These results support the idea that recovery of acid secretion may be one of factors for development of gastric mucosal erosions after successful eradication.

Biopsy↗
PubMed1998

Retrospective study on the impact of hepatitis C virus infection on kidney transplant patients over 20 years.

BACKGROUND: The majority of chronic hepatitis is ascribable to hepatitis C virus (HCV) infection, whereas the clinical impact has not been understood in kidney transplant recipients. Our current study was carried out to assess the impact of HCV infection on kidney recipients over the long-term, and to investigate the effect and risk of interferon-alpha (IFN-alpha) therapy for chronic active hepatitis C. METHODS: Hepatitis B surface antigen (HBsAg) and antibody to HCV (HCVAb) were examined prospectively and retrospectively in 280 patients, who underwent kidney transplants in the period from 1973 to 1996. The patient survival rate, the graft survival rate, the incidence of liver dysfunction and the cause of mortality among the HCV infected and noninfected groups were analyzed. IFN-alpha therapy was performed on 10 patients with chronic active hepatitis C. RESULTS: Prevalence of the hepatitis virus was quite high at 34.3% (96/280): the frequency of the HBsAg carrier was 3.2% (9/280), that of the HCVAb carrier was 28.6% (80/280) and that of the both carriers was 2.5% (7/280). The other 184 cases (65.7%) were negative for both HBsAg and HCVAb. Liver dysfunction developed at the significantly higher incidence of 55% in HCVAb carriers compared to the 9.2% of the noninfected group (P<0.01). HCVAb carriers had a poor survival rate in the second decade compared to the noninfected group: 83.7% vs. 88.91% for 10-year survival (P=0.44) and 63.9% vs. 87.9% for 20-year survival (P<0.05). The poor survival rate was a result of the mortality from liver disorder. Five patients died of such disease in the infected groups whereas no noninfected patient died in the same period (p<0.01). As the result of IFN-alpha therapy, biochemical activity normalized or improved in eight cases, whereas the HCV-RNA titer was reduced only in three patients. Only one patient maintained normal biochemical markers and undetectable levels of HCV-RNA for 2 years after treatment. The therapy was discontinued for five patients with the adverse effects of acute rejection, deterioration of diabetes, and depression. CONCLUSIONS: HCV infection has a significant impact on kidney transplant recipients over the long term and in particular affects them in the second decade. Our pilot study revealed only partial efficacy of IFN-alpha therapy for HCV-infected recipients, but with the high risk of acute rejection.

Adult↗
PubMed1998

A 20-year case study of a kidney transplant recipient with chronic active hepatitis C: clinical course and successful treatment for late acute rejection induced by interferon therapy.

BACKGROUND: The influence of hepatitis C virus (HCV) infection has been discussed in kidney transplantation. Our case study focused on four points: the clinical course of an HCV-infected recipient; the pathogenesis of hepatic disorders in such a patient; interferon (IFN)-alpha therapy; and the risk of IFN-alpha therapy. METHOD: A patient was suspected of acquiring HCV via transfusion at kidney transplant. He was examined several times serologically, virologically, endoscopically, and pathologically during a 20-year follow-up. RESULTS: Abnormal biochemical markers were found within a month after transplantation but recovery occurred without any treatment. Within 3 years postoperatively, hepatic disorder developed including peliosis hepatis, nodular regenerative hyperplasia, and cholestasis. These pathological conditions were ascribed to immunosuppressants: cyclophosphamide and azathioprine. Abnormal chemical markers decreased to normal values for 4 consecutive years with the substitution of cyclophosphamide and azathioprine for mizoribine. During the subsequent 13 years, the patient developed chronic hepatitis with clinical and morphological features of hepatitis C infection. Anti-HCV antibody was positive from the second post-transplant year and HCV genome was detected in the 17th year. IFN-alpha therapy was initiated in the 17th year and resulted in normal transaminase activities with no effect on viremia. However, acute cellular rejection developed. The rejection was steroid resistant but responsive to OKT3. CONCLUSION: HCV might remain latent for approximately 7 years even in kidney recipients unless toxic hepatitis occurs. Hepatotoxic drugs may cause a wide spectrum of liver diseases in HCV carriers as a result of the overload of immunosuppressants on hepatocytes. IFN-alpha could induce acute cellular rejection even in the 17th year. Such acute rejection can be reversible with OKT3.

Adult↗
PubMed1997

Laparoscopic prediction of hepatocellular carcinoma in cirrhosis patients.

Previously, laparoscopic studies have not been successful in predicting the occurrence of small hepatocellular carcinoma because cirrhotic patients had not been separated into groups of those who developed small hepatocellular carcinoma under 3 cm in diameter, and those who did not. Retrospective examination with better separation of the two groups gave improved results. Of the 26 laparoscopic findings, only the presence of large complex regenerative nodules was closely associated with the occurrence of subclinical small hepatocellular carcinoma. The study of other cirrhotic patients with and without large complex regenerative nodules gave a cumulative hepatocellular carcinoma occurrence rate of 73% for patients who had these nodules by the third year after laparoscopy. In contrast, the rate for patients without such nodules was 6%, showing a significant difference (P < 0.05) between the two groups. We concluded that the laparoscopic finding of large complex regenerative nodules of liver cirrhosis can be used to predict the occurrence, or a complication, of subclinical small hepatocellular carcinoma.

Carcinoma, Hepatocellular↗
PubMed1997

Recombinant interferon-alpha-2a for treatment of chronic hepatitis C: results of a multicenter randomized controlled dose study.

To compare the efficacy of low and relatively high dosages of recombinant interferon (IFN)-alpha-2a in Japanese patients with chronic hepatitis C, as well as to characterize the type of patients who will respond well to a low-dosage treatment, 88 patients with histologically proven chronic hepatitis C were randomly assigned to two treatment groups; one treated with IFN-alpha-2a 6 MU daily for 2 weeks followed by 6 MU three times weekly for 22 weeks (6-MU group), and another given the same initial treatment followed by 3 MU three times weekly for 22 weeks (3-MU group). The rate of sustained normalization of ALT 6 months after the cessation of treatment was 33% in the 3-MU group and 40% in the 6-MU group (p = 0.64). In addition, there was no difference in elimination of serum HCV-RNA 6 months after the cessation of treatment between the 3-MU group (26%) and 6-MU group (29%). Multivariate stepwise regression analysis revealed that serum HCV-RNA level (p = 0.0035) and platelet count (p = 0.0009) were independent variables useful in predicting a sustained response of ALT. The sustained response rate of ALT in patients with a serum HCV-RNA level less than 10(5) copies/ml and serum platelet level above 15 x 10(4)/microliter was 71%, whereas that in patients with a serum HCV-RNA level above 10(5) copies/ml and serum platelet level less than 15 x 10(4)/microliter was 12%. These results indicate that a high rate of sustained response to IFN therapy can be expected in chronic hepatitis C patients with a low serum level of HCV-RNA and a high level of platelets, even if treated with a low dose of IFN.

Antiviral Agents↗
PubMed1997

Malignant lymphoma originating in the jejunum of a long-term follow-up case of protein-losing enteropathy.

A 50-year-old female patient, who had been followed for 15 years for protein-losing enteropathy, was hospitalized due to epigastric pain. Examination on admission revealed that the patient was in the sub-ileus state. On the 26th day after admission, she complained of severe abdominal pain and shortly after she went into shock. The emergency laparotomy documented intestinal perforation and a tumor. The perforated site was right at the middle of tumor. The histological and histochemical studies identified the tumor as malignant lymphoma of B lymphocyte lineage. As far as we know, this is the third case of malignant lymphoma occurring in the jejunum in a patient with protein-losing enteropathy in Japan. The possible relationship between lymphomas and protein-losing enteropathy is discussed.

Female↗
PubMed1996

Consecutive evaluation of immunoglobulin M and G antibodies against hepatitis E virus.

Hepatitis E virus (HEV) infection is sporadic in the Guangzhou city southern China. However, the evaluation of antibodies to HEV during consecutive time periods after infection has not been reported. We utilized enzyme immunosorbent assay (ELISA) to defect IgM and IgG anti-HEV in consecutive serum specimens from patients with acute hepatitis E and compared that data with detection rates of IgM and IgG anti-HAV in patients with acute hepatitis A. IgM anti-HEV can be detected as early as 4 days after onset of disease symptoms in some patients. The detection rate of IgM anti-HEV is significantly higher in specimens collected within 4 weeks (95%) of onset than in those specimens collected 4 to 18 weeks after onset (67.6%) (P < 0.005). IgM anti-HEV had a similar pattern to IgM anti-HAV and can be used as a marker of acute HEV infection. In contrast with IgG anti-HAV, 56.8% of the specimens did not contain detectable levels of IgG anti-HEV (P < 0.005). One should be cautioned against making a diagnosis of HEV infection solely by the currently available assays for IgG anti-HEV. In conclusion, IgM anti-HEV can be used as a reliable and sensitive marker for recent HEV infection, but serum specimens should be collected within 4 weeks after onset of symptoms to avoid false-negative results. In contrast, we should be aware of the failure to develop IgG anti-HEV in some patients. These patients carry the risk of reinfection.

Acute Disease↗
PubMed1994

Laparoscopic study of peliosis hepatis and nodular transformation of the liver before and after renal transplantation: natural history and aetiology in follow-up cases.

Although peliosis hepatis and nodular transformation of the liver can occur after renal transplantation, their prevalence has not been well defined. To investigate the incidence of these complications, 137 laparoscopies were studied, 52 in 50 cases before and 85 in 66 cases after renal transplantation. To elucidate the aetiology and natural history of these diseases, cases were followed up by repeated laparoscopies. Peliosis was observed after transplantation (before: n = 1, after: n = 15 [22%], p < 0.005). Nodular transformation was seen only after transplantation (n = 5 [7%]), and was accompanied by peliosis (n = 4, p < 0.01). On observation before and after transplantation in the same cases, these diseases appeared after transplantation (peliosis: n = 9, p < 0.005; nodular transformation: n = 2). In follow-up cases, these diseases were confirmed after the discontinuation of or the controlled administration of immunosuppressants. The aetiology of the micronodular transformation which appeared following peliosis in a case treated without cyclosporin was shown to be azathioprine. However, the macronodular transformation observed in two cases treated with both azathioprine and cyclosporin seemed to be due to cyclosporin. This suggests that cases of peliosis hepatis and nodular transformation which appear after renal transplantation are associated with immunosuppressants, and that cyclosporin treatment may also affect the morphogenesis of nodular transformation.

Adult↗
PubMed1994

[Usefulness of various echographic examinations in the study of extrapulmonary lesions of sarcoidosis].

Echocardiographic study performed by Ohmori and others revealed a statistically significant difference between sarcoidosis patients with and without left ventricular perfusion defects in regards to LVDd, LVDs, LVEF, %FS, WT and EPSS. Echocardiography is a useful noninvasive tool in addition to Thallium-201 myocardial scintigraphy, in detection of myocardial involvement of sarcoidosis. Marked swelling of abdominal lymph node and splenomegaly was found by abdominal echography, in the sarcoid patients at onset as well as in the chronic stage. Both abdominal echography and CT revealed a hepatic sarcoid mass lesion in patients with and without hepatic dysfunction. Improvement of these abdominal echographic abnormalities correlated well with clinical improvement of sarcoid lesion. In addition, muscular echographic abnormalities were found in muscular sarcoid lesion. It can be said that echography is useful in the detection and follow up of extrapulmonary lesions of sarcoidosis.

Cardiomyopathies↗
PubMed1990

Examination of islets in the pancreas biopsy specimens from newly diagnosed type 1 (insulin-dependent) diabetic patients.

We attempted to examine the immunopathological change of the pancreatic islets of newly diagnosed Type 1 (insulin-dependent) diabetic patients and thereby to obtain useful information for the therapy of the patients. For this purpose, pancreas biopsy under laparoscopy was performed 2-4 months after the onset of Type 1 diabetes in seven newly diagnosed patients. All biopsies were performed safely without any complications. Immunohistochemical examination of the biopsy specimens revealed a marked decrease of insulin-containing cells, preservation of glucagon-containing cells, and various degrees of expression of MHC class I and class II antigens in islet cells and in endothelial cells within and around the islets. Signs of active autoimmune phenomena, e.g. lymphocytic infiltration or immunoglobulin deposition in islets, were not detected in any of these patients by light microscopical evaluation. We conclude that pancreas biopsy under laparoscopy has shown various immunological changes in the islets of newly diagnosed Type 1 diabetic patients. Pancreas biopsy, however, may not be suitable under the present protocol for the selection of patients for immunotherapy because of problems including sampling errors.

Adult↗
PubMed1990

[Increased incidence of hepatocellular carcinoma in abstinent patients with alcoholic cirrhosis].

The morphological features of alcoholic liver diseases were followed up for a long period in patients who continued alcoholic intake and those in whom alcoholic intake was discontinued or reduced. In the continued alcoholic intake group, liver cirrhosis, which had not been seen at the first examination, appeared in 17 of the 25 cases, whereas in the abstinence or alcohol reduction group, only 6 of the 25 cases developed liver cirrhosis. Thus, the incidence of liver cirrhosis was evidently higher in patients who continued alcoholic intake. In the continued alcoholic intake group, 11 cases had liver cirrhosis at the first examination, with 2 of these 11 cases developing hepatoma during the follow-up period. In the abstinence or alcohol reduction group, 34 cases had liver cirrhosis at the first examination and 17 of them developed hepatoma. Thus, the incidence of hepatoma which developed from liver cirrhosis was higher in the abstinence or alcohol reduction group. Of the 38 cases who discontinued alcoholic intake, 12 developed hepatoma 4 years (on the average) after the beginning of abstinence. Of the 21 cases who reduced the amount of alcoholic intake, 5 developed hepatoma 9 years and 2 months (on the average) after reduction of alcoholic intake. Among others, patients who suddenly discontinued alcoholic intake after many years of heavy drinking tended to develop hepatoma in a relatively short time after abstinence.

Alcohol Drinking↗
PubMed1990

[A case of pleural effusion secondary to breast carcinoma responding to treatment based upon thoracoscopic findings].

Patients with metastatic breast carcinoma often present symptomatic pleural effusions. A 67-years-old woman, who had undergone right radical mastectomy 7 years previously for right breast carcinoma, developed massive right pleural effusion. Thoracoscopy revealed local metastasis in the center of the parietal mediastinal pleura. On biopsy, it was found to be adenocarcinoma which was considered to have invaded the pleura directly from the mediastinum. She was treated with linac X-ray irradiation focused on the pleural metastasis and systemic chemotherapy (CMF), and resulted in a gradual decrease and final disappearance of the pleural effusion.

Adenocarcinoma↗