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Biomedical subjects

Tetsuya Nakamura

Publications and source records attributed to Tetsuya Nakamura.

95 records · Page 6Linked to original sources
PubMed2002

[Eradication therapy of Helicobacter pylori for elderly patients in Japan].

In Japan, an eradication therapy of Helicobacter pylori(H. pylori) for peptic ulcers of stomach and duodenum was approved by a health insurance since November 1, 2000. A method of an eradication therapy is as follows. Adult patients are received lansoprazole 30 mg, amoxicillin 750 mg, clarithromycin 200-400 mg at the same time twice daily for seven days. This therapy is based on a guideline of a Japanese association of Helicobacter Research. Many elderly patients have complications such as hypertension, cerebral vascular disturbance, heart failure and so on. Moreover, they often take a several medicine including NSAIDs(non-steroidal anti-inflammatory drugs). Therefore, you should pay attention especially to interaction of drugs when planning an eradication therapy of H. pylori for elderly patients.

2-Pyridinylmethylsulfinylbenzimidazoles↗
PubMed2002

Reoperation for a patient 25 years after a Starr-Edwards ball mitral valve was installed.

A 45-year-old female suffered from increasing dyspnea during exercise and edema of lower extremities from January 2000. She had undergone mitral valve replacement with Starr-Edwards ball prosthesis (model 6320) due to mitral valve regurgitation 25 years ago. The cardiac catheterization and echocardiography documented mitral, aortic and tricuspid valves regurgitation grade III. Left ventricular ejection fraction rate was 49% and the pressures of CVP, RA, RV and PA were also increased. Laboratory examination showed slight hemolytic anemia. Double valve replacement (ATS valve) and tricuspid annuloplasty were carried out in April 2000. Strut cloth wear was confirmed at operation. Her postoperative course was uneventful. We hereby review the published paper of all cases with an implanted Starr-Edwards ball valve who required redo valve replacement with over 15 years follow-up. We consider that cloth injury is the main cause for reoperation and it usually associated with hemolytic anemia; cloth wear not only involves the aortic position but also frequently involves the mitral position for over 15 years follow-up patients and can be corrected by reoperation. Cloth wear should be concerned for those surviving patients who have received the Starr-Edwards ball valve during long-term follow-up.

Anemia, Hemolytic↗
PubMed2002

Reconstitution of immune responses to Pneumocystis carinii pneumonia in patients with HIV infection who receive highly active antiretroviral therapy.

We describe a reconstitution syndrome of immune responses to Pneumocystis carinii pneumonia (PCP) in 2 HIV-infected individuals who received highly active antiretroviral therapy (HAART). Patient 1, who had been successfully treated for PCP 3 years before the initiation of HAART, developed cough and pulmonary shadows 6 weeks after the start of HAART. Patient 2 was introduced HAART immediately after completing the responsive treatment of PCP, and then showed dyspnea and diffuse pulmonary infiltrates 7 months later. Histologic findings of lung-tissue samples showed granulomatous tissue (patient 1) and organizing pneumonia with thickening of alveolar septa (patient 2), and immunohistochemical findings revealed both CD4 and CD8 cell subsets represented in the lesions. The tissue and bronchoalveolar lavage (BAL) specimens showed no organisms, but PCR methods with the BAL samples were positive for P. carinii DNA. It is hypothesized that these second respiratory episodes may have arisen as immune reconstitution syndrome in response to residual P. carinii antigen in the lung.

Adult↗
PubMed2001

Cytokine receptor common beta subunit-mediated STAT5 activation confers NF-kappa B activation in murine proB cell line Ba/F3 cells.

The cytokine receptor common beta subunit (beta(c)) transmits intracellular signals upon binding ligand such as granulocyte-macrophage colony-stimulating factor or interleukin-3 (IL-3); however, transcriptional regulation under the control of signaling events downstream of the beta(c) is not fully understood. Using murine Ba/F3 cells, here we demonstrate that the beta(c)-mediated signals stimulate NF-kappa B-driven gene expression of not only the reporter construct but also endogenous target genes such as IL-6. Analyzing the effects of several inhibitors or mutant receptors revealed that this NF-kappa B activation is mediated neither by MEK/ERK/MAPK nor by the phosphatidylinositol 3-kinase pathway but by STAT5. Overexpression experiments of the wild-type or constitutive active form of STAT5 further confirmed this notion. In addition, STAT5-dependent NF-kappa B activation is mediated not through an inducible nuclear translocation but via up-regulation of both DNA binding activity and transactivation potential of NF-kappa B. Furthermore, we also show that as yet undefined humoral factor(s) may be involved in this NF-kappa B activation process. Taken together, we may propose that cytokine receptor-mediated STAT5 activation and expression of its target genes culminates in a unique mode of NF-kappa B activation and gene expression.

Androstadienes↗