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Biomedical subjects

Toshihiko Ishida

Publications and source records attributed to Toshihiko Ishida.

At least 19 recordsLinked to original sources
PubMed2006

Platelet derived growth factor regulates ABCA1 expression in vascular smooth muscle cells.

The ATP-binding cassette transporter A1 (ABCA1) regulates lipid efflux from peripheral cells to High-density lipoprotein. The platelet-derived growth factor (PDGF) is a potent mitogen that enables vascular smooth muscle cells to participate in atherosclerosis. In this report, we showed that PDGF suppressed endogenous expression of ABCA1 in cultured vascular smooth muscle cells. Exposure of CRL-208 cells to PDGF elicited a rapid phosphorylation of a kinase downstream from PI3-K, Akt. The constitutively active form of both p110, a subunit of PI3-K, and Akt inhibited activity of the ABCA1 promoter. In conclusion, PI3-K-Akt pathways participate in PDGF-suppression of ABCA1 expression.

ATP Binding Cassette Transporter 1↗
PubMed2006

High-density lipoprotein is a potential growth factor for adrenocortical cells.

The entry of cholesterol contained within high-density lipoprotein (HDL) into adrenocortical cells is mediated by a human homologue of SR-BI, CD36, and LIMPII Analogous-1 (CLA-1) and thus augmenting their growth. To address the role of CLA-1, we created a mutant mCLA that lacked the C-terminal tail. HDL CE selective uptake by cells carrying the mCLA-1 receptor was fully active and equivalent to those transfected with full-length CLA-1 (fCLA-1). Expression of mCLA inhibited the proliferation of an adrenocortical cell line and the incorporation of [(3)H]thymidine into the cells. This effect was sensitive to wortmannin, an inhibitor of phosphoinositide 3-kinase (PI3K). Our transcriptional studies revealed that the inhibitory action of mCLA required the transcriptional factor AP-1 and the effect of HDL on AP-1 activation was also abrogated by wortmannin. These findings raise the possibility that the inhibitors of the effects of HDL may be of therapeutic value for adrenocortical tumor.

Adrenal Cortex↗
PubMed2006

Coincidental outbreak of methicillin-resistant Staphylococcus aureus in a hematopoietic stem cell transplantation unit.

BACKGROUND: Methicillin-resistant Staphylococcus aureus (MRSA) is one of the most common nosocomial pathogens among hospital-acquired infections, and immunocompromised patients are highly susceptive to infection. The molecular typing of isolated strains is a common method for tracing an outbreak of MRSA, but experience with this approach is still limited in the hematopoietic stem cell transplantation (HSCT) ward. METHODS: We experienced 6 cases of MRSA infection/colonization in our 26-bed HSCT ward during a 4-week period. This unusual outbreak strongly suggested that the same MRSA strain was involved despite strict isolation and aseptic patient care. Clarification of the transmission pattern was critical, and we applied pulsed-field gel electrophoresis (PFGE) and amplified fragment length polymorphism (AFLP) assays for evaluation. RESULTS AND CONCLUSION: In four of the six cases, the pattern of bands examined by PFGE and AFLP analyses supported the idea that direct person-to-person transmission was very unlikely and the outbreak was coincidental. This experience highlights the clinical value of molecular typing methods for the clinical epidemiological assessment of MRSA outbreak.

Adult↗
PubMed2006

Nutritional support for patients suffering from intestinal graft-versus-host disease after allogeneic hematopoietic stem cell transplantation.

BACKGROUND: Patients who exhibit gastrointestinal (GI) involvement due to graft-versus-host disease (GVHD) after allogeneic hematopoietic stem cell transplantation (SCT) are often recommended to withhold oral intake (NPO) to avoid further damage to the GI mucosa. However, it is possible that continuing oral intake could be beneficial in many patients compared to total parenteral nutrition (TPN). OBJECTIVE: The primary objective of this prospective study was to evaluate whether programmed step-ladder oral dieting (enteral nutrition; EN) is feasible and beneficial for these patients. METHODS: A total of 18 patients who exhibited GI-acute GVHD (stage I to III gut GVHD) after SCT received an EN dieting program, and changes in clinical and laboratory parameters were compared to those in a control cohort of 17 patients who were placed on NPO with TPN. Patients with GVHD were included prospectively and those with intestinal bleeding/obstruction, severe pancreatitis, and cytomegalovirus enterocolitis were excluded. RESULTS: None of the patients in the EN group experienced significant adverse events, including exacerbation of GI symptoms. Although there was no statistically significant difference in the volume or frequency of diarrhea or the time to complete dietary recovery, parameters including body weight and serum levels of total protein and albumin tended to improve faster in the EN group. CONCLUSION: The EN diet is safely applicable to patients suffering from GI involvement by GVHD.

Adult↗
PubMed2006

[Monitoring the side effects of cancer chemotherapy with patients--participation of patients in cancer therapy and sharing patient information].

The purpose of this study was to assess patient participation in cancer therapy and the sharing of patient information among the medical care team (physicians, nurses, pharmacists, and especially patients). We monitored the side effects of cancer chemotherapy with patients, and developed two support tools: One scored the points of subjective symptoms (fatigue, anorexia, nausea, etc) by patients, and the other recorded objective symptoms (clinical examination data) by pharmacists. It is most important that they attend each patient at their bedside. At this time, the trial was evaluated by questionnaire survey by inpatients receiving cancer chemotherapy (n=15). As a result, all patients (15/15) responded that this trial was necessary. This trial addressed the following: 1) increased communication between patients and medical staff concerning side effects (14/15), 2) increased interest in side effects (10/15), 3) when a patient tells medical staff about side effects, they act on it (10/15). None of the patients felt inconvenienced by scoring every day (0/15), or anxiety about side effects (0/15). Furthermore, all patients (15/15) responded that "participation of pharmacists in cancer chemotherapy" was necessary. This trial revealed no problems and suggested that patients related to the center of medical care. We should be careful in interpreting results of this small sized trial; however, the following conclusions should be reached: 1) introduction of monitoring side effects of cancer chemotherapy with patients, 2) develop communication among the medical care team.

Adverse Drug Reaction Reporting Systems↗
PubMed2005

Non-specific interstitial pneumonia; as the first clinical presentation of various collagen vascular disorders.

Recently, we have experienced significant numbers of patients diagnosed with non-specific interstitial pneumonia (NSIP) by open lung biopsy or video-assisted thoracoscopic surgery. The purpose of this work was to describe the clinical features of patients with collagen vascular disorders (CVD) presenting NSIP in the absence of systemic involvement. This study also involved a retrospective review of patients with CVD presenting clinical and pathological evidence of NSIP in the absence of systemic manifestations of CVD. We found seven patients (six from our experience and one from literature review) with histologically proven NSIP who later developed typical CVD more than 6 months after the first presentation of NSIP. In these cases, it was difficult to speculate the development of CVD at the point of first presentation. Therefore, association of CVD should be considered in patients with NSIP even in the absence of classical systemic involvement.

Adult↗
PubMed2005

Expression of interleukin-16 in allergic rhinitis.

BACKGROUND: Interleukin-16 (IL-16) has been characterized as a chemoattractant for a variety of CD4+ T cells. Several inflammatory diseases, including allergic disorders, have been reported to correlate with IL-16. We first examined the IL-16 expression of serum and mucosal tissue in patients with allergic rhinitis. METHODS: Forty-eight patients with a clinical history of house dust mite (HDM) or pollen-sensitive allergic rhinitis were included in this study. Serum IL-16 was analyzed by enzyme-linked immunosorbent assay (ELISA). IL-16 expression of nasal mucosa was detected by immunohistochemistry. RESULTS: IL-16 levels were elevated in the serum of patients with allergic rhinitis compared with normal controls. In particular, serum IL-16 levels in HDM-sensitive patients were higher than those in pollen-sensitive patients. IL-16 was significantly correlated with eosinophils in the peripheral blood of allergic rhinitis patients. Histologically, IL-16 was expressed in infiltrated lymphocytes and nasal gland cells. CONCLUSIONS: Our data indicate that one of the sources of elevated serum IL-16 in allergic patients may be gland cells and lymphocytes in allergic nasal mucosa. This IL-16 cytokine may be strongly associated with the developmental mechanism of allergic rhinitis.

Adolescent↗
PubMed2005

Cyclosporin A inhibits the early phase of NF-kappaB/RelA activation induced by CD28 costimulatory signaling to reduce the IL-2 expression in human peripheral T cells.

Cyclosporin A (CsA) inhibits interleukin (IL)-2 production, activation and proliferation of human peripheral T cells (HPTC) costimulated with simultaneous engagement of T cell receptor (TCR)/CD3 and CD28. We demonstrated that 10 ng/ml CsA, which reduced the proliferation of HPTC costimulated with anti-CD3 and anti-CD28 by half, prevented NF-AT and NF-kappaB from migrating into the nucleus. Whereas CsA added even 30 min after the costimulation caused NF-AT to remain in the cytoplasm, the delayed addition of CsA could not prevent NF-kappaB from translocating into the nucleus. CsA, which was added to HPTC simultaneously with the engagement of both CD3 and CD28 or the 1-h-delayed engagement of CD28 after prior TCR/CD3-triggering, inhibited NF-kappaB p65/RelA from binding to the target DNA fragment, followed by reduction of HPTC proliferation in response to the costimulation. When CsA was added 30 min after the delayed engagement of CD28 following the prior engagement of TCR/CD3, these inhibitory effects were diminished. Antisense NF-kappaB p65/RelA oligonucleotides inhibited p65/RelA mRNA expression, diminished IL-2 mRNA expression in the costimulated HPTC and reduced HPTC proliferation to the same extent as CsA added simultaneously with the costimulation. The CsA- or antisense p65/RelA oligonucleotide-induced reduction in the proliferation of costimulated HPTC was overcome by the addition of exogenous IL-2. These findings indicate that the major effects of CsA on the early phase of CD28-mediated costimulation in the presence of TCR/CD3 signaling are to inhibit NF-kappaB/RelA from translocating into the nucleus and binding to the target DNA sequence in the IL-2 gene promoter region, which induces IL-2 expression leading to HPTC proliferation.

CD28 Antigens↗
PubMed2005

Idiopathic non-specific interstitial pneumonia: as an "autoimmune interstitial pneumonia".

Recently, we have experienced significant number of patients diagnosed with non-specific interstitial pneumonia (NSIP) by open lung biopsy or video-assisted thoracoscopic surgery. The purpose of this study is to compare clinical and pathological features of idiopathic NSIP and NSIP associated with underlying diseases (mainly autoimmune disorders). Forty-six patients with histologically proven NSIP were retrospectively collected. Twenty-four patients had underlying diseases (12 polymyositis/dermatomyositis, 5 systemic sclerosis, 2 rheumatoid arthritis, 2 Sjogren's syndrome, 1 ulcerative colitis, 1 primary biliary cirrhosis, and 1 multiple myeloma). Twenty-two of the 46 patients had no underlying diseases. It was very difficult to distinguish idiopathic NSIP and NSIP associated with underlying diseases, clinically and radiologically. Pathologically, Lymphocytic pneumonitis was demonstrated in both groups, and it was impossible to distinguish idiopathic NSIP and NSIP associated with underlying diseases. Since generalized symptoms were not observed in patients with idiopathic NSIP, and clinical and pathological features were identical to NSIP with several autoimmune disorders, we postulate new clinical entities of "autoimmune interstitial pneumonia" in cases without underlying diseases.

Adult↗
PubMed2005

Small cell lung cancer associated with systemic sclerosis.

A 51-year-old woman developed small cell lung cancer (SCLC). She was a non-smoker and had interstitial pneumonia associated with systemic sclerosis (SSc). Sixteen additional cases obtained from the literature describing patients with SCLC associated with SSc are reviewed. The majority of patients were women with underlying interstitial pneumonia. In 3 patients who were non-smokers, interstitial pneumonia was complicated and cancer had developed in the peripheral lung field but not in the central lung field. Since SCLC is very rare in non-smokers, these findings suggest a positive association between SCLC and interstitial pneumonia associated with SSc.

Antineoplastic Combined Chemotherapy Protocols↗
PubMed2005

[A case of pulmonary actinomycosis, who expectorated sulfur granules, caused by Actinomyces odontolyticus and Actinomyces meyeri].

A 51-year-old man complaining of cough and bloody sputum, was admitted to our hospital because of antibiotic-resistant chronic pneumonia in the right upper lobe. Initially, bronchoscopic examination and sputum culture revealed no evidence of malignancy or any specific infection, either pathologically or microbiologically. However, pathological examination of a solid body expectorated with sputum revealed typical sulfur granules, indicating pulmonary actinomycosis. Two actinomyceses named Actinomyces odontolyticus and Actinomyces meyeri were detected later. Pulmonary infection caused by these types of actinomyceses is rare, and the diagnostic procedure seemed to be unusual.

Actinomycosis↗