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Biomedical subjects

T Taguchi

Publications and source records attributed to T Taguchi.

At least 1,081 records · Page 60Linked to original sources
PubMedDate not supplied

Expansion of human hepatocyte populations by a retroviral gene transfer of simian virus 40 large T antigen.

A hybrid artificial liver (HAL) could be used to treat acute liver failure or to serve as a temporary support until orthotopic liver transplantation is available. Primary human hepatocytes are ideal as a source of hepatic function in a HAL device. However, the worldwide shortage of human livers available for hepatocyte isolation severely limits this form of therapy. A possible alternative is to use a tightly regulated cell line that can be economically grown in culture to have differentiated liver function. In this work, human hepatocytes were immortalized with a retroviral vector SSR#69 expressing the genes of simian virus 40 large T antigen and herpes simplex virus-thymidine kinase. One of the resulting clones, NKNT-3 , showed the gene expression of differentiated liver function and were sensitive to the antiviral agent ganciclovir. When transplanted into the spleen of rats subjected to 90% hepatectomy, NKNT-3 cells prolonged the survival of 90% hepatectomized rats. The cells provide the advantages of unlimited availability, sterility, uniformity, and freedom from pathogens. This work represents a potential novel strategy for resolving the organ shortage that currently limits the use of primary human hepatocytes to develop a HAL.

Acute Kidney Injury↗
PubMedDate not supplied

Comparison of FDG-PET with MIBI-SPECT in the detection of breast cancer and axillary lymph node metastasis.

PURPOSE: The purpose of this work was to compare [18F]2-deoxy-2-fluoro-D-glucose (FDG) PET and 99mTc-methoxyisobutylisonitrile (MIBI) SPECT in the detection of breast cancer and axillary lymph node metastasis in the same patients. METHOD: FDG-PET and MIBI-SPECT were performed within 3 days for 40 women (age range 25-86 years old) with suspected breast cancer, in whom biopsies and/or mastectomies were performed. Both images were visually assessed, and the count ratio between tumor and normal tissue (T/N ratio) was calculated. RESULTS: Thirty-eight patients had breast cancer, and the remaining two had benign breast lesions. The sensitivities of FDG-PET and MIBI-SPECT were 78.9 and 76.3% for breast cancer and 50.0 and 37.5% for axillary lymph node metastasis, respectively. The T/N ratio of breast cancer was significantly higher in FDG-PET (6.01 +/- 3.08 mean +/- SD) than that in MIBI-SPECT (3.48 +/- 1.21) (p = 0.01). Nonmalignant diffuse uptake of FDG in the breasts and the accumulation of MIBI in heart and liver occasionally obscured tumor uptake. CONCLUSION: These results indicate that MIBI-SPECT is comparable with FDG-PET in detecting breast cancer. Neither FDG-PET nor MIBI-SPECT is sufficiently sensitive to rule out axillary lymph node metastasis.

Adult↗
PubMedDate not supplied

Vagal paraganglioma. A case report.

Vagal paragangliomas are rare tumors and difficult to differentiate from carotid body tumors or schwannomas of the vagus nerve. We present a patient who could be preoperatively diagnosed as having a vagal paraganglioma by ultrasonography and color Doppler sonography.

Cerebral Angiography↗
PubMedDate not supplied

Outcome of fetal cystic hygroma and experience of intrauterine treatment.

OBJECTIVE: To review our cases of fetal cystic hygroma and to examine the prognostic factors with the goal of establishing criteria for the intrauterine treatment for cystic hygroma. PATIENTS AND METHODS: Thirty-one cases of fetal cystic hygroma were managed by us from January 1988 to December 1997, and 21 cases were available for analysis. Three prognostic factors, namely chromosomal abnormality, structural anomaly and hydrops fetalis, were evaluated. We treated 2 cases of cystic hygroma associated with hydrops fetalis in utero using OK-432 injection under ultrasound guidance. RESULTS: The fetuses without any of the prognostic factors listed above showed a good prognosis throughout the fetal and neonatal periods. However, in this group, 2 infants with large tumors died of hemorrhage from the tumor at 6 months and 3 years of age, respectively. Cases with hydrops fetalis without chromosomal abnormalities or structural anomalies (5 cases) resulted in either intrauterine fetal death (IUFD, 2 cases) or early perinatal neonatal death (early PND, 3 cases). The cause of early PND was circulatory failure. Most of the hydrops cases with either a chromosomal abnormality or structural anomaly resulted in IUFD before 22 weeks of gestation. The size of the cyst decreased in 1 of 2 cases treated in utero. CONCLUSIONS: The fetal cases of cystic hygroma showing hydrops fetalis without chromosomal abnormalities or structural anomalies are considered to be possible candidates for intrauterine therapy. Those with very large cystic hygroma without any of the three prognostic factors are also thought to be candidates for fetal treatment. Based on our clinical experience, sclerotherapy using OK-432 is considered to be a treatment option in selected cases with fetal cystic hygroma.

Chromosome Aberrations↗
PubMedDate not supplied

In utero evaluation and the long-term prognosis of living infants with cystic hygroma.

OBJECTIVE: The aim is to evaluate the natural course and the long-term prognosis of cystic hygroma following live birth. METHODS: Of 39 cases, 12 were excluded because of either artificial termination or intrauterine treatment. 27 cases were retrospectively classified into 2 groups based on the outcome, and the clinical profiles were compared. The long-term prognosis was analyzed for live births. RESULTS: 5 (18.5%) and 22 (81.5%) cases resulted in live birth and fetal demise, respectively. Both the frequency of hydrops fetalis and the maximum size of the cyst were more significantly associated with a poor prognosis (p < 0.01). Of 5 live births, 3 cases with chromosomal or structural abnormalities were handicapped. CONCLUSIONS: Hydrops fetalis and cyst size are poor prognostic factors, and fetal chromosome and structural malformations should be taken into account when predicting the long-term prognosis.

Chromosome Aberrations↗
PubMedDate not supplied

Antenatal diagnosis and surgical management of congenital cystic adenomatoid malformation of the lung.

We experienced 12 cases of congenital cystic adenomatoid malformation of the lung (CCAM) including 6 cases diagnosed antenatally. They were classified into three groups according to the clinical manifestations. Group A was associated with hydrops fetalis (n = 3), group B presented with respiratory distress symptoms after birth (n = 6), and group C showed no respiratory symptoms (n = 3). All cases of group A were lost because of hydrops and respiratory failure due to pulmonary hypoplasia. Because a compression of the mass is thought to be a cause of hydrops, this group is considered to be a good indication for fetal treatment. All cases of group B showed progressive respiratory symptoms a few days after birth which were successfully treated surgically. In 2 of 3 cases of group C, the lesions decreased in size both antenatally and postnatally. We conclude that serial sonographic evaluations for fetal CCAM are important. If the fetus develops hydrops, fetal surgery is to be considered. If not, however, fetal surgery should not be done, because some lesions can shrink in size, or even disappear, while others can be treated successfully after birth by lobectomy or even segmentectomy.

Cystic Adenomatoid Malformation of Lung, Congenita↗
PubMedDate not supplied

Manganese intoxication during intermittent parenteral nutrition: report of two cases.

BACKGROUND AND METHODS: The administration of trace elements is thought to be needed in patients receiving long-term parenteral nutrition. Recently, manganese intoxication or deposition was documented in such patients. We report two cases of manganese intoxication during intermittent parenteral nutrition including manganese. Manganese had been administered for 4 years at a frequency of one or two times per week in one case and for 5 years at a frequency of one or two times per month in the other case. Both cases showed mild symptoms with headache and dizziness. One case had mild hepatic dysfunction and the other did not. The whole-blood manganese level increased in one case, but not in the other case. T1-weighted magnetic resonance images revealed symmetrical high-intensity areas in basal ganglia and thalamus in both cases. After the administration of manganese was stopped, these symptoms all disappeared and the magnetic resonance images abnormalities gradually improved in both patients. Mild long-term manganese intoxication is thus considered to occur regardless of the frequency of using a manganese supplement. CONCLUSIONS: Patients should be carefully monitored when receiving long-term parenteral nutrition including manganese, even when the manganese dose is small and the frequency of receiving a manganese supplement is low.

Adolescent↗
PubMedDate not supplied

Effects of the protein-bound polysaccharide preparation, PSK on spontaneous breast cancer in mice.

The protein-bound polysaccharide preparation, PSK was tested for its ability to suppress carcinogenesis in spontaneous tumours in C3H/OuJ mice. They were divided into two groups of 40 individuals each. A normal diet was given to one group, establishing a control population, while the other group had 2% PSK added to their feed. Amount of feed consumed, body weight and tumour size were recorded weekly for 1 year. Within 15 weeks, 90% of the control population had developed tumours. In the test group the incidence of cancer and the number of tumours was significantly suppressed, and survival rates were improved. The amount of feed consumed and body weights of control and test groups were about the same.

Administration, Oral↗
PubMedDate not supplied

Suppression of mesangial-cell proliferation by trapidil in glomerulonephritis induced by anti-thymocyte serum in rats.

Trapadil (Mochida Pharmaceuticals, Japan), an antiplatelet drug, suppresses the growth of several cell types and is thought to antagonize platelet-derived growth factor. The effects of trapidil on mesangial-cell proliferation in glomerulonephritis induced by anti-thymocyte serum in Wistar rats were investigated. Control rats were treated with phosphate-buffered saline (group I); group II rats were injected with a single dose of anti-thymocyte serum (8 ml/kg body weight), and group III rats were treated with both a single dose of anti-thymocyte serum (8 ml/kg body weight) and with trapidil (5 mg/kg body weight/day). Three rats in each group were killed on day 3, and the other three on day 10. Control rats showed no significant histological changes on day 3 or day 10. In group II, on day 3, there was a marked decrease in glomerular cell numbers, with mesangiolysis. Histologically severe mesangial-cell proliferation with expansion of mesangial areas was noted on day 10. None of the rats in group III showed mesangial alterations, histologically, indicating that mesangial-cell proliferation was suppressed by trapidil. This suppression may result from antagonism of the binding of platelet-derived growth factor to the specific surface receptors in the mesangial cells. Trapidil may have clinical value in the treatment of mesangial-cell proliferative glomerular diseases.

Animals↗
PubMedDate not supplied

Immunohistochemical analysis of type III and IV collagens in tubulointerstitial damage in human benign nephrosclerosis.

Prolonged hypertension causes structural changes including glomerulosclerosis and tubulointerstitial damage of the kidney, termed benign nephrosclerosis. It is generally accepted that, in benign nephrosclerosis, increased accumulation of extracellular matrix in the glomeruli results in glomerulosclerosis. Little is known, however, about the possible role of the extracellular matrix in the tubulointerstitial damage in benign nephrosclerosis. In this study, the possible roles of type IV basement-membrane collagen and type III interstitial collagen in tubulointerstitial damage caused by hypertension were explored. Immunohistochemical techniques were used to investigate the distribution of type III and type IV collagens in the kidney sections of 15 patients with benign nephrosclerosis with tubulointerstitial damage and in 10 controls. In the control renal sections strong immunostaining for type III collagen was found in the interstitium and immunostaining for type IV collagen was present in the tubular basement membrane and weakly in the interstitium. In the patients with tubulointerstitial damage there was increased immunostaining for both type III and type IV collagens in the expanded interstitium and damaged tubules than was found in the control kidney sections. These findings indicate that increased accumulation of both type III and type IV collagens might play a significant role in the tubulointerstitial damage in benign nephrosclerosis.

Atrophy↗
PubMedDate not supplied

Significance of increased accumulation of type VI collagen and transforming growth factor beta 1 in tubulointerstitial damage in hypertensive nephrosclerosis: an immunohistochemical study.

The distribution of type VI collagen and transforming growth factor beta 1 (TGF beta 1) was studied by immunohistochemistry in 12 renal biopsy specimens of hypertensive nephrosclerosis and five control cases. In control kidneys, the immunostaining of type VI collagen was found in the mesangium, glomerular basement membrane and tubular basement membrane. For TGF beta 1, mesangium, glomerular basement membrane, tubular basement membrane and tubular epithelial cells stained positively in the control kidneys. In contrast to the control cases, markedly increased immunostaining for both type VI collagen and TGF beta 1 was consistently observed in tubulointerstitial damage in hypertensive nephrosclerosis. These immunohistochemical findings provide the evidence for a parallel increase of both type VI collagen and TGF beta 1 during the process of tubulointerstitial injury in hypertensive nephrosclerosis. From the results of the present study, it is speculated that TGF beta 1 may contribute to the tubulointerstitial injury by stimulating increased synthesis of various extracellular matrix including type VI collagen.

Adult↗
PubMedDate not supplied

Clinical evaluation of Ramosetron injections in the treatment of cisplatin-induced nausea and vomiting.

A phase III, double-blind, placebo-controlled study was performed to examine the safety and efficacy of ramosetron in cancer patients with cisplatin-induced nausea/vomiting. Patients were divided into two groups: group R received 0.3 mg ramosetron intravenously and group P received placebo. Eighty-eight patients were enrolled, 44 in each group; 84 (43 in group R, 41 in group P) were included in the clinical efficacy analysis and 86 (44 in group R, 42 in group P) in the safety analysis. Ramosetron was significantly more clinically effective than placebo against nausea, vomiting and anorexia; 65.1% of patients in group R experienced no vomiting in the first 6 h of observation compared with 7.3% of those receiving placebo. No serious adverse reactions or significant differences in safety were observed between the groups. Based on these results, ramosetron injection is effective in the treatment of cisplatin-induced nausea/vomiting and its clinical usefulness is demonstrated here.

Adult↗
PubMedDate not supplied

Intrapericardial instillation of OK-432 for the management of malignant pericardial effusion: report of three cases.

Three patients with cardiac tamponade caused by malignancy were treated by pericardiocentesis with intrapericardial OK-432 instillation. The underlying disease was adenocarcinoma of unknown origin, breast cancer and multiple myeloma. Under electrocardiographic monitoring, a polyethylene catheter with several side holes was inserted into the pericardial sac, and after a maximal volume of fluid was withdrawn, 5 KE of OK-432 diluted in 20 ml of saline was instilled through the catheter. All the patients who received intrapericardial OK-432 therapy obtained complete control of pericardial effusion for more than 30 days. The side effects were fever, chills and chest pain which were easily controlled by antipyretics.

Adenocarcinoma↗
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Ultrastructural changes of glomerular basement membrane in IgA nephritis: relationship to hematuria.

Ultrastructural changes in the glomerular basement membrane (GBM) of 415 samples from 344 patients with IgA nephritis, were examined for potential relationship to hematuria. The GBM showed various alteration: splitting, thinning, membranolysis with swelling of the lamina rara externa and interna, forming of small projections, and rupture. These lesions were present in 48% of IgA nephritis and in 16% of the controls. In the IgA nephritis group, the patients with hemispherical mesangial dense deposits had the highest rate (60%) of capillary wall abnormalities. Such lesions were more frequent in patients biopsied during severe hematuria (80%) than in those biopsied without hematuria (33%), (p less than 0.01). It is assumed that the ultrastructural abnormalities of GBM may contribute to the clinical evidence of severe hematuria.

Adolescent↗
PubMedDate not supplied

Nephropathy of nail-patella syndrome.

Ultrastructural renal lesions of a sporadic case of nail-patella syndrome are described. Although the patient, an 8-year-old Japanese boy, had no clinical renal syndrome, electron microscopy disclosed the presence of collagen fibrils and electron lucent areas within glomerular basement membrane. Comparative observation of glomeruli in sections stained by uranyl-acetate and lead-citrate and those by PTAH-uranyl revealed evidence of many collagen fibrils in mesangial matrix, as well as glomerular basement membrane. At the follow-up study 3 years after the biopsy, he still showed normal urinalysis and no renal dysfunction. Characteristic ultrastructure of glomerulus of this disease can be present even in cases without any apparent clinical renal involvement. It is concluded that the glomerular lesions in nail-patella syndrome may be caused by abnormal metabolic processes of collagen in glomeruli rather than entrapment of circulating collagen precursors.

Basement Membrane↗
PubMedDate not supplied

Mucosal homeostasis: role of interleukins, isotype-specific factors and contrasuppression in the IgA response.

Oral ingestion of antigen elicits immune responses at mucosal sites where humoral immunity is largely due to antibodies of the IgA isotype. This is often accompanied by suppression of systemic responses to the same antigen, a state termed oral tolerance. This IgA response is regulated by interactions between T cell subsets found at IgA inductive tissues, i.e., the gut-associated lymphoreticular tissue (GALT) or Peyer's patches (PP). PP T helper (Th) cells support IgA responses, and interleukins 5 (IL-5) and IL-6 can augment secretion of this isotype. Subsets of Th cells may also express Fc receptors for IgA (Fc alpha R) and secrete Fc alpha R as an IgA-binding factor (IBF alpha). Membrane-derived Fc alpha R is a glycoprotein of 38,000 M.W. and this molecule induces selective increases in IgA secreting cells (as determined by the ELISPOT assay) in PP B cell cultures. Fc alpha R+ T cell lines have been shown to secrete IBF alpha as well as IL-5 both of which promote IgA synthesis. Recombinant IL-5 (rIL-5) and rIL-6 induce IgA synthesis mainly by PP B cell blasts, and principally act on surface IgA-positive (sIgA+) B cells for these responses. Another form of mucosal regulation is provided by T contrasuppressor (Tcs) cells, which abrogate oral tolerance when adoptively transferred to mice and restore systemic responsiveness to the antigen sheep erythrocyte (SRBC). Tcs cells from mice systemically primed with SRBC support IgM and IgG subclass responses, while Tcs cells from orally primed mice support IgM, IgG subclass and IgA anti-SRBC responses. These Tcs cells are CD3+, CD4-, 8- and are antigen-specific. These regulatory cells may use the gamma-delta (gamma-delta) form of T cell receptor for antigen recognition.

Animals↗
PubMedDate not supplied

Apoptosis as a mechanism of lectin-dependent monocyte-mediated cytotoxicity.

In this study we investigated the mechanisms of cytotoxicity mediated by pokeweed mitogen (PWM)-activated human peripheral blood monocytes. By using DNA electrophoresis and propidium iodide (PI)-DNA staining flow cytometry, we demonstrated that apoptotic cell death of target U937 cells and Raji cells was induced in lectin (PWM)-dependent monocyte-mediated cytotoxicity (LDMC). The LDMC-mediated DNA fragmentation in U937 cells and Raji cells was induced in lectin (PWM)-dependent monocyte mediated cytotoxicity(LDMC). The LDMC-mediated DNA fragmentation in U937 cells was completely inhibited by anti-TNF alpha monoclonal antibody (mAb), but not by the addition of monosaccharide (N-acetylglucosamine, GlcNAc, a sugar specifically recognized by PWM and a lectin-like receptor on monocytes). In contrast, GlcNAc inhibited the DNA fragmentation in Raji cells induced by LDMC which the anti-TNF alpha mAb had no effect. PWM was found to stimulate the production of nitric oxide (NO) from monocytes. The NO-production was enhanced in the presence of target Raji cells, while the enhancement was abolished by the treatment with GlcNAc. By flow cytometry, we found that PWM bound to tumour cells as well as monocytes, and inhibited the expression of HLA-DR antigen on tumour cells. These results suggest that the presence of lectin molecules on the surface of monocytes and tumour cells may bring the two cells together, thus facilitating the induction of apoptosis in target cells by triggering the production of cytolytic factors (TNF and NO) and the modification of target cell surface antigen (HLA-DR).

Acetylglucosamine↗