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Biomedical subjects

T Nishida

Publications and source records attributed to T Nishida.

At least 271 records · Page 15Linked to original sources
PubMed1997

Differentiated thyroid carcinoma with airway invasion: indication for tracheal resection based on the extent of cancer invasion.

OBJECTIVE: Although aggressive approaches to locally invasive differentiated thyroid carcinoma are reported to improve the prognosis, few investigations have provided an indication for airway resection. The present study was undertaken to determine the best indication for airway resection for differentiated thyroid carcinoma invading the trachea. METHODS: One hundred seventeen patients with differentiated thyroid carcinoma invading surrounding structures were retrospectively studied for local failures and prognosis and were divided into five groups mainly on the basis of macroscopic findings: Group 1 consisted of 40 patients who underwent tracheal resection for deep tracheal invasion; group 2 consisted of 14 patients with deep tracheal invasion and no airway resection; group 3 consisted of 13 patients with superficial tracheal invasion and no airway resection; group 4 comprised 48 patients with extrathyroidal invasion other than laryngotracheal structures; and group 5 consisted of two patients who underwent tracheal resection for superficial invasion. RESULTS: Resectional management of the airway for patients with deep tracheal invasion decreased local recurrence and improved postoperative prognosis compared with nonresectional management for the tumor, or shaving off tumor from the trachea for patients with superficial invasion, did not increase postoperative local failures or mortality (group 3 vs groups 4, 5, and 1). CONCLUSION: These results implied that differentiated thyroid carcinomas with superficially limited invasion could be treated successfully by nonresectional management of the trachea and that those with deep invasion should be treated by resection of the invaded trachea.

Aged↗
PubMed1997

A pregnant woman with clear cell adenocarcinoma of the ovary arising from endometriosis and with benign and borderline adenofibroma of the clear cell and endometrioid types.

We encountered a case of ovarian cancer in a 33-year-old, 8-week pregnant woman. Histological examination revealed both a transitive form of ovarian endometriosis with marked decidual changes due to pregnancy and clear cell carcinoma. Benign and borderline clear cell adenofibroma and benign and borderline endometrioid adenofibroma were also found. Parts of these adenofibromas showed transformation to clear cell carcinoma. This case suggests that clear cell carcinoma can arise from clear cell adenofibromas and/or ovarian endometriosis, even in young patients.

Adenocarcinoma, Clear Cell↗
PubMed1997

Unrelated bone marrow transplantation from the National Marrow Donor Program.

Between November 1992 and December 1996, we carried out bone marrow transplantation through the National Marrow Donor Program (NMDP) for 11 patients who lacked an appropriate donor among their family members and the Japan Marrow Donor Program (JMDP). They accounted for 11% of 101 patients who had registrated to the NMDP Transplant Center Office in Japan. The median time required from the initiation of preliminary search to transplant for these 11 patients was 198 days. The 11 donors included four Caucasians, one Native American and the others were Asian/Pacific islanders. A median of 17 h was required to transport bone marrow from harvest institutes to our hospital and their viability determined in our laboratory had a median of 96%. Engraftment was observed in all recipients and the incidence of grade III-IV acute graft-versus host disease was 27%. Of four patients three (75%) with chronic myelogenous leukemia in chronic phase (standard-risk) and two (29%) of seven patients in progressive state of the disease (high-risk), are alive at present. Cooperation between the JMDP and the NMDP, which began in April 1997, could shorten the time for donor search and allow transplantation to more patients with more appropriate timing.

Adolescent↗
PubMed1997

Synthetic study of phosphopeptides related to heat shock protein HSP27.

Two kinds of phosphoserine-containing peptides related to HSP27 were synthesized by the Boc- or Fmoc-mode solid-phase method based on prephosphorylation strategy. In the case of the Boc strategy, the O-phosphono group of the phosphoserine residue was protected with the cyclopentyl or cyclohexyl group. On the other hand, N'-Fmoc-O-[(benzyloxy)-hydroxyphosphinyl]serine was employed in case of the Fmoc strategy. Consequently, it has become-feasible to utilize conventional solid-phase methods for synthesizing any phosphopeptides which are required to elucidate biochemical significance of protein phosphorylation.

Chromatography, High Pressure Liquid↗
PubMed1997

Pulmonary hemosiderosis with hypersensitivity to buckwheat.

BACKGROUND: Adverse reactions after ingesting buckwheat are known to be IgE-mediated. Further, hypersensitivity reactions may be involved in some patients with pulmonary hemosiderosis related to cow milk sensitivity. We, however, encountered a patient with pulmonary hemosiderosis related to buckwheat protein without high levels of buckwheat-specific IgE antibodies. OBJECTIVE: The aim of this study was to investigate the mechanisms. METHODS: RAST for anti-buckwheat IgE, skin prick test, skin patch test, and proliferative responses of peripheral blood mononuclear cells to buckwheat were investigated in this patient. RESULTS: RAST values for buckwheat protein were negative, and skin prick test for buckwheat protein also gave negative results. On the other hand, skin patch testing for buckwheat protein elicited positive responses. Further, peripheral blood mononuclear cells of our patient responded to buckwheat protein. CONCLUSIONS: Our patient had pulmonary hemosiderosis related to non-immediate buckwheat protein hypersensitivity.

Cells, Cultured↗
PubMed1997

The NK1 receptor and its participation in the synergistic enhancement of corneal epithelial migration by substance P and insulin-like growth factor-1.

1. We have previously shown that substance P (SP) and insulin-like growth factor-1 (IGF-1) act synergistically to enhance the migration of rabbit corneal epithelial cells in an organ culture model. The present study was designed to identify the epithelial cell SP receptor that participates in this synergistic effect. 2. Rabbit corneal blocks were incubated for 24 h, then the length of the path of epithelial migration was measured. Reagents tried in the TC-199 culture medium, in the presence or absence of IGF-1, were: SP, agonists of tachykinin receptors NK1, NK2 or NK3 and antagonists of tachykinin receptors NK1 or NK2. 3. The binding characteristics of SP receptors were examined in rabbit cultured corneal epithelial cells by binding assays with [125I]-SP in the presence or absence of excess unlabelled SP or ligands of NK1, NK2 or NK3 receptors. 4. As was demonstrated previously, SP and IGF-1 stimulated epithelial migration when they were added to the culture medium together, but individually they had no effect. NK1 agonists had the same synergistic effect with IGF-1 as did SP, but the NK2 and NK3 agonists did not. Furthermore, the NK1 antagonist abolished the synergistic effect of SP and IGF-1, but the NK2 antagonist had no effect. 5. SP bound specifically to rabbit cultured corneal epithelial cells. The binding affinity was 0.44 nM and there were 2.43 x 10(4) binding sites per cell. The NK1 ligand competed, in a dose-dependent fashion, with the binding of SP to corneal epithelial cells, but neither the NK2 nor NK3 ligand affected binding. 6. We conclude that the SP receptor in rabbit corneal epithelial cells is NK1 and that this receptor participates in the synergistic enhancement of corneal epithelial migration by SP and IGF-1. The precise mechanism(s) of this interaction requires more study. These findings imply that both neural and humoral factors are essential for the maintenance and healing of corneal epithelium.

Animals↗
PubMed1997

Hepatic injury localized to the field of total lymphoid irradiation.

A 37-year-old woman with severe aplastic anemia underwent allogeneic bone marrow transplantation following cyclophosphamide (CY) and total lymphoid irradiation (TLI). On day +30, a CT scan was carried out because of a mild elevation in liver enzymes, and it revealed a low density area with a sharp border in the left lobe corresponding to the irradiated area. MRI showed a hypersignal intensity on both T1 and T2-weighted images and suggested that hepatic damage was mainly severe fatty change. These abnormalities resolved with no treatment. CY with TLI for adult patients with severe aplastic anemia may induce hepatic injury.

Adult↗
PubMed1997

Combined effects of substance P and insulin-like growth factor-1 on corneal epithelial wound closure of rabbit in vivo.

PURPOSE: We investigated the combined effects of substance P (SP) and insulin-like growth factor-1 (IGF-1) on corneal epithelial wound closure in vivo. METHODS: The corneal epithelium of 16 rabbits was debrided by n-heptyl alcohol treatment; SP (1 mg/ml) and/or IGF-1 (1 microgram/ml) in phosphate-buffered saline (PBS) were administered immediately and at 2, 4, 6, 8, 10, 24, 26, 28, 30, 32, and 34 hours after debridement. Controls received PBS alone. The eyes were stained with fluorescein and photographed at baseline and at 6, 12, 18, 24, 30, 36, and 48 hours after debridement. The wound radii of the epithelial defects were recorded from hour 12 to hour 30, and the rate of healing was calculated by linear regression analysis. RESULTS: The mean (+/-SD) healing rate in the control group was 57.03 +/- 7.88 microns/h. The administration of SP or IGF-1 alone did not affect the healing rates, which were 55.49 +/- 2.49 and 55.57 +/- 7.14 microns/hr, respectively. However, when SP and IGF-1 were combined, the mean healing rate was significantly higher (75.16 +/- 6.68 microns/hr) than that of the control, SP-treated, or IGF-1-treated groups (p < 0.05). CONCLUSIONS: These results demonstrated that SP and IGF-1 synergistically affect corneal epithelial wound closure.

Animals↗
PubMed1997

Preservation of recurrent laryngeal nerve invaded by differentiated thyroid cancer.

OBJECTIVE: This study was undertaken to determine whether the recurrent laryngeal nerve involved in differentiated thyroid carcinoma could be preserved. SUMMARY BACKGROUND DATA: Few investigations have provided definitive results concerning preservation of the recurrent laryngeal nerve involved in thyroid cancer. Complete excision with resection of the recurrent laryngeal nerve reportedly did not improve survival over incomplete excision in differentiated thyroid carcinoma. METHODS: A retrospective study was performed with the medical records of 50 patients with differentiated carcinoma and preoperative normal vocal cord function to investigate outcomes of recurrent laryngeal nerve preservation including local recurrence, prognosis, and postoperative vocal cord function. The recurrent laryngeal nerves on 1 or both sides were preserved in 23 patients (the preserved group), whereas the involved recurrent laryngeal nerve of the other 27 patients was resected (the resected group). RESULTS: Backgrounds of patients were similar between the resected and preserved groups. The number of patients with recurrences in each group was similar, and incidence of local, regional, and distant metastatic recurrences were not different between the groups. Postoperative overall survival of the preserved group was similar to that of the resected group (p = 0.1208). More than 60% of patients or of nerve at risk in the preserved group restored normal vocal cord function within 6 months. Some functional vocal cord movement was recognized in 80% of patients or of nerve at risk. All patients in the resected group including patients with nerve anastomosis showed permanent paralysis of the ipsilateral vocal cord. CONCLUSIONS: These results suggested that the recurrent laryngeal nerve, even if infiltrated by differentiated thyroid cancer, is worthwhile to preserve for maintenance of postoperative vocal cord function without affecting the incidence of local recurrence or prognosis.

Adenocarcinoma, Follicular↗
PubMed1997

A human gall-bladder signet ring cell carcinoma cell line.

To date, very few reports of the establishment of gall-bladder cancer cell lines have appeared, although many cancer cell lines of various kinds have been established. On the other hand, no reports could be found on signet ring cell carcinoma cell lines derived from the gall-bladder and only five cell lines from the stomach. A human gall-bladder cancer cell line (FU-GBC-2) was established in tissue culture from the ascitic fluid of a 69-year-old Japanese female patient. The tumor cells growing in tissue culture exhibited the morphological characteristics of signet ring cells in phase contrast and electron microscopy. The population doubling time was 43 hours. Heterotransplantation was succeeded by inoculation into the dermis of BALB/c nude mice. An immunocytochemical study showed that most of the cultured cells were positive for carcinoembryonic antigen, CA19-9 and epithelial membrane antigen, but negative for vimentin. The modal chromosome number was 120 with a range of 100-124. Flow cytometry showed an aneuploidy pattern in the cultured cells at passage 30. Markedly amplified c-myc oncogene was observed by Southern blot analysis. This cell line may be useful in the study of the morphological and biological characteristics of signet ring cell carcinoma and gall-bladder adenocarcinoma.

Aged↗
PubMed1997

Cerebral infarction in incontinentia pigmenti: the first report of a case evaluated by single photon emission computed tomography.

A 2-month-old girl with incontinentia pigmenti presented with acute-onset right-handed focalized seizures and subsequent seizure generalization. Computed tomography, magnetic resonance imaging and single photon emission computed tomography results indicated that she had multiple cerebral infarctions. These findings suggest that incontinentia pigmenti should be included among the neurocutaneous syndromes associated with ischemic strokes in childhood. This is the first report of a case with incontinentia pigmenti associated with cerebral infarction evaluated by single photon emission computed tomography.

Brain↗
PubMed1997

Nylon biodegradation by lignin-degrading fungi.

The biodegradation of nylon by lignin-degrading fungi was investigated. The fungus IZU-154 significantly degraded nylon-66 membrane under ligninolytic conditions. Nuclear magnetic resonance analysis showed that four end groups, CHO, NHCHO, CH3, and CONH2, were formed in the biodegraded nylon-66 membranes, suggesting that nylon-66 was degraded oxidatively.

Basidiomycota↗
PubMed1997

Establishment of a standardized assay system of fibronectin activity using fibronectin-mediated cell adhesion.

An in vitro assay of fibronectin (FN) was established based on the adhesion of baby hamster kidney (BHK) cells through the cell-binding domain of FN. Each well of a microtiter plate was coated with samples or various concentrations of standard FN. Bovine serum albumin was further coated to prevent the non-specific adhesion of the cells. Various numbers of BHK cells were plated and incubated. After washing out the non-attached cells, the number of attached cells was measured using neutral red (NR)-staining. The conditions for the assay were optimal when 1 x 10(5) cells/well were plated and incubated for 90 min. The linear relationship between the concentration of FN coated and the absorbance of NR was observed in the range of 0.1-1.0 micro/ml of FN. The inhibition of cell binding by the peptides containing an Arg-Gly-Asp (RGD) sequence demonstrated that this assay system depended on FN-mediated cell adhesion through the major cell-binding domain.

Animals↗
PubMed1997

Distribution of desmin and fibronectin in chick embryo gonad during testicular cord formation.

The distribution of desmin and fibronectin in the chick embryo gonad in and after sexual differentiation was investigated immunohistochemically. In the undifferentiated gonad (stage 27), fibronectin was detected in the dorsal mesentery, basement membrane and part of the parenchyma, while desmin was not recognized. After sexual differentiation (stages 31 to 34), desmin-positive cells gradually increased in number with the progress of development. They were obviously seen in developing interstitial regions between testicular cords. However, fibronectin was hardly observed at the same stages. At stage 37, desmin-positive cells were present only in a part of the Leydig cells and myoid cells, while fibronectin was discontinuous in the basement membrane surrounding testicular cords. In addition, the expressions of desmin and fibronectin were simultaneously and adjacently recognized. These results suggest that myoid cells may produce fibronectin protein and that fibronectin mainly contributes to the formation of testicular cord basement membrane in chick embryos. Thus, the cell-to-cell and cell-to-matrix interactions may be important in testicular morphogenesis of chick embryos.

Animals↗
PubMed1997

The effect of oxidizing water on metallic restorations in the mouth: in vitro reduction behavior of oxidizing water.

Mouth-rinsing with oxydized water which contains electrolytically generated chlorine is known to hinder dental plaque formation and growth, but it also accelerates the deterioration of metallic restorations in the mouth. The present work consists of an in vitro study to elucidate the electrochemical reactions involved in the reduction of oxydized water on dental alloys through a systematic investigation of the potentiostatic polarization behavior of dental alloy electrodes. The five dental alloys selected for investigation were gold alloy, gold alloy containing platinum, silver-palladium-gold alloy, conventional amalgam and high copper amalgam. The corrosion potentials of all dental alloy electrodes were shown to be more noble in oxydized water than in 0.1N sodium chloride solution. The potential differences between the corrosion potentials were relatively small in the case of amalgam electrodes. The polarization curves for all of the dental alloy electrodes in oxydized water revealed reduction currents of chlorine, hypochlorous acid, dissolved oxygen and oxonium ion. The reduction of chlorine and hypochlorous acid started at a more noble potential than that of dissolved oxygen. The dental alloys studied, except the amalgams, did not dissolve excessively at the corrosion potentials in oxydized water.

Chlorine↗
PubMed1997

Optimal timing of a second-look operation for advanced epithelial ovarian cancer.

To clarify the optimal timing of second look operation (SLO) for advanced ovarian cancer, we retrospectively reviewed the records of 53 patients with FIGO stage 2, 3 and 4 epithelial ovarian cancer. SLOs were performed more than 12 months after primary surgery in 35 patients (late SLOs), and immediately after first-line chemotherapy in 18 patients (early SLOs). We examined data on SLO findings and patients' clinical courses. SLO findings were positive 5 (27.7%) of 18 in the early SLO group and in 11 (31.4%) of 35 in late SLO group. Positive findings were detected by washing cytology in 3 (60%) of the 5 in the early SLO group compared with 2 (18.2%) of the 11 in the late SLO group. Patients with microscopic disease had better prognosis than patients with macro lesions. False-negative SLO findings were 30.8% in the early SLO group and 12.5% in the late SLO group. All patients who recurred after negative SLOs had grade 2 and 3 tumors. The benefits of SLO were limited to accurate evaluation of first-line chemotherapy and early detection of persistent disease. In these implications, early performance of SLO is recommended.

Adult↗