PubMed Health⌕ Search

Biomedical subjects

S Shinagawa

Publications and source records attributed to S Shinagawa.

At least 19 recordsLinked to original sources
PubMed1999

Comparison of bronchoalveolar lavage cell findings in complete-resolution pneumonia and delayed-resolution pneumonia.

BACKGROUND: In some patients with bacterial pneumonia, the resolution of chest radiograph shadows are delayed. There have been many clinical and pathological studies on delayed-resolution pneumonia (DR). However, there are no reports concerning inflammatory cell findings of bronchoalveolar lavage (BAL) fluid in patients with DR. We compared the BAL fluid cell findings in patients with DR with those in patients with complete-resolution pneumonia (CR). METHODS: The subjects included six patients whose chest radiograph shadows were completely resolved within 2 weeks after an appropriate antibiotic administration (CR), and nine patients whose chest radiograph shadows were unresolved more than 2 weeks after the treatment (DR). BAL was done 2-3 weeks after the antibiotic treatment in both groups. We compared differential counts and lymphocyte subsets in BAL fluid among patients with CR, patients with DR, and asymptomatic subjects. RESULTS: There were no significant differences in BAL fluid cell findings between CR groups and asymptomatic groups. On the other hand, the percentages of lymphocytes, neutrophils and eosinophils in DR group were significantly increased compared with those in CR and normal groups. There was no significant difference in the CD4+/CD8+ ratio of BAL lymphocytes among the three groups. CONCLUSIONS: It is suggested that infiltration of inflammatory cells in the lung exists in DR, despite the disappearance of inflammatory reaction in the peripheral blood.

Adult↗
PubMed1998

Bronchoalveolar lavage cell findings in three types of eosinophilic pneumonia: acute, chronic and drug-induced eosinophilic pneumonia.

There are clinically different types of eosinophilic pneumonia (EP) but no study to date has compared pulmonary inflammatory cells between different types of EP, such as acute eosinophilic pneumonia (AEP), chronic eosinophilic pneumonia (CEP) and drug-induced eosinophilic pneumonia (drug-EP). The present study compared bronchoalveolar lavage fluid (BALF) cell findings to elucidate whether the profiles of the pulmonary inflammatory cells were different among the three types of EP. Clinical records of 28 patients with EP, consisting of eight AEP patients, 10 CEP patients and 10 drug-EP patients, were examined retrospectively. The differential cell counts, the CD4+/CD8+ ratio of lymphocytes, the percentage of HLA-DR+ in CD4+ and CD8+ lymphocytes, and the mean number of nuclear segmentations in cosinophils in BALF were compared among the three types of EP. The numbers of total cells, lymphocytes, neutrophils and eosinophils in BALF from patients with AEP were increased compared with those from normal subjects, and patients with CEP and drug-EP. The CD4+/CD8+ ratio of the BALF lymphocytes in patients with AEP, which exceeded 1.0 in all patients, was significantly higher than that in normal subjects. The percentages of HLA-DR+ cells in CD8+ lymphocytes in BALF from patients with CEP were significantly higher than those from patients with AEP and drug-EP. There was no significant difference in the mean number of nuclear segmentations in eosinophils in BALF among the three types of EP. The BALF cell findings in patients with EP showed some characteristics in accordance with type of EP. It is suggested that pulmonary neutrophils and lymphocytes, rather than eosinophils, may be related to the pathogenesis of the different types of EP.

Acute Disease↗
PubMed1998

Subsidence of seizure induced by stereotactic radiation in a patient with hypothalamic hamartoma. Case report.

The authors report on a patient who exhibited intractable epilepsy due to an inaccessible hypothalamic hamartoma and subsequently underwent stereotactic radiosurgery. This 25-year-old man had a 24-year history of intractable gelastic and tonic-clonic seizures. Magnetic resonance (MR) imaging performed at examination as well as that performed 30 months earlier demonstrated a nonenhancing and nonprogressive spherical mass, approximately 10 mm in diameter, located on the patient's right side at the floor of the third ventricle. Focal radiation treatment performed with a gamma knife unit administered 36 Gy to the center and 18 Gy to the periphery of the lesion. This treatment resulted in an improvement in seizure control. Before the patient underwent radiosurgery, he suffered from three to six generalized seizures per month in spite of attentive compliance with an anticonvulsant medication regimen. After irradiation of the harmatoma, the frequency of the seizures transiently increased and then subsided 3 months posttreatment. The patient has been free of seizures for the last 21 months, with no neurological or endocrinological complications. Magnetic resonance imaging performed 12 months posttreatment demonstrated complete disappearance of the lesion.

Adult↗
PubMed1997

Effect of beclomethasone dipropionate inhalation on eosinophilic bronchitis in patients with silicosis.

The efficacy of beclomethasone dipropionate (CAS 5534-09-8, BDP, beclomethasone) inhalation therapy over the course of 12 months were evaluated in 42 patients with established chronic silicosis. Their pulmonary functions were monitored every 3 months and volume of sputum production was established daily. Subjects were divided randomly into two groups; 21 patients (BDP group) were treated with BDP (400 micrograms/day) by way of a metered-dose inhaler, while the 21 controls did not receive the BDP inhalation therapy. Although FVC (forced vital capacity), FEV1 (forced expiratory volume in 1 s), MMEF (maximal mean expiratory flow) and arterial blood oxygen tension did not improve significantly, sputum production significantly decreased in the BDP group. The patients who responded most dramatically to the treatment presented with sputum eosinophilia and elevated serum IgE levels prior to therapy. Pulmonary tuberculosis or exacerbation of chronic airway infection was not observed in any of the patients. These results suggest that corticosteroid inhalation therapy is helpful in the management of chronic silicosis, especially in patients with sputum eosinophilia. Positive atopic factors may be related to the pathogenesis of eosinophilic bronchitis, a complication of chronic silicosis.

Aged↗
PubMed1994

Serotonin protects C6 glioma cells from glutamate toxicity.

It was recently shown that addition of L-glutamate in millimolar amounts to a culture of C6 glioma cells induced cell death within 24 h. The mechanism for glutamate toxicity in the C6 glioma cells is linked to the inhibition of cystine uptake, leading to glutathione depletion through the cystine/glutamate antiporter (Xc) system. In the present study, neurotransmitters, whose receptors were localized on the glioma (glial) cells, were evaluated for their ability to protect C6 cells from glutamate toxicity through this amino acid antiporter. Among them, only 100 microM serotonin suppressed cell death by glutamate in a constant co-existence culture. The suppressive dose of serotonin was relatively low and the half-effective dose was about 35 microM. 8-Hydroxy-2-(DL-n-propylamino)tetralin, a specific serotonin1A agonist, showed a comparable suppression to glutamate damage, while 1-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane, a specific serotonin2 agonist, and quipazine, a non-selective serotonin1B agonist, did not suppress it. Furthermore, propranolol and pindolol significantly blocked the serotonin effect, but spiperone, mianserin and ketanserin did not block it. These results strongly indicate that this protective action of serotonin to glutamate toxicity was receptor (serotonin1A) mediated. Serotonin did not protect the C6 cells from glutathione depletion by glutamate. The cellular level of glutathione was depleted even under the co-existence of serotonin and glutamate. Serotonin induced a significant inhibition of lipid peroxide accumulation in the C6 glioma cells to glutamate exposure and the low rate of lipid peroxide accumulation was controlled.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1993

Effect of salt concentration of buffer on the binding of sodium dodecyl sulfate and on the viscosity behavior of the protein polypeptide derived from bovine serum albumin in the presence of the surfactant.

The complex between SDS and a protein polypeptide derived from bovine serum albumin was characterized with respect to binding of SDS and viscosity behavior. The amount of bound SDS increased from 1.0 to 2.2 g/g with increase of the buffer concentration from 10 to 220 mM. A logarithmic plot of the amount of bound SDS against the buffer concentration gave a linear relation like in the plot where the number of SDS molecules constituting a spherical micelle of SDS is plotted similarly. The increase in the buffer concentration up to 25 mM, from 25 to 100 mM and beyond 100 mM, was accompanied by a sharp rise, monotonic decrease and levelling-off of the intrinsic viscosity in the respective region. In the region 45-175 mM, a linear relation was found between the intrinsic viscosity and reciprocal square root of the buffer concentration. The observed changes can be interpreted as follows: (1), the electrostatic repulsion between charges introduced by the bound SDS caused the initial increase; (2), shielding of the charges as the result of ion condensation with further increase in ionic strength caused the viscosity drop and subsequent levelling-off. The characteristics of the plots are consistent with the necklace model proposed previously for such complexes in which SDS is bound to a protein polypeptide forming micelle-like clusters and which behave like a flexible polyelectrolyte (Shirahama, K., Tsujii, K. and Takagi, T. (1974) J. Biochem. 75, 309-319).

Buffers↗
PubMed1993

Fibroblast growth factor induces proliferating cell nuclear antigen-immunoreactive cells in goldfish retina.

New rod photoreceptors are added to mature teleost retinas throughout life by regulated proliferation of rod precursor cells (RPCs). In this study, candidate regulators of RPC proliferation, acidic and basic fibroblast growth factors (aFGF and bFGF; 0.1 microgram/eye), interleukin-6 (IL-6; 0.1 microgram) and phytohaemagglutinin (HA15; 1.0 microgram), were injected intravitreally into one eye of goldfish (body length 5-6 cm), and mitotic RPCs in both retinas were detected and counted 3-50 days later by immunohistochemistry for proliferating cell nuclear antigen (PCNA). Retinal integrity after treatment was assessed by immunohistochemistry for tyrosine hydroxylase (TH) and other retinal antigens. All the agents applied altered the density of PCNA-immunoreactive (ir) cells in the outer and inner nuclear layers (ONL and INL) in both retinas as soon as 2-3 days after unilateral injection. Initially (2-20 days after injection), particularly in the treated retina, PCNA-ir cells appeared in clusters accompanied by various numbers of scattered individual cells, but subsequently the clusters of PCNA-ir cells disappeared while the density of singly distributed cells increased until 30 days after injection. At the doses given, these effects were most striking with aFGF and bFGF and less with IL-6 and HA15. In radial cryosections, other cellular elements immunoreactive to markers such as TH, serotonin, neuropeptide Y, substance P, glutamine synthetase, glial fibrillary acidic protein and protein kinase C, were found normal in terms of morphology. In addition, a monoclonal antibody (NN-2) was found to label some non-neuronal structures (macrophages, microglia and blood vessels) inside and outside the retina intoxicated with 6-hydroxydopamine, a few NN-2-ir cells being PCNA-positive. However, clustered PCNA-ir and marginal neuroblast cells were NN-2-negative. These results indicate that FGFs may play an important role in stimulating the proliferation of RPCs, for example, in the regeneration of fish retinas following neurotoxic destruction.

Animals↗
PubMed1992

An immunohistochemical study of regenerating newt retinas.

Light-microscopical examination was carried out to investigate the emergence and development of several classes of immunoreactive cells in regenerating retinas of the adult newt (Triturus pyrrhogaster) after total retinal ablation. Immunoreactive proliferating cell nuclear antigen (ir-PCNA, a marker for replicating cells) was present in nuclei of all neuroblasts in the early mono-layered to several-layered stages (15-20 days after retinal ablation; days 15-20), but was lost progressively in an intermediate-to-central/peripheral order as cells and layers increased (days 20-25). Cells, which had lost ir-PCNA, began to separate to form the outer nuclear, inner nuclear and ganglion cell layers around days 25-30 (the cell separation stage). Finally, the location of ir-PCNA was restricted to a band of neuroblast cells at the retinal margin (days 30-35) as seen in intact adult retinas. Visinin-immunoreactive (ir) cells, mainly destined to be cones, appeared first singly or as clusters at the most distal layer in the intermediate region of retinas multi-layered with PCNA-ir neuroblasts, which was followed by appearance of opsin-ir rod outer segments and tyrosine hydroxylase-ir amacrine cells around the cell separation stage. Shortly later, cells respectively immunoreactive to glutamic acid decarboxylase, neuropeptide Y, serotonin, glucagon, glutamine synthetase, glial fibrillary acidic protein, substance P and protein kinase C were found to emerge also in an intermediate-to-central/peripheral sequence. Some of the glucagon-ir cells appeared to be of an interplexiform type.

Animals↗
PubMed1991

Induction of immunoreactive proliferating cell nuclear antigen (PCNA) in goldfish retina following intravitreal injection with tunicamycin.

Effects of a photoreceptor-specific biotoxin, tunicamycin (TM), injected intravitreally into the goldfish eye at one side, were explored on electroretinograms (ERGs) and proliferating cell nuclear antigen-immunoreactive (PCNA-ir) nuclei, representing the mitotic activity of rod precursors, in the retina at both sides. The eye-cup preparations were made for ERG recording, and the retinas were isolated and processed as cryosections or wholemounts by a routine immunohistochemical method for visinin (cones), opsin (rods), tyrosine hydroxylase (dopaminergic cells) and proliferating cell nuclear antigen (PCNA), at various intervals after intravitreal injection with TM (1.0 micrograms/eye). On some thin sections, autoradiographic study was combined following intravitreal injection with [3H]thymidine (TdR, 0.1 microCi/eye). The dose of TM used heavily destroyed cones and rods only in the treated retinas 2-15 days after injection, the photoreceptors being renewed for further 15-20 days. Approximately in parallel, ERGs were largely impaired 2-10 days after TM injection and recovered for 10-20 days. However, intravitreal TM altered the distribution and density of PCNA-ir nuclei in both treated and untreated retinas. The density of PCNA-ir nuclei reduced at first (on days 1 and 2), and then clustered and rapidly increased on days 3-5 and maintained at high levels with diffuse distribution over the whole area, particularly in the treated retinas, up to 60 days after TM injection; the maximum peak of 3.7 and 20 times the initial level was seen on day 20 in the outer nuclear layer (ONL) and inner nuclear layer (INL), respectively. PCNA-ir nuclei were found to be abundant in the ONL even after the photoreceptors and ERGs had been restored in the treated retinas on day 20, suggesting a kind of overproduction of retinal cells. The autoradiographic study provided comparable results to those obtained with PCNA immunohistochemistry. The mechanism by which damage to the treated retina causes rod precursor cells to proliferate in the untreated retina remains unresolved.

Animals↗
PubMed1989

[Combination chemotherapy of ovarian cancer with cisplatinum, aclarubicin and tegafur].

Two hundred fifty-nine patients with ovarian cancers were treated with the combination of CDDP, aclarubicin and tegafur. Ninety-seven of them had macroscopic diseases during the combination chemotherapy, and the overall anti-tumor response rate (CR + PR) for these patients was 54.6%. It was 60.0% for the 80 cases with epithelial ovarian cancer among them. The median survival time for the antitumor responders was 18 months, against 7 months for the non-responders and 18 months for 103 patients with advanced ovarian cancer (stage III-IV).

Aclarubicin↗
PubMed1987

Chemistry and inhibitory activity of long chain fatty acid oxidation of emeriamine and its analogues.

Emericedins A, B, and C, new betaines having inhibitory activity of long chain fatty acid oxidation, were isolated from the culture broth of Emericella quadrilineata IFO 5859. Their structures were determined by spectroscopic analyses as (R)-3-(acylamino)-4-(trimethylammonio)butyrate (acyl: A, acetyl; B, propionyl; C, n-butyryl). Structural confirmation and assignment of absolute configuration were made by chemical synthesis from L-asparagine. Deacylation of emericedin gave a potent derivative, (R)-3-amino-4-(trimethylammonio)butyrate, designated as emeriamine. In order to study the structure-activity relations, various analogues of emeriamine, including a stereoisomer, were prepared. Among them, N-palmitoyl and N-myristoyl derivatives showed much stronger inhibition of fatty acid oxidation than emeriamine.

Animals↗
PubMed1987

[Immunohistochemical and biochemical investigations on glutathione S-transferases in the human placenta].

GST-pi can be purified as a major molecular form of glutathione S-transferase (GST) in human placenta. In this paper, the localization of GST-pi as well as of neutral and basic GSTs in the first, second and third trimester placental tissues (10, 3 and 14 samples, respectively) was investigated immunohistochemically using antibodies to acidic GST-pi from the placenta, neutral GST-mu and basic GST-I from the liver. Total GST activity was assayed using 1-chloro-2,4-dinitrobenzene as a substrate, and the relative activity and content of GST-pi were determined by activity inhibition test and single radial immunodiffusion, respectively, on 4 first and 5 third trimester placental tissues. The results obtained were as follows. In early placenta, cytotrophoblasts were strongly stained by anti-GST-pi antibody, while in third placenta mainly syncytiotrophoblasts were stained. GST-mu was stained only in syncytiotrophoblast in early placenta, while basic GST-I was weakly stained in the various cells in early to term placenta. Total GST activity in early and term placentas was 5.8 +/- 2.0 units/g of tissue (mean +/- S.D.) and 14.8 +/- 3.4 units/g, respectively. GST-pi relative activities were 90 +/- 4% and 85 +/- 6%, and GST-pi content was 41 +/- 31 micrograms/g and 106 +/- 29 micrograms/g, respectively. These results indicate that GST-pi is a major form of GST and localized mainly in trophoblasts at any developmental stage of the placenta, and it increases with development.

Cell Cycle↗