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Biomedical subjects

S Hanada

Publications and source records attributed to S Hanada.

At least 127 records · Page 7Linked to original sources
PubMed1989

[Investigation on antibodies to human T cell leukemia virus type I in patients with primary glomerulonephritis].

We investigated on antibodies to human T cell leukemia virus type I (anti HTLV-I) in 101 patients with primary glomerulonephritis in Kagoshima prefecture, an endemic area of HTLV-I in Japan. The positive rate in patients with primary glomerulonephritis was 17.8%, which was not significantly higher than in healthy residents 4741 persons of 11.9% in the same area. Classified by renal biopsy findings, the positive rate in patients with membranous nephropathy was 21.4% (9/42), minimal change nephrotic syndrome 14.3% (2/14), IgA nephropathy 15.4% (2/26), and others 15.8% (3/19) respectively, which were not significantly differed from that in healthy residents. Positivity of aged patients (60 years or over) in membranous nephropathy on the contrary was significantly higher than that in healthy residents (p less than 0.01). Further study is required to clarify the relationship between HTLV-I infection and glomerulonephritis.

Adolescent↗
PubMed1988

Adult T-cell leukemia with leukemia cell infiltration into the gastrointestinal tract.

Five cases of untreated adult T-cell leukemia (ATL) with leukemia cell infiltration into the gastrointestinal (GI) tract were reported. X-ray findings of the GI tract showed diffuse abnormal mucosal patterns throughout the GI tract in all five patients. Endoscopic findings corresponded well with the x-ray findings. Pathologic examination of biopsied specimens from all five patients revealed diffuse and extensive leukemic infiltration into the stomach and/or the large intestine.

Adult↗
PubMed1988

A nasal allergy model developed in the guinea pig by intranasal application of 2,4-toluene diisocyanate.

An experimental model of nasal allergy has been developed in guinea pigs by intranasal application of 2,4-toluene diisocyanate (TDI). A 10% TDI solution in ethyl acetate was painted onto the nasal vestibuli of the animals once a day for 5-10 days. During the course of repeated application of TDI, the number of animals which secreted rhinorrhea containing eosinophils increased. Morphological survey of the nasal mucosa showed infiltration of eosinophils and some other changes indicative of acute inflammation. Moreover, mast cells were found not only in the subepithelial connective tissue but also in the epithelial layer. Nasal mucus obtained from the mucosa has been found to be an effective test material for studies of nasal allergy. A striking decrease of specific granules was found in some mast cells contained in the mucus. In parallel with the symptomatology, biochemical and serological studies suggested the involvement of type I allergy in the experimental system; TDI-specific histamine release from the nasal mucosa and positive passive cutaneous anaphylaxis were found 3 weeks after the application of TDI.

Administration, Intranasal↗
PubMed1988

Benzodiazepines and barbiturate potentiate the pre- and postsynaptic gamma-aminobutyric acid (GABA)A receptor-mediated response in the enteric nervous system of guinea pig small intestine.

To determine whether or not presynaptic gamma-aminobutyric acid (GABA) receptors regulate the release of GABA, we examined properties of the presynaptic GABA receptor and compared the findings within the case of the postsynaptic GABA receptor, using the longitudinal muscle with myenteric plexus (L-M) preparation of guinea pig small intestine. Muscimol, but not baclofen, reduced the Ca++-dependent release of [3H]GABA evoked by high K+ in the presence of tetrodotoxin from L-M preparation of the small intestine preloaded with [3H]GABA. Bicuculline, picrotoxin and furosemide antagonized the effect of muscimol. Diazepam, clonazepam and pentobarbital potentiated the muscimol-induced inhibition of high K+-evoked release of [3H]GABA. The potentiating effect of clonazepam was antagonized by Ro 15-1788. Muscimol induced a Ca++-dependent and tetrodotoxin-sensitive release of [3H]acetylcholine from L-M preparation preloaded with [3H]choline. The effect of muscimol was antagonized by bicuculline, picrotoxin and furosemide. Diazepam, clonazepam and pentobarbital potentiated the muscimol-evoked release of [3H]ACh. The potentiation of muscimol effect by clonazepam was inhibited by Ro 15-1788. These results indicate that both the GABA autoreceptor and postsynaptic receptor may possess the same property which is related to benzodiazepine and barbiturate binding sites in the enteric nervous system of the guinea pig small intestine. The benzodiazepine binding site seems to be of central type.

Acetylcholine↗
PubMed1987

Expression of HTLV-I in serum of HTLV-I-related subjects and the early detection of overt ATL in HTLV-I carriers.

Monoclonal antibodies against human T cell leukemia virus type I (HTLV-I) p24 and p19 were produced and employed in the in vivo expression of HTLV-I in some HTLV-I-related subjects by Western blot analysis. The antigenic determinants of these monoclonal antibodies were different from that of natural human anti-HTLV-I antibody examined. Serum p24 was identifiable in almost all of the overt ATL patients (17 of 18, 94%), but not in the chronic ATL cases or HTLV-I carriers. On the other hand, serum p19 was detected in one of the three patients with chronic ATL examined, but not in the overt ATL patients or the HTLV-I carriers. These results indicate that the in vivo expression of HTLV-I p24 and p19 which has reacted with natural anti-HTLV-I antibody can be detected by these monoclonal antibodies. Therefore, the investigation of serum HTLV-I expression may lead to the early detection of overt ATL in an HTLV-I carrier.

Antibodies, Monoclonal↗
PubMed1987

[3H]muscimol binding sites increased in autopsied brains of chronic schizophrenics.

[3H]muscimol binding and glutamic acid decarboxylase (GAD) activity in the prefrontal cortex and caudate nucleus of autopsied brains from 19 chronic schizophrenics and 17 control subjects were investigated. In the schizophrenics, saturation analysis with varying concentrations of [3H]muscimol revealed an increase in the number of GABAA receptors, but there was no significant difference in the affinity. In addition, the enhancement of [3H]muscimol binding by diazepam was significantly greater in schizophrenics than in controls. GAD activity did not differ between controls and schizophrenics. The possibility that GABAergic mechanisms might play a role in case of chronic schizophrenia should be given further attention.

Adult↗
PubMed1987

Contact sensitivity induced in mice by methylene bisphenyl diisocyanate.

An experimental model of contact sensitivity has been developed in C57BL/6 mice using methylene bisphenyl diisocyanate (MDI), a raw material of polyurethane resins. Sensitization through a single epidermal application of 1% MDI solution in ethyl acetate to the backs of the mice resulted in marked ear swelling. The time course of the swelling was characteristic of delayed-type hypersensitivity and the increment of the ear thickness was compatible with that induced by toluene diisocyanate (TDI). Passive transfer of the MDI-induced contact sensitivity was successfully achieved using lymphocytes from the lymph nodes of MDI-sensitized syngeneic mice, and the effector cells were found to be T cells. Cross reaction between MDI and TDI has shown that MDI is not only a potent contact sensitizer but also can form a contact sensitizer group together with TDI.

Administration, Cutaneous↗
PubMed1987

A monoclonal antibody detecting a novel antigen expressed in the HTLV-I-infected cells.

A monoclonal antibody, FTF 148, was prepared by hybridizing murine myelomal cells (NS-1) and spleen cells of BALB/c mice immunized with cultured cells derived from an adult T cell leukemia (ATL) patient (KUT-2 cells). This monoclonal antibody reacted with all of the human T cell leukemia virus I (HTLV-I)-infected cell lines tested but did not react with other T cell lines derived from acute lymphocytic leukemia, Epstein-Barr virus-transformed B cell lines, or an erythroleukemic cell line. This monoclonal antibody was not directed to viral antigens because it reacted equally well with almost all KUT-2 and MT-1 cells, only 1% to 3% of which were ATL-associated antigen-positive. In contrast to interleukin 2 receptors expressed on both ATL cells and normal phytohemagglutinin-stimulated blasts, this antigen was not expressed on the latter cells. The antigen, mainly expressed on the cell membrane, was analyzed by metabolic labeling with 3H-leucine and surface labeling with 125I followed by cell lysis and immunoprecipitation with the FTF 148 antibody. The findings obtained by sodium dodecyl sulfate-polyacrylamide gel electrophoresis revealed that p50 and p74 proteins were specifically precipitated and the antigen was also different from the product of the Xs gene of HTLV-I.

Antibodies, Monoclonal↗