PubMed Health⌕ Search

Biomedical subjects

Y Aida

Publications and source records attributed to Y Aida.

At least 127 records · Page 7Linked to original sources
PubMed1987

Muramyl dipeptide induced augmentation of the proliferative response of thymocytes to phytohemagglutinin.

N-Acetylmuramyl-L-alanyl-D-isoglutamine (MDP) augmented the proliferative response of thymocytes to phytohemagglutinin (PHA). The augmenting effect of MDP disappeared by passage of glass-nonadherent thymocytes through Sephadex G-10 (G-10) column or by removal of low density cells by the Ficoll-Conray gradient centrifugation. The diminished augmenting effects of MDP on the proliferative response of glass-nonadherent-G-10 nonadherent thymocytes was restored by the addition of the G-10 adherent cells. When G-10 adherent cell fraction was extensively depleted of macrophages by glass adherence and EA-rosetting, it was found that neither the macrophage-depleted G-10 adherent cell fraction nor the macrophage fraction supported by itself the proliferative response of G-10 nonadherent thymocytes. However, addition of macrophage fraction together with the macrophage-depleted G-10 adherent cells did support the proliferation of G-10 nonadherent thymocytes. It was further shown that peritoneal exudate macrophages could be substituted for thymic macrophage fraction. These results suggested that both the G-10 adherent-glass nonadherent cells and macrophages were essential for the MDP-induced augmentation of the proliferative response of thymocytes to PHA and these cells exerted different accessory roles in this response.

Acetylmuramyl-Alanyl-Isoglutamine↗
PubMed1987

Radiolocalization of bovine lymphosarcoma cells in athymic mice, using a monoclonal antibody against tumor-associated antigens.

Mouse monoclonal antibody c 143 was purified and F(ab')2 fragments were generated by pepsin digestion and then radiolabeled with 125I. The 125I-labeled c 143 F(ab')2 fragments were injected into athymic mice bearing bovine lymphoid tumor cells. The fragments became preferentially localized in tumor tissues, but not in normal tissues, as determined by differential counting of tissue radioactivity. The fragments became localized specifically in those tumors that were reactive with c 143 in vitro, but did not become localized in unrelated tumors. Localization of labeled F(ab')2 fragments of a monoclonal antibody of the same isotype directed against Taka virus (a variant of Newcastle disease virus) was not observed in athymic mice bearing bovine lymphoid tumor cells. Tumors were detectable by radioimmunoscintigraphy, using radiolabeled c 143 F(ab')2 fragments, without background subtraction, and by use of silver-grain scattering in light microscopic autoradiography.

Animals↗
PubMed1987

Use of viable-cell ELISA for detection of monoclonal antibodies recognizing tumor-associated antigens on bovine lymphosarcoma cells.

An ELISA, using viable bovine lymphosarcoma cells, was developed to detect tumor-associated antigens (TAA) expressed on lymphosarcoma cells from cows with enzootic bovine leukosis (EBL). Monoclonal antibodies (MAB) against TAA were used. Using viable-cell ELISA, MAB reacted with tumor cells from 9 cows with EBL, but not with peripheral blood lymphocytes from 10 clinically normal cows. Titers of MAB against tumor cells from 1 cow with EBL were 2,048 (direct immunofluorescence assay), 8,192 (flow cytometry), 2,048 (fixed-cell ELISA), and 16,384 (viable-cell ELISA). Viable-cell ELISA was the most sensitive method for detection of TAA. Reactivities of 7 MAB to tumor cells from cows with EBL were compared between viable-cell ELISA and a complement-dependent antibody cytotoxicity test. Of 5 MAB with no cytotoxic activity against tumor cells, 3 were reactive against tumor cells from the same cow, as determined by viable-cell ELISA, with titers ranging from 128 to 2,048.

Animals↗
PubMed1987

[Clinical effect of terodiline hydrochloride on nervous pollakisuria or irritative bladder].

The clinical effect of terodiline hydrochloride (TD-758) was studied in 95 patients with nervous pollakisuria or irritative bladder. TD-758 was given per os randomly at a dose of 24 mg or 12 mg once a day for 4 weeks. The symptoms such as urinary frequency, urinary incontinence and sense of residual urine were improved in 74% of the patients taking 24 mg, and in 51% of the patients taking 12 mg. The difference was statistically significant. Side effects such as dry mouth, constipation and heart burn were observed in 15% of the patients in each group and were not serious. The results of this study indicate that TD-758 is useful for these patients and its optimal dosage is 24 mg once a day.

Administration, Oral↗
PubMed1986

Establishment of B-cell lines from tumor of enzootic bovine leukosis.

Two lymphoid cell lines were established from enzootic bovine leukosis tumor cells. Suspension cell cultures of these cell lines have been maintained in vitro for over 2 yr. The cell grew as floating cells without attaching to the glass surface. These 2 cell lines have B-cell surface marker, tumor-associated antigen on the cell surface and bovine leukemia provirus in the genomes.

Animals↗
PubMed1986

Effects of disodium ethane-1-hydroxy-1,1-diphosphonate (EHDP) on interleukin 1 production by macrophages.

The effects of disodium ethane-1-hydroxy-1,1-diphosphonate (EHDP) on the in vitro functions of guinea pig macrophages were studied. A high dose (1 mg/ml) of EHDP inhibited interleukin 1 (IL 1) production by oil-induced peritoneal macrophages stimulated with muramyl dipeptide (MDP), lipopolysaccharide (LPS), phorbol myristic acetate (PMA), heat-aggregated IgG2 or calcium ionophore A23187. On the other hand, low doses (less than 0.125 mg/ml) of EHDP augmented the MDP induced IL 1 production by macrophages. This biphasic effect was also observed when macrophages were exposed to EHDP at 37 C for 24 hr and then stimulated with IL 1 inducers. Superoxide anion generation induced by formyl peptide or PMA was not affected by preincubation of the macrophages with doses of EHDP up to 1 mg/ml. Adherence and spreading of macrophages was inhibited by EHDP in a dose dependent manner without affecting cell viability. These results demonstrated that EHDP acted on macrophages directly and modulated IL 1 production in vitro.

Acetylmuramyl-Alanyl-Isoglutamine↗
PubMed1986

[Effect of oxybutynin hydrochloride on isolated smooth muscles (ileum, urinary bladder and urethra)].

Effects of oxybutynin hydrochloride on isolated smooth muscle were investigated in preparations of isolated rabbit bladder body, bladder base, collum vesicae and urethra. ACh produced a marked contraction of the preparation from the bladder body and produced no response in the collum vesicae and the urethra; however, NE caused a marked contraction of the preparations from the collum vesicae and the urethra and relaxation in the bladder body. Oxybutynin and papaverine hardly had any effect on these preparations. Effects of oxybutynin on the contractile response of the isolated ileum or urinary bladder of rabbit, guinea pig and rat in comparison with atropine, papaverine, flavoxate and other drugs were investigated. The responsibility of these preparations to ACh were approximately 100 times higher in the ileum than in the urinary bladder. Oxybutynin showed a competitive inhibition to contractile response induced by ACh in the ileum and urinary bladder, whose potency was about 1/7-1/10 that of atropine. In the ileum of rats which were treated with oxybutynin orally at a dose of 1, 10 or 100 mg/kg for 60 days, the response to ACh in the preparations of the animals treated by 100 mg/kg were decreased, but the anticholinergic action in the groups treated with oxybutynin were not significantly different compared with the nontreated or saline treated group. On the other hand, oxybutynin showed a non-competitive inhibition to contractile response induced by Ba2+, Ca2+ and histamine in the guinea pig ileum and Ba2+, high-K+, Ca2+ and ATP in the rabbit urinary bladder. These potencies of oxybutynin were equal or slightly stronger than that of papaverine or flavoxate. However, oxybutynin had no effect on the contraction induced by NE in the rabbit urethra. The above results suggest that oxybutynin has atropine-like anticholinergic action and direct muscle relaxant action evidenced by non-competitive inhibition to contractile response induced by several agonists.

Acetylcholine↗
PubMed1986

Antitumor effect of adriamycin entrapped in liposomes conjugated with monoclonal antibody against tumor-associated antigen of bovine leukemia cells.

Monoclonal antibody against tumor-associated antigen (TAA) expressed on bovine leukemia cells was conjugated to liposomes containing adriamycin (ADM), and the specificity and therapeutic effects of the conjugates were examined in vitro and in vivo using a TAA-positive bovine leukemia cell line as the target tumor. In vitro studies with the TAA-positive cell line clearly indicated that the antibody-conjugated liposomes containing ADM exerted selective effects on TAA-positive cells in the inhibition assay of 3H-thymidine incorporation. Three injections of liposomes containing ADM (4 mg/kg) into tumor-bearing nude mice significantly inhibited the tumor growth and the therapeutic effect of the antibody-conjugated liposomes was far greater than that of normal mouse IgG-conjugated liposomes as assessed in terms of tumor size.

Animals↗