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Biomedical subjects

M Morimoto

Publications and source records attributed to M Morimoto.

At least 307 records · Page 17Linked to original sources
PubMed1986

[A nationwide study of the antimicrobial susceptibility of clinical isolates of Klebsiella sp. in Japan].

We have reported the antimicrobial susceptibility of clinical isolates of Escherichia coli in 1983 and 1984 to 4 antibiotics, ampicillin (ABPC), cefazolin (CEZ), cefmetazole (CMZ) and gentamicin (GM), in the previous report. In this paper, we described the antimicrobial susceptibility of Klebsiella sp. to the same antibiotics during the same period reported for E. coli before. Numbers of isolates tested were 1,671 strains in 1983 and 1,374 strains in 1984. We determined MICs of the 4 antibiotics against isolates by the standard method of the Japan Society of Chemotherapy. The most effective agent was GM among the 4 antibiotics. CMZ had a similar antimicrobial activity to GM. Resistance rates were low for both agents. CEZ had a fairly good antimicrobial activity, but it was less active than GM and CMZ. ABPC was not effective. There was neither significant annual change of antimicrobial activity of each agent against isolates nor an increasing tendency of resistant strains in the last 5 years. Depending on isolates from clinical materials, differences in the susceptibility were noted and there was a high ratio of resistant organisms among isolates from urine.

Ampicillin↗
PubMed1986

[A nationwide study of the antimicrobial susceptibility of clinical isolates of Escherichia coli in Japan].

We studied the antimicrobial susceptibility of E. coli isolated in 1983 and 1984 and also the yearly changes of the susceptibility of E. coli from 1980 to 1984 isolated in 103 hospitals in Japan. Antibiotics used for MIC determination were ampicillin (ABPC) as a penicillin, cefazolin (CEZ) as a cephalosporin, cefmetazole (CMZ) as a cephamycin and gentamicin (GM) as an aminoglycoside. Numbers of isolates tested were 2,321 strains in 1983 and 1,965 strains in 1984. CMZ was the most effective agent among the 4 antibiotics tested, followed by GM and CEZ in this order. A large number of the isolates were inhibited by 1.56 micrograms/ml on CMZ and GM and by 6.25 micrograms/ml of CEZ. About two-thirds of the isolates were inhibited at a concentration of 12.5 micrograms/ml or less of ABPC. The susceptibility of E. coli against the 4 antibiotics changed little year by year and the tendency of the appearance of resistant strains did not increase in the last 5 years.

Ampicillin↗
PubMed1986

[Distribution pattern of fibronectin in human lung cancer tissue].

The distribution pattern of fibronectin in human lung cancer tissues has been studied using the indirect immunoperoxidase technique. In adenocarcinoma fibronectin is observed in the basal side of cancer cells and tumor stroma. In squamous cell carcinoma, it is seen in the basal side of cancer cells, surface of cancer cells and tumor stroma. The difference between adenocarcinoma and squamous cell carcinoma in invasion and metastasis was investigated to have some relation to the distribution pattern of fibronectin.

Adenocarcinoma↗
PubMed1985

Tricarbon monoxide in TMC-1.

We report the measurement of three new lines of C3O in TMC-1. The observed peak antenna temperatures, appropriately corrected for atmospheric and telescope losses, are found to be consistent with a large velocity gradient radiative transfer model whose parameters span the range of standard values for this cloud. The derived fractional abundance for C3O is 1.4 x 10(-10), comparable with the results predicted from a model calculation based on a gas-phase ion-molecule reaction scheme. The results of negative searches for C3O in six other sources are not inconsistent with expected conditions in these clouds.

Astronomical Phenomena↗
PubMed1985

Post-traumatic epidural hematoma in two patients with long-standing "arrested" hydrocephalus.

The occurrence of a post-traumatic epidural hematoma in two patients with long-standing "arrested" hydrocephalus is reported. There was a relatively long interval between the head injury and the onset of symptoms. The large hematoma was accommodated by the decrease in size of the markedly dilated ventricles. This report stresses the possibility of the presence of an epidural hematoma in the management of head injury in patients with long-standing "arrested" hydrocephalus.

Adult↗
PubMed1985

Antitumor activity of echinosporin.

Echinosporin isolated from a Streptomyces culture showed antitumor activity against rodent tumor models such as leukemia P388, P388/VCR, and fibrosarcoma Meth 1. It was marginally active against melanoma B16 and sarcoma 180. It was not active against Lewis lung carcinoma and xenograft MX-1. It inhibited the colony formation of HeLa S3 cells with a wide shoulder at low dose ranges. DNA, RNA, and protein synthesis were inhibited by echinosporin. It depressed WBC with nadir on day 3, but the recovery to the normal level after echinosporin injection was more rapid than that after mitomycin C.

Animals↗
PubMed1985

Characteristics of antiviral and anticellular activities of human recombinant interferon-gamma.

The antiviral and anticellular activities of recombinant human interferon-gamma (Re-IFN-gamma) were compared with those of natural human interferon-gamma (IFN-gamma), natural human interferon-alpha (IFN-alpha), and recombinant human interferon-beta (ReIFN-beta). ReIFN-gamma and IFN-gamma induced the antiviral state in FL cells against Sindbis virus more rapidly than IFN-alpha or ReIFN-beta. The antiviral state induced by a short exposure time to IFN-gamma declined rapidly after the removal of IFN-gamma and the incubation of FL cells in fresh medium, whereas that induced by ReIFN-gamma was persistent. However, other characteristics of the antiviral activity of ReIFN-gamma were shown to be very similar to those of IFN-gamma (e.g., stability at 56 degrees or pH 2.0, and neutralization by anti-IFN serum). The anticellular spectrum of ReIFN-gamma or IFN-gamma against 26 human cell lines differed in some respects from that of IFN-alpha or ReIFN-beta, since ReIFN-gamma and IFN-gamma were more effective at inhibiting the growth of human carcinoma or sarcoma cell lines. The IC50 (IFN concentration required for 50% growth inhibition) values of ReIFN-gamma were several times smaller than those of IFN-gamma in all cell lines sensitive to both IFNs. ReIFN-gamma and IFN-gamma, but not IFN-alpha or ReIFN-beta, were cytotoxic against HeLa S3 cells. These cytotoxicities of both IFNs were inactivated by treatment at 56 degrees or pH 2.0 and by anti-ReIFN-gamma serum. These results indicate that the characteristics of antiviral and anticellular activities of ReIFN-gamma are somewhat different from those of other IFNs including IFN-gamma.

Animals↗
PubMed1985

The different effects of recombinant human interferon-gamma and recombinant human interferon-beta on the activation of natural killer cells.

Highly purified recombinant human interferon-gamma produced by Escherichia coli (ReIFN-gamma) was examined for ability to stimulate natural killer (NK) cell cytotoxic activity and antibody-dependent cell-mediated cytotoxicity in human peripheral blood lymphocytes (PBLs) in comparison with natural human interferon-gamma (IFN-gamma) and with recombinant human interferon-beta produced by E. coli (ReIFN-beta). The activity of ReIFN-gamma to stimulate NK cell cytotoxicity was about 10 times greater than that of ReIFN-beta and similar to that of IFN-gamma when PBLs were pretreated with each interferon for 16 hr. The effects of ReIFN-gamma were completely neutralized by a rabbit anti-ReIFN-gamma antibody, but not by a rabbit anti-ReIFN-beta. ReIFN-gamma did not show any significant NK-enhancing effect when it was added directly to the killing phase of standard 51Cr-release assay for 4 hr, while ReIFN-beta showed a marked effect. The time course study showed that the NK-activating effect of ReIFN-gamma was not expressed until 2 hr after the start of incubation, while that of ReIFN-beta was expressed rapidly and sufficiently within 15 min. This kinetic difference between ReIFN-gamma and ReIFN-beta was confirmed by an experiment using the Ca2+-pulse method, in which the killing rate in the Ca2+-dependent stage of NK cytolysis was increased by ReIFN-gamma, but only after 6 hr of preincubation, while the effect by ReIFN-beta was expressed rapidly at 30 min. These findings suggest that ReIFN-gamma and ReIFN-beta may stimulate NK cell cytotoxicity through different intracellular events after they bind to their receptors on the surface of NK cells.

Antibodies↗
PubMed1984

Effect of levamisole on cytotoxic T-cell-mediated immune resistance to L1210 murine leukemia in hyperimmune mice.

The effect of levamisole (LMS) on T-cell-mediated antitumor immunity was examined in adult and aged mice hyperimmune to L1210 leukemia. The immune resistance of aged mice was depressed compared with that of adult mice, which almost completely rejected 5 X 10(7) L1210 cells inoculated IP. A significant level of tumor-specific cytotoxicity was detected in the spleen cells of adult hyperimmune mice by the 51Cr-release assay after in vitro sensitization with mitomycin C-treated L1210 cells. This was mediated by cytotoxic T cells, since in vivo administration of antithymocyte serum or in vitro treatment of the spleen cells with anti-Thy 1.2 antibody and complement abrogated the cytotoxicity completely. In aged mice, however, cytotoxic T-cell activity was lower although the animals were immune to L1210. Administration of LMS (0.38 mg/kg) restored the depressed cytotoxicity of aged mice to the level seen in adult mice. Furthermore, in adult hyperimmune mice LMS augmented T-cell-mediated cytotoxic activity and restored the reduced cytotoxicity caused by in vivo administration of antithymocyte serum. These results indicate that LMS was effective in augmenting T-cell-mediated tumor immunity in immunologically competent or deficient hosts.

Aging↗
PubMed1984

Antitumor effect of human recombinant interferon-beta against human melanomas transplanted into nude mice.

The antitumor activity of recombinant human interferon-beta (ReIFN-beta) against 2 human melanomas, Mela3 and SK-MEL-26 cells, transplanted into nude mice was examined, comparing with that of natural interferon-beta (IFN-beta). The growth of Mela3 and SK-MEL-26 cells was inhibited significantly by the daily intravenous injection of 10(8) units(U)/kg of ReIFN-beta for 10 d starting from day 0. The effect of ReIFN-beta decreased when its administration was started from the established stage of tumor development. Intravenous injection of 10(7) U/kg of ReIFN-beta or IFN-beta did not significantly inhibit the growth of Mela3 cells. Mela3 cells, prepared from Mela3-bearing mice which had been injected 10(8) U/kg of ReIFN-beta intravenously for 10 d, showed the slight resistance to ReIFN-beta in vitro. Intratumoral injection of 10(7) U/kg of ReIFN-beta in the established stage of tumor development inhibited the growth of Mela3 and SK-MEL-26 cells significantly. This effect of ReIFN-beta was almost equivalent to that of IFN-beta. From the histological examination, these effects of intratumoral injection of ReIFN-beta or IFN-beta were suggested to be mediated by their direct anticellular activities, but not by immunological activities. These results indicate that the in vivo antitumor activity of ReIFN-beta was not essentially affected by the deficiency of carbohydrate.

Animals↗
PubMed1984

Internuclear fiber connections of vestibular nuclear complex. A horseradish peroxidase study.

Internuclear fiber connections among the superior (SVN), lateral (LVN), medial (MVN) and descending (DVN) vestibular nuclei were examined in cats using retrograde transport of horseradish peroxidase (HRP). HRP was microiontophoretically applied in the respective vestibular nucleus at doses of 300-500 nA for 5-10 min, and with the treatment the HRP injection site was limited to 0.2-0.5 mm in diameter within the nucleus. Major commissural connections were found between the bilateral SVN and between the bilateral DVN. Minor commissural connections were observed from MVN to SVN, LVN and MVN, from DVN to LVN, and from LVN to the contralateral LVN. In the ipsilateral vestibular nuclei, fiber connections were found from LVN to SVN, from MVN to SVN, LVN and DVN, and from DVN to SVN and LVN.

Animals↗