PubMed Health⌕ Search

Biomedical subjects

S Hashizume

Publications and source records attributed to S Hashizume.

At least 91 records · Page 5Linked to original sources
PubMed1985

Human-human hybridomas secreting antibodies specific to human lung carcinoma.

Human Namalwa cells were screened in serum-free medium and in 6-thioguanine, then fused with human lymphocytes from lymph nodes of lung adenocarcinoma cancer patients. Extensive testing using 14 lung cancer cell lines, 11 other cancer cell lines and 4 normal fibroblast lines identified monoclonal antibodies produced by 4 hybridoma clones that reacted specifically with lung adenocarcinoma cells. These monoclonal antibodies also reacted with lung adenocarcinoma tissues and not normal tissues or erythrocytes of any blood type. These hybridoma clones grew and stably secreted the antibodies in serum-free medium as well as in serum-containing medium.

Adenocarcinoma↗
PubMed1985

Gene structures of low-neurovirulent vaccinia virus LC16m0, LC16m8, and their Lister original (LO) strains.

Vaccinia viruses LC16m0 and LC16m8 are temperature-sensitive and low-neurovirulent variants derived from the Lister (Elstree) (LO) strain. Analyses of genome DNAs by digestion with restriction endonucleases and cross-hybridization of the digested fragments revealed that LC16m0 and LC16m8 possess a new XhoI site in addition to the 14 XhoI sites of LO. This new site is located at about 12 X 10(6) daltons from the right terminal end. There was no significant difference in the genome structures between the LC16 variants and LO except the new XhoI site and their terminal fragments which were not identified in LO owing to their heterogeneity. With HindIII digested fragments, there was no difference among the three viruses. This complete mapping raised the possibility that the putative gene responsible for temperature sensitivity and neurovirulence is located at the region of the XhoI site found in LC16m0 and LC16m8.

Cloning, Molecular↗
PubMed1985

[Antitumor effects of recombinant human leukocyte interferon (rIFN-alpha A) on human malignomas transplanted into nude mice].

The antitumor effects of recombinant human leukocyte interferon (rIFN-alpha A) on human malignant melanomas (SK-14 and AM-1) were studied using a nude mouse-human tumor xenograft system. Intratumoral administration of 6 X 10(5)U of rIFN-alpha A significantly inhibited proliferation of SK-14 and inhibited that of AM-1 moderately. This result indicated that the sensitivity of human melanoma to rIFN-alpha A varied with the cell line. The effects of rIFN-alpha A were found to be dose-dependent, in that it was necessary for a relatively large dose of rIFN-alpha A to be injected in order to produce an appreciable effect on human tumors. Antitumor activities achieved depended on the routes of administration used, intratumoral being more effective than intraperitoneal. The effects of rIFN-alpha A were about equal to those of human lymphoblastoid interferon (HLBI).

Animals↗
PubMed1985

[Clinical observation of non-gonococcal urethritis].

Sixty-one male urethritis cases, 28 gonococcal urethritis and 33 nongonococcal urethritis (NGU), were out-patients at the Department of Urology, Asahi General Hospital, during the 4 months, Oct. 1, 1984-Jan. 31, 1985. Thirteen of the 33 NGU patients (39.4%) were infected with C. trachomatis (CT). The efficacy of Doxycycline and the route of infection was studied in the cases of CT-positive CT-negative-NGU. CT infection from prostitutes was not so frequent as in the other pathogen infection of NGU. The efficacy of Doxycycline (100 mg b.i.d. for 2 weeks) against CT infection was excellent in the disappearance of subjective complaints and that of white blood cells in the urethral discharge in the CT positive-NGU group (13/13), in comparison with CT negative-NGU group (7/18). The efficacy of Doxycycline against CT was also confirmed from the follow-up study by the isolation of CT and by detection of CT antigen from urethral swabs using FITC conjugated monoclonal antibody against CT antigen.

Chlamydia Infections↗
PubMed1984

[The effect of human lymphoblastoid interferon (HLBI) on the growth of 2 human malignant melanoma xenografts in nude mice].

The effects of Human Lymphoblastoid Interferon ( HLBI ) on the growth of 2 human malignant melanoma xenografts in nude mice were investigated. At a dose of 6 X 10(5) IU, the growth of SK-14 was significantly inhibited by intratumoral administration, whereas that of AM-1 was only moderately by inhibited. Tumor cell of SK-14 was found to be degenerated and replaced with melanophages by histological observation, while that of AM-1 showed no significant changes. Dose response of the inhibitory effect of HLBI (6 X 10(5)IU, 1 X 10(5)IU) was investigated against tumor cell of SK-14. At a dose of 6 X 10(5)IU, the growth was strongly inhibited, whereas 1 X 10(5)IU showed only a moderate effect. In conclusion, the sensitivity of malignant melanoma xenograft to the inhibitory effect of HLBI varied with the cell line. It was considered that a relative large dose of HLBI was necessary for an appreciable effect on the malignant melanoma xenograft.

Animals↗
PubMed1983

Identification of lactoferrin as an essential growth factor for human lymphocytic cell lines in serum-free medium.

A serum-free medium supplemented with growth factor(s) was devised to grow human lymphocytic cell lines. The medium was developed using human lymphocytic cell line, Bri 7 cells. In the process of constructing the medium, human lactoferrin was found to be an essential growth factor for the cell line. Human lactoferrin has higher growth stimulatory activity than human transferrin, and was sensitive to heat. Long-term cultivation of the cells was achieved in the defined medium supplemented with human lactoferrin only. The defined medium specifically supported the growth of various other human B- and T-lymphocytic cell lines but not the growth of various mouse lymphocytic cell lines. In lactoferrin-supplemented medium, the growth of some human cell lines were further stimulated by the addition of a combination of insulin, ethanolamine and selenium, or another combination of 2-mercaptoethanol and the above three factors. Bovine lactoferrin could be substituted for human lactoferrin.

Animals↗
PubMed1983

Incorporation of glutamic acid into protein by a soluble system.

A heat-labile, non-dialyzable factor(s) in soluble fractions from Escherichia coli strains and Bacillus subtilis was found to incorporate the radioactivity of [14C]glutamic acid into 95 degrees C CCl3COOH-insoluble fraction. Incorporation catalyzed by a partially purified factor from E. coli B required ATP, Mg2+, tRNA, casein, carbonate, and 2-mercaptoethanol. A mixture of nineteen amino acids other than glutamic acid had no effect on the incorporation. Heparin, spermine and monovalent cations were inhibitory. Incorporation proceeded via glutamyl-tRNA. The incorporation from [14C]glutamyl-tRNA required Mg2+, casein, carbonate, and 2-mercaptoethanol, and there was no incorporation from [14C]aspartyl-tRNA. The reaction product was identified as protein. The incorporated moiety was the glutamyl moiety of glutamic acid and it retained a free alpha-amino group in the product protein. The incorporating factor of E. coli B was demonstrated to be glutamyl-tRNA synthetase.

Bacillus subtilis↗
PubMed1983

Effects of human fibroblast interferon on human tumors transplanted into nude mice: sensitivity of malignant melanoma.

The antitumor effects of human fibroblast interferon (HuIFN-beta) on three lines of human malignant melanoma (AM-1, SK-14, SK-2) were studied using a nude mouse-human tumor xenograft system. The sensitivity of melanoma to interferon in relation to melanin productivity was investigated. Intratumoral administration of 6 X 10(5) IU of HuIFN-beta significantly inhibited proliferation of AM-1 and SK-14, but did not inhibit that of SK-2. The sensitivity to HuIFN-beta was in the order of SK-14, AM-1 and SK-2, and was well correlated with the susceptibility of cell division observed histologically. Although these tumors differ in production of melanin, difference in sensitivity to HuIFN-beta due to melanin productivity was not clear. The relationship between the antitumor effect and the administration method was studied with SK-14, which was the most sensitive to HuIFN-beta. Antitumoral activities depending on the routes of administration were in the order of intratumoral, peritumoral-subcutaneous and intraperitoneal. Intratumoral and subcutaneous administrations of high doses brought about complete disappearance of the tumor cells or decrease in size of the tumor mass.

Animals↗
PubMed1977

Comparative studies of several vaccinia virus strains by intrathalamic inoculation into cynomolgus monkeys.

From the comparative studies of the virulence of several vaccinia virus strains by intrathalamic inoculation into cynomolgus monkeys, the following results were observed. The CV1 virus was most virulent, the New York City Board of Health, Ikeda, EM63, and Lister viruses were slightly less virulent, and DIs and LC16 viruses least virulent. The characteristic findings were widespread inflammatory lesions in the meninges and choroid plexus which were closely associated with the replication of vaccinia virus, and parenchymal lesions which might be referred to a encephalopathy in the deceased monkeys. Meningoencephalitis was, however, ofter recognized in the monkeys sacrificed at 14 days postinoculation and those dying late.

Animals↗
PubMed1976

Effect of temperature on the viability of Bacillus stearothermophilus.

One of the obligate thermophilic bacteria, Bacillus stearothermophilus, was unable to grow at temperatures below 35 degrees C. About 80% of the population in the bacterial culture died at the temperatures, and the same extent of loss in either of the activities of oxygen consumption or synthesis of protein or nucleic acid of the organisms was observed. With the progress of death of the organisms, reduced nicotinamide-adenine dinucleotide came to be oxidized by the organisms, enzymes such as fructose-1,6-diphosphate aldolase, when the organisms were washed with phosphate buffer, were leaked out of the organisms, and an increasing amount of ribonucleoprotein was released into the culture medium. The change of the membrane state was then suggested to be one of the possible causes for the death of the organisms at the temperatures.

Bacterial Proteins↗