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Biomedical subjects

K Sugimura

Publications and source records attributed to K Sugimura.

At least 307 records · Page 17Linked to original sources
PubMed1979

The inhibitory effect of xanthine derivatives on alkaline phosphatase in the rat brain.

Histochemical and biochemical studies were carried out on the inhibition of alkaline phosphatase (A1-P) activity in rat cerebral cortex with various methylxanthine derivatives. The histochemical study revealed that A1-P activity was completely inhibited with 2 mM theophylline or aminophylline, only slightly inhibited with 5 mM of xanthine, and no way inhibited even with 5 mM of diprophylline or caffeine. The biochemical study showed that A1-P activity was markedly inhibited by 1 mM theophylline, to 36% of the control value, and equally markedly by 1 mM aminophylline to 26% of the control value. It was only inhibited to 99% of the control value even by 5 mM diprophylline and conversely slightly activated, to 110% of the control value, by caffeine. The relationship between the pharmacological activities of methylxanthine derivatives and A1-P was studied, and the biological role of A1-P in the central nervous system was also discussed.

1-Methyl-3-isobutylxanthine↗
PubMed1979

Adjuvant activity of 6-O-mycoloyl derivatives of N-acetylmuramyl-L-seryl-D-isoglutamine and related compounds in mice and guinea pigs.

Adjuvant and antitumor activities of synthetic-6-O-mycoloyl-N-acetylmuramyl-L-seryl-D-isoglutamine and 6-O-mycoloyl-N-acetylmuramyl-glycyl-D-isoglutamine were examined in comparison with those of 6-O-mycoloyl-N-acetylmuramyl-L-alanyl-D-isoglutamine. Synthetic 6-O-mycoloyl-N-acetylmuramyl-L-seryl-D-isoglutamine was active as an adjuvant for the induction of delayed-type hypersensitivity to m-[4-(4'-arsono-phenylazo)-phenyl]-N-acetyl-L-tyrosine in guinea pigs and for cell-mediated cytotoxicity in allogeneic mice. 6-O-mycoloyl-N-acetylmuramyl-glycyl-D-isoglutamine was inactive as an adjuvant for the induction of delayed-type hypersensitivity in guinea pigs; however, it was active for cell-mediated cytotoxicity in allogeneic mice. 6-O-mycoloyl-N-acetylmuramyl-L-seryl-D-isoglutamine and 6-O-mycoloyl-N-acetylmuramyl-glycyl-D-isoglutamine were not pyrogenic in rabbits. The antitumor activity of these 6-O-mycoloyl-N-acetylmuramyldipeptides was examined preliminarily by using transplantable syngeneic mouse tumors.

Adjuvants, Immunologic↗
PubMed1978

Adjuvant activity of synthetic 6-O-"mycoloyl"-N-acetylmuramyl-L-alanyl-D-isoglutamine and related compounds.

Adjuvant and antitumor activities of synthetic 6-O-"mycoloyl"-N-acetylmuramyl-L-alanyl-D-isoglutamine were examined. All the synthetic 6-O-corynomycoloyl-, 6-O-mocardomycoloyl-, and 6-O-mycoloyl-N-acetylmuramyl-L-alanyl-D-isoglutamine were active as adjuvants for cell-mediated immune responses. However, 6-O-mycoloyl-N-acetylmuramyl-L-alanyl-D-isoglutamine was less active as an adjuvant on circulating antibody formation. It was shown that pyrogenic activity of N-acetylmuramyldipeptide was reduced by 6-O-acylation with mycolic acid, but not with nocardomycolic or corynomycolic acid. Tumor-suppression activity was observed by the synthetic 6-O-mycoloyl-N-acetylmuramyl-L-alanyl-D-isoglutamine by using transplantable tumor in syngenic mice.

Acetylmuramyl-Alanyl-Isoglutamine↗
PubMed1978

The effect of ubiquinone-7 and its metabolites on the immune response. IV. Chemical structure-adjuvant activity relationship of quinonyl derivatives on humoral immune response.

The effects of the emulsion of quinonyl acids (QS-n, ES-n, KS-n) and related compounds (QSA-n) in Freund's incomplete adjuvant on the humoral immune response to bacterial alpha-amylase were assayed, and their structure-adjuvant activity relationships were discussed. All the quinonyl acids tested (500 microgram/mouse) enhanced the humoral immune response two to seven times as much as that of the control group, five weeks after immunization. 3'-Methyl and 2', 3'-double bond in the carboxy side chains of ubiquinone metabolites (Q acid-I, -II) were not essential for the adjuvant activity. The conversion of methoxyls on the quinone ring into methyls, and that of benzoquinone into phenol also did not affect the activity, but the activity seemed to depend on the carbon number of the carboxy side chain, and the prominent adjuvant activity was observed in the carboxylates having the carboxyalkyl chain of five to seven carbons. High doses (1 or 5 mg/mouse) of ubiquinone-7 and -2 enhanced the humoral immune response two to three times as much as that of the control group, and quinonyl alcohols (QSA-n) enhanced that with low dose (500 microgram/mouse).

Adjuvants, Immunologic↗
PubMed1977

Macrophage dependency of T-lymphocyte mitogenesis by Nocardia rubra cell-wall skeleton.

The mitogenic activity of the cell-wall skeleton (CWS) of Nocardia rubra on purified splenic T-cells (thymus-derived lymphocytes) was investigated. N. rubra CWS showed remarkable mitogenic activity on normal spleen cells of C57BL/6J mice at concentrations ranging from 10 to 100 microgram per milliliter of culture medium, while, on purified splenic T-cells, N. rubra CWS did not act as an mitogen at any concentration. However, mitogenic activity of N. rubra CWS on T-cells was restored if purified splenic T-cells was reconstituted with X-irradiated peritoneal exudate cells (macrophages). The above results suggest the necessity of macrophages for T-lymphocyte activation by N. rubra CWS as well as PHA-P or Con A.

Animals↗
PubMed1976

Mitogenic activity of the cell walls of mycobacteria, nocardia, corynebacteria and anaerobic coryneforms.

The mitogenic activity of the cell walls prepared from Mycobacterium bovis BCG, Nocardia rubra, Corynebacterium diphtheriae PW8, and four species of Propionibacterium, Corynebacterium parvum ATCC 11829, Propionibacterium acnes C7, Propionibacterium granulosum ATCC 25564 and Propionibacterium avidum ATCC 25577, were investigated. These cell walls were active as mitogens on normal spleen cells, anti-O sera-treated spleen cells, macrophage-depleted spleen cells of C57BL/6J mice and cortisone-treated thymocytes of C57BL/6J mice. It was also shown that these cell walls were mitogenic on spleen cells and macrophage-depleted spleen cells of congenitally athymic (nude) mice. The above results suggest that the cell walls investigated in this study act as mitogens on both thymus-derived lymphocytes (T-cells) and bone marrow-derived lymphocytes (B-cells).

Animals↗
PubMed1976

Immunotherapy of cancer with cell wall skeleton of Myocabacterium bovis-Bacillus Calmette-Guérin: experimental and clinical results.

Adjuvant and antitumor activities of CWS prepared from cells of mycobacteria, nocardia, and corynebacteria were examined. Oil-attached CWS of M. bovis BCG (BCG-CWS) stimulated the generation of cell-mediated cytotoxic effector cells in mice. Tumor growth was suppressed in mice inoculated intradermally with a mixture of oil-attached CWS and living tumor cells. Systemic and specific tumor immunity was demonstrated in mice in which tumor growth was suppressed. Tumor growth was also suppressed by oil-attached CWS of BCG or N. rubra in autochthonous autografts of spontaneous mammary adenocarcinoma and methylcholanthrene-induced fibrosarcoma in mice. The intravenous injection of oil-attached BCG-CWS prevents the appearance of lung cancer in rabbits by the instillation of chemical carcinogens. It was also shown that treatment with oil-attached BCG-CWS was able to elevate the immunologically depressed state of tumor-bearing mice to a normal level, as determined by a cell-mediated cytotoxicity assay that empolyed chromium release as the standard. Preliminary results suggest that oil-attached BCG-CWS is useful as an immunotherapeutic agent for both lung cancer and for malignant melanoma, leukemia, Hodgkin's disease, and other neoplastic diseases and that this agent operates without any significant complications.

Animals↗