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Biomedical subjects

T Matsui

Publications and source records attributed to T Matsui.

At least 1,027 records · Page 57Linked to original sources

Effect of peptide extracted from skeletal muscles of the fur seal on periodontal diseases.

It has been confirmed previously that a physiologically active peptide extracted from the skeletal muscles of fur seals exhibits excellent dermal absorption and has peripheral vasodilating properties. These properties were postulated to be beneficial to inflamed periodontal tissues. To test this, a dentifrice containing the peptide was prepared and utilized in a double-blind test. Significant improvement in the gingiva conditions was observed when a 0.1% or more concentration of peptide was used. As time progressed, distinct clinical improvement in redness, swelling, drainage, bleeding and pocket depth was noted. No significant side effects were noted although there were seen increased salivation and gingival blanching. It is believed, as a result of this and other studies, that the clinical efficacy of this peptide is due to its vasodilating action on the venules, thus reducing the internal pressure in the vascular beds.

Adolescent↗

[Concentration of cefotiam in the human bone marrow fluid and bone tissue (author's transl)].

The preoperative administration of cefotiam (CTM) 1 g by intravenous drip infusion for 30 minutes was performed. And the concentration of CTM in peripheral blood, bone marrow fluid and bone tissue was investigated. CTM was smoothly transmigrated from blood to bone tissue, and kept on the concentration in bone tissue over MIC values for several hours. These preliminary results encourage us to think that CTM may be as useful in prophylaxis against postoperative infections.

Adult↗

[Relationship between focal cerebral ischemia and cerebral water content (author's transl)].

The correlation between the local cerebral blood flow (lCBF) and the specific gravity (SG) of the topographically corresponding cortical area was examined using a model of regional cerebral ischemia by means of transorbital occlusion of the middle cerebral artery (MCA) in cats. Cats were divided into the following experimental groups. Group A: two hours MCA occlusion followed by two hours recirculation; Group B: two hours MCA occlusion; Group C: four hours MCA occlusion. The lCBF and the SG were measured by the use of hydrogen clearance method and gradient column, respectively. Two hours MCA occlusion resulted in a moderate drop in SG in the cortical areas where the lCBF decreased below 20 ml/100g/min during ischemia (Group B). Four hours MCA occlusion in Group C resulted in a similar drop in SG. Two hours recirculation following two hours MCA occlusion in Group A, however, caused a remarkable drop in SG which was significantly greater than those in Group B and C. There was no correlation between the drop in SG and the level of post-ischemia lCBF (reactive hyperemia) in Group A. Thus, the present study revealed i) that the development of cerebral edema as evidenced by the drop in cortical SG was associated with an extreme reduction in lCBF, ii) that recirculation exerted a detrimental influence on the post-ischemic brain injury and iii) that the edema aggravation during recirculation was not necessarily dependent on the magnitude of reactive hyperemia. Based on the above results, it was suggested that the cause of edema aggravation following recirculation, namely the development of vasogenic edema, might reside in some chemical mechanism such as lipid peroxidation.

Animals↗

[Concentration of dibekacin sulfate in bone (author's transl)].

The concentrations in serum, cancellous and cortical bones of dibekacin sulfate were measured in 16 cases. Dibekacin sulfate rapidly penetrates into bone. The peak concentration in serum and cancellous bone is reached within 1 hour after intramuscular injection and the concentration in cancellous bone parallels that in serum. The concentration in cortical bone increases with time. Cancellous bone has higher concentration than cortical bone. Dibekacin sulfate is suitable for prevention of infection in orthopaedic surgery, because it maintains a bactericidal level in bone for enough time.

Adult↗

Carcinoma in situ of the vermiform appendix associated with adenomatosis of the colon.

A case is reported of carcinoma in situ of the vermiform appendix associated with adenomatosis of the colon. Histologic examination revealed the presence of tubulovillous adenocarcinoma in an adenoma. Other lesions associated with this neoplasm were multiple adenomatous polyps in the colon and duodenum and two fibromas in the neck. Since the vermiform appendix is a part of the large intestine, it should be expected that careful examination may reveal the adenomatous involvement and may lead to the discovery of carcinoma in situ.

Adenocarcinoma↗

Developmental changes in the collagens and some collagenolytic activities in bovine dental pulps.

Collagen concentration was fairly low in young bovine 3rd premolar pulps, about 9 per cent by dry weight of pulp in stage I, but it increased consistently up to more than 25 per cent at stage V as the pulp matured. The ratio of type III to type I collagen similarly increased from 13 per cent at stage I to 32 per cent at stage V. Both collagenase and possibly collagenolytic neutral peptidases showed significantly high activity in the early stage of pulp development where the rate of collagen synthesis was also elevated. Higher rates of both collagen synthesis and its degradation might explain the low concentration and content in the early stage of pulp development.

Aging↗

Mechanism of regulation of human epidermal transglutaminase.

The activity of crude human epidermal transglutaminase was enhanced remarkably following 24 hr preincubation at low pH (pH 4.5), whereas the pure human epidermal transglutaminase did not show enhancement of enzyme activity at low pHs. Preincubation of pure transglutaminase with rat liver lysosomal fractions (100 microgram/ml) caused a time-dependent enhancement of activity at pH 4.5, up to 4.5 times of the initial activity. This enhancement was specific for lysosomal fractions among the several rat liver subcellular fractions tested. The activity of purified transglutaminase stimulated by lysosomal fractions was inhibited by pepstatin (50 microgram/ml), chymostatin (50 microgram/ml) and EDTA (1 mM). Preincubation of purified transglutaminase with 5 to 100 microgram/ml cathepsin D caused a time-dependent enhancement of activity up to 9.5-fold over control. This enhancement was specific for cathepsin D among the several lysosomal enzymes tested. These in vitro observations suggest possible activation mechanisms of epidermal transglutaminase in vivo. Epidermal transglutaminase may be activated by lysosomal acid proteinases, such as cathepsin B1 and cathepsin D, which are released and activated during the autolytic stages in granular layer in epidermis.

Animals↗