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Biomedical subjects

K Miyoshi

Publications and source records attributed to K Miyoshi.

At least 253 records · Page 14Linked to original sources
PubMed1977

Neuronal lipofuscin in centrophenoxine treated rats.

The diminution of neuronal lipofuscin was studied in centrophenoxine adminstered animals. In fluorescent studies, as well as in ordinary histological methods, a marked decrease of the lipofuscin was observed in the cerebral cortex, hippocampus, thalamus, basal ganglia, midbrain, medulla oblongata and spinal cord. The lipofuscin in the cenntrophenoxine animals showed fine granular structures in the perikarua of the neurones when compared to that of control rats. Electronmicroscopically, electron density of the lipofusin structures was observed. Enlargement of the vacuolar portions of the lipofuscin was seen in the neurones of the dorsal ganglia in the centrophenoxine animals. In the present studies, the diminution of the lipofuscin in the neurones was well demonstrated with fluorecent and histological methods. The characteristic ultrastructural changes of the neuronal lipofuscin are reported.

Animals↗
PubMed1976

Mechanisms of electron transfer from sulfite to horseradish peroxidase-hydroperoxide compounds.

Using a rapid-scan spectrophotometer equipped with a stopped-flow apparatus, reactions of sulfite with compounds I and II of two horseradish peroxidase isoenzymes A and C were investigated. The direct two-electron reduction of peroxidase compound I by sulfite occurred at acidic pH but the mechanism gradually changed to the two-step reduction with the intermediate formation of compound II as the pH increased. The pH at which the one- and two-electron changes occurred at the same speed was 4.5 for peroxidase A and 7.7 for peroxidase C. A new peroxidase intermediate was found in the reaction between peroxidase compound II and sulfite. The sulfite compound showed a characteristic absorption band at 850 nm and the optical spectrum was similar to that of isoporphyrins but was quite different from that of sulfhemoproteins. The rate (k) of conversion from the sulfite-compound II complex to the sulfite compound was proportional to the concentration of H+ and the log k vs. pH plot for peroxidase A moved to the acidic side by 1.1 pH unit from that for peroxidase C.

Electron Transport↗
PubMed1975

Antithyroid antibodies in Alport's syndrome.

Two families in which more than two members had Alport's syndrome were examined. Serum-antithyroid-antibodies were found in all those with Alport's syndrome and some of their relatives. These included three cases of Alport's syndrome with nephritis and/or nerve deafness and two normal people who can be regarded as carriers of Alport's syndrome from one family, and one case of the syndrome with nephritis and deafness from the other family. One case of Alport's syndrome had symptoms of hypothyroidism, and biopsy specimens from another case were characteristic of chronic thyroiditis. The results indicate that serum-anti-thyroidantibodies, together with nephritis and deafness, are a sign of Alport's syndrome. The results accord with transmission of the syndrome as an autosomal dominant trait and suggest that Alport's syndrome may be caused by an immunological abnormality.

Adolescent↗