Biomedical subjects
Publications and source records attributed to Y Kotake.
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A new pathway of NAD+ synthesis from anthranilic acid was found in the livers of rats. Starting from [carboxyl-14C]anthranilic acid, radioactive NAD+ and NADP+ were produced as judged by Dowex-1 X 8-formate column chromatography followed by radiochromatography. Several intermediate compounds, such as quinolinic acid, nicotinic acid mononucleotide, and nicotinic acid adenine dinucleotide were also identified with the aid of various chromatographic techniques. In the experiments with liver microsomal hydroxylation systems, anthranilic acid was converted into not only 5-hydroxyanthranilic acid but also 3-hydroxyanthranilic acid.
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Germfree and conventional rats were used to investigate the influence of gut microflora upon vitamin B-6 deficiency. The body weights of conventional rats fed a vitamin B-6-deficient diet for more than 5 weeks plateaued, but the rats remained alive until the end of week 9 of deficiency. The body weights of germfree rats fed the same deficient diet decreased, andmost of rats were moribund around the end of week 9 of deficiency; three died. Urinary xanthurenic acid excretion following tryptophan load continued to rise at each experimental week in deficient germfree rats, while such a progressive increase in the level of the excretion was not observed in deficient conventional rats. Autopsy revealed that some of deficient germfree rats suffered from partial or toal lunficient conventional rats. The lung atelectasis was presumed to be the result of the respiratory muscle insufficiency which was closely related to the changes of the peripheral nerves innervating these muscles. The results may suggest that the presence of gut microflora made some contribution to improvement of the vitamin B-6 deficiency.
An equimolar mixture of a xanthurenic acid-insulin complex and ZnSO4 was separated into an insulin peak and a peak containing xanthurenic acid (XA) and Zn by Sephadex G-75 column chromatograpy. XA and di-[L-histidino]-zinc (II) readily combined to produce di-[L-histidino]-di-xanthurenato zinc (II) (His2-Zn2+-XA2). By increase in the concentration of Zn2+ ions, XA was removed from di-[L-histidino]-di-xanthurenato zinc (II) (His2-Zn2+-XA2) as XA-Zn2+. The XA-insulin complex showed dcreased relative intensity of fluorescence compared with the Zn-insulin when excited at a wavelength of 284 nm. The difference spectrum between native Zn-insulin and XA-insulin complexes showed a slight red shift. A diffference in the CD spectrum between native Zn-insulin and XA-insulin complexes was observed.
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Inlying tracheal "stay sutures" and submandibular sutures to prevent cervical hyperextension were used separately and in concert to limit anastomotic tension following tracheal resection in puppies. Study of the degrees of stenosis in the mature dogs indicates the effectiveness of the principle.
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The xanthurenic acid-insulin complex was found to have similar immunological properties to native Zn-insulin. This complex showed less hormonal activity on glucose metabolism in adipose tissue than native An-insulin, but its activity was increased by addition of Zn2+ ions.
The distribution of thymic tissue at the anterior mediastinum was examined histologically in 18 cases following the removal of the adipose tissue which was located outside the thymic capsule at the time of thymectomy for myasthenia gravis. The gross adipose tissue revealed the presence of histological thymic tissue, including Hassall's bodies, in 13 of 18 cases. In order to be sure of extirpating all of the thymic tissue, the adipose tissue at the anterior mediastinum as well as the gross thymus should be removed.
1) Xanthurenic acid-insulin complex reduced insulin activity. 2) The antigenicity of xanthurenic acid-insulin was almost same as native insulin. 3) Saturated fat increased urinary xanthurenic acid in vitamin B6 deficiency.
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Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.