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Biomedical subjects

H Etoh

Publications and source records attributed to H Etoh.

At least 55 records · Page 3Linked to original sources
PubMed1991

Influence of liver damage on antipyrine metabolite formation in rats.

1. The effects of three types of liver damage induced by carbon tetrachloride (CCl4), D-galactosamine (Ga1N) and alpha-naphthylisothiocyanate (ANIT) on antipyrine (AP) metabolism was studied in rats. 2. The serum half-life (t1/2) of AP (50 mg/kg, i.p.) was increased and total body clearance (CL) decreased in all three types of liver damage; the apparent volume of distribution (Vd) was relatively unchanged. 3. Rates of formation of AP metabolites (CLm) were lower than those in the control group in all three types of liver damage. 4. Rates of urinary excretion (% dose) of AP metabolites, 3-hydroxymethylantipyrine (HMA) and 3-hydroxymethyl-3-norantipyrine (NORA) were decreased in all three types of liver damage. However, the rate for 4-hydroxyantipyrine (OHA) was lower only in the Ga1N-treated rats. 5. The percentage conjugation of HMA was higher in the ANIT-treated rats than in the control group, and percentage conjugation of NOR was lower only in the Ga1N-treated rats. 6. These results indicate that the pathways of oxidation and conjugation of AP metabolism are not affected to the same extents by different types of liver damage.

1-Naphthylisothiocyanate↗
PubMed1988

Fibroblasts of two patients with trisomy 18 show 1.5-fold increase in peptidase A activity over normal human diploid fibroblasts.

Peptidase A (Pep A) activity assigned to chromosome 18q23 was biochemically examined in fibroblasts cultured from two patients with trisomy 18 and in fibroblasts derived from normal individuals. The trisomy 18 fibroblasts showed approximately a 1.5-fold increase in Pep A activity over that of the control fibroblasts. Agar gel electrophoretic analysis revealed no detectable differences in the electrophoretic mobility and isoenzyme patterns of Pep A between the trisomy 18 fibroblasts and normal ones. The present results show the trisomy 18 fibroblasts to be suitable for study of the gene dosage effect of Pep A.

Aspartic Acid Endopeptidases↗
PubMed1984

A case of sicca syndrome due to primary amyloidosis.

We report the rare occurrence of sicca syndrome associated with primary amyloidosis. A 63-year-old man with apparent keratoconjunctivitis sicca and xerostomia died of the cardiac failure. Neither sialography nor labial gland biopsy revealed findings compatible with Sjögren's syndrome. Macroglobulinemia and a positive Bence-Jones protein were noted in urine testing. Amyloid deposition was demonstrated by Congo red staining on biopsied rectal tissues, and by typical birefringence under polarized light microscopy. At autopsy, the amyloid deposition was identified histochemically in the submandibular gland and the minor salivary glands of oral cavity.

Amyloidosis↗
PubMed1983

X-ray-induced dicentric yields in lymphocytes of the teleost, Umbra limi.

A microculture technique was applied to the study of lymphocytes of Umbra limi, which have a low number of large meta- and submetacentric chromosomes (2n = 22). On the 5th day (90h) and later after initiation of culture at 20 degrees C, some cultures provided well spread metaphase chromosomes for analyses. After initiation, cultures were irradiated with 50, 100, 150 and 200 R of 200 kVp X-rays. The cultures were harvested on the 5th day, at which time all arrested metaphase chromosomes were in their first division. The dicentric yields induced in X-irradiated Umbra lymphocytes were observed to be significantly (P = 0.05) lower than those in human lymphocytes. The resulting dose-response relationship for dicentric yield was described by the quadratic equation Y = aD + bD2. The advantage of this method lies in the fact that small amounts (0.1 ml) of blood can be repeatedly withdrawn from the fish after a minimal interval of 2 weeks. The microculture technique with Umbra lymphocytes is thought to have a wide range of applications in studies of the potential genotoxic effects of clastogenic agents in the aquatic environment.

Animals↗
PubMed1983

Incidence of chromatoblastomas in aging goldfish (Carassius auratus).

The incidence of chromatoblastomas in aging goldfish, Carassius auratus, was observed for 2 successive years. Tumors first appeared in fish at 5 years of age, and the tumor frequency increased with increasing age of the fish. The cumulative incidence rate of chromatoblastomas and the mean number of tumors per fish were estimated for each age. The mean number of tumors per fish fitted a straight line with a slope of approximately 3 on a double logarithmic graph against age. Thus tumor incidence seemed proportional to about the third power of age, and tumor appearance seemed dependent on some mutational events.

Aging↗
PubMed1983

Effects of tritiated water on germ cells in medaka embryos.

Embryos of medaka, Oryzias latipes, were exposed to tritiated water and 137Cs gamma rays continuously from the one-cell stage until hatching (10 days at 26 degrees C). Germ cells in the gonads of newly hatched fry were counted in histological sections and compared with controls. The accumulated dose for 50% survival of germ cells was 195 rad for tritium beta rays and 350 rad for 137Cs gamma rays. Female progeny were produced using Yamamoto's method. The 50% survival doses for female germ cells treated in a manner similar to that described above were 140 rad for beta rays and 305 rad for gamma rays. When embryos of medaka were irradiated with gamma rays below an accumulated dose of 475 rad or treated with tritiated water at a concentration of 0.2 mCi/ml or lower, the dose response of the germ cells showed an exponential relationship. It appeared that there was no threshold or significant dose-rate effect for either beta or gamma rays on germ cell survival, and that tritium beta rays were more effective than 137Cs gamma rays in germ cell killing.

Animals↗