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Biomedical subjects

S Goto

Publications and source records attributed to S Goto.

At least 865 records · Page 48Linked to original sources
PubMed1987

The distribution of GABA and glycine response in the mouse brain using Xenopus oocytes.

Injection of mRNA from different regions of the central nervous system (CNS) of the mouse into the Xenopus oocyte caused a difference in the relative glycine to gamma-aminobutyric acid (GABA) response of the oocyte. Glycine caused the response in oocytes injected with brainstem mRNA but hardly in oocytes injected with cerebrum mRNA and in oocytes injected with cerebellum mRNA. In contrast, GABA caused the response in oocytes injected with mRNA from each of the 3 parts of the CNS. These obvious regional differences may reflect the distribution of the receptors to each plausible neurotransmitter in the CNS.

Animals↗
PubMed1987

[Insulin binding to erythrocytes in chronic glucocorticoid deficiency--investigation before and during replacement therapy].

The effect of chronic glucocorticoid deficiency on insulin binding to erythrocyte was evaluated in 2 cases of ACTH deficiency, 2 of Sheehan's syndrome and a case of Addison's disease before and after the replacement therapy with cortisone acetate. 75 gram oral glucose tolerance test (OGTT) was also performed. Mean fasting plasma glucose (FPG) and insulin (FIRI) before (70.2 mg/dl, 3.6 microU/ml) and after (75.4 mg/dl, 7.8 microU/ml) therapy were significantly lower than those in normal control (97.0 mg/dl, 12.0 microU/ml). The ratio of FIRI/FPG before and after treatment were also significantly lower than that in control subjects. Glucose areas during OGTT before and after treatment were not different from that in control subjects. However, insulin area before treatment was significantly lower than that in control group. There were significant increases in FIRI/FPG and insulin area, but not in FPG and glucose area before and after treatment. Insulin binding to erythrocytes before treatment (11.9 +/- 1.1%, mean +/- SD) was greater than that in normal subjects (7.7 +/- 1.9%, n = 19, p less than 0.05). It was significantly decreased and normalized to 7.8 +/- 2.0% by the treatment. Analysis of binding parameters revealed the increases in receptor concentration at high affinity site (R1) and in average affinity at empty site by average affinity profile (Ke) before treatment in comparison with control subjects. There was no significant difference in binding parameters after treatment and in control group. High R1 or low R2 observed before treatment was significantly decreased or increased after treatment, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)

Addison Disease↗
PubMed1987

Retention of anomeric form in lysozyme-catalyzed reaction.

A lysozyme-catalyzed reaction is initiated by a cleavage of the beta-1, 4-glucosaminide linkage, followed by hydration and transglycosylation. Since all glycosides produced by transglycosylation have beta-glycosidic linkages between the sugar and the acceptor moieties, the lysozyme-catalyzed reaction has been classified as an anomer-retention reaction. However, there is no experimental evidence on the anomer retention of the new reducing residue produced by the hydrolysis of the substrate. In the present study, an attempt was made to determine the anomeric form of the GlcNAc residue at the reducing end in nascent hydrolytic products. The anomeric forms of the enzymatic products were separated and quantitatively analyzed by high-performance liquid chromatography. The amounts of alpha- and beta-anomers in the product were plotted against the reaction time. Computer analysis of the experimental data indicated that the nascent hydrolytic product takes only the beta-anomeric form and that the alpha-anomer is formed from beta-anomer by mutarotation.

Acetylglucosamine↗
PubMed1987

Simultaneous determination of four active ingredients of dinocap in crops by high-performance liquid chromatography.

A procedure for high-performance liquid chromatographic (HPLC) determination of four active ingredients of dinocap, 2,4-dinitro-6-octylphenyl crotonate, 2,6-dinitro-4-octylphenyl crotonate, 2,4-dinitro-6-octylphenol and 2,6-dinitro-4-octylphenol, in crops was examined. The four compounds were extracted with acetone and re-extracted into hexane. After clean-up successively by hexane-acetonitrile partition and silica gel column chromatography, the compounds were determined by HPLC with an UV detector (245 nm). The column was Cosmosil 5C18 (ODS, 5 micron) and the eluent was methanol-water-acetic acid (330:70:1). The limit of detection was 0.02 ppm and the recoveries from crops (spiked with 0.5 ppm) were 85-100%. The four compounds were determined simultaneously and the method was shown to be applicable to residue analysis of these compounds in crops sprayed with dinocap.

Chromatography, High Pressure Liquid↗
PubMed1987

Influence of stable fixation on trabecular bone healing: a morphologic assessment in dogs.

The healing patterns of trabecular bone are different from those of compact bone. In order to investigate further this observation, a histomorphometric assessment was undertaken. The influence of internal fixation devices on trabecular bone healing was also studied. Intercondylar osteotomies were produced in 19 dogs and fixed with screws. All dogs were killed between 1 and 14 weeks; eight of them had the screws removed 4 weeks after osteotomy and were killed 4 or 10 weeks later. The results of morphometry were compared to the histologic and radiologic pictures. Anatomic reduction with stable fixation led to contact healing characterized by a narrow endosteal bone formation at the osteotomy site that disappeared only after union was complete (4 weeks). In gap healing, the endosteal bone formation was greater. Internal fixation devices appeared to cause a diffuse osteopenia once union was complete. Their removal just after completion of union seems to prevent the bone loss. Screws induced bone formation around their threads; after they were removed, the reaction disappeared but the screw holes were not filled with normal trabeculae 10 weeks later. Union of fractures through trabecular bone can be assessed radiologically. A decrease of band-like bone density at the fracture site indicates completion of union. This is the optimal time for implant removal. It prevents the osteopenia observed in cases of continuous presence of screws.

Animals↗
PubMed1987

Effect of exposure to carbon disulfide on tryptophan metabolism and the tissue vitamin B6 contents of rats.

Female Wistar rats were exposed to 100 ppm or 600 ppm carbon disulfide for 6 hours a day, 5 days a week for 12 weeks. During the exposure period, their urinary excretion of 4-pyridoxic acid was determined. The urinary excretions of xanthurenic acid and kynurenic acid after tryptophan loading were also determined. At the end of the exposure period, the rats were sacrificed and the levels of the five major forms of vitamin B6, pyridoxine, pyridoxal, pyridoxamine, pyridoxal phosphate and pyridoxamine phosphate, in the liver, kidneys and brain were determined by HPLC fluorometry. During the exposure the urinary excretions of xanthurenic acid and kynurenic acid after i.p. administration of tryptophan increased significantly in both experimental groups. However, urinary excretion of 4-pyridoxic acid decreased only slightly in the group exposed to carbon disulfide at 600 ppm and did not decrease in the group exposed to 100 ppm carbon disulfide. Furthermore, no significant changes were observed in the contents of vitamins B6 in any tissues examined. These results indicate that carbon disulfide does not cause vitamin B6 deficiency and thus that the disorders of tryptophan metabolism induced by carbon disulfide intoxication are not due to vitamin B6 deficiency.

Animals↗
PubMed1987

Isolated unilateral absence of left pulmonary artery with peribronchial arteriovenous malformation showing recurrent hemoptysis.

Unilateral absence of a pulmonary artery is an uncommon condition and usually complicated by a cardiac anomaly. Our case is a rare one who showed the absence of the left pulmonary artery with left aortic arch and without cardiac anomaly. He suffered from recurrent hemoptysis and pneumonia since he was 9 months old. Angiography revealed peribronchial arteriovenous malformation of the affected lung which was supplied from subclavicular arteries and bronchial arteries. Although he was treated by operative ligation and angiographic embolotherapy of the supplying systemic arteries, the repeated the attacks of massive hemoptysis and necessiated left pneumonectomy at 10 years of age.

Arteriovenous Malformations↗
PubMed1987

Changes in lower esophageal sphincter pressure (LES) after Stamm gastrostomy.

Previous clinical and experimental reports have implicated placement of a Stamm gastrostomy (SG) as a cause of gastroesophageal reflux (GER) in children. This study evaluates this problem by measuring alterations in the lower esophageal sphincter pressure (LES) after SG with and without maintenance of the esophagogastric angle of Hiss. In 20 cats (2.8-3.2 kg) general anesthesia was induced using 20 mg/kg ketamine im. Esophageal manometrics were measured using a continuous perfusion catheter and recording system, evaluating three measurements for each animal. Eight cats (Group I) underwent SG placement in the anterior stomach wall two-thirds of the way down from the fundus. This was tacked to the anterior abdominal wall 3 cm lateral to the midline at the appropriate level. Six cats (Group II) had standard SG tube placement and in addition, two interrupted sutures were placed between the fundus and the esophagus maintaining the gastroesophageal angle of Hiss. Six cats (Group III) had sham laparotomy. After awakening, the animals were fed cat chow and water ad libitum. At 7 and 14 days, the animals were reanesthetized with ketamine and manometrics were repeated. Preoperative LES pressure measured 11.3 +/- 4.7 Torr. LES pressure in Group I decreased to 6.61 +/- 1.6 Torr at 7 days (P less than 0.01) and 4.8 +/- 1.6 Torr at 14 days postoperatively (P less than 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1987

Brain-specific small RNA during development and ageing of mice.

The ID sequence is a repetitive sequence family of rodent species that is transcribed specifically as small RNA in the brain. The amount of brain-specific small RNA in mice was shown to increase greatly in the first month after birth and then to remain unchanged until senescence. This RNA was suggested to be involved in regulation of brain-specific gene expression during postnatal development.

Aging↗
PubMed1987

Age-associated accumulation of heat-labile aminoacyl-tRNA synthetases in mice and rats.

Age-related changes of two aminoacyl-tRNA synthetases in BDF1 mouse and Fischer 344 rat tissues were investigated. The proportions of heat-labile enzymes in the brain and liver were 5 to 10% in young animals, but 25 to 40% in old animals. The proportions began to increase markedly with increase in the mortality rate of the animals. Significant correlations were found between the proportions of heat-labile tyrosyl- and leucyl-tRNA synthetases in the brain and liver of individual animals. Moreover, the proportions of the heat-labile enzymes in the brain were also significantly correlated with those in the liver. Thus, it appears that when one enzyme is heat-labile in one tissue other enzymes are also heat-labile in the same tissue and the same enzyme is also heat-labile in other tissues. Analysis of the size-distribution of partially purified leucyl-tRNA synthetase complexes indicated that, while enzyme preparations from young animals tended to consist of complexes of larger sizes, those from older animals contained smaller complexes, a 10S complex being a major component. On heating preparations from old animals, the activity in the 10S peak disappeared most rapidly. This finding suggests that the heat-stability of the enzyme depended on its molecular form.

Aging↗
PubMed1987

Conservation of the ID sequence and its expression as small RNA in rodent brains: analysis with cDNA for mouse brain-specific small RNA.

Two cDNA clones for mouse brain-specific small RNA were isolated, whose sequences turn out to be highly homologous to that of a genomic mouse ID-like clone isolated previously. By use of one of these cDNA clones as a probe, the copy numbers of ID-related sequences in several mammalian species were determined. The ID sequence was found to be conserved in mice, rats, hamsters and guinea pigs, but not in non-rodent species. There were about 3 orders of magnitude of difference in the copy numbers of the gene, i.e. rat 4.0 X 10(4), mouse 4.5 X 10(2), hamster 1.5 X 10(2), and guinea pig less than 50. The gene was transcribed as small RNA in the brain of rodent species. The relative concentration of small RNA in the brain was roughly proportional to the copy number of the ID sequence in mice, hamsters, and probably in guinea pigs also. On the other hand, the amount of the RNA in rat brain was much less than that expected from the large copy number of the gene. On the basis of these observations, the possibility is discussed that most of the ID sequences in the rat are pseudogenes.

Animals↗
PubMed1987

Morphological characterization of the rat striatal neurons expressing calcineurin immunoreactivity.

Calcineurin, a multifunctional Ca2+ (divalent cations)-dependent calmodulin-stimulated phosphoprotein phosphatase, has been reported to be present in the striatal neurons which project to the globus pallidus and the substantia nigra. In the present study, we examined what types of cells in the rat striatum express calcineurin. The calcineurin-positive neurons were of medium size (mean diameter of 16 microns) and constituted about 60-70% of the total neuronal population in the striatum. Under light microscopy, the calcineurin-positive neurons had round, triangular, or polygonal cell bodies with a relatively small amount of cytoplasm. Electron microscopic examination of 20 randomly selected striatal calcineurin-immunoreactive neurons revealed that their nuclei did not show any invaginations or intranuclear inclusions. The calcineurin-positive neurons were characterized by Golgi impregnation as the densely spinous type. On the other hand, it was demonstrated that calcineurin-positive neurons are a separate population from the diisopropylfluorophosphate-acetylcholinesterase-positive cells or nicotinamide adenine dinucleotide phosphate diaphorase-positive cells, by means of the combination of immunocytochemistry and enzyme histochemistry. In addition, simultaneous localization of calcineurin and substance P in a single cell was observed in some striatal neurons using a double immunostaining method. On the basis of these findings, it was considered that most calcineurin-immunoreactive neurons in the rat striatum may be classified as medium-size densely spiny neurons.

Acetylcholinesterase↗
PubMed1987

Reduction of lower esophageal sphincter pressure with Stamm gastrostomy.

Although recent clinical studies suggest an association between Stamm gastrostomy and gastroesophageal reflux (GER), no significant experimental data is available. This study evaluates alterations in lower esophageal sphincter (LES) pressure after Stamm gastrostomy in cats. Eight male cats (average weight 3 to 4 kg) were induced under general anesthesia using 20/mg/kg ketamine intramuscularly (IM). Esophageal manometrics were determined for each animal using a continuous perfusion catheter and recording system. Three measurements were taken for each animal. Stamm gastrostomy was then placed in the anterior wall of the stomach two thirds of the way down from the fundus. This was tacked to the anterior abdominal wall 3.0 cm lateral to the midline at the appropriate longitudinal level. Esophageal manometry was repeated after abdominal closure. The animals were awakened and returned to their cages for ad libidum feedings. The animals were reanesthetized with ketamine and manometrics repeated at 7 and 14 days. Each animal served as its own control. Five animals underwent barium esophagram 14 days postoperatively to evaluate for GER. Preoperative mean LES pressure measured 11.4 +/- 3.5 torr. This decreased to 7.8 +/- 2.8 torr immediately after Stamm gastrostomy (P less than .025). When evaluated at 1 and 2 weeks after gastrostomy, further decrease in LES pressures to 6.6 +/- 1.6 torr and 4.8 +/- 1.6 was observed (P less than .02 v preoperative). Three of five cats undergoing barium swallow demonstrated significant reflux radiographically. Stamm gastrostomy caused significant reduction of the LES pressure in all cats studied. This resulted in clinical GER as documented by barium swallow in three of five cats.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1987

Is preserving the entire aganglionic colon reasonable in the surgical treatment of total colonic aganglionosis?

Clinical reports describe an increased incidence of severe enterocolitis in infants with total colonic aganglionosis (TCA) following the Martin extended Duhamel procedure using the entire aganglionic colon. This study evaluates the efficacy of this procedure in an experimental model of TCA in comparison with an antimesenteric aganglionic colon patch in rats. TCA was produced by serosal application of 0.1% benzalkonium chloride in 18 Sprague-Dawley rats (250 g). Five additional rats served as operated controls. Ileoanal pull-through was performed in 18 TCA rats, in conjunction with the Martin extended Duhamel procedure using the entire colon in six rats, with an aganglionic colon patch in nine (using the right [3 rats], transverse [3 rats] and left [3 rats] colon), and without other procedures in three rats. Animals were evaluated for survival, weight change, food intake, stool consistency and volume, barium enema, complete blood cell count (CBC), total protein, and serum electrolytes at 4 and 12 weeks. Survival was 83% (5/6) rats with the Martin procedure, 100% in the nine rats with various colon patches, zero in three rats with ileoanal pull-through alone, and 100% in controls. Rats with the Martin procedure gained 2.2 +/- 3.27% of preoperative weight, while controls gained 11.2 +/- 0.52% at 4 weeks. All other rats showed an early weight loss. At 12 weeks, right and transverse colon patched rats had weight gain. Blood count and laboratory studies were similar in each group. Barium enema showed rapid transit in rats with ileoanal pull-through, and slower transit in rats with colon patches or the Martin procedure.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1987

Chemically induced bowel denervation improves survival in short bowel syndrome.

This study evaluates the effect of chemically induced bowel denervation on survival, weight gain or loss, transit time, and d-xylose absorption in rats following 80% small bowel resection. Forty-three male Sprague-Dawley rats (150 g) underwent 80% midsmall bowel resection and anastomosis. Twenty rats were short bowel controls (group I). In 23 rats (group II), a 2.0 cm segment of jejunum proximal to the anastomosis was denervated by application of 0.1% benzalkonium chloride (BK) for 30 minutes. Ten additional rats underwent sham laparotomy without bowel resection. Five remained untreated (group III) and in 5 (BK) denervation was added (group IV). Bowel denervation was confirmed by histologic study in all (BK) rats. Weight and daily food and water intake were measured for 30 days and the groups compared. Weight in group I was 43.8 +/- 52.9 g, group II 95.0 +/- 50.1, (P less than .005), group III 177 g, and group IV 175 g. Food intake was greater in group I than II (P less than .05) and was similar to groups III and IV. Water intake calculated as animal weight (g)/mL H2O ingested was lowest in group I (P less than .05). Mortality was 30% in group I (6/20) and only 8.6% in group II (2/23). No deaths were observed in unresected controls (III and IV). Twenty-four additional rats were evaluated for d-xylose absorption and transit time by bringing out a loop enterostomy 10.0 cm from the Ligament of Treitz. Twelve rats were ostomy controls (group V).(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1987

Hepatic resection for hepatocellular carcinoma. Clinical features and long-term prognosis.

Ninety-eight hepatic resections for hepatocellular carcinoma were performed on 94 patients from 1963-1985. HBs antigen was positive in 17% of patients, preoperative serum alpha-fetoprotein was more than 20 ng/mL in 70% of patients, and liver cirrhosis was present in 75% of patients. Hospital mortality rate was 19%, and the volume of operative blood loss was the most decisive factor that affected the short-term prognosis. Excluding the 19 hospital deaths, the long-term survival rates of 75 patients were 73%, 42%, and 25% for 1, 3, and 5 years, respectively. Prognostic factors that influenced the long-term prognosis were investigated by comparing the survival curves. Significant differences of survival patterns were noted when analyzed on the basis of preoperative alpha-fetoprotein level (less than or equal to 200 vs. greater than 200 ng/mL), tumor size (less than or equal to 5 vs. greater than 5 cm), and tumor capsule. The recurrence of carcinoma was the main cause of death in 56% (42 patients) who died after discharge from the hospital. The development of effective prevention and treatment against recurrent tumors is necessary to improve long-term prognosis.

Adult↗
PubMed1987

Angiographic difference in coronary artery of man, dog, pig, and monkey.

Comparative morphological studies on the coronary arteries of the left ventricular free wall were carried out on human, dog, pig, and monkey hearts by using postmortem coronary arteriography, soft X-ray photograms, and the clearing method. The results showed that the types of coronary arteries (types I, II, and III) and connecting portion of anastomotic vessels in the pig and monkey hearts closely resembled those in man. Whereas the dog hearts showed the following characteristics: numerous Type III vessels and anastomoses in the epicardial layer, the existence of only the left predominant type of coronary artery, and the supply of blood to the papillary muscles of the left ventricle mostly through a single branch of the coronary artery. Therefore, it is necessary to take into consideration the basic difference in the structure of the coronary arteries of human and dog hearts, when dogs are used experimentally for research of human ischemic heart disease. The fact that only the papillary muscles of the human heart-compared to animal hearts-are supplied blood from two sources may be advantageous to rescue the papillary muscles from ischemic necrosis.

Adolescent↗