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Biomedical subjects

Y Miyake

Publications and source records attributed to Y Miyake.

At least 325 records · Page 18Linked to original sources
PubMed1992

A comparative study of development and symptoms among disintegrative psychosis and infantile autism with and without speech loss.

To investigate clinical pictures and the validity of disintegrative psychosis (DP) as defined in ICD-9, 18 cases of DP were compared with 51 and 145 cases of infantile autism (IA) with and without speech loss, respectively, on clinical variables. The DP cases showed clearer regression after more satisfactory development than the IA cases with speech loss. Around age 7, about 4 years after regression, those with DP were significantly more severely retarded than those with IA, yet both were similar in autistic symptomatology. EEG abnormalities and mothers 30 or older at delivery were significantly more common in the histories of those with DP than of those with IA. DP may be linked with IA having speech loss with regression in mental development as a common denominator.

Autistic Disorder↗
PubMed1992

Modulation of active renin secretion by renin-binding protein (RnBP) in mouse pituitary AtT-20 cells transfected with human renin and RnBP cDNAs.

To investigate the role of renin-binding protein (RnBP) in renin metabolism, RnBP expression plasmid, which was constructed to express human RnBP under the control of mouse mammary tumor virus long terminal repeat, was transfected into mouse pituitary AtT-20 cells together with the expression plasmid encoding human renin. The transfectant secreted prorenin and active renin, whereas RnBP was expressed only in the presence of dexamethasone and without secretion into the medium. The secretion of active renin was stimulated by forskolin, and the stimulation was repressed by dexamethasone. The secretion of prorenin, however, was insensitive to forskolin irrespective of the presence or absence of dexamethasone. Moreover, the forskolin-stimulated release of active renin was hardly repressed by dexamethasone in AtT-20 cells transfected with the renin expression plasmid and a selectable plasmid pMAMneo. Coexistence of RnBP and renin mRNAs in human Wilms' tumor G-401 cells was shown by means of polymerase chain reaction of respective cDNAs from the cells. These results suggest that RnBP modulates the release of active renin in renin-producing cells.

Animals↗
PubMed1992

mGK-6-derived true tissue kallikrein is synthesized, processed, and targeted through a regulated secretory pathway in mouse pituitary AtT-20 cells.

mGK-6-derived true tissue kallikrein was shown to be synthesized in mouse pituitary AtT-20 cells. This cell line, which is capable of processing other prohormones, only partially processed the proform of kallikrein to its active form, secreting it predominantly as the proform. The secretion of the active form was stimulated in response to a secretagogue, 8-bromo-cyclic AMP. These results imply that not only cellular elements capable of directing the processing of the proform to the active form and the intracellular transport of the kallikrein, but also a pathway that regulates the release of the active form may be present in the AtT-20 cells, thus the availability of this cell line for investigation of biosynthetic and secretory processes for tissue kallikrein in vivo being suggested.

8-Bromo Cyclic Adenosine Monophosphate↗
PubMed1992

Tissue-specific regulation of renin-binding protein gene expression in rats.

Rat gene for renin-binding protein (RnBP) was shown to be expressed in the kidney, adrenal gland, brain, lung, spleen, ovary, testis, and heart. On sodium depletion and captopril administration, the rat showed a marked increase in the adrenal RnBP mRNA level and a slight decrease in the kidney RnBP mRNA level. In two-kidney, one clip hypertensive rats, the RnBP mRNA levels of the clipped and contralateral kidneys were unchanged and also its adrenal mRNA level was maintained at the control level. The recombinant rat RnBP was synthesized in Escherichia coli cells and purified to apparent homogeneity. The RnBP existed as a homodimer and formed a heterodimer with rat renin to inhibit renin activity extensively. Intravenous injection of the RnBP into rats resulted in a rapid and strong inhibition of plasma renin activity, which persisted at least for 2 h. These results suggest that the expression of RnBP gene in the kidney and adrenal gland is regulated independently, and the function of RnBP is related to electrolyte homeostasis, probably through the interaction with renin.

Adrenal Glands↗
PubMed1992

Involvement of arachidonate cyclooxygenase products in bronchial hyperresponsiveness induced by subthreshold concentration of aerosolized thromboxane A2 analogue (STA2) in guinea pigs.

Effects of a thromboxane synthetase inhibitor (OKY-046) and a cyclooxygenase inhibitor (indomethacin) on bronchial hyperresponsiveness induced by subthreshold concentration of aerosolized thromboxane A2 analogue (STA2) were investigated in anesthetized, artificially ventilated guinea pigs in order to examine the role of the cyclooxygenase pathway in bronchial hyperresponsiveness. Pretreatment with aerosolized OKY-046 significantly inhibited the bronchial hyperresponsiveness to histamine, but pretreatment with intravenous indomethacin showed a tendency to potentiate bronchial hyperresponsiveness. These results suggest that subthreshold concentration of thromboxane A2 contributes to bronchial hyperresponsiveness through activating the cyclooxygenase pathway including thromboxane A2 synthesis, and that the released cyclooxygenase products have an inhibitory effect on the bronchial hyperresponsiveness in guinea pigs.

Aerosols↗
PubMed1992

A female patient with Lesch-Nyhan syndrome.

The authors report the second case of a female with typical Lesch-Nyhan syndrome. She exhibited athetoid movement, self-multilation, mental retardation and spasticity. Laboratory investigations revealed hyperuricaemia, hyperuricosuria and decreased erythrocyte hypoxanthine guanine phosphoribosyl transferase activity. She has normal female external genitalia and karyotype. Her parents are non-consanguineous and there is no family member with gout, nephropathy or any psychoneurological disorder. To prevent self-stimulation, it was necessary to fix the patient's upper extremities to the backrest of her wheelchair. The authors also describe an apparatus that limits elbow flexion.

Child↗
PubMed1992

Fundus albipunctatus associated with cone dystrophy.

We describe five unrelated patients in whom the typical signs of fundus albipunctatus were accompanied by colour vision defects, bull's eye or similar macular lesions, and severely diminished full-field cone electroretinograms indicating widespread damage to cones outside the macula. All patients had noticed night blindness from childhood. Signs of retinitis punctata albescens, a disease of similar appearance but with characteristics resembling retinitis pigmentosa, were absent. We cannot be sure whether these patients represent a process of fundus albipunctatus or a distinct disease entity or a casual combination of fundus albipunctatus and cone dystrophy.

Adult↗
PubMed1992

Effects of cefuzonam on peptidoglycan cross-linking reactions in gram-negative bacilli.

Cefuzonam [CZON, sodium (-)-(6R,7R)-7-[(Z)-2-(2-amino-4-thiazolyl)-2- methoxyiminoacetamido]-3-[(1,2,3-thiadiazol-5-yl)thiomethyl]-8-oxo -5-thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylate] is a newly developed semisynthetic cephem with a broad antibacterial spectrum. The effects of CZON on peptidoglycan cross-linking reactions were examined in Escherichia coli, Serratia marcescens and Pseudomonas aeruginosa. The cross-linking enzyme(s) from P. aeruginosa was the most susceptible to CZON, although the bacterium was resistant to CZON. CZON was active against S. marcescens in spite of its weak inhibitory activity against the enzyme(s) from the bacterium.

Cefazolin↗
PubMed1992

Simple method for measuring the antibiotic concentration required to kill adherent bacteria.

A simple method was developed for measuring the antibiotic susceptibility of bacteria adherent to plastic surfaces. Staphylococcus aureus cells adhered to the bottom of a 96-well plastic tissue culture plate were incubated in serially diluted antibiotic solutions. After a 24-hour-incubation the solutions were removed, and fresh medium without antibiotics was added to each well. The viability of the cells was judged by their growth after a further 24-hour-incubation. The antibiotic concentration required to kill adherent bacteria was far higher than that required for planktonic cells, although we used bactericidal drugs; beta-lactam, quinolone, and aminoglycoside antibiotics. The tolerance demonstrated by adherent cells is likely to play a role in the difficulties encountered in the chemotherapy of biofilm infections.

Anti-Bacterial Agents↗
PubMed1992

Siblings with normal LDL receptor activity and severe hypercholesterolemia.

We report about a brother and sister having clinical symptoms similar to those of homozygous familial hypercholesterolemia (FH) but surprisingly who have normal low density lipoprotein (LDL) receptor activities (M. Harada-Shiba et al, J Jpn Atheroscler Soc 1991; 19:227-242). The LDL receptor activities in the cultured fibroblasts of the patients were compared with those of FH heterozygotes and homozygotes for the LDL receptor mutation. The LDL receptor activities in the cultured fibroblasts of the patients were in the normal range, but their plasma cholesterol concentrations were similar to patients with homozygous FH. After the plasma LDL was removed by plasmapheresis in both patients, plasma cholesterol levels started to increase. The "rebound" of plasma cholesterol was compared with those for heterozygous and homozygous FH. The plasma cholesterol levels of the patients, which were greater than 410 mg/dl 2 weeks after plasmapheresis, were much higher than those of FH heterozygotes (232-311 mg/dl) but similar to those of FH homozygotes (345-464 mg/dl). The urinary mevalonate excretion rate, which reflects the rate of whole-body cholesterol synthesis, was higher for the brother (patient 1, 32.6 nmol/kg.day-1) than for the normal subjects (17.7 +/- 4.1 nmol/kg.day-1) but was similar to those of FH homozygotes (31.2 +/- 4.3 nmol/kg.day-1) and heterozygotes (29.8 +/- 10.9 nmol/kg.day-1). To estimate the catabolic and production rates of cholesterol in the brother, the time course for the increment in the total cholesterol level after plasmapheresis was analyzed by the two-compartment model.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed1992

Japanese Type A behavior pattern is associated with "typus melancholicus": a study from the sociocultural viewpoint.

An examination of the relationship between Type A behavior pattern (TABP) and "Typus Melancholicus" (TM) in 212 coronary heart disease (CHD) patients in Japan revealed that: CHD patients with TABP were significantly more likely to have a depression-prone personality, what Tellenbach calls "Typus Melancholicus"; this tendency was observed not only in CHD patients but also among healthy Type A subjects; and TM is positively correlated with Type A. The results of our studies from a comparative sociocultural viewpoint indicate that TM may be involved in Japanese TABP, suggesting the possibility that driving, self-sacrificing and obsessional traits are related to Type A behavior in a variety of different cultural contexts.

Adult↗
PubMed1992

Entrainment to external Ca2+ oscillation in ionophore-treated Physarum plasmodium.

To elucidate the mechanism of mutual interaction between intracellular chemical rhythms in the Physarum plasmodium, external Ca2+ oscillation was applied to the ionophore-treated plasmodial strand and its response was measured as tension oscillation. (i) Tension oscillation is entrained and phase locked to the externally applied Ca2+ oscillation. (ii) Two kinds of stable phase relationship, in-phasic and anti-phasic ones, are observed between them. (iii) Transition between the two stable phase relationships is also observed. These results suggest that intracellular rhythms with control tension generation are mutually entrained by means of cytosolic Ca2+ oscillation in the organism and that their interactions have two kinds of stable phase relationships.

Animals↗
PubMed1992

[Effects of ifenprodil on the adenosine triphosphatase of guinea pig liver mitochondria].

The effects of ifenprodil on adenosine triphosphatase (ATPase) activity were examined using guinea pig liver mitochondria. 1) Intact mitochondrial ATPase activity was stimulated by ifenprodil in a concentration-dependent manner, this effect being further potentiated with dinitrophenol. The stimulation by ifenprodil appeared with only ATP among four nucleotides as substrate. Mg2+ and Ca2+ attenuated the effect of ifenprodil. Ifenprodil abolished the KCN-induced inhibition. 2) Heat-treated mitochondrial ATPase activity, kept for 60 min at 50 degrees C, was decreased in a concentration-dependent manner by ifenprodil. The inhibitory effect of ifenprodil was abolished by Mg2+ and Ca2+. These results indicate that ifenprodil has two behaviors, acceleration of a latent ATPase and inhibition of an activated ATPase. These findings, together with our previous data, suggest that ifenprodil seems to affect the actions of Mg2+ and Ca2+ on mitochondrial ATPase by directly affecting the membrane, and these mechanisms may be involved in its anti-cyanide effect.

Adenosine Triphosphatases↗
PubMed1992

Cytogenetical and molecularbiological studies on a bovine XY female.

A bovine XY female in Holstein-Friesian heifer, which appeared as female with uterus and ovaries but did not show the estrus until 23 months old after the birth, was cytogenetically and molecularbiologically examined. As results of chromosome analysis, leucocyte and fibroblasts from skin, spleen and kidney examined had only metaphase plates with 60, XY. From these results and the clinical characteristics, this case was clearly diagnosed as a pure XY female. It was ascertained that the two genes, ZFY and AMG gene which located on the short arm of the Y chromosome (Yp) were detected in normal bulls and a XY female, but were not detected in normal cow, mother cow and half-sib heifer by Southern blotting.

Amelogenin↗
PubMed1992

Cough threshold to inhaled tartaric acid and bronchial responsiveness to methacholine in patients with asthma and sino-bronchial syndrome.

To evaluate the effect of chronic airway inflammation on cough sensitivity and bronchial responsiveness, we measured the cough threshold to tartaric acid and bronchial responsiveness to methacholine (PC20-FEV1) in 13 asthmatic, 13 bronchitic (sino-bronchial syndrome) and 49 healthy non-atopic subjects. All subjects were non-smokers. The geometric mean value of the cough threshold was 9.55, 5.62 and 12.3% in asthmatic, bronchitic and normal subjects, respectively. The value in bronchitic subjects was significantly (p less than 0.02) lower than that in normal subjects. The geometric mean value of PC20-FEV1 in asthmatic subjects (0.63 mg/ml) was significantly lower than those in bronchitic (8.7 mg/ml) (p less than 0.01) and normal subjects (21.4 mg/ml) (p less than 0.01). There was no correlation between cough threshold and PC20-FEV1 values [correlation coefficient (r) = 0.06, p greater than 0.1]. These results indicate that cough sensitivity is potentiated by chronic airway inflammation in bronchitis but not in asthma and suggest that cough sensitivity and bronchial responsiveness may be independently potentiated by different mechanisms resulting from chronic airway inflammation.

Adult↗
PubMed1992

A Japanese pedigree of autosomal dominant congenital stationary night blindness with variable expressivity.

Three cases in three successive generations of one family with autosomal dominant congenital stationary night blindness are presented. Case 1, the proband, and Case 3, his grandfather had the same electroretinographic responses: nonrecordable scotopic electroretinogram (ERG), normal but slightly diminished flicker ERG, and negative-shaped single bright-flash ERG. Their dark adaptation curves were monophasic with no rod segment. However, Case 2, the proband's father, showed different ERG findings; a moderately diminished scotopic ERG, a normal flicker ERG, and a biphasic dark adaptation curve with an elevated final rod threshold. The authors believe that these differences reflect variations in the expressivity of a single gene mutation with the lowest expressivity being seen in Case 2.

Adult↗
PubMed1992

[A case of Fabry's disease associated with lupus nephritis].

A 36-year-old woman was hospitalized because of nephrotic syndrome. On admission, laboratory studies revealed total protein 5.9g/dl, total cholesterol 381mg/dl, urine protein 2-4g/day, C3 68mg/dl(90-185mg/dl) and the immunological tests showed that antinuclear factor, anti-DNA antibodies and the LE cell phenomenon were positive. Renal function was within normal range. After admission, renal biopsy was done. Light microscopic finding showed diffuse membranous glomerulonephritis, and vacuolization of epithelial cells. Immunofluorescent microscopic finding showed a granular specific staining for IgG, IgM, C3 and C1q along the capillary loops. Electron microscopic finding showed subepithelial and subendothelial dense deposits, and visceral epithelial cell cytoplasm containing osmiophilic multilamellar lipoid bodies. In the studies of the enzyme activities, the patient's fibroblast extract demonstrated a partial deficiency of alpha-galactosidase, and urine ceramide trihexoside was positive. But the patient's leukocyte extract did not demonstrate a deficiency of alpha-galactosidase. So Fabry's disease associated with lupus nephritis was diagnosed. It seems that the case of Fabry's disease which is an X-linked disorder caused by deficiency of the lysosomal enzyme alpha-galactosidase, associated with lupus nephritis, is extremely rare.

Adult↗