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Biomedical subjects

Y Takei

Publications and source records attributed to Y Takei.

At least 307 records · Page 17Linked to original sources
PubMed1989

Brain natriuretic peptide-like immunoreactivity is present in human plasma.

A highly specific and sensitive radioimmunoassay (RIA) for a novel porcine brain natriuretic peptide (BNP) has been established to elucidate whether BNP-like immunoreactivity (LI) is present in human plasma. The antibody used was specific for BNP without any crossreactivities with known human atrial natriuretic peptides (hANP). After extraction of human plasma with Sep-Pak cartridge, this assay allowed for detection of BNP-LI as low as 0.1 fmol/tube. In 12 healthy subjects, the mean concentrations of plasma BNP-LI were 1.5 fmol/ml. Reverse-phase HPLC coupled with BNP RIA revealed that the single major component with BNP-LI, corresponding to porcine BNP(1 26), was apparently distinct from that of alpha-hANP. These data indicate that a small molecular mass form with BNP-LI circulates in human blood.

Animals↗
PubMed1989

Obsessive-compulsive symptoms in childhood and adolescence.

We investigated 61 patients (38 boys and 23 girls) under 18 years of age with obsessive-compulsive symptoms seen in the Department of Psychiatry, Nagoya University Hospital, from 1982 until 1986. In this period, a total of 1293 patients under 18 years of age visited the clinic. The percentage of patients with obsessive-compulsive symptoms was 5%. The earliest onset of symptoms was at age 3 years, and the average age of onset was 11.6 years. We found no particular tendency in terms of the number of siblings and the birth order of the patients. Obsessive traits were the fundamental personality traits of patients. Moreover, according to the other characteristics of personality, the patients were subdivided into schizothymic, viscous temperament, and cyclothymic. Parents of the patients were more apt than usual to have obsessive-compulsive personalities. Psychiatric disturbances and occupations were also investigated. Incidents related to school situations commonly triggered obsessive-compulsive symptoms. The most frequently noted obsessive thought was dirt phobia, and the most common compulsive behavior was washing. School refusal and violence at home were especially common as associated symptoms of obsessive-compulsive symptoms. We also describe the treatment regimen and the outcomes of the patients.

Adolescent↗
PubMed1989

[The treatment of traumatic chylothorax].

Traumatic chylothorax is classified as follows; postoperative and nonsurgical. We have encountered 5 cases of traumatic chylothorax, 2 after resection of lung cancer, 2 after repair of congenital heart disease and 1 after blunt chest injury. The incidence of this complication was 0.2% after surgery for cardiovascular diseases, and 0.6% for lung cancer in our institute. We carried out operation two cases successfully, one after resection for lung cancer and the other for Tetralogy of Fallot. The treatment should be determined according to the condition of the underlying diseases. We choose conservative therapy at first which is generally recommended. When chylous discharge continues, conservative therapy should be carried out when new operative skin incision is necessary for the treatment of chylothorax. Operative therapy is desirable in cases with pulmonary resection which makes dead space in pleural cavity.

Adult↗
PubMed1988

Intracranial extracerebral glioneural heterotopia.

A newborn baby girl with intracranial extracerebral glioneural (brain) heterotopia in the right frontoparietal area is described. The heterotopic brain was predominantly composed of neuronal and glial elements, with partial cerebellar differentiation. It also contained well-differentiated adipose tissue. The possible mechanism for its origin and the causes of central nervous system heterotopia are discussed.

Brain Neoplasms↗
PubMed1988

Delayed appearance of blood lactate with reduced frequency breathing during exercise.

The purpose of the present study was to investigate the blood lactate (LA-) responses to hypoventilation induced by reduced frequency breathing (RFB) during recovery from exercise. Five male subject performed 16 4 min cycling bouts alternating with 16 min rest periods. Exercise intensities were chosen at power outputs corresponding to 30% VO2max at 2 mMLA-, VO2 at 4 mMLA-, and 90% VO2max in each subject. Breathing frequency was voluntarily controlled starting 10 s before each 3rd min of exercise and maintained throughout the rest of the exercise period. Four different breathing patterns at each exercise intensity were used: normal breathing (NB), breathing every 4 s, breathing every 8 s, and maximal RFB. Except for the NB trials, subjects held their breath at functional residual capacity during each breathing interval. The concentration difference of LA- between the 3rd min sample and the 4th min sample was defined as the lactate change during exercise (delta LA-ex), and that between the 4th min sample and the sample at the 3rd min after the end of the exercise as the lactate change during recovery (delta LA-rec). An ANOVA showed significant (p less than 0.05) differences in breathing procedures only in delta LA-rec. delta LA-rec seemed to increase as compared to NB only at VO2 at 4 mMLA- and 90% VO2max, while delta LA-ex remained unchanged as compared to NB in spite of reduced VA. These results might indicate that RFB inhibited lactate removal from working muscles during exercise.

Adult↗
PubMed1988

Water intake induced by water deprivation in the quail, Coturnix coturnix japonica.

Mechanisms inducing drinking after water deprivation, and mechanisms terminating drinking after rehydration, were investigated in the quail, Coturnix coturnix japonica. 1. Water intake was induced after 4 h of water deprivation, and the amount of water drunk increased in proportion to the period of water deprivation. Drinking occurred immediately after deprivation. Drinking occurred immediately after deprived birds were given access to water, and continued for periods proportional to the period of water deprivation. 2. Plasma angiotensin II concentration increased, as did plasma osmolality and Na+ concentration, and blood volume decreased after water deprivation. The increase in plasma angiotensin II concentration and decrease in blood volume occurred soon after the start of water deprivation, whereas plasma osmolality and Na+ concentration did not increase until at least 4 h after the start of water deprivation. 3. These results indicate that extracellular dehydration and angiotensin II are responsible for the significant drinking that follows 4 h of water deprivation, and that cellular dehydration is also involved in the stimulation of drinking that occurs after longer periods of water deprivation. 4. Plasma osmolality and Na+ concentration in birds deprived of water for 48 h quickly returned to normal levels after the birds were allowed access to water. Plasma angiotensin II levels and blood volume also approached the values measured prior to water deprivation. However, the rate and degree of restoration of normal values were reduced, and normal values were not restored even after 1.5 h or rehydration when drinking terminated.(ABSTRACT TRUNCATED AT 250 WORDS)

Angiotensin II↗
PubMed1988

Identification of P-450ALC in microsomes from alcohol dehydrogenase-deficient deermice: contribution to ethanol elimination in vivo.

Isozyme 3a of rabbit hepatic cytochrome P-450, also termed P-450ALC, was previously isolated and characterized and was shown to be induced 3- to 5-fold by exposure to ethanol. In the present study, antibody against rabbit P-450ALC was used to identify a homologous protein in alcohol dehydrogenase-negative (ADH-) and -positive (ADH+) deermice, Peromyscus maniculatus. The antibody reacts with a single protein having an apparent molecular weight of 52,000 on immunoblots of hepatic microsomes from untreated and ethanol-treated deermice from both strains. The level of the homologous protein was about 2-fold greater in microsomes from naive ADH- than from naive ADH+ animals. Ethanol treatment induced the protein about 3-fold in the ADH+ strain and about 4-fold in the ADH- strain. The antibody to rabbit P-450ALC inhibited the microsomal metabolism of ethanol and aniline. The homologous protein, termed deermouse P-450ALC, catalyzed from 70 to 80% of the oxidation of ethanol and about 90% of the hydroxylation of aniline by microsomes from both strains after ethanol treatment. The antibody-inhibited portion of the microsomal activities, which are attributable to the P-450ALC homolog, increased about 3-fold upon ethanol treatment in the ADH+ strain and about 4-fold in the ADH- strain, in excellent agreement with the results from immunoblots. The total microsomal P-450 content and the rate of ethanol oxidation were induced 1.4-fold and 2.2-fold, respectively, by ethanol in the ADH+ strain and 1.9-fold and 3.3-fold, respectively, in the ADH- strain. Thus, the total microsomal P-450 content and ethanol oxidation underestimate the induction of the P-450ALC homolog in both strains. A comparison of the rates of microsomal ethanol oxidation in vitro with rates of ethanol elimination in vivo indicates that deermouse P-450ALC could account optimally for 3 and 8% of total ethanol elimination in naive ADH+ and ADH- strains, respectively. After chronic ethanol treatment, P-450ALC could account maximally for 8% of the total ethanol elimination in the ADH+ strain and 22% in the ADH- strain. Further, cytochrome P-450ALC appears to be responsible for about one-half of the increase in the rate of ethanol elimination in vivo after chronic treatment with ethanol. These results indicate that the contribution of P-450ALC to ethanol oxidation in the deermouse is relatively small. Desferrioxamine had no effect on rates of ethanol uptake by perfused livers from ADH-negative deermice, indicating that ethanol oxidation by a hydroxyl radical-mediated mechanism was not involved in ethanol metabolism in this mutant.(ABSTRACT TRUNCATED AT 400 WORDS)

Alcohol Dehydrogenase↗
PubMed1988

Angiotensin II receptors in the fowl aorta.

In the domestic fowl, angiotensin II (ANG II) causes an in vivo depressor response and in vitro relaxation of aortic rings which appear to be a direct action of ANG II on the blood vessels. Thus, we determined whether binding sites specific to ANG II exist in the membrane fraction of the fowl aorta. The particulate fraction of aortas from adult female fowl, Gallus gallus, exhibits high specific binding to ANG II ligand. 125I-[Ile5]ANG II (0.5 nM) binding to the above fraction (30 micrograms protein) in 50 mM Tris (pH 7.2), 10 mM MgCl2, and 0.2% bovine serum albumin at 12 degrees (1) is rapid, saturable, and reversible; (2) increases as a function of ligand or membrane concentration, time, and temperature; and (3) optimally fits to a two-site (high and low affinity) model. The equilibrium dissociation constant (0.15 +/- 0.03 nM) and binding site concentration (28.7 +/- 8.1 fmol/mg protein) of the high affinity site as well as association (0.055 nM-1.min-1) and dissociation (0.0122 min-1) rate constants are similar to those of mammalian vascular ANG II receptors. Both 125I-[Ile5]ANG II and 125I-[Val5]ANG II are competitively displaced by unlabeled ANG II. These results suggest that specific ANG II receptors exist in the fowl aorta.

Angiotensin II↗
PubMed1988

Drinking induced by cellular dehydration in the quail, Coturnix coturnix japonica.

1. Drinking was induced in water-replete quail 5-10 min after intravenous injection of hypertonic NaCl (0.69 osmol/l) or sucrose (1.06 osmol/l), but hypertonic urea (2.78 osmol/l) failed to induce drinking. 2. The birds drank approximately the amount required to dilute the injected solutes to isotonicity for each given dose of NaCl or sucrose. 3. The plasma angiotensin II level decreased after injection of 7% NaCl (2.5 osmol/l), but it increased after injection of an equi-osmolar solution of sucrose (65%). 4. Plasma osmolality and Na+ concentration returned quickly to control levels, and then decreased further, after injection of 7% NaCl or 65% sucrose. 5. Blood volume and blood pressure increased immediately after injection of 7% NaCl or 65% sucrose. 6. These results show that drinking is induced after injection of hypertonic solutions exclusively by cellular dehydration, and other regulatory mechanisms for thirst, such as extracellular dehydration and the renin-angiotensin system, are rather inhibitory after injection of hypertonic NaCl.

Angiotensin II↗
PubMed1988

CT-assisted stereotactic brain biopsy: value of intraoperative frozen section diagnosis.

In 100 recent CT-guided brain biopsies, the value of intraoperative histologic examination using frozen section technique was evaluated. In 87 of these cases, the biopsy was performed stereotactically. In the remaining 13 cases, a CT-guided free hand technique was used. Of the 100 biopsies performed, adequate tissue for histopathologic diagnosis was obtained in 97, and in three the biopsy was nondiagnostic. In 61 procedures the initial biopsy specimen was adequate for diagnosis. Two specimens were required in 25 and in the remaining cases it was necessary to obtain three to four biopsy specimens before a definitive diagnosis could be made. Ultimately, the histologic diagnosis was made on frozen section examination in 93 of the cases. The lesions identified were neoplastic disease in 83 cases, vascular disease in seven, infectious disease in five, demyelinating disease in one, and radiation necrosis in one. Comparison between the frozen section diagnosis and the final diagnosis based on the permanent sections revealed that they matched in 89 cases (92%). Of the 83 cases of neoplasms the exact grade of malignancy was determined by frozen section to make a final diagnosis revealed that even if the specimen volume was less than 2 mm3, the biopsy was generally successful. The disadvantages of the small sample size obtained through needle biopsy are best overcome by careful targeting and assessment of sample quality by intraoperative frozen section examinations, which will give the definitive diagnosis in most of the cases without paraffin-embedded sections.

Adolescent↗
PubMed1988

Transitory cardiovascular responses to rapid infusion of blood into aorta of rabbit.

Blood (5 to 15 ml) was infused into aorta of the anesthetized rabbit through the carotid artery or femoral artery at a constant rate (0.55 to 8.3 ml/s). The carotid sinuses were occluded. The systemic arterial pressure (SAP) began to rise immediately at the onset of the infusion and dropped gradually in most cases during the infusion. SAP continued to decline after the infusion and in many cases became lower than the preinfusion pressure. Within seconds, SAP tapered off to its lowest point and resumed a gradual rise, leveling off higher than its initial pressure. A depressor effect caused by the rapid infusion of blood into the aorta (DRIA) was observed in every rabbit. DRIA was not suppressed much by the section of aortic or vagal nerves. DRIA was markedly suppressed by the administration of alpha-adrenergic blockade, but beta-adrenergic blockade had little effect on DRIA. By using a hydraulic model of the closed circulatory system, a theoretical analysis was made on the basis of the "theory of active fluid element," a theory developed by Hatakeyama, one of the authors, and it was demonstrated that DRIA must not be considered to be a passive hemodynamic phenomenon. The results obtained suggest that a nervous regulatory mechanism--rather than the reflex via the carotid sinus or aortic baroreceptors, or other mechanoreceptors--plays an important part in the venous and the cardiac regions.

Adrenergic alpha-Antagonists↗
PubMed1988

Synthesis and biological activity of spergualin analogues. I.

Stable spergualin analogues were synthesized by substitutions of the alpha-hydroxyglycine residue of spergualin with various alpha- or omega-amino acids. The antitumor activity of these analogues against L1210 and their immunosuppressive effects on delayed-type hypersensitivity and antibody formation was then examined. Analogues substituted with glycine and L-serine showed significant biological activity but were less potent than 15-deoxyspergualin. Among the analogues synthesized so far, 10-[N-4-(4-guanidinophenyl)butyryl-L-seryl]-1,5,10-triazadecane has possessed the strongest antitumor and immunosuppressive activities.

Animals↗
PubMed1988

Topical application of cyclosporine on guinea pig allergic contact dermatitis.

Topical cyclosporine applied to the test site substantially inhibited the elicitation reaction of contact sensitivity in the guinea pigs previously sensitized with 2,4-dinitrochlorobenzene (DNCB). This suppressive effect of the drug was short lived and reversible. Cyclosporine was not effective when given six hours or later after antigenic challenge to the test site. Cyclosporine had no effect on the toxic contact reaction in normal animals either to croton oil or to DNCB in high concentration. Cyclosporine applied topically to the challenge site also resulted in a reduction of retest and flare-up reactions of contact sensitivity to DNCB, but did not affect the production of generalized rash in the same animals. These results indicate that in the future local topical application of cyclosporine may make treatment of human cutaneous immune-mediated disorders a possibility without serious side effects.

Administration, Topical↗
PubMed1987

Delayed-type skin reaction to 2,4-dinitrophenylated epidermal cells in guinea pigs with contact sensitivity to 2,4-dinitrochlorobenzene.

Contact sensitivity (CS) induced by hapten has been thought to be analogous to delayed-type hypersensitivity, such as the Mantoux reaction, because of outstanding similarities between the two phenomena. It can be suggested that animals with CS respond also to intradermal injection of the conjugate of hapten and protein as well as to epicutaneous application of hapten. However, evidence against this has been reported. In the present experiments, delayed-type skin reaction (DSR) was successfully obtained in JY1 strain guinea pigs sensitized by painting the skin with 2,4-dinitrochlorobenzene using in vitro dinitrophenylated epidermal cell suspension (DNP-EC) as antigen for a delayed intradermal test. The experiment using anti-Ia alloantiserum and complement showed that the elicitation of DSR is due to the presence of Ia-positive cells (presumably Langerhans cells) among DNP-ECs. The delayed intradermal test with the conjugates such as haptenated ECs in the animals with CS is considered to be an experimentally useful way of analysing the antigen in the sensitivity.

Administration, Topical↗