Biomedical subjects

T Someya

Publications and source records attributed to T Someya.

At least 73 records · Page 4Linked to original sources

PubMed1999

Relationship between stress coping and personality in patients with major depressive disorder.

BACKGROUND: Stress coping is defined as a behavioral or cognitive response of an individual to uncomfortable or difficult situations. It has been suggested that coping, like personality, is related to the pathology and course of mental disorders. Accordingly, we here used a clinical sample to investigate the relationships between coping strategies and personality traits. METHODS: Subjects were 60 outpatients who were in remission from major depressive disorder and who completed the Coping Inventory for Stressful Situations (CISS) and the Munich Personality Test (MPT). RESULTS: Task-oriented coping showed a positive correlation with extraversion and frustration tolerance. Emotion-oriented coping was closely associated with neuroticism, esoteric tendencies and isolation tendency. Avoidance-oriented coping was related to extraversion. Principal component analysis indicated three corresponding factors between coping and personality; one was related to psychopathology (loading from the neuroticism, esoteric tendencies and isolation tendency scales of the MPT, and from the emotion-oriented coping scale of the CISS), a second was a social-adaptive ability component (loading from the frustration tolerance and extraversion scales of the MPT, and from the task-oriented coping and avoidance-oriented coping scales of the CISS), and a third was a passive-avoidance coping component (loaded from the emotion-oriented coping and avoidance-oriented coping scales of the CISS only). CONCLUSION: Some personality traits such as extraversion and frustration tolerance are significantly related to task-oriented coping, and psychopathological personality traits such as neuroticism are associated with emotional-oriented coping in major depressive disorder.

Adaptation, Psychological↗

PubMed1999

A pharmacotherapy algorithm for the treatment of dysthymia in Japan.

Based on randomized controlled trials conducted in western countries, we proposed a pharmacotherapy algorithm for DSM-IV dysthymia in Japan. The main strategy of the algorithm are: firstly, one of the antidepressants is selected for an initial agent, and secondly, efficacy of the selected antidepressant is evaluated at 8 to 12 weeks. The agent with sufficient efficacy is continued for at least 6 months, while ineffective agent is replaced to another antidepressant. The algorithm is preliminary mainly because of the lack of data from Japanese samples and the unavailability of some useful agents in Japan, for instance, selective serotonin reuptake inhibitors and monoamine oxidase inhibitors.

Algorithms↗

PubMed1998

Parental Bonding Instrument and the Inventory to Diagnose Depression Lifetime version in a volunteer sample of Japanese workers.

This study replicated the factor structure of the Parental Bonding Instrument (PBI), and explored the relationships of PBI scores to demographic variables. We investigated the association between parental bonding in the parents measured by the PBI, and lifetime history of depression in their children assessed by the Inventory to Diagnose Depression Lifetime version (IDDL) in a volunteer sample of 239 Japanese workers. In factor analyses with varimax rotation (two-factor solution), the PBI items for both parents showed clear bimodality, and the total variance explained by the two factors was similar to that found in previous Western studies. Subjects with a lifetime history of depression reported a significantly lower score on maternal care than did those without a lifetime history of depression. Without requiring 2 weeks symptom duration on the IDDL, low maternal care was also related to a history of depression. The relationships between PBI scores and age, education, sex of respondent, and sex of parent differed in part from those in Western subjects. These results suggested the following: (1) child-rearing behaviors in non-Western cultures can be, similarly to those in Western cultures, described with the PBI; (2) parental styles, as measured by the PBI, may be associated with depression in non-Western subjects; and (3) sociodemographic influences on PBI scores may be different in subjects with different cultural backgrounds.

Child↗

PubMed1998

Plasma concentrations of timiperone and its reduced metabolite in the patients on timiperone.

Plasma levels of timiperone (TIM) and reduced timiperone (RTIM) were determined in 10 schizophrenic patients who were treated with TIM. Activities of ketone reductase in red blood cells (RBC) were assayed using TIM and haloperidol (HAL) as substrates. Plasma levels of TIM and RTIM ranged from 3.2 ng/mL to 9.5 ng/mL and from 1.7 ng/mL to 7.6 ng/mL, respectively, and approximately four-fold inter-individual variations in RTIM/TIM (0.37-1.43, 0.67 +/- 0.25) were observed. There were significant and positive correlations between plasma levels of TIM or RTIM with the daily doses of TIM (mg/kg body weight); TIM (ng/mL)= 19.5 x daily dose of TIM (mg/kg) + 1.3, r = 0.79, n = 18, P < 0.01; RTIM (ng/mL) = 13.1 x daily dose of TIM (mg/kg) + 0.7, r = 0.73, n = 18, P < 0.001). Given 0.3 mg/kg of TIM, a plasma level of TIM as 7.15 ng/mL was predicted, which is approximately 60% that of HAL. The activity of TIM reductase in RBC was determined as approximately 70% of HAL reductase in RBC, although the correlation between the activities of TIM reductase and HAL reductase in RBC was high (r = 0.98, n = 10, P < 0.001).

Adolescent↗

PubMed1998

Frequency distribution of serum cholesterol levels in patients with panic disorder: comparison with normal controls.

We compared the frequency distribution of total cholesterol (TC) levels in 103 patients with panic disorder (PD) with that in 173 gender- and age-matched normal controls (NC). There was no significant difference in the mean TC level between the PD and the NC groups. The distribution of TC levels in the PD group was similar to that in the NC group. As a whole distribution pattern, there is no association between high serum cholesterol levels and panic disorder. However, four male PD patients had very high TC levels of more than 260 mg/dL, and two of them had obviously deviated values from the frequency distribution of TC levels in the NC group. Our findings are supportive of the view that male PD patients with high TC levels have excess mortality due to cardiovascular diseases.

Adult↗

PubMed1998

Carbonyl reduction of timiperone in human liver cytosol.

This in vitro study using human liver enzymes was undertaken in order to compare the mechanism of metabolic reduction of timiperone, a potent butyrophenone neuroleptic, with that of haloperidol. Conversion of timiperone to reduced timiperone in liver cytosol was confirmed. The carbonyl reductase inhibitors (menadione IC50 5-18 microM; ethacrynic acid IC50 26-51 microM) potently inhibited both timiperone reductase and haloperidol reductase activity, while 4-methylpyrazole (alcohol dehydrogenase inhibitor) had no effect and phenobarbital (aldehyde reductase inhibitor) had a weak inhibitory effect. The formation of reduced timiperone was highly correlated with the formation of reduced haloperidol(r = 0.87, n = 6, P < 0.02). Timiperone reductase activity was approximately 40% lower than haloperidol reductase activity (at a substrate concentration of 100 microM, two-tailed t-test, P < 0.05). The Michaelis-Menten constant (Km) and maximum velocity (Vmax) of reduced timiperone formation were much lower than reduced haloperidol formation (K(m) values: 29.7 +/- 15.1 versus 381.3 +/- 1.1 microM, n = 3, P < 0.01; Vmax: 0.81 +/- 0.19 versus 6.00 +/- 1.47 nmol/mg/min; n = 3, P < 0.05). However, the ratio Vmax/K(m) (clearance) for timiperone was 1.3-2.4 times higher than for haloperidol, indicating that metabolic clearance of timiperone by carbonyl reductase may be similar to or slightly higher than for haloperidol.

Alcohol Oxidoreductases↗

PubMed1997

Multiple regression analysis of relationship between frontal lobe phosphorus metabolism and clinical symptoms in patients with schizophrenia.

We investigated the differences among diagnostic types of 36 schizophrenic patients in the brain phosphorus metabolism in the frontal lobe. We performed phosphorus-31 magnetic resonance spectroscopy (31P-MRS) in the frontal region in patients with schizophrenia of the catatonic (n = 4), disorganized (n = 8), paranoid (n = 10) and undifferentiated (n = 14) types. In the disorganized type, the PME level was significantly decreased compared to those in the other three types, while the phosphodiester (PDE) level tended to be higher, although not significantly, than those in the other types. Using multiple regression analysis, we investigated whether or not the clinical symptoms were correlated with the brain phosphorus metabolism. An increased motor retardation factor score was significantly correlated with decreased PME level, whereas more severe emotional withdrawal and blunted affect were associated with increased PDE level. These results suggest that altered membrane phospholipid metabolism in the frontal region may be associated with negative symptoms and that schizophrenia of the disorganized type is associated with more severe negative symptoms and may present more severe brain abnormalities compared to the other types.

Adolescent↗

PubMed1997

Cell-transforming activity and genotoxicity of phenolphthalein in cultured Syrian hamster embryo cells.

Phenolphthalein is a cathartic agent widely used in non-prescription laxatives. For the simultaneous assessment of in vitro carcinogenicity and mutagenicity of phenolphthalein, the ability of this chemical to induce cell transformation and genetic effects was examined using the Syrian hamster embryo (SHE) cell model. Cell growth was reduced by treatment with phenolphthalein at 10-40 microM in a dose-related manner. Treatment with phenolphthalein for 48 hr induced a dose-dependent increase in morphological transformation of SHE cells. Over the dose range that resulted in cell transformation ( 10-40 microM), treatment of SHE cells with phenolphthalein induced gene mutations at the hprt locus but not at the Na+/K+ ATPase locus. A statistically significant level of chromosomal aberrations was elicited in SHE cells treated with phenolphthalein at the highest dose (40 microM). Meanwhile, neither numerical chromosomal changes nor DNA adduct formation, analyzed by the nuclease P1 enhancement version of 32P-post-labeling, were induced by treatment with phenolphthalein at any concentrations examined. We thus report cell-transforming activity and mutagenicity of phenolphthalein assessed with the same mammalian cells in culture. Our results provide evidence that phenolphthalein has cell-transforming and genotoxic activity in cultured mammalian cells. The mutagenic and clastogenic activities of phenolphthalein could be a causal mechanism for carcinogenicity in rodents.

Animals↗

PubMed1997

Significance of monitoring plasma levels of amitriptyline, and its hydroxylated and desmethylated metabolites in prediction of the clinical outcome of depressive state.

The clinical significance of monitoring the plasma levels of amitriptyline and its metabolites in prediction of the clinical outcome of depressive episode was investigated in 49 inpatients. Discriminant analysis of drug concentrations (at two weeks after initiation of drug treatment) and clinical outcome revealed that increasing the plasma levels of amitriptyline, cis-isomers of hydroxylated metabolites (Z-10-hydroxyamitriptyline and Z-10-hydroxynortriptyline) predicted a better clinical outcome, while increasing of plasma levels of nortriptyline and trans-isomers of hydroxylated metabolites (E-10-hydroxyamitriptyline and E-10-hydroxynortriptyline) were shown to predict a poor clinical outcome in the depressive episode of the subjects, and that clinical outcome of approximately 73% of the subjects could be correctly predicted.

Adult↗

PubMed1997

Differences in symptom structure between panic attack and limited symptom panic attack: a study using cluster analysis.

We had investigated the clinical characteristics of panic disorder (PD) in a Japanese outpatient population comprised of more than 250 patients diagnosed as having PD during a 13-year study period and observed that some PD patients had both panic attacks (PA) and limited symptom panic attacks (LPA). In the criteria for PD based on the Diagnostic and Statistics Manual of Mental Disorders, third edition-revised (DSM-III-R), episodes involving four or more symptoms are classified as PA, while those involving fewer than four symptoms are described as LPA. Therefore, LPA is identified as part of an episode of PA, since the difference between the two episodes is only in the number of symptoms. However, some recent research suggests that there is a distinct subgroup of individuals who suffer LPA. Using cluster analysis, we investigated the differences between PA and LPA groups in terms of the structures of several panic symptoms, which included anticipatory anxiety, agoraphobia and 13 clinical symptoms based on the DSM-III-R at the time of panic attacks, in 247 patients with PD. Cluster analysis revealed clusters of three and four panic symptoms in the PA group and LPA group, respectively, and there were also differences in symptom structure between the two groups. These results suggest that there may be a subgroup of individuals who show LPA among PD patients.

Adult↗

PubMed1997