Publications by authors named "Taiga Ninomiya"

Background: In Japan, the effects of reduced water, such as hydrogen-rich electrolyzed reduced water and natural reduced water, like Hita Tenryosui water, have been examined. The purpose of the present study was to identify the role of natural reduced water in anxiety and blood biochemical analysis.

Materials And Methods: Natural reduced water and distilled water were administered to rats for 180 consecutive days, and their effect on anxiety-like behavior and depression was examined by using elevated plus maze, light/dark, forced swimming, and conditioned fear tests.

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Background: Borderline personality disorder (BPD) has a pervasive pattern of instability in interpersonal relationships, self-image, and emotions. BPD may be linked to an abnormal brain anatomy, but little is known about possible impairments of the white matter microstructure in BPD or their relationship with impulsivity or risky behaviors. The aims of the present study were to explore the relationship between BPD and diffusion tensor imaging (DTI) parameters and psychological tests.

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The Specific Levels of Functioning Scale (SLOF) has been reported to provide a measure of social function in patients with schizophrenia. The aim of this multi-center study was to determine convergent validity of the Japanese version of SLOF, and if cognitive insight would be associated with social function. Fifty-eight patients with schizophrenia participated in the study.

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Introduction: Obsessive-compulsive personality disorder (OCPD) has a pervasive pattern of preoccupation with orderliness, perfection, and mental and interpersonal control at the expense of flexibility, openness, and efficiency. The aims of the present study were to explore the relationship between OCPD and psychological stress and psychological tests.

Methods: We evaluated 63 OCPD patients and 107 healthy controls (HCs).

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  • Major depressive disorder (MDD) often resists traditional treatments, and initial NIRS evaluations showed that patients exhibited reduced functioning in the frontotemporal cortex during verbal fluency tasks.
  • A study conducted on treatment-naive MDD patients assessed their reactions to SSRIs over 12 weeks and compared their brain responses to healthy controls, finding significant differences in hemodynamic responses between groups before treatment.
  • The research identified confusion as a key predictor for treatment response, but acknowledged limitations like a small sample size and the challenges of NIRS measurement accuracy that need addressing in future studies.
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Background: Patients with social anxiety disorder (SAD) experience unusual fear in normal social situations. The verbal fluency task (VFT) was administered while subjects were undergoing near-infrared spectroscopy (NIRS) scanning. The purpose of VFT was to examine the functions of the frontal and temporal lobes.

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  • Avoidant personality disorder (AVPD) is characterized by high anxiety and discomfort in social situations; this study aimed to examine how AVPD relates to physical and psychological stress and various psychological tests.
  • The research involved 93 AVPD patients and 355 nonpatient controls, measuring their stress responses through salivary amylase and cortisol levels during specific stress tests, along with administering several psychological assessments.
  • Findings revealed that female AVPD patients had lower cortisol responses to stress compared to controls, while AVPD patients generally showed significantly higher levels of anxiety, mood disturbance, and other psychological issues compared to nonpatients.
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The present study was to investigate the effects of 6 FK506 binding protein 51 (FKBP5) single nucleotide polymorphisms (SNPs) on brain structure using voxel-based morphometry (VBM) and the psychological tests to psychological stress. We genotyped 112 healthy controls with respect to 6 SNPs (rs) of FKBP5. We examined the Beck Depression Inventory and the State (STAI-S) and Trait (STAI-T) versions of the Spielberger Anxiety Inventory and the Profile of Mood States (POMS) to evaluate mood.

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  • Stress coping involves cognitive and behavioral efforts to manage stress through problem-focused and emotion-focused strategies, with genetic factors like BDNF and NTRK2 influencing these coping mechanisms.
  • A study of 252 participants found significant links between BDNF and various emotion-focused coping strategies, as well as between NTRK2 and cognitive problem-solving strategies.
  • The results suggest that genetic variations in BDNF and NTRK2 may contribute to how individuals handle stress and their personality traits.
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  • Borderline personality disorder (BPD) is marked by emotional instability, tumultuous relationships, and issues with self-identity.
  • The study involved measuring stress hormone levels in BPD patients and comparing their psychological responses to those of a control group during stress tests.
  • Results showed that BPD patients exhibited significantly higher anxiety and depression levels and varying hormonal responses to stressors based on gender, indicating different stress response mechanisms among males and females.
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Objective: The aim of the study was to evaluate the association of transmembrane protein 132D (TMEM132D), catechol-O-methyltransferase (COMT), and gamma-aminobutyric acid (GABA) receptor alpha 6 subunit (GABRA6) genotypes with cingulate, frontal cortex and hippocampal emotional processing in panic disorder (PD) and major depressive disorder (MDD).

Method: The single nucleotide polymorphisms (SNPs) in TMEM132D, COMT, and GABRA6 were examined in patients with MDD, PD, and healthy controls. Functional magnetic resonance imaging (fMRI) was performed in patients with MDD, PD, and healthy controls.

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Background: Decreased expression of brain-derived neurotrophic factor (BDNF) is implicated in enhanced stress responses. The BDNF Val66Met polymorphism is associated with psychological changes; for example, carriers of the Met allele exhibit increased harm avoidance as well as a higher prevalence of depression and anxiety disorder.

Methods: To analyze the effects of BDNF Val66Met on stress responses, we tested 226 university students (88 women and 138 men) using a social stress procedure (Trier Social Stress Test [TSST]) and an electrical stimulation stress test.

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Drug therapy with selective serotonin reuptake inhibitors (SSRIs) has been used as a treatment for obsessive-compulsive disorder (OCD). In the present case report, exposure therapy was used in addition to escitalopram (20 mg) to treat a 28-year-old female patient with OCD for 6 months. Her obsessive-compulsive symptoms comprised thoughts of words such as rape, crematorium, neck hanging, unhappy, death, die, and kill and images such as a shelf of gods, a shrine, a Buddhist altar, the sun, the sky, and the faces of her parents, siblings, and relatives.

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Automatic thoughts may be risk factors for depression and anxiety, and should be detected early. However, the genetic basis of automatic thoughts remains unclear. This study aims to investigate the genetic association of automatic thoughts with SNPs (single nucleotide polymorphisms) involved in cognition, neurogenesis, neuronal cell structure, neurotransmitters, hypothalamus-pituitary adrenal axis and psychiatric illness.

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Background: Bipolar disorder (BP) is often associated with a change in hypothalamus- pituitary-adrenal axis function change due to chronic stress. Salivary α-amylase (sAA) levels increase in response to psychosocial stress and thus function as a marker of sympathoadrenal medullary system activity. However, sAA has been studied less often than salivary cortisol in BP patients.

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Objectives: The underlying pathogenic mechanisms and predictors of recurrence in major depressive disorder are still largely unknown. Hypothalamic-pituitary-thyroid (HPT) axis and hypothalamus-pituitary-adrenocortical (HPA) axis dysregulation are thought to be related to the development and course of depression.

Design And Setting: Over a ten-year period, we investigated whether the results of thyrotropin-releasing hormone (TRH) testing and combined dexamethasone/corticotropin-releasing hormone (DEX/CRH) testing could be correlated with the recurrence of depression in 25 outpatients with clinically remitted major depression for at least 10 years.

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  • Salivary α-amylase (sAA) is a potential indicator of stress response linked to the sympathoadrenal medullary system; this study examines its levels in patients with obsessive-compulsive disorder (OCD) compared to healthy individuals.
  • Findings show that OCD patients exhibited significantly higher scores for anxiety and depression while having lower vigor compared to healthy controls, but no differences were observed in heart rate variability (HRV) between the two groups.
  • The research indicates that OCD patients had elevated sAA levels under stress, suggesting a heightened sensitivity to stressors, potentially marking a unique characteristic of OCD.
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  • * Forty-five patients over 50 years old with moderate MDD were treated for 8 weeks, with 12 showing positive responses and 33 not responding to SSRIs; a comparison group of 30 healthy individuals was also included.
  • * Results indicated that non-responsive patients had lower brain blood flow in certain areas compared to responders and controls, suggesting that low blood flow in the frontal cortex may be an indicator of poor SSRI response in older adults.
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  • Two models exist regarding ghrelin's role in stress responses: it may either contribute to stress-induced depression and anxiety or help alleviate these symptoms.
  • A study measured serum ghrelin levels and mood/anxiety scores in individuals with major depressive disorder (MDD) and panic disorder, comparing treatment-resistant patients to responders and healthy controls.
  • Findings showed higher ghrelin levels in treatment-resistant patients, suggesting that lower ghrelin levels may enhance the effect of antidepressant treatments in MDD and panic disorder.
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  • * Through various tests, including a video-EEG and SPECT imaging, findings indicated motor impairment and abnormalities in brain activity, particularly in regions connected to executive functions and memory.
  • * The case suggests a potential causal relationship between the brain damage observed and the man's fire-setting behavior, proposing that disruption in the frontal lobe might contribute to impulse-driven actions like arson.
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  • Salivary alpha-amylase (sAA) and cortisol were measured in healthy volunteers after stress tests to assess their roles in stress response, revealing distinct patterns in each biomarker.
  • Participants were tested with the Trier Social Stress Test (TSST) and electric stimulation stress, showing that sAA spiked quickly and returned to normal, while cortisol rose more slowly and stayed elevated longer.
  • Findings indicated no gender differences in sAA responses, but females had higher cortisol levels after the TSST, and younger participants exhibited greater sAA activity, linking cortisol levels to stress intensity.
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