Publications by authors named "Ryohei Igata"

Background: Primary aldosteronism (PA) is an adrenal gland disease, that induces increased secretion of the mineralocorticoid, aldosterone, resulting in symptoms such as hypertension. This study reports a patient with agoraphobia and panic attacks, associated with PA. This patient's psychiatric symptoms improved after treatment with eplerenone, a mineralocorticoid receptor antagonist.

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  • Previous research hinted at a link between brain-derived neurotrophic factor (BDNF) levels and worker stress, but this study is the first to explore salivary mature BDNF (mBDNF) as a noninvasive biomarker for psychological distress in healthcare professionals.
  • Conducted with 51 healthcare workers, the study assessed psychological distress using the Kessler 6 scale and compared salivary and plasma mBDNF levels, finding no significant correlations between them or with factors like age and BMI.
  • The results suggest that while salivary mBDNF can be measured noninvasively, it did not correlate with psychological distress as measured by the K6 or with plasma mBDNF levels, indicating
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  • - A 66-year-old man with vascular dementia and seizures developed acute pancreatitis after being treated with valproic acid (VPA), despite showing no specific abdominal symptoms.
  • - Blood tests revealed an inflammatory response, leading to a diagnosis of VPA-induced pancreatitis, prompting the discontinuation of VPA and initiation of high-dose infusions.
  • - The case highlights the need for clinicians to recognize the risk of acute pancreatitis from VPA, especially in elderly patients who may not be able to report symptoms, underscoring the importance of monitoring blood amylase levels.
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  • The study investigates the differences in serum metabolomics between patients with major depressive disorder (MDD) who have type 2 diabetes mellitus and those who do not, as well as healthy individuals.
  • Serum samples from healthy controls, and patients with MDD with and without diabetes were analyzed using advanced mass spectrometry techniques to identify metabolomic patterns.
  • The findings highlight distinct metabolic pathways related to energy conversion, glutamate metabolism, and ketone body synthesis, suggesting that MDD patients with diabetes may exhibit different biochemical profiles compared to those without.
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Background: Numerous protocols exist to counteract prolonged seizures during modified electroconvulsive therapy (mECT), such as anaesthetic adjustments and ventilation. Evidence on methods for deciding whether to continue with the next round of mECT after a prolonged seizure and to prevent recurrent seizures is currently not well established.

Case Presentation: The patient was a 76-year-old woman with major depressive disorder.

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Background: There has been increasing evidence that exercise therapy is effective in the treatment and prevention of major depression (MD). However, the basic molecular mechanisms underlying the effects of exercise on MD remain unclear. We conducted a preliminary study to clarify the effect of exercise therapy on MD, focusing on the dynamics of nitric oxide (NO) and catecholamine metabolites, which have been found to be associated with MD.

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The aim of the present study was to investigate associations between hippocampal subfield volumes and plasma levels of brain-derived neurotrophic factor (BDNF) in patients experiencing a first episode of major depression (MD) ( = 30) as compared to healthy controls (HC) ( = 49). Covariate-adjusted linear regression was performed to compare the MD and healthy groups, adjusting for age, sex, and total estimated intracranial volume. We demonstrated that there were no differences in total hippocampal volume between the MD and HC groups.

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  • * The study focused on comparing the amygdala's volume and plasma levels of brain-derived neurotrophic factor (BDNF) and cortisol between MDD patients and healthy controls, both with the same genetic s/s serotonin transporter gene variant.
  • * Findings showed no significant differences in amygdala volume or plasma levels of BDNF and cortisol between the two groups, and no correlations were found between amygdala volume and these plasma levels.
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Objectives: The response to antidepressants varies significantly among individuals and is difficult to predict before treatment. In this randomised control trial, we explored cytokines that correlate with the therapeutic effect of mirtazapine (MIR) and selective serotonin reuptake inhibitors (SSRIs) and whether they could be predictors of remission for each antidepressant.

Methods: Plasma cytokines, such as tumour necrosis factor-α (TNF-α), interleukin (IL)-1β, IL-2, IL-4, IL-6, IL-8, and granulocyte-macrophage colony-stimulating factor (GM-CSF) were assayed in 95 participants before medication and assayed by the enzyme-linked immunosorbent assay.

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We examined amygdala subregion volumes in patients with a first episode of major depression (MD) and in healthy subjects. Covariate-adjusted linear regression was performed to compare the MD and healthy groups, and adjustments for age, gender, and total estimated intracranial volume showed no differences in amygdala subregion volumes between the healthy and MD groups. Within the MD group, we examined the association between amygdala subregion volume and the 17-item Hamilton Rating Scale for Depression (HAMD) score and the HAMD subscale score, and found no association in the left amygdala.

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Metabolomics has attracted attention as a new method for understanding the molecular mechanisms of psychiatric disorders. Current metabolomics technology allows us to measure over hundreds of metabolites at a time and is a useful indicator of the consequences of complex and continuous changes in metabolic profiles due to the execution of genomic information and external factors of biological activity. Therefore, metabolomics is imperative to the discovery of biomarkers and mechanisms associated with pathophysiological processes.

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The kynurenine (Kyn) pathway may play a role in the pathophysiology of schizophrenia. This pathway shows crosstalk with proinflammatory cytokines, including interleukin-1β (IL-1β), IL-6, and tumor necrosis factor-α (TNF-α), and/or brain-derived neurotrophic factor (BDNF). Moreover, Kyn metabolites affect neurotransmission and cause neurotoxicity.

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Objective: Hippocampal volume is reduced in patients with major depressive disorder (MDD) compared with healthy controls. The hippocampus is a limbic structure that has a critical role in MDD. The aim of the present study was to investigate the changes in the volume of the hippocampus and its subfields in MDD patients who responded to antidepressants and subsequently were in continuous remission.

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Objective: Recently, a genome-wide association study successfully identified genetic variants associated with major depressive disorder (MDD). The study identified 17 independent single-nucleotide polymorphisms (SNPs) significantly associated with diagnosis of MDD. These SNPs were predicted to be enriched in genes that are expressed in the central nervous system and function in transcriptional regulation associated with neurodevelopment.

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  • Patients with major depressive disorder (MDD) show significant differences in brain volume compared to healthy subjects, particularly in regions like the limbic and cortical areas, influencing overall brain structure.
  • The Val158Met polymorphism of the catechol-O-methyltransferase (COMT) gene affects dopamine levels, which are crucial in psychiatric conditions, but the relationship between dopamine, COMT genotype, and brain structure is complex and not fully understood.
  • A study involving 27 MDD patients and 42 healthy subjects found a significant interaction between diagnosis and COMT genotype related to the volume of the right subiculum, suggesting the Val158Met COMT mutation may play a role in brain structure changes in drug-naive, first-episode
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  • * A study examined 38 first-episode drug-naïve MDD patients and 39 healthy individuals to explore how these SNPs relate to brain volume, particularly looking at cortical thickness and hippocampal volumes.
  • * Significant findings included an interaction between the SNP rs6921438 and brain volume in the left hippocampus, showing reduced volume in MDD patients with the G/G genotype, along with higher depressive symptom scores in these individuals compared to those with the A-carrier genotype.
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Objective: We investigated the effects of a single instance of caffeine intake on neurocognitive functions and driving performance in healthy subjects using an established cognitive battery and a driving simulator system.

Methods: This study was conducted in a double-blind, randomized, placebo-controlled manner from February 19, 2016 to August 6, 2016. Caffeine intake was discontinued 3 days prior to the study.

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  • Recent research suggests that inflammation may play a role in the development of major depressive disorder (MDD).
  • A study compared brain structure and serum cytokine levels between 35 drug-naive MDD patients and 35 healthy subjects, finding significant differences in white matter integrity.
  • The results indicated that reduced integrity in specific brain regions correlated with higher levels of the inflammatory cytokine IL-1β in patients experiencing their first depressive episode.
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There is a growing body of evidence to support the involvement of proinflammatory cytokines in the pathophysiology of depression; however, no previous studies have examined the relationship between cytokines and the brain morphology of patients with major depressive disorder (MDD). We therefore evaluated the relationship between serum cytokine levels and cortical thinning during the first depressive episode in drug-naïve patients with MDD. We measured the serum cytokine levels (IL-1β, IL-6, IFN-γ, and TNFα), and whole-brain cortical thickness and hippocampal subfield volumes on brain magnetic resonance imaging (MRI) using surface-based morphometry in 40 patients with MDD and 47 healthy volunteers (controls).

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Aripiprazole has been reported to exert variable effects on cognitive function in patients with schizophrenia. Therefore, in the present study, we evaluated biological markers, clinical data, and psychiatric symptoms in order to identify factors that influence cognitive function in patients with schizophrenia undergoing aripiprazole treatment. We evaluated cognitive function in 51 patients with schizophrenia using Brief Assessment of Cognition in Schizophrenia (BACS), as well as background information, psychiatric symptoms, plasma catecholamine metabolites-homovanillic acid (HVA), 3-methoxy-4-hydroxyphenylglycol (MHPG)-, and serum brain-derived neurotrophic factor (BDNF).

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Objectives: The etiology of depression remains unknown. There is, however, a growing body of evidence that cytokines are involved in the pathophysiology of depression. The aim of this study is to investigate the effects of fluvoxamine on plasma interleukin-6 (IL-6) levels and on clinical improvement of the depressive state.

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