• 생약학회지
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• 제46권4호
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• pp.327-333
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• 2015

Alzheimer's disease (AD) is a progressive neurodegenerative disorder symptomatically characterized by impairment in memory and cognitive abilities. AD is characterized pathologically by the deposition of ${\beta}$-amyloid ($A{\beta}$) peptides of 40-42 residues, which are generated by processing of amyloid precursor protein (APP). $A{\beta}$ has been believed to be neurotoxic and now is also considered to have a role on the mechanism of memory dysfunction. In this study, we tested that EtOH extract of the fruits of Chaenomeles sinensis Koehne (CSE) affects on the processing of APP from the APPswe over-expressing Neuro2a cell line. We found that CSE increased over 2 folds of the $sAPP{\alpha}$ secretion level, a metabolite of ${\alpha}$-secretase. We showed that CSE reduced the secretion level of $A{\beta}42$ and $A{\beta}40$ by down regulation of ${\beta}$-secretase (BACE) without cytotoxicity. Furthermore, we found that CSE inhibited BACE and acetylcholinesterase activity in vitro. We suggest that Chaenomelis Fructus may be an useful source to develop a herbal medicine for AD.

• 한방재활의학과학회지
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• 제30권4호
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• pp.105-117
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• 2020

Objectives The objective of this study is to assess the effectiveness of electroacupuncture for patients with hip arthroplasty. Methods According to participants, intervention, comparison, outcome, study design, we searched for clinical studies that conducted electroacupuncture for patients with hip arthroplasty. Results Finally 11 randomized controlled trials were chosen for systemic review and meta-analysis. The frequently used evaluation tools were Incidence of postoperative cognitive dysfunction (POCD), heart rate, blood pressure. Almost studies showed electroacupuncture has effects for patients with hip arthroplasty. Through meta analysis, Electoacupuncture showed statistically significant effect of reducing the anesthetic dosage and incidence of postoperative psychonosema and adverse reactions in intra-operation period, reducing the incidence of POCD in peri-operation period, incidence of deep venous thrombosis in post-operation period. Conclusion 11 studies reported that electroacupuncture has significant effects on hip arthroplasty. But, many studies were assessed in a probable high risk of bias. And all studies published in one overseas country. So, it requires attention to comprehend this study. To make up for this limitaion, more well designed clinical research are needed.

• Bulletin of the Korean Chemical Society
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• 제28권2호
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• pp.285-291
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• 2007

The 5-HT6 antagonists are mainly related to the treatment of cognitive dysfunction or impairment associated with Alzheimer's disease and schizophrenia. There have been lots of efforts to develop 5-HT6 antagonists. As in our efforts, arylsulfonylpiperazine derivatives 1-3 were designed, synthesized and biologically evaluated against the human recombinant 5-HT6 serotonin receptor. Total 36 compounds were synthesized and the most active compound among the synthesized compounds is compound 2h with an IC50 value of 1.5 μM. The compound 2h is novel as 5-HT6 receptor ligand and could act as lead for the novel 5-HT6 receptor ligands.

• 약학회지
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• 제52권5호
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• pp.384-393
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• 2008

We examined the effect of green tea extract (GTE) and L-theanine combination on the $A{\beta}_{1-42}$-induced memory dysfunction. GTE and combination were administrated into mice for 3 weeks followed by injection of $A{\beta}_{1-42}$ to induce memory impairment. GTE and L-theanine administration significantly improved cognitive ability and reduced $A{\beta}_{1-42}$ level accompanied with the inhibition of neuronal cell death and activities of secretase. These results suggest that GTE and L-theanine combination may be a useful for preventing for the development or progression of Alzheimer's disease.

• Fisheries and Aquatic Sciences
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• 제21권12호
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• pp.38.1-38.9
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• 2018

Alzheimer's disease (AD) is a disturbing and advanced neurodegenerative disease and is characterized pathologically by the accumulation of amyloid beta ($A{\beta}$) and the hyperphosphorylation of tau proteins in the brain. The deposition of $A{\beta}$ aggregates triggers synaptic dysfunction, and neurodegeneration, which lead to cognitive disorders. Here, we found that FF isolated from an eatable perennial brown seaweed E.bicyclis protect against $A{\beta}$-induced neurotoxicity in neuroblastoma cells stably transfected with two amyloid precursor protein (APP) constructs: the APP695 cDNA (SH-SY5Y-APP695swe). The FF demonstrated strong inhibitory activity for ${\beta}$-secretase ($IC_{50}$ $16.1{\mu}M$) and its inhibition pattern was investigated using Lineweaver-Burk and Dixon plots, and found to be non-competitive. Then, we tested whether FF could inhibit production of $A{\beta}$ in SH-SY5Y-APP695swe. FF inhibited the production of $A{\beta}$ and soluble-APP, residue of APP from cleaved APP by ${\beta}$-secretase. Our data show that FF can inhibit the production of $A{\beta}$ and soluble-$APP{\beta}$ via inhibition of ${\beta}$-secretase activity. Taken together these results suggest that FF may be worthy of future study as an anti-AD treatment.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• 제32권3호
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• pp.85-92
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• 2021

Attention-deficit/hyperactivity disorder (ADHD) leads to functional decline in academic performance, interpersonal relationships, and development in school-aged children. Early diagnosis and appropriate intervention can significantly reduce the functional decline caused by ADHD. Currently, there is no established biological marker for ADHD. Some studies have suggested that various indicators from the quantitative electroencephalogram (QEEG) may be useful biological markers for the diagnosis of ADHD. Until the 2010s, theta/beta ratio (TBR) was a biomarker candidate for ADHD that consistently showed high diagnostic value. However, limitations of TBR have recently been reported. Studies have demonstrated that phase-amplitude coupling, especially theta phase-gamma amplitude coupling, are related to cognitive dysfunction and may assist in the diagnosis of ADHD. As yet, the underlying mechanism is not clearly established, and the clinical efficacy of these biomarkers needs to be proven through well-controlled studies. Based on the heterogeneous characteristics of ADHD, subgrouping through QEEG plays a key role in diagnosis and treatment planning. Sophisticated, well-designed studies and meta-analyses are necessary to confirm these findings.

• 대한의생명과학회지
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• 제27권4호
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• pp.208-215
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• 2021

The purpose of this study was to explain the pathology of Alzheimer's disease (AD) and to investigate the correlation between AD and microRNA. AD is the most common type of dementia, accounting for about 80% of all types of dementia, causing dysfunction in various daily activities such as memory loss, cognitive impairment, and behavioral impairment. The typical pathology of AD is explained by the accumulation of beta-amyloid peptide plaques and neurofibrillary tangles containing hyperphosphorylated tau protein. On the other hand, microRNA is small non-coding RNA 22~23 nucleotides in length that binds to the 3' untranslated region of messenger RNA to inhibit gene expression. Many reports explain that microRNAs found in circulating biofluids are abundant in the central nervous system, are involved in the pathogenic mechanism of AD, and act as important factors for early diagnosis and therapeutic agents of AD. Therefore, this paper aims to clarify the correlation between AD and microRNA. In this review, the basic mechanism of miRNAs is described, and the regulation of miRNAs in the pathological processes of AD are highlighted. Furthermore, we suggest that miRNA-based system in development of therapeutic and diagnostic agents of AD can be a promising tool.

• Biomolecules & Therapeutics
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• 제31권2호
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• pp.148-160
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• 2023

Depression is a neuropsychiatric disorder associated with persistent stress and disruption of neuronal function. Persistent stress causes neuronal atrophy, including loss of synapses and reduced size of the hippocampus and prefrontal cortex. These alterations are associated with neural dysfunction, including mood disturbances, cognitive impairment, and behavioral changes. Synaptic plasticity is the fundamental function of neural networks in response to various stimuli and acts by reorganizing neuronal structure, function, and connections from the molecular to the behavioral level. In this review, we describe the alterations in synaptic plasticity as underlying pathological mechanisms for depression in animal models and humans. We further elaborate on the significance of phytochemicals as bioactive agents that can positively modulate stress-induced, aberrant synaptic activity. Bioactive agents, including flavonoids, terpenes, saponins, and lignans, have been reported to upregulate brain-derived neurotrophic factor expression and release, suppress neuronal loss, and activate the relevant signaling pathways, including TrkB, ERK, Akt, and mTOR pathways, resulting in increased spine maturation and synaptic numbers in the neuronal cells and in the brains of stressed animals. In clinical trials, phytochemical usage is regarded as safe and well-tolerated for suppressing stress-related parameters in patients with depression. Thus, intake of phytochemicals with safe and active effects on synaptic plasticity may be a strategy for preventing neuronal damage and alleviating depression in a stressful life.

• Journal of Korean Dental Science
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• 제16권2호
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• pp.204-210
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• 2023

Lesch-Nyhan syndrome is a rare X-linked recessive disorder characterized by a deficiency of the enzyme hypoxanthine-guanine phosphoribosyl transferase, which is important in the metabolism of purines. Prevalence of Lesch-Nyhan syndrome is 1:100,000 to 1:380,000 live births, and Lesch-Nyhan syndrome mainly affects males. It is characterized by neurologic dysfunction, uric acid overproduction, and cognitive and behavioral disturbances. The self-mutilation is the most distinctive symptom in Lesch-Nyhan syndrome, appearing about 1 year of age. It is expressed as persistent bites in the oral mucosa, tongue, lips, and fingers, which leads to the total or partial destruction of the affected tissues. Several medical and dental management methods might be performed in Lesch-Nyhan syndrome patients. Dental approaches to prevent injuries caused by self-mutilation include treatments with oral appliances such as mouth guards or lip bumpers, extraction, and orthognathic surgery. This report described two brothers with Lesch-Nyhan syndrome, who injured themselves on oral tissues. The methods of tooth reduction and extraction were performed to prevent injuries caused by self-mutilation.

• 대한불안의학회지
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• 제19권2호
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• pp.56-60
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• 2023

Progressive supranuclear palsy (PSP) is rare atypical Parkinsonism accompanied by various psycho-behavioural problems. In this case report, we describe the diagnostic and treatment progress of a 65-year-old PSP patient who visited the psychiatric clinic with a depressed mood and lumbar pain resulting in a suicide attempt. Over the course of 30 months of treatment, typical characteristics of PSP, such as postural instability, dyskinesia, cognitive dysfunction and supranuclear gaze palsy, became prominent, and magnetic resonance imaging and the F-18 FP-CIT positron emission tomography revealed midbrain atrophy and reduced dopamine uptake in the basal ganglia. When treating elderly patients with depression, parkinsonism symptoms such as gait disturbances, frequent falls, tremors, and rigidity should be closely examined.