Publications by authors named "Sang Yoon Choi"

() is known for its anti-inflammatory, antioxidant, and anticancer properties, making it a common choice in traditional medicine practices. Researchers in several recent studies have focused on isolating individual phytochemicals from this plant through chromatography analysis to explore their therapeutic potential. In our previous work, we identified 8-methoxybicolosin C (8-MC) as a novel flavonoid derivative, isolated and purified from the roots of , which exhibited inhibitory effects on cell proliferation.

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Ulcerative colitis (UC) is associated with intestinal barrier dysfunction, gut microbiome (GM) dysbiosis, inflammation, and immune dysregulation. Lactic acid bacteria-derived exopolysaccharides (LAB-EPS) have biotherapeutic potential to stimulate immune responses and influence the GM. Therefore, this work aimed to extract the bioactive EPS (EPS-W-1) from Lactiplantibacillus plantarum ZL1, isolated from Korean kimchi, and then characterize the chemical structure of EPS-W-1 using HPLC, GC-MS, and NMR.

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Lesbicoumestans are a class of bioactive compounds isolated from the roots of Lespedeza bicolor (L. bicolor). These compounds have been reported to exhibit anticancer and antiproliferative activities.

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The novel anthrax vaccine candidate GC1109, composed of recombinant protective antigen, has shown robust antibody responses and safety in preclinical and clinical studies. However, the assessment of GC1109 vaccine efficacy was limited in a rodent model and could not be applied in clinical studies due to ethical issues. In this study, we aim to provide predictive insights for human applications of GC1109 by examining the correlation between anthrax toxin-neutralizing antibodies (TNAs) and protection against Bacillus anthracis infection in rabbit.

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Metabolic dysfunction-associated steatotic liver disease (MASLD) is a leading global liver disorder. Parsnip (Pastinaca sativa), rich in dietary fiber and medicinal properties, has shown health benefits, but its effects on MASLD are largely unexplored. This study evaluated the prebiotic and anti-MASLD effects of parsnip root water-soluble extract (PRE) in a mouse model.

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(sweet flag), a medicinal plant, especially its rhizome, shows strong antioxidant and anti-inflammatory effects; however, its efficacy in treating intestinal inflammation and obesity is still unexplored. In this study, we investigated the prebiotic activity of sweet flag rhizome extract (SRE) and its preventive effects against high-fat diet (HFD)-induced obesity and colonic inflammation. The prebiotic activity was assessed based on the prebiotic activity scores of four probiotic strains.

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Expensive fetal bovine serum (FBS) is a major obstacle to the production of cultivated meat. However, because FBS substitutes do not sufficiently induce cell proliferation, a good alternative is to reduce the amount of FBS and use ingestible additives to promote cell proliferation. In this study, Grifola frondosa extract (GFE) was used to investigate its potential as an additive to promote myogenesis of bovine muscle satellite cells from Hanwoo cattle under low serum conditions (10 % FBS).

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Article Synopsis
  • The study explores how neuroinflammation and microglial activation contribute to diseases like Alzheimer's and Parkinson's, indicating that managing these processes could slow down disease progression.* -
  • Researchers examined the effects of M. officinalis ethanol extract on microglial activation caused by lipopolysaccharide (LPS), finding that it significantly reduced nitric oxide production and inflammatory cytokines.* -
  • The extract also influenced key inflammatory pathways and boosted the expression of antioxidant markers, suggesting its potential as a neuroprotective treatment for inflammation-related neurodegenerative diseases.*
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Recent assessments of the correlations between food and medicine underscore the importance of functional foods in disease prevention and management. Functional foods offer health benefits beyond basic nutrition, with fresh fruits and vegetables being particularly prominent because of their rich polyphenol content. In this study, we elucidated the phytochemicals in ice plant (), a globally consumed vegetable, using an LC-QTOF/MS-based untargeted detection method.

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Ethnopharmacological Relevance: Orostachys japonica (rock pine) has been used as a folk remedy to treat inflammation, hepatitis, and cancer in East Asia.

Aim Of The Study: The aim of this study was to investigate the effect of rock pine extract (RPE) on high-fat diet-induced obesity in mice and to examine its effects on gut dysbiosis.

Materials And Methods: The characteristic compound of RPE, kaempferol-3-O-rutinoside, was quantified using high-performance liquid chromatography.

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This work developed Acer tegmentosum extract-mediated silver nanoparticles (AgNPs) loaded chitosan (CS)/alginic acid (AL) scaffolds (CS/AL-AgNPs) to enhance the healing of E. coli-infected wounds. The SEM-EDS and XRD results revealed the successful formation of the CS/AL-AgNPs.

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Doxorubicin (DOX), an effective chemotherapeutic drug, causes cardiotoxicity in a cumulative and dose-dependent manner. The aim of this study is to investigate the effects of hot-water extract of (CBW) on DOX-induced cardiotoxicity (DICT). We utilized H9c2 rat cardiomyocytes and MDA-MB-231 human breast cancer cells to evaluate the effects of CBW on DOX-induced cell death.

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Article Synopsis
  • A cohort study was conducted in Korea to evaluate the effectiveness of different vaccine combinations against severe COVID-19 outcomes in the elderly.
  • The study took place from January to August 2022.
  • Findings revealed that recipients of 4 doses of mRNA vaccines had a high vaccine effectiveness (VE) of 96.1% against death, while those with a combination of 1 dose of viral vector and 3 doses of mRNA had a VE of 90.8%.
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A recombinant protective antigen anthrax vaccine (GC1109) is being developed as a new-generation vaccine by the Korea Disease Control and Prevention Agency. In accordance with the ongoing step 2 of phase II clinical trials, the immunogenicity and protective efficacy of the booster dose of GC1109 were evaluated in A/J mice after 3 serial vaccinations at 4-week intervals. The results indicated that the booster dose significantly increased the production of anti-protective antigen (PA) IgG and toxin-neutralizing antibody (TNA) compared with those of the group without booster.

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Article Synopsis
  • A study evaluated the effectiveness of a fourth mRNA COVID-19 vaccine dose in people aged 60 and older in Korea during the Omicron BA.2 and BA.5 variants.
  • The effectiveness against severe infections was found to be 67.7% within the first 31-60 days after the booster.
  • By 61-90 days, the effectiveness slightly decreased to 62.1%, indicating ongoing protection but reduced efficacy over time.
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Article Synopsis
  • - A nationwide survey of Korean parents revealed that 56.4% were willing to vaccinate their children against COVID-19, highlighting the need to understand parents' attitudes and awareness regarding vaccines for effective vaccination strategies.
  • - Factors that contributed to vaccine hesitancy included being a mother, lower education levels, previous hesitancy towards other vaccines, and personal refusal to get vaccinated, while trusting the child's doctor and positive perceptions of vaccine effectiveness increased acceptance.
  • - To improve COVID-19 vaccination rates among children, it's crucial to provide parents with reliable information on vaccine safety and effectiveness, and to tailor communication strategies based on parental demographics.
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Article Synopsis
  • Vaccination against COVID-19 is crucial for improving health outcomes, but many parents in South Korea are hesitant to vaccinate their children due to concerns over vaccine information.
  • A study surveyed over 113,000 elementary school parents to understand their decision-making regarding COVID-19 vaccination for their children, focusing on the perceived sufficiency and credibility of vaccine information.
  • Results indicated that only 6.5% of parents accepted the vaccine for their children, with a significant correlation between the adequacy of information received and the likelihood of parents agreeing to vaccination.
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  • Researchers assessed the impact of a second mRNA COVID-19 booster on infection risks in immunocompromised individuals and long-term care facility residents in South Korea from February to May 2022.
  • Out of nearly 1 million eligible participants, 75.7% received a first booster while only 24.3% got a second booster dose.
  • Results showed that the second booster significantly improved protection against all infections (22.28% effectiveness), critical infections (56.95%), and deaths (62.96%) when compared to just having the first booster.
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This study shows the inhibitory effect of sea buckthorn (Hippophae rhamnoides L.) extracts, sea buckthorn leaf (HRL) and berry (HRB), on the formation of advanced glycation endproducts (AGEs), closely linked to diverse disease. In vitro assay revealed the superior inhibitory effect of HRL on the AGEs formation and AGEs-induced collagen crosslinking compared with that of HRB.

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Botulism is a neuroparalytic disease caused by a neurotoxin produced by . This study aimed to genetically characterize strain isolated from the first case of infant botulism in Korea reported on June 17, 2019. We isolated strain CB-27 from a stool sample of the patient and analyzed the toxin types and toxin gene cluster compositions of the strain using a mouse bioassay, real-time PCR, and genome sequencing.

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Radish (Raphanus sativus) greens are commonly used as a vegetable in Korea; however, their anti-obesity effect has not been reported yet. We prepared the polysaccharide fraction of radish greens (PRG) and assessed its anti-obesity activity in high fat diet (HFD)-induced obese C57BL/6J mice. Supplementation with 4 mg/kg PRG reduced weight gain and body fat percentage, and regulated serum biomarkers against HFD-induced obesity.

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Despite the increasing prevalence of overweight or obesity in the global population, most of the approved drugs for obesity are still not ideal for long-term use due to severe cardiovascular and/or neurological side effects. Therefore, we designed a library-implemented virtual screening (VS) approach to discover new anti-obesity agents without significant toxicity. The Bayesian classification and 3D pharmacophore model for the VS process were built by using the screening results of our in-house library of natural piper amide-like compounds, which possess a wide range of biological activities and relatively low toxicities.

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We developed a biotin-streptavidin-based sandwich ELISA for the sensitive and specific detection of Yersinia pestis. In this assay, the F1 capsular protein and Y. pestis were captured by anti-F1 mouse monoclonal antibody followed by detection with biotinylated-anti-F1 rabbit polyclonal antibody and HRP-conjugated streptavidin.

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In this study, several resveratrol analogs were synthesized and evaluated in search of a more effective anti-proliferative resveratrol analog. Among the evaluated resveratrol analogs, we have identified N-(4-methoxyphenyl)-3,5-dimethoxybenamide (MPDB) as a potent anti-proliferative compound. Treatment with MPDB resulted in G/M phase cell cycle arrest, which was accompanied by alteration of G/M-related protein expression and phosphorylation.

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Skeletal muscle atrophy is a condition characterized by damaged muscle fibers and reduced numbers of muscle cells due to various causes. Muscle atrophy is associated with chronic diseases, such as heart failure, diabetes, and aging-related diseases. Isobavachalcone (IBC) is a flavonoid found in various foods and natural products, and studies have investigated its diverse effects, including its neuroprotective and anticancer effects.

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