Publications by authors named "Hae-Young Chung"

Background: This study explored the impact of discrepancies between Body Mass Index (BMI) and Subjective Body Image Perception (SBIP) on metabolic health indicators, physical activity (PA), sedentary behavior (SB), sleep time (ST), and stress levels in Korean adults.

Methods: Data from 8,634 participants in the 8th Korea National Health and Nutrition Examination Survey (KNHANES, 2019-2021) were analyzed. Participants were categorized into three groups: Group A (SBIP = BMI), Group B (SBIP < BMI), and Group C (SBIP > BMI).

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Parkinson's disease (PD) is a neurodegenerative disorder characterized by the loss of dopaminergic neurons due to oxidative stress and inflammation. Targeting inflammation and oxidative stress offers a promising means of slowing PD progression. Taurine, a naturally occurring amino sulfonic acid, has demonstrated potent antioxidant properties, thereby preventing cell death.

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Aging is associated with a decline in liver function, which increases the risk of age-related metabolic disorders. Calorie restriction (CR) counteracts age-related changes in the liver; however, the underlying molecular mechanism remains elusive. In this study, we integrated transcriptomic, bioinformatic, and molecular analyses to investigate the effects of aging and CR on age-related gene expression in the rat liver, focusing on the interplay between the circadian rhythm and lipid metabolism.

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Aging leads to deterioration of the liver and kidney. Metabolic research on aging organs, including liver and kidney and metabolic studies of caloric restriction (CR), which delay aging and extends lifespan, are not well understood. In this study, we monitored metabolic changes associated with aging and explored potential biomarkers in kidney and liver of young (Y, 8 months), old (O, 23 months), and old calorie-restricted (OCR, 23 months) rats by metabolic profiling of organic acids (OA), free fatty acids (FFA), amino acids (AA) using gas chromatography-tandem mass spectrometry.

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The 2,4-dihydroxyphenyl group is commonly present in the chemical structures of potent tyrosinase inhibitors. Based on this observation, a series of 6-(substituted phenyl)-[1,3]dioxolo[4',5':4,5]benzo[1,2-]thiazole compounds - were designed and synthesized as potential tyrosinase inhibitors. Among these, compounds and strongly inhibited mushroom tyrosinase activity.

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Parkinson's disease (PD) is a progressive neurodegenerative disorder characterized by dopaminergic neuron loss and resultant severe motor dysfunction. While current treatments primarily focus on maintaining dopamine levels, effective targeting of neuroinflammation, an important driver of disease progression, remains an unmet need. This study investigates the neuroprotective potential of BMDA (BMDA(N-benzyl-N-methyldecan-1-amine)), a natural compound derived from garlic with strong anti-inflammatory properties, using an MPTP (1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine)-induced mouse model of PD.

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To discover novel anti-melanogenic compounds with tyrosinase inhibitory activity, -3-benzyl-5-benzylidene-2-thioxothiazolidin-4-one (-BBTT) analogs -, designed based on the hybrid structure of a β-phenyl-α,β-unsaturated carbonyl motif and a 3-benzyl-2-thioxothiazolidin-4-one scaffold, were synthesized as novel tyrosinase inhibitors. Of the 12 analogs, 2 ( and ) showed mushroom tyrosinase inhibitory activity similar to that of kojic acid, a representative tyrosinase inhibitor, and 3 analogs (-) exhibited mushroom tyrosinase inhibitory activity that was more potent than that of kojic acid. In particular, analog revealed highly potent inhibition with an IC value of 90 nM, which was 214 times lower than that of kojic acid (IC value = 19.

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Chronic kidney disease (CKD) involves ongoing impairment of kidney function and structural changes. Previous studies indicated that males have a substantially higher prevalence of CKD than those observed in females. Here, we compared the gender differences in CKD development by comparing age-matched male and female mice subjected to a 0.

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Fifteen compounds (-) constructed on a hybrid structure combining a β-phenyl-α,β-unsaturated carbonyl template and a 2-aminothiazol-4(5)-one scaffold were designed and synthesized as potential novel anti-tyrosinase substances. Two compounds ( and ) showed more potent inhibition against mushroom tyrosinase than kojic acid, and the inhibitory activity of (IC value: 1.60 μM) was 11 times stronger than that of kojic acid.

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Libosch., which belongs to the Orobanchaceae family, is a perennial herb found in China, Japan, and Korea. In traditional medicine, it is used to cool the body, improve water metabolism in the kidney, and provide protection from metabolic diseases such as type 2 diabetes mellitus (T2DM) and obesity.

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Leveille is a traditional medicine used to treat migraine headache and dysmenorrhea. In this study, three polyacetylenes, methyl (10,9,16)-16-acetoxy-9-hydroxyoctadeca-10,17-dien-12,14-diynoate (), methyl (10,9,16)-9,16-dihydroxyoctadeca-10-en-12,14-diynoate (), and methyl (10,9,16)-9,16-dihydroxyoctadeca-10,17-dien-12,14-diynoate (), were isolated from the aerial parts of . , together with seven known compounds (-).

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Monosodium glutamate (MSG) is a widely used flavor enhancer in processed foods and valued for its ability to enhance the savory taste known as umami. MSG is classified as non-toxic and recognized as a safe food additive with no specific usage restrictions in many countries. However, neurotoxic studies on MSG have primarily focused on neurons, and the effects of MSG on neural stem cells (NSCs) have not been reported.

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2-Mercaptomethylbenzo[]imidazole (2-MMBI) derivatives were designed and synthesized as tyrosinase (TYR) chelators using 2-mercaptomethylimidazole scaffolds. Seven of the ten 2-MMBI derivatives exhibited stronger inhibition of mushroom TYR activity than kojic acid. Their ability to chelate copper ions was demonstrated through experiments using the copper chelator pyrocatechol violet and assays measuring TYR activity in the presence or absence of exogenous CuSO.

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Obesity is recognized as a significant contributor to the onset of kidney disease. However, the key processes involved in the development of kidney disease in obese individuals are not well understood. Here, we investigated the effects of high-fat diet (HFD)-induced obesity on folic acid (FA)-induced kidney injury in mice.

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Article Synopsis
  • - Senoinflammation is a persistent low-grade inflammatory process linked to aging, affecting multiple organs and contributing to systemic degeneration and age-related diseases.
  • - The review includes biochemical evidence that supports the involvement of senoinflammation in metabolic dysfunction and the development of the senescence-associated secretory phenotype (SASP), which worsens with age.
  • - Calorie restriction (CR) has shown promising anti-inflammatory effects, reducing harmful substances related to senoinflammation and representing a potential strategy for targeting aging and age-related diseases.
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Article Synopsis
  • * Resorcinol-containing compounds showed significantly better mushroom tyrosinase inhibition compared to kojic acid, with one compound achieving a remarkable IC value of 0.51 μM.
  • * These compounds not only inhibited tyrosinase activity and melanin production effectively in cell tests but also demonstrated strong depigmentation in zebrafish larvae without causing toxicity, indicating their safety for use on skin.
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  • 8-Prenylgenistein (8PG), a compound from fermented soybeans, shows benefits for bone health and fat reduction, but its liver-protective effects had not been thoroughly studied before this research.
  • The study revealed that 8PG strongly interacts with two proteins, AMPK and SIRT1, which help prevent fat buildup in the liver and promote fat burning.
  • 8PG not only improved the mechanism by enhancing AMPK activation but also showed promise as a dietary option to combat metabolic liver diseases without causing cancer in rats.
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  • Calorie restriction (CR) can be good for health, but it might make kidney problems worse when there’s injury.
  • In experiments with mice, those on a CR diet showed more kidney damage and inflammation after being given a special drug than those not on the diet.
  • The study suggests that CR changes how energy is used in the kidneys, which can increase inflammation and kidney scarring instead of helping it heal.
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Based on the hypothesis that the 2-mercaptoacetamide moiety chelates the copper ions of tyrosinase, 2-mercapto--arylacetamide (2-MAA) analogs were designed and synthesized as potential tyrosinase inhibitors. Four 2-MAA analogs showed low IC values ranging from 0.95 to 2.

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Background: Aging is a progressive process characterized by weakness in brain function. Although metabolomics studies on the brain related with aging have been conducted, it is not yet fully understood. A systematic metabolomics study was performed to search for biomarkers and monitor altered metabolism in various brain tissues of the cortex, cerebellum, hypothalamus, and hippocampus of young (8 months old) and old rats (22 months old).

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Tyrosinase is a metalloenzyme that contains copper(II) ions. We designed and synthesized eight known low-molecular-weight 2-mercaptobenzoxazole (2-MBO) analogs as tyrosinase inhibitors. Our focus was on the mercapto functional group, which interacts with copper ions.

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Article Synopsis
  • Compounds with sulfhydryl groups and azole structures, like 2-thiobenzothiazole (2-TBT), show strong potential to inhibit the enzyme tyrosinase, which is linked to melanin production.
  • Eight out of ten synthesized 2-TBT derivatives effectively inhibited tyrosinase's activity, significantly impacting melanogenesis in specific cell lines and outperforming traditional inhibitors like kojic acid in experimental models.
  • The mechanisms of action suggest that these derivatives work by binding to the active site of tyrosinase, potentially offering a new approach for treating hyperpigmentation disorders.
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Article Synopsis
  • Researchers developed benzylidene-3-methyl-2-thioxothiazolidin-4-one (BMTTZD) analogs to target and inhibit tyrosinase, an enzyme involved in melanin production.
  • Some of these analogs showed significantly stronger inhibition than the common treatment, kojic acid, especially in the presence of l-tyrosine and l-dopa.
  • The analogs also demonstrated strong antioxidant effects and reduced melanin production in cell experiments, indicating their potential use in treating hyperpigmentation disorders.
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  • Cellular senescence, a process where cells stop dividing and can cause inflammation, contributes to kidney diseases by releasing harmful substances.
  • Protease-activating receptor 2 (PAR2) plays a significant role in this inflammation, but its connection to cellular senescence in kidneys was not well understood until this study.
  • The research showed that activating PAR2 leads to cellular senescence in kidney cells, and mice without PAR2 were less affected by kidney damage, suggesting that targeting PAR2 could help treat kidney injuries.
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  • FoxO6 is a factor that increases fat in the blood and liver when we get older by raising levels of a protein called ApoC3.
  • In experiments with older rats and mice, higher levels of FoxO6 led to more fat buildup in their liver when they ate a high-fat diet or had high sugar levels.
  • When FoxO6 was removed, the mice had less fat in their liver and lower fat in the blood, showing how important FoxO6 is in causing these problems, especially in older animals.
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