Publications by authors named "Da-Yeong Nam"

Various substances, including collagen (Naticol®) and ascorbic acid, that inhibit and prevent skin aging have been studied. Collagen prevents skin aging, has anti-inflammatory effects, and assists in normal wound healing. Ascorbic acid is a representative antioxidant that plays a role in collagen synthesis.

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The skin tissue of the scalp is unique from other skin tissues because it coexists with hair, and many differences in microbial composition have been confirmed. In scalp tissues, hair loss occurs due to a combination of internal and external factors, and several studies are being conducted to counteract this. However, not many studies have addressed hair loss from the perspective of the microbiome.

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Skin photoaging occurs due to chronic exposure to solar ultraviolet radiation (UV), the main factor contributing to extrinsic skin aging. Clinical signs of photoaging include the formation of deep, coarse skin wrinkles and hyperpigmentation. Although melanogenesis and skin wrinkling occur in different skin cells and have different underlying mechanisms, their initiation involves intracellular calcium signaling via calcium ion channels.

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In traditional Korean/Asian medicine, Salvia plebeia R.Br. () leaves are used to treat inflammatory diseases, including dermatitis, cough, asthma and toothache.

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High mobility group box 1 (HMGB1), a late phase cytokine of sepsis, is viewed as a potential target for the treatment of sepsis. The authors considered that 13-methylberberine (13-MB) might reduce circulating HMGB1 levels and increase survival in a mouse model of sepsis by activating AMP-activated protein kinase (AMPK). Western blot analysis and vascular contraction testing were performed using RAW264.

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Article Synopsis
  • UV irradiation significantly contributes to photoageing, leading to skin issues like wrinkles and hyperpigmentation, primarily through its role in melanogenesis.
  • Tyrosinase is a key enzyme involved in melanin production, and many skin whitening agents aim to inhibit its activity or expression, while the ORAI1 calcium channel is also linked to UV-induced melanogenesis.
  • A study found that methanolic extracts of guava leaves effectively inhibit both tyrosinase and ORAI1, with certain fractions showing promising results in reducing melanin production in response to UVB exposure in melanoma cells.
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Article Synopsis
  • UV radiation triggers inflammation and immune responses in skin, with calcium ion channels like TRPV1 and ORAI1 playing roles in skin conditions such as pigmentation and wrinkles.
  • Research on Cyperus rotundus, known for treating inflammatory diseases, evaluates its effects on these ion channels and finds that valencene from this plant significantly inhibits their activity.
  • The study reveals that valencene reduces melanin production in melanoma cells after UV exposure, suggesting potential uses in therapies for UV-induced skin damage and photoaging.
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