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Sunlight exposure contributes to human health; however, excessive light exposure to skin, especially ultraviolet B (UV-B), can produce high amounts of reactive oxygen species (ROS) and induce inflammation. Some antioxidants, such as squalene, can prevent UV-B-induced inflammation. C₃₄H₅₈ botryococcene is the most common triterpene hydrocarbon produced by green alga Botryococcus braunii; it is biosynthesized via a pathway similar to squalene and appears to have a similar chemical structure to squalene. However, there are no reports on the bioactivity of botryococcene. In this study, we evaluated that botryococcene can prevent the skin photoaging. Using ESR assay, botryococcene could not scavenge any ROS. However, treatment of epidermis cells with the botryococcene significantly suppressed intracellular ROS production by hydrogen peroxide (H₂O₂) and attenuated H₂O₂ cytotoxicity. Botryococcene enhanced the antioxidant enzymes in gastric cells, thus botryococcene may scavenge ROS indirectly, not directly. Moreover, botryococcene inhibited production of intracellular interleukin-1 and exhibited suppression of melanogenesis activity by UV-B irradiation. Addition of botryococcene-treated epidermal cells culture medium mitigated the increase in matrix metalloproteinase-1 production and the decrease in type I collagen production induced by UV-B irradiation in dermis cells. These results showed that botryococcene has anti-photoaging effects, including preventing wrinkles and blemishes on the skin. Full article

A person’s quality of life can be adversely affected by hair loss. Microalgae are widely recognized for their abundance and rich functional components. Here, we evaluated the hair growth effect of a green alga, Botryococcus terribilis (B. terribilis), in vitro using hair follicle dermal papilla cells (HFDPCs). We isolated two types of cells from B. terribilis—green and orange cells, obtained from two different culture conditions. Microarray and real time-PCR results revealed that both cell types stimulated the expression of several pathways and genes associated with different aspect of the hair follicle cycle. Additionally, we demonstrated B. terribilis’ effect on collagen and keratin synthesis and inflammation reduction. We successfully isolated a novel compound, methylated-meijicoccene (me-meijicoccene), and C32 botryococcene from B. terribilis to validate their promising effects. Our study revealed that treatment with the two compounds had no cytotoxic effect on HFDPCs and significantly enhanced the gene expression levels of hair growth markers at low concentrations. Our study provides the first evidence of the underlying hair growth promoting effect of B. terribilis and its novel compound, me-meijicoccene, and C32 botryococcene. Full article