Abstract: The present invention relates to a composition for preventing or treating cellular senescence-associated diseases comprising homoharringtonine as an active ingredient, and it was confirmed that the composition comprising homoharringtonine as an active ingredient exhibits a senolytics effect of selectively killing aging-induced fibroblasts and renal tubular cells, whereas aging-induced vascular endothelial cells and epithelial melanocytes and retinal pigmented epithelial cells, and exhibits a senomorphics effect of restoring the function and morphology of cells, and thus the homoharringtonine acts differently depending on the type of cells to effectively prevent or treat senile eye disease, tissue fibrosis disease, atherosclerosis, osteoarthritis, degenerative brain disease, chronic skin damage, obesity and diabetes caused by cellular aging and can be provided as a composition for whitening skin and life extension.

Abstract: Disclosed are: a lightening composition comprising ginseng-derived exosome-like vesicles; and a method for producing the ginseng-derived exosome-like vesicles. The ginseng-derived exosome-like vesicles may have a diameter of between 20 and 500 nm, and may be isolated from ginseng root. Because the composition comprises the ginseng-derived exosome-like vesicles as an active ingredient, said composition is effective in preventing, improving or treating skin pigmentation conditions such as liver spots, freckles, lentigo, birth marks and melanoma by effectively suppressing the production of melanin.

Abstract: Disclosed in the present specification are: a skin whitening composition having a skin whitening effect by controlling the secretion of exosomes to be secreted from melanocytes; and a method for screening for materials having a skin whitening effect. The skin whitening composition can promote apoptosis of melanocytes by inhibiting the amount of secretion of exosomes to be secreted from melanocytes, and consequently inhibits the generation of melanin through the apoptosis of melanocytes, thereby exhibiting a skin whitening effect.

Abstract: The present invention relates to novel melanocytes and melanoblasts. In addition, the present invention relates to a novel method for producing melanocytes and melanoblasts. Specifically, provided is novel melanocytes of which gene expression, melanin content, and tyrosinase activity are different from those of conventional melanocytes. Even more specifically, provided is novel melanoblasts of which the gene expression, the melanin content the tyrosinase activity, and the protein expression are different from those of conventional melanocytes. Additionally, provided is a novel method for producing melanocytes or melanoblasts by culturing keratinocytes.

Abstract: Disclosed are: a lightening composition comprising ginseng-derived exosome-like vesicles; and a method for producing the ginseng-derived exosome-like vesicles. The ginseng-derived exosome-like vesicles may have a diameter of between 20 and 500 nm, and may be isolated from ginseng root. Because the composition comprises the ginseng-derived exosome-like vesicles as an active ingredient, said composition is effective in preventing, improving or treating skin pigmentation conditions such as liver spots, freckles, lentigo, birth marks and melanoma by effectively suppressing the production of melanin.

Abstract: Disclosed in the present specification are: a skin whitening composition having a skin whitening effect by controlling the secretion of exosomes to be secreted from melanocytes; and a method for screening for materials having a skin whitening effect. The skin whitening composition can promote apoptosis of melanocytes by inhibiting the amount of secretion of exosomes to be secreted from melanocytes, and consequently inhibits the generation of melanin through the apoptosis of melanocytes, thereby exhibiting a skin whitening effect.

Abstract: Disclosed is a composition for a whitening effect or for the prevention of gray hair, which includes antisense nucleic acid molecules of SEQ ID NO: 2, wherein the composition has an miRNA of SEQ ID NO: 1 or a base sequence complementary thereto. Also disclosed is a method for controlling chromogenesis in test materials and for screening for expression control materials of chromogenic genes. The composition and the screening methodcan be used for the whitening effect or for the prevention of gray hair.

Abstract: The present invention relates to novel melanocytes and melanoblasts. In addition, the present invention relates to a novel method for producing melanocytes and melanoblasts. Specifically, provided is novel melanocytes of which gene expression, melanin content, and tyrosinase activity are different from those of conventional melanocytes. Even more specifically, provided is novel melanoblasts of which the gene expression, the melanin content the tyrosinase activity, and the protein expression are different from those of conventional melanocytes. Additionally, provided is a novel method for producing melanocytes or melanoblasts by culturing keratinocytes.

Abstract: Disclosed is a composition for a whitening effect or for the prevention of gray hair, which includes antisense nucleic acid molecules of SEQ ID NO: 2, wherein the composition has an miRNA of SEQ ID NO: 1 or a base sequence complementary thereto. Also disclosed is a method for controlling chromogenesis in test materials and for screening for expression control materials of chromogenic genes. The composition and the screening method can be used for the whitening effect or for the prevention of gray hair.