Abstract: Disclosed are a pharmaceutical composition for prevention or treatment of dry eye disease, including hyaluronan and proteoglycan link protein 1 (HAPLN1) as an active ingredient, and a method for preventing or treating dry eye disease by using same. According to the present disclosure, dry eye disease may be effectively and stably prevented or treated, and side effects are reduced as compared to conventional products.

Abstract: Disclosed in the present invention are: a pharmaceutical composition for preventing or treating fibrotic diseases, comprising hyaluronan and proteoglycan link protein 1 (HAPLN1) or a gene encoding same as an active ingredient; and a method for preventing or treating fibrotic diseases using the composition. According to the present invention, fibrosis of cells or tissues is prevented and inhibited such that the occurrence or progression of various kinds of diseases caused by fibrosis is fundamentally suppressed, and thus the diseases can be prevented or treated.

Abstract: The present invention relates to a pharmaceutical composition for preventing or treating hair loss, comprising hyaluronan and proteoglycan link protein 1 (HAPLN1) as an active ingredient. When administered, the HAPLN1 protein of the present invention grows hair by promoting the proliferation of hair germinal matrix cells through a Ras-ERK1/2 signaling pathway activated by a TGF-? protein.

Abstract: The present disclosure relates to HAPLN1 protein of an aged individual. The HAPLN1 protein exhibits reduced expression with aging, and when administered, its effect in alleviating and reversing skin aging including wrinkles is excellent. Therefore, by exploiting the difference in expression, provided are a biomarker composition for measuring skin aging, capable of diagnosing skin aging; a kit; and a method of screening for skin aging alleviating agents, comprising detecting the expression level of HAPLN1 protein or HAPLN1 gene. In addition, provided are a pharmaceutical composition, cosmetic composition, or health functional food for preventing or alleviating skin aging, and a cosmetic composition or health functional food for alleviating wrinkles, each containing any one or more selected from the group consisting of HAPLN1 protein, a gene encoding the same, and an effective agent for promoting the expression or activating the functions of HAPLN1 protein or gene.

Abstract: The present disclosure relates to HAPLN1 protein of an aged individual. The HAPLN1 protein exhibits reduced expression with aging, and when administered, its effect in alleviating and reversing skin aging including wrinkles is excellent. Therefore, by exploiting the difference in expression, provided are a biomarker composition for measuring skin aging, capable of diagnosing skin aging; a kit; and a method of screening for skin aging alleviating agents, comprising detecting the expression level of HAPLN1 protein or HAPLN1 gene. In addition, provided are a pharmaceutical composition, cosmetic composition, or health functional food for preventing or alleviating skin aging, and a cosmetic composition or health functional food for alleviating wrinkles, each containing any one or more selected from the group consisting of HAPLN1 protein, a gene encoding the same, and an effective agent for promoting the expression or activating the functions of HAPLN1 protein or gene.