Abstract: Disclosed are ceramide derivatives represented by the following formula 1 or 2, a method for preparing the same, and a therapeutic agent for treating atopic dermatitis including the ceramide derivatives as active ingredients: wherein, R1 and R2 are each independently straight or branched alkyl groups having 4 to 22 carbon atoms. The therapeutic agent for treating atopic dermatitis including the ceramide derivatives as active ingredients according to the present invention may be useful to treat atopic dermatitis, or treat other skin diseases that are required for improving skin inflammations or suppressing epidermal proliferation, by suppressing or improving inflammatory conditions in the atopic dermatitis in addition to giving immunoregulatory functions, and suppressing or improving skin disorders, for example epidermal proliferation that is generally observed in the atopic dermatitis.

Abstract: Disclosed are ceramide derivatives represented by the following formula 1 or 2, a method for preparing the same, and a therapeutic agent for treating atopic dermatitis including the ceramide derivatives as active ingredients: wherein, R1 and R2 are each independently straight or branched alkyl groups having 4 to 22 carbon atoms. The therapeutic agent for treating atopic dermatitis including the ceramide derivatives as active ingredients according to the present invention may be useful to treat atopic dermatitis, or treat other skin diseases that are required for improving skin inflammations or suppressing epidermal proliferation, by suppressing or improving inflammatory conditions in the atopic dermatitis in addition to giving immunoregulatory functions, and suppressing or improving skin disorders, for example epidermal proliferation that is generally observed in the atopic dermatitis.

Abstract: Disclosed is a skin external preparation containing stratum corneum intercellular lipids, ceramide, and having a hexagonal gel structure. More particularly, the skin external preparation having the hexagonal gel structure contains, as stratum corneum intercellular lipid components, ceramide and cholesterol or its derivative and/or fatty acid, and as an emulsifying agent, sorbitan stearate, sucrose cocoate or a mixture thereof. The hexagonal gel structure of the external preparation is in the same form as a lamellar structure formed by stratum corneum intercellular lipids on the actual skin, and this lamellar structure plays a very important role in skin protection and moisturizing functions, and thus provides very useful effects for skin showing a damaged skin barrier function in various skin diseases or various skin types.

Abstract: Disclosed is a non-natural ceramide compound effective for a sphingosine kinase activator, and thus useful for a skin disease treating agent. The sphingosine kinase activator enhances production of sphingosine-1-phosphate to show various physiological activities provided by sphingosine-1-phosphate. The physiological activities include the effects of: controlling multiplication and differentiation of keratinocytes, multiplication of fibroblasts and collagen synthesis, resulting in treatment of wounds, recovery of damaged skin functions in atopic dermatitis and psoriasis; inhibiting wrinkles and skin irritation caused by ultraviolet rays, followed by improvement of wrinkles and inhibition of skin aging; and reducing skin atrophy, which is a typical side effect of local application steroids.