Compositions for external application, containing adenosylcobalamin for improvement of skin diseases

Abstract

The present invention relates to a composition for external application for improving a skin disease (e.g. psoriasis). The composition contains adenosylcobalamin (coenzyme B12), optionally in admixture with other cobalamins. The composition can be present in the form of liposomal preparations, which are made of a phospholipid and cholesterol.

What is claimed is: 
     
         1 . A method of treating atopic dermatitis comprising applying to a skin of a subject in need of such treatment an effective amount of an external composition comprising adenosylcobalamin as an active ingredient which is embedded in a liposome comprising a phospholipid and cholesterol. 
     
     
         2 . The method of  claim 1 , wherein the composition comprises 0.01-7 wt % of adenosylcobalamin based on the total weight of the composition. 
     
     
         3 . The method of  claim 1 , wherein the composition further comprises an active ingredient selected from the group consisting of methylcobalamin, hydroxocobalamin, cyanocobalamin, and mixtures thereof. 
     
     
         4 . The method of  claim 1 , wherein the composition further comprises a steroid, vitamin or immunosuppressive drug. 
     
     
         5 . The method of  claim 1 , wherein the weight ratio of the phospholipid and the cholesterol is 1-10:1. 
     
     
         6 . The method of  claim 1 , wherein the phospholipid is a phosphocholine having 3-24 carbons in diacyl group. 
     
     
         7 . The method of  claim 6 , wherein the phospholipid is selected from the group consisting of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine, 1,2-disteroyl-sn-glycero-3-phosphocholine, L-a-phosphatidyl choline, 1-palmitoyl-2-glutaroyl-sn-glycero-3-phosphocholine, 1,2-dilauroyl-sn-glycero-3-phosphocholine, 1,2-dimyristoyl-sn-glycero-3-phosphocholine, 1,2-dioleyl-sn-glycero-3-phosphocholine and mixtures thereof. 
     
     
         8 . The method of  claim 1 , wherein the composition comprises 50-500 weight parts of a surfactant with a C8-C16 alkyl group relative to one weight part of the active ingredient. 
     
     
         9 . The method of  claim 8 , wherein the surfactant is a lauryl ether based compound or poly(ethylene oxide) based compound. 
     
     
         10 . The method of  claim 9 , wherein the lauryl ether based compound is one selected from the group consisting of isopropyl myristate, sodium lauryl sulfate, propylene glycol monolaurate, monolaurin, monostearin, monoolein, monomyristin, lauryl alcohol, polyoxyethylene lauryl ether and mixtures thereof. 
     
     
         11 . The method of  claim 9 , wherein the poly(ethylene oxide) based compound is one selected from the group consisting of pluronic, sorbitan monopalmitate, sorbitan trioleate, and mixtures thereof. 
     
     
         12 . The method of  claim 1 , wherein the composition is formulated into a preparation selected from the group consisting of a hydrogel, emulsion cream, ointment, solution, suspension, plaster, water containing plaster, skin lotion and lotion. 
     
     
         13 . The method of  claim 12 , wherein the composition is formulated into the hydrogel. 
     
     
         14 . A composition for external application for the treatment of skin diseases, the composition comprising adenosylcobalamin as an active ingredient which is embedded in a liposome comprising a phospholipid and cholesterol.