Intercellular adhesion molecule-1 suppression in skin by topical delivery of anti-sense oligonucleotides

We topically applied 20 nucleotide phosphorothioate intercellular adhesion molecule-1 anti-sense oligodeoxynucleotide in a cream formulation. It effec tively inhibited tumor necrosis factor-alpha -induced expression of interce llular adhesion molecule-1 in human skin transplanted on severe compromised immunodeficient mice. The effects were concentration dependent, sequence s pecific, and resulted from reduction of intercellular adhesion molecule-1 m RNA levels in the skin. Intravenous administration of the drug did not show pharmacologic effects, probably due to insufficient drug concentrations in skin. Topical delivery, however, produced a rapid and a significantly high er accumulation of oligodeoxynucleotide in the epidermis and dermis. The re sults strongly suggest that topically applied anti-sense oligonucleotides c an be delivered to target sites in the skin and may be of considerable valu e in the treatment of psoriasis and other inflammatory skin disorders.