title: Charged liposomes as carriers to enhance the permeation through the skin.
abstract: BACKGROUND
  In recent years, there has been increased interest in developing charged liposomes as carriers for transdermal drug delivery. It is necessary to modify the basic composition of the liposomes in order to enhance the penetration properties of the vesicles through the skin. Charged liposomes offer several advantages compared with previous drug delivery systems.
  
  
  METHODS
  This paper provides a brief overview of the different drug delivery systems that exist which aim to improve the permeation of drugs through the skin, focusing on the use of charged liposomes for transdermal delivery. We propose a classification of such liposomes based on the origin of the charge given to the vesicles.
  
  
  CONCLUSIONS
  Despite the advances that are occurring in the design of charged liposomes for transdermal drug delivery, the long-term stability continues to be a drawback in such systems. The presence of charge on the surface of the vesicles favors the electrostatic repulsion among them, creating a ζ potential positive or negative that prevents their aggregation and flocculation. However, there is loss of the encapsulated drug, which limits the in vivo use of these systems. It should be emphasized that charged liposomes are indeed a promising candidate for use in gene therapy and vaccine targeting, in a great diversity of diseases, for which drugs are administered by the percutaneous route.
authors.affiliation: University of Seville, Department of Pharmaceutical Technology, Prof. García González, 2. 41012 Seville, Spain. malugoro@us.es
authors.forename: M L
authors.initials: ML
authors.lastname: González-Rodríguez
authors.forename: A M
authors.initials: AM
authors.lastname: Rabasco
mesh_terms: D000279:Administration, Cutaneous; D004337:Drug Carriers; D006801:Humans; D008081:Liposomes; D010539:Permeability; D012869:Skin Absorption
chemical_list: D004337:Drug Carriers; D008081:Liposomes