[EN] NOVEL PLASMA PROTEIN AFFINITY TAGS<br/>[FR] NOUVELLES ETIQUETTES D'AFFINITE POUR LES PROTEINES PLASMIQUES
申请人:NOVO NORDISK AS
公开号:WO2005028516A2
公开(公告)日:2005-03-31
The present invention relates to a new drug delivery system, based on novel compounds with high affinity to plasma proteins (= affinity tags). These affinity tags can be linked to therapeutically active compounds and thereby enhance their half-life in plasma by reversible binding to plasma proteins.The present invention intends to provide a versatile delivery system for therapeutic agents, such as proteins, peptides, or small molecule drugs, by covalently binding these therapeutic agents to a plasma-protein ligand, capable of reversible binding to one or several plasma proteins. We have designed a novel linking strategy which enables the covalent binding of known, plasma-protein binding carboxylic acids to a broad variety of therapeutic peptides or proteins, or to any other type of compound, of which a prolonged periferal exposure at well-defined concentrations is required. This strategy consists in converting said plasma-protein binding carboxylic acid into a carboxylic acid mimetic, having a pKa between -5 and +7, in order to be ionized to a significant extent in plasma. Such a carboxylic acid mimetic could be, for instance, an N-acylsulfbnamide, which contains an additional functional group which enables covalent binding of the acid mimetic to a therapeutic agent. This linking strategy should not significantly disturb the structure of the plasma-protein binding acid, if a suitable acid mimetic has been chosen. The present invention álso relates to a compound of the general formula (II), wherein R1, G, Z, X, and Y are defined as described. The present invention also relates to pharmaceutical compositions comprising a compound according to the present invention and the use of compounds according to the present invention for preparing medicaments for treating disease.