[EN] METHODS AND COMPOSITIONS COMPRISING GUANIDINES FOR TREATING BIOFILMS [FR] MÉTHODES ET COMPOSITIONS COMPRENANT DES GUANIDINES DESTINÉS AU TRAITEMENT DE BIOFILMS
[EN] METHODS AND COMPOSITIONS COMPRISING GUANIDINES FOR TREATING BIOFILMS [FR] MÉTHODES ET COMPOSITIONS COMPRENANT DES GUANIDINES DESTINÉS AU TRAITEMENT DE BIOFILMS
The present invention relates to a nasally administrable composition of a physiologically active cyclic peptide and pharmaceutically acceptable salts thereof that is prepared by homogeneously dispersing a physiologically active cyclic peptide such as antifungal cyclic peptides (aerothricins, echinocandin analogs, pneumocandin analogs, and aureobacidines), antibacterial cyclic peptides (e.g. vancomycin, daptomycin), cyclosporin A, lanreotide, vapreotide, vasopressin antagonist (U.S. Pat. No. 5,095,003) and eptifibatide in unique carrier, i.e. a physiologically acceptable powdery or crystalline carrier containing a water insoluble polyvalent metal carrier, or organic carrier having a mean particle size of 20 to 500 &mgr;m, in the presence or absence of an absorption enhancer and by homogeneously adsorbing onto the carrier, and its use for therapeutic treatment of disease such as systemic fungal infections by intranasal administration.
The composition can be nasally administered in powder form.
Biofilms are often associated with human bacterial infections, and the natural tolerance of biofilms to antibiotics challenges treatment. Compounds with anti-biofilm activity could become useful adjuncts to antibiotic therapy. We used norspermidine, a natural trigger for biofilm disassembly in the developmental cycle of Bacillus subtilis, to develop guanidine and biguanide compounds with up to 20-fold increased potency in preventing biofilm formation and breaking down existing biofilms. These compounds also were active against pathogenic Staphylococcus aureus. An integrated approach involving structure activity relationships, protonation constants, and crystal structure data on a focused synthetic library revealed that precise spacing of positively charged groups and the total charge at physiological pH distinguish potent biofilm inhibitors.