A novel peptide delivery system involving peptidase activated prodrugs as antimicrobial agents. Synthesis and biological activity of peptidyl derivatives of 5-fluorouracil
摘要:
As an approach to the development of antimicrobial agents, a novel peptide carrier system was designed, based on the chemical instability of alpha-substituted glycine analogues, with the explicit intent of actively transporting therapeutically useful compounds into microbial cells. Peptides containing 5-fluorouracil (5-FU) linked to the peptide backbone were selected to test the feasibility of this new delivery system. These peptide conjugates were designed such that they would be substrates for both the microbial peptide permeases and peptidases. After entry into cells, enzymatic hydrolysis of the peptide generates an unstable alpha-(5-FU)-glycine that spontaneously decomposes to release 5-FU. The 5-FU-peptide conjugates were tested for antifungal (Candida albicans) and antibacterial (Escherichia coli) activity and were found to have antimicrobial activities comparable to free 5-FU. Noninhibitory peptides antagonized the antimicrobial activities of the 5-FU-peptide conjugates but not of free 5-FU, a result consistent with peptide transport mediated entry of the peptide conjugates into cells. Further support for this conclusion was provided by the finding that biological activities were dependent upon peptide stereochemistry.
Prodrugs are described whose structures have a oligopeptide chain which is substituted by a nucleophilic chemotherapeutic residue at the a-position. The products have increased cell membrane permeability and beneficial physico-chemical properties.
所述原药的结构是在 a 位被亲核化疗残基取代的低聚肽链。这些产品具有更高的细胞膜渗透性和有益的物理化学特性。
MEDICINAL PREPARATIONS
申请人:KYOWA HAKKO KOGYO CO., LTD.
公开号:EP1142589A1
公开(公告)日:2001-10-10
The present invention provides a pharmaceutical preparation comprising a compound which can be obtained by reacting a compound having a free amino group with a sugar having the reducing power. The preparation is capable of improving the in vivo durability of various compounds and releasing the compounds in response to changes in pH, and thus is useful for causing the compounds to act specifically on target parts.