| 摘要 |
Cyclopeptides of formula (I), their salts and individual enantiomers or diastereomers are new: Cyclo(Arg-A-Asp-R1-R2) is (I); A is Gly or Ala; R1 is 2-carboxy-8-amino-4-thiapiperolidine-9-one (Btd); o-aminomethyl-o'-carboxybiphenyl (Biph); 2-aminomethyl-5-carboxymethyl-thiophene (Act); 6-aminohexanoic acid (Aha); 2-(1,7-diazaspiro(4,4)-nonan-7-yl)-4-methylpentanoic acid ((S,S)spiro-Pro-Leu); or 2-(3-amino-1-pyrrolide-2-onyl)-4-methylpentanoic acid ((S) or (R)Gly(ANC-2)-Leu) all these residues being bonded via peptide links; R2 is absent or is Val. (I) are inhibitors of integrins, esp. they inhibit interaction between beta 3 or beta 5 integrin receptors and ligands. They are useful, in human or veterinary medicine, for treatment or prevention of:(a) diseases of the circulation or bone (e.g. thrombosis, cardiac infarct, arteriosclerosis, inflammation, apoplexy, angina, osteoporosis, etc.) or (b) tumours. (I) also have antiviral and antimicrobial activity, e.g. for use as disinfectants for implants, catheters, etc. (I) can also be used to prepare immobilised ligands for purificn. of integrins by affinity chromatography. Dosage: 0.01-2 mg/kg/day, given orally, rectally, by injection or locally. |
