Abstract: The present invention has multiple aspects. In its first aspect, it is directed to a compound that is a 4(S)-fluoro-thio-tripeptide analog that has the unexpectedly superior property of specifically inhibiting the enzyme, membrane-bound aminopeptidase P2 (APP2), whose natural substrate is bradykinin, but not the enzyme angiotensin converting enzyme (ACE) which also cleaves bradykinin. In its second aspect, the present invention is directed to a pharmaceutical composition comprising the 4(S)-fluoro-thio-tripeptide analog and a pharmaceutically acceptable carrier. In its third aspect, the invention is directed to a method of inhibiting bradykinin degradation in a mammalian patient, comprising administering a therapeutically effective amount of the compound of the invention to a mammalian patient in need of inhibition of bradykinin degradation.

Abstract: The present invention is directed to an ? thio-containing compound that is capable of inhibiting the enzyme, membrane aminopeptidase P (mAPP or APP), whose natural substrate is bradykinin. The compound is useful as a pharmaceutical agent because by inhibiting bradykinin degradation, the compound allows bradykinin to exert its beneficial effects on the cardiovascular system, to improve renal function, and to improve glucose tolerance and insulin-sensitivity. The present invention is also directed to a pharmaceutical composition comprising the mAPP inhibitor of the present invention and a pharmaceutically acceptable carrier. In another aspect, the present invention is directed to a method of inhibiting bradykinin degradation in a mammalian patient, preferably human, in need of treatment comprising administering to the patient a therapeutically effective amount of an ? thio-containing compound of the present invention.

Abstract: The present invention is directed to a compound of the formula: ##STR1## or a pharmaceutically acceptable addition salt thereof, wherein C.sup.3 and C.sup.2 in combination have the configuration S,R or R,S;wherein Y is straight or branched chain lower alkyl having 1 to 6 carbon atoms, straight or branched chain lower alkenyl or alkynyl having 2-6 carbon atoms, cyclic alkyl or alkenyl having 5 or 6 carbon atoms, or benzyl; andwherein X is an amino acid or an oligopeptide having from 1 to 8 amino acid residues, the first amino acid residue at the N-terminus of X being a natural or a synthetic L-amino acid having a radius of gyration of less than 1.54 .ANG., X also having a carboxyl or a carboxyamide moiety at its carboxy terminus. The present invention is further directed to a pharmaceutical composition and to a method of inhibiting bradykinin degradation in a patient using the above-described compound.