Synthesis of peptides by the solid-phase method. III. Bradykinin: fragments and analogs

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Abstract
The natural sequence of bradykinin (BK) and 55 fragments or analogs of this peptide were prepared via the solid-phase method. The peptides were purified using ion-exchange (O-carboxymethyl (CM)) and partition (Sephadex G-25) chromatography. The purity of each peptide was established by paper chromatography and TLC, paper electrophoresis, amino acid analysis and biological assays. The compounds were tested in anesthetized rats (test in vivo) and in 2 smooth-muscle preparations (rabbit aorta strip, cat ileum strip) in which BK produces contraction by stimulating specific receptors of different types. Some of the new peptides are interesting in that they either resist pulmonary inactivation, or are more potent than BK itself, or antagonize the myotropic effect of BK in rabbit aorta strips.