Inhibition of Smooth Muscle Contraction and Platelet Aggregation by Peptide 204-212 of Lipocortin 5: an Attempt to Define Some Structure Requirements

Overview

Journal Mediators Inflamm

Publisher Wiley

Specialties Biochemistry
Pathology

Date 1993 Jan 1

PMID 18475510

Authors

K G Mugridge

C Becherucci

L Parente

M Perretti

Affiliations

Soon will be listed here.

Abstract

Peptide 204-212 of lipocortin (LC) 5 inhibited porcine pancreatic phospholipase A(2) (PLA(2)) induced rat stomach strip contractions and ADP induced rabbit platelet aggregation in a concentration dependent manner (IC(30) of 10 muM and 400 muM, respectively). The first two amino acids are not necessary since the eptapeptide 206-212 was equipotent in both assays (IC(30) of 12.5 muM and 420 muM). Of the two pentapeptides 204-208 and 208-212 only the latter showed inhibitory activity in both models although the potency was much reduced (IC(30) of 170 muM and 630 muM) compared with that of the parent nonapeptide. Comparison of peptide 204-212 effects with those of its analogues on LC1 and LC2 indicate that lysine 208 and aspartic acid 211 are essential in order to maintain a fully active nonapeptide.

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