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. 1979 Mar;65(3):465–472. doi: 10.1111/j.1476-5381.1979.tb07852.x

Time-dependent stimulatory and inhibitory effects of prostaglandin E1 on exudative and tissue components of granulomatous inflammation in rats

IL Bonta, MJ Parnham
PMCID: PMC1668632  PMID: 427320

Abstract

1 The effects of prostaglandin (PGE1), following local administration during different phases of developing sponge-induced granulomata, were studied in normal and essential fatty acid deficient (EFAD) rats.

2 In normal rats, a single dose of 1 μg PGE1 on implantation (day 1) increased exudate production without altering total leucocyte counts after 6 h and stimulated granulomatous tissue formation after 8 days.

3 Repeated daily administration of the same dose of PGE1 on days 1 to 3 had no effect, while administration on days 4 to 7 (i.e. when tissue growth is already in progress) inhibited granuloma formation.

4 In EFAD rats, which are known to produce only very small amounts of endogenous prostaglandins, acute (6 h) exudate formation was unaffected by 0.05 μg PGE1. However, early stimulatory and later inhibitory effects of 0.05 μg PGE1 per day were obtained on the granulomatous tissue, similar to those obtained with the 20 fold higher dose in normal rats.

5 The early stimulatory action of PGE1 on granulomatous tissue formation was enhanced, in normal rats, by concomitant administration of 10 μg theophylline. This latter compound did not influence the later inhibitory effect of PGE1.

6 These results indicate that PGE1 exerts either pro- or anti-inflammatory actions on the proliferative (tissue) component of the inflammatory process, depending on the time of administration. While the stimulatory effect following early administration may have been secondary to an initial cyclic adenosine 3′,5′-monophosphate-mediated, vascular response, such a mechanism is unlikely to have been responsible for the later anti-inflammatory action of PGE1.

7 The implications of these results are discussed in relation to the postulated negative-feedback role of endogenous PGE in chronic inflammation.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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