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. 1993 Apr;108(4):959–966. doi: 10.1111/j.1476-5381.1993.tb13492.x

Effect of dexamethasone on neutrophil accumulation and oedema formation in rabbit skin: an investigation of site of action.

H Yarwood 1, S Nourshargh 1, S Brain 1, T J Williams 1
PMCID: PMC1908135  PMID: 8387386

Abstract

1. The anti-inflammatory actions of dexamethasone on vascular and leukocyte responses in rabbit skin were investigated. 2. Neutrophil accumulation and oedema formation were simultaneously measured as the local accumulation of i.v. administered 111In-labelled neutrophils and 125I-labelled albumin. Systemically administered dexamethasone (3 mg kg-1) inhibited neutrophil accumulation induced by i.d. zymosan activated plasma (ZAP), N-formyl-methionyl-leucyl-phenylalanine (FMLP) and leukotriene B4 (LTB4) when co-injected with prostaglandin E2 (PGE2). Dexamethasone also inhibited oedema formation elicited by these stimuli and the responses induced by i.d. platelet activating factor (PAF)+PGE2 and bradykinin (BK)+PGE2. 3. Intradermal dexamethasone (2 x 10(-10) mol per site) but not indomethacin (10(-8) mol per site) inhibited oedema formation induced by i.d. ZAP+PGE2 and BK+PGE2. This inhibitory effect of dexamethasone was significant only with pretreatment periods of 4 h, shorter pretreatment periods resulting in greatly reduced effects. Intradermal dexamethasone had no effect on neutrophil accumulation induced by ZAP+PGE2. 4. Intradermal dexamethasone (2 x 10(-10) mol per site) had no effect on increase in blood flow induced by PGE2 as measured by 133Xenon clearance. 5. The accumulation of neutrophils isolated from donor rabbits pretreated with i.v. saline or dexamethasone (3 mg kg-1) was investigated in untreated recipient rabbits. The accumulation of neutrophils, induced by ZAP+PGE2, FMLP+PGE2 and LTB4+PGE2, from dexamethasone-pretreated donors was significantly smaller than the accumulation of neutrophils from saline-pretreated donors. 6. The results of this study suggest that dexamethasone can have a direct effect on vascular endothelial cells resulting in an inhibition of oedema formation.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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