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Adrenaline suppression of the macrophage nitric oxide response to lipopolysaccharide is associated with differential regulation of tumour necrosis factor-alpha and interleukin-10.

Abstract：

:Adrenaline is a catecholamine hormone secreted by the adrenal medulla in response to acute stress. Previous studies have shown that adrenaline suppresses the nitric oxide (NO) response of murine macrophages (M phi s) stimulated in vitro with lipopolysaccharide (LPS). We have now extended these studies to examine the effects of adrenaline on the production of tumour necrosis factor alpha (TNF-alpha) and interleukin-10 (IL-10). Our results showed that NO, TNF-alpha and IL-10 were concurrently produced following in vitro LPS (10 micrograms/ml) stimulation of murine peritoneal M phi s. Adrenaline suppressed both NO and TNF-alpha with concomitant up-regulation of the IL-10 response above that seen with LPS alone. In this in vitro model of LPS stimulation we demonstrated that TNF-alpha was required for NO production, as the TNF-alpha neutralizing monoclonal antibody, TN3.19.12, abolished the response; in contrast, IL-10 suppressed NO. In order to determine any functional consequence of adrenaline-mediated IL-10 augmentation on NO production, M phi s were stimulated with LPS and specific neutralizing anti-IL-10 antibodies were added to the cultures. The LPS NO response was suppressed to 43% of the control value by adrenaline (10(-8) M) and an irrelevant control antibody had no effect on the adrenaline-mediated inhibition of NO, but anti-IL-10 treatment restored the NO response to levels similar to those observed with LPS alone. Furthermore, we demonstrated that exogenous TNF-alpha, at a dose range of 1.9-50 ng per ml, also restored the nitrite response to LPS in the presence of adrenaline. Together, the observations that neutralization of IL-10 and addition of TNF-alpha abrogate adrenaline's inhibition of NO, suggest that this hormone suppresses NO partly through up-regulation of IL-10 which, in turn, may suppress TNF-alpha that is required for NO production. Finally, we also observed that the M phi-activating cytokine, interferon-gamma (IFN-gamma), attenuated the inhibitory effect of adrenaline on the LPS NO response.

journal_name

Immunology

journal_title

Immunology

authors

Zinyama RB,Bancroft GJ,Sigola LB

doi

10.1046/j.1365-2567.2001.01332.x

keywords:

subject

Has Abstract

pub_date

2001-12-01 00:00:00

pages

439-46

issue

4

eissn

0019-2805

issn

1365-2567

journal_volume

104

pub_type

杂志文章

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