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Norepinephrine and vasoactive intestinal peptide induce IL-6 secretion by astrocytes: synergism with IL-1 beta and TNF alpha.

Abstract：

:Resident glial cells and invading inflammatory cells are responsible for cytokine production within the brain. Astrocytes are known to secrete a variety of cytokines upon stimulation with cytokines themselves, protein kinase C activators, bacterial or viral constituents. Astrocytes also have surface receptors for a wide number of neurotransmitters and neuropeptides and some of these substances affect astrocyte immune functions, such as major histocompatibility complex (MHC) class II antigen expression. To elucidate the activity of neuromediators on cytokine secretion by glial cells, we studied the secretion of interleukin-6 (IL-6) by cultured rat astrocytes after incubation with various neurotransmitters and neuropeptides. Norepinephrine (NE) and the beta-adrenergic agonist isoproterenol (IPT) induced IL-6 secretion in a dose-dependent fashion. NE effect was predominantly mediated by beta 2-adrenergic receptors with a minor contribution of alpha 1-adrenergic receptors. The induction of IL-6 release by dibutyryl-cAMP indicated that IL-6 secretion secondary to beta 2-adrenergic receptor activation probably occurs through cAMP signalling pathways. Vasoactive intestinal peptide (VIP) was the sole neuropeptide able to induce IL-6 secretion. NE and VIP promoted IL-6 mRNA synthesis and both substances synergized with interleukin-1 beta (IL-1 beta) and tumor necrosis factor alpha (TNF alpha) in inducing IL-6 release. Our findings provide further evidence that neurons modulate astrocyte cytokine production and thereby regulate central nervous system immune functions.

journal_name

J Neuroimmunol

journal_title

Journal of neuroimmunology

authors

Maimone D,Cioni C,Rosa S,Macchia G,Aloisi F,Annunziata P

doi

10.1016/0165-5728(93)90286-8

subject

Has Abstract

pub_date

1993-08-01 00:00:00

pages

73-81

issue

1

eissn

0165-5728

issn

1872-8421

pii

0165-5728(93)90286-8

journal_volume

47

pub_type

杂志文章

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