Hypersensitive cytokine response to beta-amyloid 25-35 in astroglial cells from IL-1 receptor type I-deficient mice.

Abstract:

:betaA25-35, a neurotoxic fragment of the Alzheimer beta-amyloid peptide (betaA), acts as a strong inducer of pro-inflammatory cytokines, such as interleukin (IL)-1 and IL-6, in glial cells. Since IL-1 is known to induce expression of both IL-1 and IL-6, we have investigated to what extent the induction of IL-1alpha and IL-6 by betaA25-35, is dependent on the IL-1 receptor type I (IL-1RI), the only known signalling IL-1 receptor. Primary astroglial cell cultures prepared from wild-type and IL-1RI-deficient mice were incubated in the presence of betaA25-35 (100 microM) for 19 h, followed by analysis of mRNA levels of IL-1alpha and IL-6. Cell cultures treated with betaA25-35 showed a significant increase in mRNA levels for IL-1alpha and IL-6 and in addition increased levels of IL-1alpha immunoreactivity. A supersensitive IL-1alpha response was observed in astroglial cell cultures lacking the IL-1 RI as compared to betaA25-35 treated cell cultures from wild-type mice. In contrast the betaA25-35-induced increase of IL-6 was lower in the absence of IL-1RI. In conclusion, these results suggest that a functional IL-1 signal transduction is not necessary for induction of mRNA levels of IL-1alpha and IL-6 in astroglial cell cultures treated with betaA25-35, but that induction of IL-6 involves at least two distinct mechanisms, one of which occurs via activation of the IL-1RI.

journal_name

Int J Mol Med

authors

Eriksson G,Zetterström M,Cortes Toro V,Bartfai T,Iverfeldt K

doi

10.3892/ijmm.1.1.201

subject

Has Abstract

pub_date

1998-01-01 00:00:00

pages

201-6

issue

1

eissn

1107-3756

issn

1791-244X

journal_volume

1

pub_type

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