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and Tumor Necrosis Factor (TNF)-
By
From the Department of Neuroimmunology, Max-Planck-Institute for Psychiatry, D-82152
Martinsried, Germany
This study examined the effect of the pro-inflammatory cytokines interferon- All neurons transcribed the In contrast to IFN-
(IFN-
) and
tumor necrosis factor-
(TNF-
) on the induction of MHC class I-related genes in functionally mature brain neurons derived from cultures of dissociated rat hippocampal tissue. Patch
clamp electrophysiology combined with single cell RT-PCR demonstrated that ~50% of the
untreated neurons contained mRNA for MHC class I heavy chains, while, with few exceptions, the cells failed to transcribe
2-microglobulin and TAP1/TAP2 gene transcripts. No
constitutive expression of MHC class I protein was detectable by confocal laser microscopy on
the surface of neurons.
-chain of the interferon-type II receptor (binding IFN-
) along
with the p55 receptor for TNF-
. Sustained exposure to IFN-
resulted in transcription of
2microglobulin and TAP1/TAP2 genes and MHC class I surface expression in a minor part of
the neurons, but did not alter their electrophysiological activities as assessed by whole cell electrophysiology. Suppression of neuronal electric activity by the sodium channel blocker tetrodotoxin drastically increased to almost 100% IFN-
-mediated induction of MHC class I chains,
of both TAP transporters, and of membrane expression of MHC class I protein. The effect of
tetrodotoxin is at least partly reverted by the neurotransmitter glutamate.
, treatment with TNF-
did neither upregulate TAP1/TAP2 nor
2microglobulin gene expression, but induced MHC class I heavy chain gene transcription in all
neurons. Consequently, no MHC class I molecules were detectable on the membranes of
TNF-
-treated neurons.
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