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The Journal of Neuroscience, November 1, 2000, 20(21):7964-7971

Tumor Necrosis Factor  Induces a Metalloprotease-Disintegrin, ADAM8 (CD 156): Implications for Neuron-Glia Interactions during Neurodegeneration

Uwe Schlomann¹, Silvia Rathke-Hartlieb¹, Shunsuke Yamamoto², Harald Jockusch¹, and Jörg W. Bartsch¹

¹ Developmental Biology and Molecular Pathology, University of Bielefeld, 33615 Bielefeld, Germany, and ² Department of Pathology, Oita Medical University, Hasama-machi, Oita 879-55, Japan

ADAM proteases, defined by extracellular disintegrin and metalloprotease domains, are involved in protein processing and cell-cell interactions. Using wobbler (WR) mutant mice, we investigated the role of ADAMs in neurodegeneration and reactive glia activation in the CNS. We found that ADAM8 (CD 156), a suspected leukocyte adhesion molecule, is expressed in the CNS and highly induced in affected CNS areas of WR mice, in brainstem and spinal cord. ADAM8 mRNA and protein are found at low levels throughout the normal mouse CNS, in neurons and oligodendrocytes. In the WR CNS regions in which neurodegeneration occurs, ADAM8 is induced in neurons, reactive astrocytes, and activated microglia. Similarly, the proinflammatory cytokine tumor necrosis factor  (TNF-) is upregulated and shows the same cellular distribution. In primary astrocytes from wild-type and WR mice, in primary cerebellar neurons, and in mouse motoneuron-like NSC19 cells, ADAM8 expression was induced up to 15-fold by mouse TNF-, in a dose-dependent manner. In both cell types, ADAM8 was also induced by human TNF-, indicating that TNF receptor type I (p55) is involved. Induction of ADAM8 mRNA was suppressed by treatment with an interferon-regulating factor 1 (IRF-1) antisense oligonucleotide. We conclude that IRF-1-mediated induction of ADAM8 by TNF- is a signaling pathway relevant for neurodegenerative disorders with glia activation, proposing a role for ADAM8 in cell adhesion during neurodegeneration.

Key words: metalloprotease-disintegrins; neurodegeneration; reactive gliosis; cell adhesion; ADAM8 (CD 156); tumor necrosis factor ; TNF-; IRF-1

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Copyright © 2000 Society for Neuroscience  0270-6474/00/20217964-08$05.00/0

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