Neuromodulation by a cytokine: interferon-beta differentially augments neocortical neuronal activity and excitability

Journal of Neurophysiology
Gergana HadjilambrevaUlf Strauss

Abstract

The immunomodulatory cytokine interferon-beta (IFN-beta) is used in the treatment of autoimmune diseases such as multiple sclerosis. However, the effect of IFN-beta on neuronal functions is currently unknown. Intracellular recordings were conducted on somatosensory neurons of neocortical layers 2/3 and 5 exposed to IFN-beta. The excitability of neurons was increased by IFN-beta (10-10,000 U/ml) in two kinetically distinct, putatively independent manners. First IFN-beta reversibly influenced the subthreshold membrane response by raising the membrane resistance R(M) 2.5-fold and the membrane time constant tau 1.7-fold dose-dependently. The effect required permanent exposure to IFN-beta and was reduced in magnitude if the extracellular K+ was lowered. However, the membrane response to IFN-beta in the subthreshold range was prevented by ZD7288 (a specific blocker of I(h)) but not by Ni2+, carbachol, or bicuculline, pointing to a dependence on an intact I(h). Second, IFN-beta enhanced the rate of action potential firing. This effect was observed to develop for >1 h when the cell was exposed to IFN-beta for 5 min or >5 min and showed no reversibility (< or =210 min). Current-discharge (F-I) curves revealed a shift (prevented by bicuc...Continue Reading

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Citations

Jan 13, 2005·European Archives of Psychiatry and Clinical Neuroscience·Michael TinnefeldPedro M Faustmann
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Jul 9, 2021·Molecular Psychiatry·Joana MagalhaesShohreh Issazadeh-Navikas

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