Abstract:
:There is increasing evidence that a functional interaction exists between interleukin-1beta (IL-1beta) and N-methyl-D-aspartate (NMDA) receptors. The present study attempted to elucidate the effect of IL-1beta on the NMDA-induced outward currents in mechanically dissociated hippocampal neurons using a perforated patch recording technique. IL-1beta (30-100 ng/ml) inhibited the mean amplitude of the NMDA-induced outward currents that were mediated by charybdotoxin (ChTX)-sensitive Ca(2+)-activated K(+) (K(Ca)) channels. IL-1beta (100 ng/ml) also significantly increased the mean ratio of the NMDA-induced inward current amplitudes measured at the end to the beginning of a 20-s application of NMDA. In hippocampal neurons from acute slice preparations, IL-1beta significantly inhibited ChTX-sensitive K(Ca) currents induced by a depolarizing voltage-step. IL-1 receptor antagonist antagonized effects of IL-1beta. These results strongly suggest that IL-1beta increases the neuronal excitability by inhibition of ChTX-sensitive K(Ca) channels activated by Ca(2+) influx through both NMDA receptors and voltage-gated Ca(2+) channels.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Zhang R,Yamada J,Hayashi Y,Wu Z,Koyama S,Nakanishi Hdoi
10.1016/j.bbrc.2008.05.128subject
Has Abstractpub_date
2008-08-08 00:00:00pages
816-20issue
4eissn
0006-291Xissn
1090-2104pii
S0006-291X(08)01052-8journal_volume
372pub_type
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