The non-depolarizing D-form of bromohomoibotenic acid enhances depolarizations evoked by the L-form or quisqualate.

U Madsen, B Ebert, J J Hansen, P Krogsgaard-Larsen

Index: Eur. J. Pharmacol. 230(3) , 383-6, (1993)

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Abstract

The D-enantiomer of bromohomoibotenic acid (Br-HIBO) was inactive in electrophysiological experiments when administered alone, but enhanced depolarizations evoked by L-Br-HIBO or quisqualate when co-administered with these agonists. In addition, quisqualate induced a long-lasting (> 120 min) sensitization of cortical wedge neurons to D-Br-HIBO. This latter effect of D-Br-HIBO was similar to, but significantly more potent and selective, than the earlier observed quisqualate-induced sensitization of cortical neurones to depolarization by (S)-2-amino-4-phosphonobutyric acid (L-AP4).