To characterize internalization of NMDA-type glutamate receptors (GluRs) by antibodies to NMDA-type GluRs, we produced rabbit antibodies to N-terminals of human GluN1 and GluN2B, and examined internalization of NMDA-type GluRs in HEK293T cells using confocal microscopy. Internalization of NMDA-type GluRs occurred from at least 10 min after incubation with antibodies to GluN1 and or GluN2B and was temperature-dependent. These findings confirm that antibodies to N-terminals of GluN1 and GluN2B present in the cerebrospinal fluid of patients with NMDAR encephalitis can mediate prompt internalization of NMDA-type GluR complexes.
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