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Quantification of mu and non–mu opiate receptors in temporal lobe epilepsy using positron emission tomography
Author(s) -
Mayberg Helen S.,
Sadzot Bernard,
Meltzer Carolyn Cidis,
Fisher Robert S.,
Lesser Ronald P.,
Dannals Robert F.,
Lever John R.,
Wilson Alan A.,
Ravert Hayden T.,
Wagner Henry N.,
Bryan R. Nick,
Cromwell Christina C.,
Frost J. James
Publication year - 1991
Publication title -
annals of neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.764
H-Index - 296
eISSN - 1531-8249
pISSN - 0364-5134
DOI - 10.1002/ana.410300103
Subject(s) - diprenorphine , temporal lobe , neocortex , epilepsy , opiate , positron emission tomography , neuroscience , medicine , endocrinology , anesthesia , agonist , chemistry , receptor , psychology , opioid receptor
Alterations in a variety of neurotransmitter systems have been identified in experimental models of epilepsy and in brain tissue from patients with intractable temporal lobe seizures. The availability of new high‐affinity radioligands permits the study of some neuroreceptors in vivo with positron emission tomography (PET). We previously characterized the in vivo binding of 11 C‐carfentanil, a potent and selective mu opiate receptor agonist, and described increases in 11 C‐carfentanil binding in the temporal neocortex of patients with unilateral temporal lobe epilepsy. These studies have been extended to 11 C‐diprenorphine, which labels mu, kappa, and delta opiate receptor subtypes. Paired measurements of opiate receptor binding were performed with PET using 11 C‐carfentanil and 11 C‐diprenorphine in patients with unilateral temporal lobe seizures. Carfentanil binding, reflecting changes in mu opiate receptors, was increased in the temporal neocortex and decreased in the amygdala on the side of the epileptic focus. Diprenorphine binding, reflecting mu as well as non–mu opiate subtypes, was not significantly different among regions in the focus and nonfocus temporal lobes. Regional glucose metabolism, measured using 18 F‐2‐fluoro‐2‐deoxyglucose, was decreased in the mesial and lateral aspects of the temporal lobe ipsilateral to the epileptogenic focus. The variation in pattern of carfentanil and diprenorphine binding supports a differential regulation of opiate subtypes in unilateral temporal lobe epilepsy.