TY - JOUR
T1 - Quantification of neuroreceptors in the living human brain
T2 - IV. Effect of aging and elevations of D2-like receptors in schizophrenia and bipolar illness
AU - Wong, Dean F.
AU - Pearlson, Godfrey D.
AU - Tune, Larry E.
AU - Young, L. Trevor
AU - Meltzer, Carolyn Cidis
AU - Dannals, Robert F.
AU - Ravert, Hayden T.
AU - Reith, Jakob
AU - Kuhar, Michael J.
AU - Gjedde, Albert
PY - 1997/3
Y1 - 1997/3
N2 - In a previous study of 10 drug-naive schizophrenic patients, the density of D2 dopamine receptors was found to be elevated in the caudate nucleus. The study raised questions about the influence of the age of the patients, the relationship of receptor density to psychosis, and the accuracy of the method used to obtain this evidence. Using positron emission tomography and constrained analysis of the brain uptake of the radioligand N- [11C]methylspiperone ([11C]NMSP), we tested four questions: Were the assumptions underlying the quantitation valid? Is there an age decline of the density of D2-1ike dopamine receptors in drug-naive schizophrenia and bipolar illness? If so, is it different from that observed in normal aging'? Are D2-like dopamine receptors elevated at any age in either drug-naive schizophrenic or psychotic bipolar illness patients? NMSP and haloperidol partition volumes and plasma protein fractions were not significantly different among patient groups and normal volunteers. The model-derived assay of radioligand metabolites in plasma was confirmed by high-performance liquid chromatography in the patient groups. D2-like dopamine receptors declined with age, and the slope did not differ significantly between the schizophrenic patients, bipolar affective illness patients, and normal controls. Taking the effect of age into account, increases in D2 dopamine receptor density were found in seven psychotic patients with bipolar affective illness compared with seven nonpsychotic patients and 24 control subjects as well as in 22 drug-naive schizophrenic patients compared with the 24 control subjects.
AB - In a previous study of 10 drug-naive schizophrenic patients, the density of D2 dopamine receptors was found to be elevated in the caudate nucleus. The study raised questions about the influence of the age of the patients, the relationship of receptor density to psychosis, and the accuracy of the method used to obtain this evidence. Using positron emission tomography and constrained analysis of the brain uptake of the radioligand N- [11C]methylspiperone ([11C]NMSP), we tested four questions: Were the assumptions underlying the quantitation valid? Is there an age decline of the density of D2-1ike dopamine receptors in drug-naive schizophrenia and bipolar illness? If so, is it different from that observed in normal aging'? Are D2-like dopamine receptors elevated at any age in either drug-naive schizophrenic or psychotic bipolar illness patients? NMSP and haloperidol partition volumes and plasma protein fractions were not significantly different among patient groups and normal volunteers. The model-derived assay of radioligand metabolites in plasma was confirmed by high-performance liquid chromatography in the patient groups. D2-like dopamine receptors declined with age, and the slope did not differ significantly between the schizophrenic patients, bipolar affective illness patients, and normal controls. Taking the effect of age into account, increases in D2 dopamine receptor density were found in seven psychotic patients with bipolar affective illness compared with seven nonpsychotic patients and 24 control subjects as well as in 22 drug-naive schizophrenic patients compared with the 24 control subjects.
KW - Bipolar illness
KW - D dopamine receptors
KW - Dopamine
KW - Dopamine receptors
KW - Positron emission tomography
KW - Psychosis
KW - Receptor quantification
KW - Schizophrenia
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U2 - 10.1097/00004647-199703000-00010
DO - 10.1097/00004647-199703000-00010
M3 - Article
C2 - 9119906
AN - SCOPUS:0030889598
SN - 0271-678X
VL - 17
SP - 331
EP - 342
JO - Journal of Cerebral Blood Flow and Metabolism
JF - Journal of Cerebral Blood Flow and Metabolism
IS - 3
ER -