A comparison of M1 and M4 muscarinic receptors in the thalamus from control subjects and subjects with schizophrenia

Abstract

Having shown a decrease in muscarinic M1 receptors in Brodmann's area (BA) 9 from subjects with schizophrenia we have extended our studies to determine if this receptor is decreased in the thalamus from the same cohort of subjects. Levels of [3H] pirenzepine binding to and mRNA encoding for M1 and M4 receptors were measured throughout the thalamus. Levels of M1 and M4 receptor proteins were measured in the mediodorsal nucleus. Two-way ANOVA revealed a variance in [3H]pirenzepine binding (F=4.69, d.f. = 1.190, P=0.03), but there was no significant change in radioligand binding in any thalamic region in schizophrenia. Neither levels of mRNA encoding the thalamic M1 or M4 receptor nor levels of..