DARPP-32, a dopamine and cyclic AMP-regulated phosphoprotein, is present in corticothalamic neurons of the rat cingulate cortex.
DARPP-32 immunocytochemistry and retrograde axonal labeling were combined to determine whether DARPP-32-containing neurons of the rat anterior cingulate cortex project to thalamus. Following injections of fluorescent latex microspheres into the mediodorsal thalamic nuclei, a large proportion of the DARPP-32 immunostained neurons in layer VI were also retrogradely labeled. In area 24a, these neurons were mostly found in layer VIb, whereas in area 24b, they were visible throughout layer VI. The presence of DARPP-32 in certain corticothalamic neurons suggests that these cells may be modulated by dopamine, which increases DARPP-32 phosphorylation, and possibly by glutamate, which antagonizes DARPP-32 phosphorylation via the N-methyl-D-aspartate (NMDA) receptor.
Ouimet
C C
CC
Psychology Department, Florida State University, Tallahassee 32306.
D000818:Animals; D001370:Axonal Transport; D051937:Dopamine and cAMP-Regulated Phosphoprotein 32; D006179:Gyrus Cinguli / Q000033:anatomy & histology* / Q000166:cytology; D007150:Immunohistochemistry; D008297:Male; D009419:Nerve Tissue Proteins / Q000032:analysis*; D009474:Neurons / Q000166:cytology*; D010750:Phosphoproteins / Q000032:analysis*; D051381:Rats; D011919:Rats, Inbred Strains; D013788:Thalamus / Q000033:anatomy & histology* / Q000166:cytology
D051937:Dopamine and cAMP-Regulated Phosphoprotein 32; D009419:Nerve Tissue Proteins; D010750:Phosphoproteins