Oxytocin receptors in non-human primate brain visualized with monoclonal antibody

The identity of putative oxytocin receptors visualized in autoradiographic studies of primate brain is unclear because the ligand used is much less se lective in primate than rodent brains. This study tests the feasibility of utilizing a new monoclonal antibody (MoAb) developed against human uterine OTRs to visualize OTRs in primate brain. A block containing ventral hypotha lamus of cynomolgus macaque brain, paraformaldehyde, glutaraldehyde-fixed a nd paraffin-embedded, and positive control tissue (human endometrium) were sectioned at 8 mum and studied with immunohistochemistry. OTRs were located in fibers in septal nucleus and in both cell bodies and fibers of preoptic area. These results indicate that OTRs in primate brain may be visualized with this MoAb, and are located in primate brain sites linked to the regula tion of social behavior. NeuroReport 12:1723-1726 (C) 2001 Lippincott Willi ams & Wilkins.