RT-PCR and an in situ hybridization analyses demonstrated expression of prostaglandin EP2 receptor mRNA in the subfield of the dorsal horn of the rat spinal cord. The intensive signals from the cells labeled with digoxigenin-11-dUTP were scattered through this region and they corresponded to neurons. EP2 receptor-mediated signal transduction is expected to play roles in modulating some neuronal functions such as transmission of nociceptive reaction or motor reflex.