Urocortin mRNA is expressed in the enteric nervous system of the rat.

The expression of the urocortin gene in the gastrointestinal tract was investigated using reverse transcription polymerase chain reaction (RT-PCR) and in situ hybridization histochemistry. PCR demonstrated the presence of urocortin mRNA in the rat brain, duodenum, small intestine, and colon. By in situ hybridization, urocortin-containing cells were exclusively localized to the submucosal plexus and myenteric plexus in the duodenum, small intestine and colon. These results suggest that urocortin may play an important role in the regulation of gastrointestinal motor function throughout the enteric nervous system.