Effect of MRS5980 and linaclotide on visceral pain induced by DNBS in female rats. Effect of MRS5980 (0.3, 1.2, and 2.4 μmol·kg−1; i.p.) and linaclotide (0.2 nmol·kg−1 p.o.) on visceromotor response (VMR, A) to CRD on day 14 after DNBS injection. Effect of MRS5980 (0.3, 1.2, and 2.4 μmol·kg−1; i.p.) on abdominal withdrawal reflex (AWR, B) to CRD on day 14 after DNBS injection. Each value is the mean ± SEM of 6 rats per group. ^^P < 0.01 vs vehicle-treated normal controls (violet). *P < 0.05 and **P < 0.01 vs DNBS + vehicle-treated group (red). CRD, colorectal distension.