Original Article Differential expression of FOXA1, DUSP6, and HA117 in colon segments of Hirschsprung's disease

Objective: To describe the expression profiles of FOXA1, DUSP6, and HA117 in different portions of the colon of patients diagnosed with Hirschsprung's disease (HSCR). Methods: Colon specimens were collected from34 HSCR patients and grouped into 3 segments: proximal anastomosis, dilated segment and stenotic segment. Levels of FOXA1, DUSP6, and HA117 RNA were evaluated by real-time PCR. Levels of FOXA1 and DUSP6 protein were analyzed by immunohistochemistry and Western blotting. Results: The levels of FOXA1 and DUSP6 RNA were sig- nificantly lower in the stenotic segment compared to proximal anastomosis ( P < 0.05). The level of HA117 RNA was significantly higher in the stenotic segment compared to proximal anastomosis ( P < 0.05). In proximal anastomosis, FOXA1 and DUSP6 were both expressed at the protein level in ganglion cells and nerve fibers between the circular and longitudinal muscles. In the stenotic segments, positive staining for FOXA1 and DUSP6 was diminished. The lev- els of FOXA1 and DUSP6 protein were significantly lower in the stenotic segment compared to proximal anastomosis (P < 0.05). Conclusion: Suppression of the FOXA1/DUSP6 signaling pathway may contribute to the development of HSCR. LncRNA HA117 may have an anti-differentiation function, and play a pivotal role in the progression of HSCR.