Treatment of aganglionic megacolon mice via neural stem cell transplantation

To explore a potential methodology for treating aganglionic megacolon, neural stem cells (NSCs) expressing engineered endothelin receptor type B (EDNRB) and glial cell-derived neurotrophic factor (GDNF) genes were transplanted into the aganglionic megacolon mice. After transplantation, the regeneration of neurons in the colon tissue was observed, and expression levels of differentiation-related genes were determined. Primary culture of NSCs was obtained from the cortex of postnatal mouse brain and infected with recombinant adenovirus expressing EDNRB and GDNF genes. The mouse model of aganglionic megacolon was developed by treating the colon tissue with 0.5 % benzalkonium chloride (BAC) to selectively remove the myenteric nerve plexus that resembles the pathological changes in the human congenital megacolon. The NSCs stably expressing the EDNRB and GDNF genes were transplanted into the benzalkonium chloride-induced mouse aganglionic colon. Survival and differentiation of the implanted stem cells were assessed after transplantation. Results showed that the EDNRB and GDNF genes were able to be expressed in primary culture of NSCs by adenovirus infection. One week after implantation, grafted NSCs survived and differentiated into neurons. Compared to the controls, elevated expression of EDNRB and GDNF was determined in BAC-induced aganglionic megacolon mice with partially improved intestinal function. Those founding indicated that the genes transfected into NSCs were expressed in vivo after transplantation. Also, this study provided favorable support for the therapeutic potential of multiple gene-modified NSC transplantation to treat Hirschsprung's disease, a congenital disorder of the colon in which ganglion cells are absent.