NADH protect against radiation enteritis by enhancing autophagy and inhibiting inflammation through PI3K/AKT pathway

American Journal of Translational Research

Wen-Quan Xie¹  Fa-Quan Liu²  Jin-Ting Wang³ 

[1] Department of Gastroenterology, The Fifth Affiliated Hospital of Southern Medical University, Guangzhou 510900, China;Department of Radiology, Division of Radiobiology, The Ohio State University Wexner Medical Center, Columbus, OH, USA;Oncology Center, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, China

关键词: NADH;    radiation enteritis;    autograph;    inflammation;    PI3K/AKT pathway;   

DOI  :  

学科分类：医学（综合）

来源: e-Century Publishing Corporation

【 摘 要 】

Radiotherapy is an important method for cancer treatment but it has serious side-effects at high doses. One of the greatest challenges in radiotherapy is that radiation affects both healthy tissue and cancer tissues. For abdominal or pelvic lesions, the bowel is the most easily injured by irradiation. Radiation may cause radiation enteritis, intestinal inflammatory infiltration, or intestinal perforation. Coenzyme NADH involves in energy metabolism and transportation of nucleic acid, proteins and carbohydrates. In our study, NADH was used to protect the intestinal wall from irradiation injury in IEC-6 normal intestinal epithelial cells. By flow cytometry, we found that NADH can inhibit the cell death and the producing of reactive oxygen species (ROS). The immunofluorescence assay showed that cell autophagy was increased in the NADH group. Western blot data indicated that NADH promoted the microtubule associated protein 1A/1B-light chain 3(LC3)-I to LC3II and the expression of IL-1β and TNFα decreased in a dose dependent manner. Interestingly, a specific PI3K/AKT inhibitor (3MA) decreased the expression of inflammatory factors. In the animal experiment, after 12 Gy radiation, there were less TNFα and more LC3II in the RT+NADH group than that of RT group. Compared with the mock, there was no significant damage in the NADH group. Thus, our study provides the evidence that NADH may protect against radiation enteritis by suppressing inflammation and enhancing autophagy through PI3K/AKT pathway in normal intestinal cells.

【 授权许可】

CC BY-NC