Journal of Inflammation Research (Dec 2021)
Alterations of Asymmetric Dimethylarginine (ADMA)-Containing Protein Profiles Associated with Chronic Pancreatitis Pathogenesis
Abstract
Chaochao Tan,1 Yan Xiao,2 Xiangping Huang,1 Ling Wu,1 Ying Huang3 1Department of Clinical Laboratory, Hunan Provincial People’s Hospital (The First Affiliated Hospital of Hunan Normal University), Changsha, People’s Republic of China; 2Intensive Care Unit, Hunan Provincial People’s Hospital (The First Affiliated Hospital of Hunan Normal University), Changsha, People’s Republic of China; 3Department of Emergency, Hunan Provincial People’s Hospital (The First Affiliated Hospital of Hunan Normal University), Changsha, People’s Republic of ChinaCorrespondence: Ying HuangDepartment of Emergency, Hunan Provincial People’s Hospital (The First Affiliated Hospital of Hunan Normal University), 61 Jiefang Road, Changsha, Hunan, 410005, People’s Republic of ChinaTel +8613974858993Email [email protected]: The pathophysiological mechanisms of chronic pancreatitis (CP) still remain poorly understood. In this study, we aimed to characterize asymmetric dimethylarginine (ADMA)-containing proteins in pancreatic tissues and its relationship with CP pathogenesis.Methods: Totally 36 patients with CP were enrolled in this study. Seven other cholangiocarcinoma patients without pancreas involvements or patients with benign pancreatic tumors were included as the control group. Total proteins in human pancreatic tissues were digested by trypsin, and ADMA-containing peptides were enriched via immunoaffinity purification. The LC-MS/MS was performed to characterize ADMA-containing peptides and their modification sites in CP tissues. Relative asymmetric arginine dimethylation levels of HNRNPA3 proteins in human pancreatic tissues were detected by the immunoprecipitation combined with Western blot. The serum inflammatory factors were determined via the ELISA method.Results: A total of 134 ADMA sites in the control group and 137 ADMA sites in CP tissues were characterized by mass spectrometry, which belong to 93 and 94 ADMA-containing proteins in the control group and CP tissues, respectively. Glycine and proline residues were significantly overrepresented in the flanking sequences of ADMA sites. ADMA-containing proteins in the CP tissues were associated with various biological processes, especially the RNA metabolism and splicing pathways. Multiple protein members of the spliceosome pathway such as HNRNPA3 possess ADMA sites in the CP tissues. HNRNPA3 dimethylation levels were greatly increased in CP tissues, which were positively correlated with inflammatory factors.Conclusion: The pathogenesis of CP is associated with alterations of asymmetric arginine dimethylation in pancreatic tissues.Keywords: chronic pancreatitis, arginine methylation, ADMA, proteomics, HNRNPA3
