1. Karyopherin Alpha 2 Promotes the Inflammatory Response in Rat Pancreatic Acinar Cells Via Facilitating NF-κB Activation.
- Author
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Cai, Yongxia, Shen, Yanbo, Gao, Lili, Chen, Minmin, Xiao, Min, Huang, Zhongwei, and Zhang, Dongmei
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KARYOPHERINS , *PANCREATIC acinar cells , *NF-kappa B , *PROTEIN expression , *CELL imaging , *PANCREATITIS , *IMMUNOFLUORESCENCE , *ANIMAL models in research , *CELL metabolism , *PROTEIN metabolism , *RNA metabolism , *ANIMAL experimentation , *BIOCHEMISTRY , *BIOLOGICAL models , *CELL lines , *ENZYME-linked immunosorbent assay , *FLUORESCENT antibody technique , *GENES , *GENETIC techniques , *INFLAMMATION , *INTERLEUKINS , *PHENOMENOLOGY , *MEMBRANE proteins , *NITRIC oxide , *OLIGOPEPTIDES , *OXIDOREDUCTASES , *PANCREAS , *PHOSPHORYLATION , *POLYMERASE chain reaction , *PROTEINS , *RATS , *TRANSFERASES , *TUMOR necrosis factors , *WESTERN immunoblotting , *DNA-binding proteins , *REVERSE transcriptase polymerase chain reaction , *ACUTE diseases - Abstract
Background: Activation of the transcription factor NF-κB and expression of pro-inflammatory mediators have been considered as major events of acute pancreatitis (AP). Karyopherin alpha 2 (KPNA2), a member of the importin α family, reportedly modulates p65 subcellular localization.Aim: This study aimed to investigate the expression and possible functions of KPNA2 in the AP cell and animal model, focusing on its association with NF-κB activation.Methods: An AP cell model was established with the cerulein-stimulated AR42J and isolated rat pancreatic acinar cells. The AP rat model was induced by the intraperitoneal injection of cerulein. The secretion of TNF-α, IL-6, and LDH was detected by ELISA kits and the production of NO using nitric oxide kit. Expression of KPNA2 was measured by RT-PCR and Western blot. Expression levels of IKKα, phosphorylation of p65, and total p65 were detected by Western blot. Co-localization of KPNA2 with p65 was observed by immunofluorescence assay. To determine the biological functions of KPNA2 in cerulein-induced inflammatory response, RNA interference was employed to knockdown KPNA2 expression in AR42J and isolated pancreatic acini cells.Results: Cerulein stimulated KPNA2 expression and IL-6, TNF-α, NO, and LDH production in rat pancreatic acinar cells. Cerulein triggered the phosphorylation and nuclear translocation of NF-κB p65 subunit, indicating the NF-κB activation. The co-localization and nuclear accumulation of KPNA2 and p65 were detected in cerulein-treated cells. Knocking down KPNA2 hindered cerulein-induced nuclear transportation of p65 and alleviated the subsequent inflammatory response in rat pancreatic acinar cells. Additionally, KPNA2 expression was significantly up-regulated in cerulein-induced AP rat model.Conclusions: KPNA2-facilitated p65 nuclear translocation promotes NF-κB activation and inflammation in acute pancreatitis. [ABSTRACT FROM AUTHOR]- Published
- 2016
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