3 years ago

The Serum Protein Renalase Reduces Injury in Experimental Pancreatitis.

Christine Shugrue, Shang-Lin Chung, Kimie Date, Vikhil Patel, Fred S Gorelick, Gary V Desir, Anamika M Reed, Thomas R Kolodecik
Acute pancreatitis is a disease associated with inflammation and tissue damage. One protein that protects against acute injury, including ischemic injury to both the kidney and heart, renalase, which is secreted into the blood by the kidney and other tissues. However, whether renalase reduces acute injury associated with pancreatitis is unknown. Here, we used both in vitro and in vivo murine models of acute pancreatitis to study renalase effects on this condition. In isolated pancreatic lobules, pretreatment with recombinant human renalase (rRNLS) blocked zymogen activation caused by cerulein, carbachol, and a bile acid. Renalase also blocked cerulein-induced cell injury and histological changes. In the in vivo cerulein model of pancreatitis, genetic deletion of renalase resulted in more severe disease, and administering rRNLS to cerulein-exposed WT mice after pancreatitis onset was protective. Because pathological increases in acinar cell cytosolic calcium levels are central to the initiation of acute pancreatitis, we also investigated whether rRNLS could function through its binding protein, calcium ATPase 4b (PMCA4b), which excretes calcium from cells. We found that PMCA4b is expressed in both murine and human acinar cells and that a PMCA4b selective inhibitor worsens pancreatitis-induced injury and blocked the protective effects of rRNLS. These findings suggest that renalase is a protective plasma protein that reduces acinar cell injury through a plasma membrane calcium ATPase. Since exogenous rRNLS reduces the severity of acute pancreatitis, it has the potential as a therapeutic agent.

Publisher URL: http://doi.org/10.1074/jbc.M117.789776

DOI: 10.1074/jbc.M117.789776

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