Insulin protects acinar cells during pancreatitis by preserving glycolytic ATP supply to calcium pumps

Jason I. E. Bruce (), Rosa Sánchez-Alvarez, Maria Dolors Sans, Sarah A. Sugden, Nathan Qi, Andrew D. James and John A. Williams
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Jason I. E. Bruce: The University of Manchester
Rosa Sánchez-Alvarez: The University of Manchester
Maria Dolors Sans: University of Michigan
Sarah A. Sugden: The University of Manchester
Nathan Qi: University of Michigan
Andrew D. James: The University of Manchester
John A. Williams: University of Michigan

Nature Communications, 2021, vol. 12, issue 1, 1-17

Abstract: Abstract Acute pancreatitis (AP) is serious inflammatory disease of the pancreas. Accumulating evidence links diabetes with severity of AP, suggesting that endogenous insulin may be protective. We investigated this putative protective effect of insulin during cellular and in vivo models of AP in diabetic mice (Ins2Akita) and Pancreatic Acinar cell-specific Conditional Insulin Receptor Knock Out mice (PACIRKO). Caerulein and palmitoleic acid (POA)/ethanol-induced pancreatitis was more severe in both Ins2Akita and PACIRKO vs control mice, suggesting that endogenous insulin directly protects acinar cells in vivo. In isolated pancreatic acinar cells, insulin induced Akt-mediated phosphorylation of 6-phosphofructo-2-kinase/fructose-2,6-biphosphatase 2 (PFKFB2) which upregulated glycolysis thereby preventing POA-induced ATP depletion, inhibition of the ATP-dependent plasma membrane Ca2+ ATPase (PMCA) and cytotoxic Ca2+ overload. These data provide the first mechanistic link between diabetes and severity of AP and suggest that phosphorylation of PFKFB2 may represent a potential therapeutic strategy for treatment of AP.

Date: 2021
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DOI: 10.1038/s41467-021-24506-w

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