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• W2064688360 abstract "Congenital pancreatic triglyceride lipase (PNLIP) deficiency is a rare disorder with uncertain genetic background as most cases were described before gene sequencing was readily available. Recently, two brothers with PNLIP deficiency were found to carry a homozygous missense mutation, c.662C > T (p.T221M) in the PNLIP gene (J. Lipid Res. 2014. 55:307–312). Molecular modeling suggested the substitution would change the orientation of residues in the catalytic site and disrupt the function of p.T221M PNLIP. To test the effect of the p.T221M mutation on PNLIP function, we expressed wild-type and p.T221M PNLIP in human embryonic kidney (HEK) 293A cells and dexamethasone-differentiated AR42J rat acinar cells. In both cellular models, wild-type PNLIP was secreted into the conditioned medium where it was readily detectable by protein staining, immunoblot or lipase activity assays. In contrast, mutant p.T221M was not secreted into the medium, but it was present in cell lysates where it accumulated in the insoluble fraction. Intracellular retention of mutant p.T221M resulted in endoplasmic reticulum (ER) stress as measured by elevated XBP1 splicing and increased levels of ER chaperones. Our results demonstrate that the presence of methionine at position 221 in the PNLIP protein sequence causes misfolding and aggregation of the p.T221M mutant inside the cell. The consequent loss of enzyme secretion adequately explains the clinical phenotype of PNLIP deficiency reported for homozygous carriers of p.T221M. Furthermore, the ability of mutant p.T221M to induce ER stress suggests that this form of PNLIP deficiency might cause acinar cell damage as well." @default.
• W2064688360 created "2016-06-24" @default.
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• W2064688360 date "2015-07-01" @default.
• W2064688360 modified "2023-10-17" @default.
• W2064688360 title "A novel mutation in PNLIP causes pancreatic triglyceride lipase deficiency through protein misfolding" @default.
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• W2064688360 doi "https://doi.org/10.1016/j.bbadis.2015.04.002" @default.
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