title: Mutant proinsulin proteins associated with neonatal diabetes are retained in the endoplasmic reticulum and not efficiently secreted.
abstract: Mutations in the preproinsulin protein that affect processing of preproinsulin to proinsulin or lead to misfolding of proinsulin are associated with diabetes. We examined the subcellular localization and secretion of 13 neonatal diabetes-associated human proinsulin proteins (A24D, G32R, G32S, L35P, C43G, G47V, F48C, G84R, R89C, G90C, C96Y, S101C and Y108C) in rat INS-1 insulinoma cells. These mutant proinsulin proteins accumulate in the endoplasmic reticulum (ER) and are poorly secreted except for G84R and in contrast to wild-type and hyperproinsulinemia-associated mutant proteins (H34D and R89H) which were sorted to secretory granules and efficiently secreted. We also examined the effect of C96Y mutant proinsulin on the synthesis and secretion of wild-type insulin and observed a dominant-negative effect of the mutant proinsulin on the synthesis and secretion of wild-type insulin due to induction of the unfolded protein response and resulting attenuation of overall translation.
authors.affiliation: Department of Medicine, The University of Chicago, 5841 S. Maryland Avenue, MC 1027, Chicago, IL 60637, USA. sooyoung@uchicago.edu
authors.forename: Soo-Young
authors.initials: SY
authors.lastname: Park
authors.forename: Honggang
authors.initials: H
authors.lastname: Ye
authors.forename: Donald F
authors.initials: DF
authors.lastname: Steiner
authors.forename: Graeme I
authors.initials: GI
authors.lastname: Bell
mesh_terms: D019943:Amino Acid Substitution / Q000235:genetics; D000818:Animals; D045744:Cell Line, Tumor; D003920:Diabetes Mellitus / Q000235:genetics / Q000378:metabolism*; D004721:Endoplasmic Reticulum / Q000378:metabolism*; D006801:Humans; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000235:genetics / Q000378:metabolism*; D009154:Mutation; D011384:Proinsulin / Q000235:genetics / Q000378:metabolism*; D017510:Protein Folding; D051381:Rats
chemical_list: D011384:Proinsulin