PuSH - Publication Server of Helmholtz Zentrum München: PTBP1 is required for glucose-stimulated cap-independent translation of insulin granule proteins and Coxsackieviruses in beta cells.

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Knoch, K.P.* ; Nath-Sain, S.* ; Petzold, A.* ; Schneider, H.* ; Beck, M.* ; Wegbrod, C.* ; Sönmez, A.* ; Münster, C.* ; Friedrich, A.* ; Roivainen, M.* ; Solimena, M.*

PTBP1 is required for glucose-stimulated cap-independent translation of insulin granule proteins and Coxsackieviruses in beta cells.

Mol. Metab. 3, 518-530 (2014)

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Glucose and GLP-1 stimulate not only insulin secretion, but also the post-transcriptional induction of insulin granule biogenesis. This process involves the nucleocytoplasmic translocation of the RNA binding protein PTBP1. Binding of PTBP1 to the 3'-UTRs of mRNAs for insulin and other cargoes of beta cell granules increases their stability. Here we show that glucose enhances also the binding of PTBP1 to the 5'-UTRs of these transcripts, which display IRES activity, and their translation exclusively in a cap-independent fashion. Accordingly, glucose-induced biosynthesis of granule cargoes was unaffected by pharmacological, genetic or Coxsackievirus-mediated inhibition of cap-dependent translation. Infection with Coxsackieviruses, which also depend on PTBP1 for their own cap-independent translation, reduced instead granule stores and insulin release. These findings provide insight into the mechanism for glucose-induction of insulin granule production and on how Coxsackieviruses, which have been implicated in the pathogenesis of type 1 diabetes, can foster beta cell failure.

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Publication type Article: Journal article

Document type Scientific Article

Keywords Beta Cells ; Cv, Coxsackievirus ; Diabetes ; Er, Endoplasmic Reticulum ; Ev, Enterovirus ; F, Faulkner ; Fl, Firefly Luciferase ; Ires, Internal Ribosomal Entry Site ; Itaf, Ires-trans-acting Factor ; Insulin ; Mca, Min6 Cell Adapted ; Pabp, Poly(a)-binding Protein ; Pc, Prohormone Convertase ; Ptbp1, Polypyrimidine Tract-binding Protein 1 ; Polypyrimidine Tract-binding Protein ; S6k1, P70s6 Kinase 1 ; Secretory Granules ; T1d, Type 1 Diabetes ; Translation ; Utr, Untranslated Region ; Virus ; Eif4e-v5, Eif

Language english

Publication Year 2014

HGF-reported in Year 0

ISSN (print) / ISBN 2212-8778

e-ISSN 2212-8778

Journal Molecular Metabolism

Quellenangaben Volume: 3, Issue: 5, Pages: 518-530

Publisher Elsevier

Publishing Place Amsterdam

Reviewing status Peer reviewed

Institute(s) Institute of Pancreatic Islet Research (IPI)
German Center for Diabetes Reseach (DZD)

PubMed ID 25061557

DOI 10.1016/j.molmet.2014.05.002

Erfassungsdatum 2014-12-31

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