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Hoboth, P. ; Müller, A. ; Ivanova, A. ; Mziaut, H. ; Dehghany, J.* ; Sönmez, A. ; Lachnit, M. ; Meyer-Hermann, M.* ; Kalaidzidis, Y.* ; Solimena, M.

Aged insulin granules display reduced microtubule-dependent mobility and are disposed within actin-positive multigranular bodies.

Proc. Natl. Acad. Sci. U.S.A. 112, E667-E676 (2015)
Verlagsversion DOI PMC
Open Access Gold
Creative Commons Lizenzvertrag
Insulin secretion is key for glucose homeostasis. Insulin secretory granules (SGs) exist in different functional pools, with young SGs being more mobile and preferentially secreted. However, the principles governing the mobility of age-distinct SGs remain undefined. Using the time-reporter insulin-SNAP to track age-distinct SGs we now show that their dynamics can be classified into three components: highly dynamic, restricted, and nearly immobile. Young SGs display all three components, whereas old SGs are either restricted or nearly immobile. Both glucose stimulation and F-actin depolymerization recruit a fraction of nearly immobile young, but not old, SGs for highly dynamic, microtubule-dependent transport. Moreover, F-actin marks multigranular bodies/lysosomes containing aged SGs. These data demonstrate that SGs lose their responsiveness to glucose stimulation and competence for microtubule-mediated transport over time while changing their relationship with F-actin.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter Bayesian Probability Theory ; Diabetes ; Islets ; Processivity ; Secretion; Pancreatic Beta-cell; Molecules In-vivo; Secretory Granules; Fusion Proteins; O-6-alkylguanine-dna Alkyltransferase; Microfilamentous System; Diabetes-mellitus; Glucose-tolerance; Rat Pancreas; B-cell
Sprache englisch
Veröffentlichungsjahr 2015
HGF-Berichtsjahr 2015
ISSN (print) / ISBN 0027-8424
e-ISSN 1091-6490
Quellenangaben Band: 112, Heft: 7, Seiten: E667-E676 Artikelnummer: , Supplement: ,
Verlag National Academy of Sciences
Verlagsort Washington
Begutachtungsstatus Peer reviewed
Institut(e) Institute of Pancreatic Islet Research (IPI)
POF Topic(s) 90000 - German Center for Diabetes Research
Forschungsfeld(er) Helmholtz Diabetes Center
PSP-Element(e) G-502600-001
PubMed ID 25646459
Erfassungsdatum 2015-02-05