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Müller, A. ; Schmidt, D.* ; Xu, C.S.* ; Pang, S.* ; D'Costa, J.V. ; Kretschmar, S.* ; Münster, C. ; Kurth, T.* ; Jug, F.* ; Weigert, M.* ; Hess, H.F.* ; Solimena, M.

3D FIB-SEM reconstruction of microtubule-organelle interaction in whole primary mouse β cells.

J. Cell Biol. 220:e202010039 (2021)
Verlagsversion DOI
Open Access Gold (Paid Option)
Creative Commons Lizenzvertrag
Microtubules play a major role in intracellular trafficking of vesicles in endocrine cells. Detailed knowledge of microtubule organization and their relation to other cell constituents is crucial for understanding cell function. However, their role in insulin transport and secretion is under debate. Here, we use FIB-SEM to image islet β cells in their entirety with unprecedented resolution. We reconstruct mitochondria, Golgi apparati, centrioles, insulin secretory granules, and microtubules of seven β cells, and generate a comprehensive spatial map of microtubule-organelle interactions. We find that microtubules form nonradial networks that are predominantly not connected to either centrioles or endomembranes. Microtubule number and length, but not microtubule polymer density, vary with glucose stimulation. Furthermore, insulin secretory granules are enriched near the plasma membrane, where they associate with microtubules. In summary, we provide the first 3D reconstructions of complete microtubule networks in primary mammalian cells together with evidence regarding their importance for insulin secretory granule positioning and thus their supportive role in insulin secretion.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter Insulin-secretion; Electron-microscopy; Granule Dynamics; High-throughput; In-vivo; Organization; Kinesin; Protein; Visualization; Exocytosis
ISSN (print) / ISBN 0021-9525
e-ISSN 1540-8140
Quellenangaben Band: 220, Heft: 2, Seiten: , Artikelnummer: e202010039 Supplement: ,
Verlag Rockefeller University Press
Verlagsort 950 Third Ave, 2nd Flr, New York, Ny 10022 Usa
Begutachtungsstatus Peer reviewed
Institut(e) Institute for Pancreatic Beta Cell Research (IPI)
Förderungen Howard Hughes Medical Institute
GermanIsraeli Foundation for Scientific Research and Development (GIF)
German Research Foundation (DFG)
Agence Nationale de la Recherche
Innovative Medicines Initiative 2 Joint Undertaking
European Union's Framework Program Horizon 2020
Swiss State Secretariat for Education, Research and Innovation
JDRF International
Leona M. and Harry B. Helmsley Charitable Trust
MeDDrive grant from the Carl Gustav Carus Faculty of Medicine at TU Dresden
European Fund for Regional Development
German Center for Diabetes Research (DZD e.V.) by the German Ministry for Education and Research (BMBF)