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Insulin secretion is highly sensitive to desorption of plasma membrane cholesterol.

På svenska

Author

  • Jenny Vikman
  • Javier Jimenez
  • Per Nyman
  • Johan Thelin
  • Lena Eliasson

Summary, in English

Cholesterol-rich clusters of SNARE (soluble NSF attachment protein receptor) proteins have been implicated as being important for exocytosis. Here we demonstrate the significance of cholesterol for normal biphasic insulin secretion in mouse beta cells by removal of cholesterol from the plasma membrane using methyl-beta-cyclodextrin (MBCD). Maximal inhibition of insulin secretion in static incubations was achieved using 0.1 mM MBCD. In in situ pancreatic perfusion measurements, both first and second phase insulin secretions were reduced by approximately 50% (P<0.05). This was accompanied by a reduced number of docked large dense core vesicles (LDCVs) ( approximately 40%; P<0.01) and a reduced exocytotic response (>50%; P<0.01). Further, subcellular fractionations demonstrated movement of the synaptosomal protein of 25 kDa (SNAP-25) from the plasma membrane to the cytosol after MBCD treatment. The inhibitory actions of MBCD were counteracted by subsequent addition of cholesterol. We hypothesize that desorption of cholesterol leads to the disturbance of a basic exocytotic mechanism partly due to migration of SNAP-25, and we conclude that insulin secretion is highly sensitive to changes in plasma membrane cholesterol.-Vikman, J., Jimenez-Feltström, J., Nyman, P., Thelin, J., Eliasson, L. Insulin secretion is highly sensitive to desorption of plasma membrane cholesterol.

Department/s

Publishing year

2009

Language

English

Pages

58-67

Publication/Series

The FASEB journal : official publication of the Federation of American Societies for Experimental Biology

Volume

23

Issue

1

Document type

Journal article

Publisher

The Federation of American Societies for Experimental Biology

Topic

  • Cell and Molecular Biology

Status

Published

Research group

  • Islet cell physiology

ISBN/ISSN/Other

  • ISSN: 1530-6860