Neuronatin regulates pancreatic β cell insulin content and secretion

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Millership, S.J., Da Silva Xavier, G., Choudhury, A.I., Bertazzo, S., Chabosseau, P., Pedroni, S.M.A., Irvine, E.E., Montoya, A., Faull, P., Taylor, W.R., Kerr-Conte, J., Pattou, F., Ferrer, J., Christian, M. ORCID: 0000-0002-1616-4179, John, R.M., Latreille, M., Liu, M., Rutter, G.A., Scott, J. and Withers, D.J., 2018. Neuronatin regulates pancreatic β cell insulin content and secretion. Journal of Clinical Investigation, 128 (8), pp. 3369-3381. ISSN 0021-9738

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Official URL: http://doi.org/10.1172/jci120115

Abstract

Neuronatin (Nnat) is an imprinted gene implicated in human obesity and widely expressed in neuroendocrine and metabolic tissues in a hormone- and nutrient-sensitive manner. However, its molecular and cellular functions and precise role in organismal physiology remain only partly defined. Here we demonstrate that mice lacking Nnat globally or specifically in β cells display impaired glucose-stimulated insulin secretion leading to defective glucose handling under conditions of nutrient excess. In contrast, we report no evidence for any feeding or body weight phenotypes in global Nnat-null mice. At the molecular level neuronatin augments insulin signal peptide cleavage by binding to the signal peptidase complex and facilitates translocation of the nascent preprohormone. Loss of neuronatin expression in β cells therefore reduces insulin content and blunts glucose-stimulated insulin secretion. Nnat expression, in turn, is glucose-regulated. This mechanism therefore represents a novel site of nutrient-sensitive control of β cell function and whole-animal glucose homeostasis. These data also suggest a potential wider role for Nnat in the regulation of metabolism through the modulation of peptide processing events.

Item Type:

Journal article

Publication Title:

Journal of Clinical Investigation

Creators:

Publisher:

American Society for Clinical Investigation

Date:

1 August 2018

Volume:

128

Number:

ISSN:

0021-9738

Identifiers:

Number	Type
10.1172/jci120115	DOI

Rights:

This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

Divisions:

Schools > School of Science and Technology

Record created by:

Jonathan Gallacher

Date Added:

12 Aug 2019 10:24

Last Modified:

12 Aug 2019 10:32

URI:

https://irep.ntu.ac.uk/id/eprint/37221