Hartman Institute for Therapeutic Organ Regeneration

PDX1 MAFA β-cells contribute to islet function and insulin release.

TitlePDX1 MAFA β-cells contribute to islet function and insulin release.
Publication TypeJournal Article
Year of Publication2021
AuthorsNasteska D, Fine NHF, Ashford FB, Cuozzo F, Viloria K, Smith G, Dahir A, Dawson PWJ, Lai Y-C, Bastidas-Ponce A, Bakhti M, Rutter GA, Fiancette R, Nano R, Piemonti L, Lickert H, Zhou Q, Akerman I, Hodson DJ
JournalNat Commun
Volume12
Issue1
Pagination674
Date Published2021 Jan 29
ISSN2041-1723
KeywordsAnimals, Calcium, Cells, Cultured, Diabetes Mellitus, Type 2, Female, Gene Knock-In Techniques, Homeodomain Proteins, Humans, Insulin Secretion, Insulin-Secreting Cells, Maf Transcription Factors, Large, Male, Mice, Mice, Transgenic, Models, Animal, Primary Cell Culture, Trans-Activators
Abstract

<p>Transcriptionally mature and immature β-cells co-exist within the adult islet. How such diversity contributes to insulin release remains poorly understood. Here we show that subtle differences in β-cell maturity, defined using PDX1 and MAFA expression, contribute to islet operation. Functional mapping of rodent and human islets containing proportionally more PDX1 and MAFA β-cells reveals defects in metabolism, ionic fluxes and insulin secretion. At the transcriptomic level, the presence of increased numbers of PDX1 and MAFA β-cells leads to dysregulation of gene pathways involved in metabolic processes. Using a chemogenetic disruption strategy, differences in PDX1 and MAFA expression are shown to depend on islet Ca signaling patterns. During metabolic stress, islet function can be restored by redressing the balance between PDX1 and MAFA levels across the β-cell population. Thus, preserving heterogeneity in PDX1 and MAFA expression, and more widely in β-cell maturity, might be important for the maintenance of islet function.</p>

DOI10.1038/s41467-020-20632-z
Alternate JournalNat Commun
PubMed ID33514698
PubMed Central IDPMC7846747
Grant ListMR/S025618/1 / MRC_ / Medical Research Council / United Kingdom
MR/L020149/1 / MRC_ / Medical Research Council / United Kingdom
MR/N00275X/1 / MRC_ / Medical Research Council / United Kingdom
R01 DK106253 / DK / NIDDK NIH HHS / United States
MR/J0003042/1 / MRC_ / Medical Research Council / United Kingdom
WT098424AIA / WT_ / Wellcome Trust / United Kingdom
212625/Z/18/Z / WT_ / Wellcome Trust / United Kingdom
UC4 DK116280 / DK / NIDDK NIH HHS / United States
MR/R022259/1 / MRC_ / Medical Research Council / United Kingdom
/ WT_ / Wellcome Trust / United Kingdom
MR/L02036X/1 / MRC_ / Medical Research Council / United Kingdom

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Hartman Institute for Therapeutic Organ Regeneration
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