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miR-29a and miR-29b Contribute to Pancreatic β-Cell-Specific Silencing of Monocarboxylate Transporter 1 (Mct1)

Pullen, Timothy J., da Silva Xavier, Gabriela, Kelsey, Gavin, Rutter, Guy A.·2011·Molecular and Cellular Biology
DOI 10.1128/mcb.01433-10
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Abstract

In pancreatic β cells, elevated glucose concentrations stimulate mitochondrial oxidative metabolism to raise intracellular ATP/ADP levels, prompting insulin secretion. Unusually low levels of expression of genes encoding the plasma membrane monocarboxylate transporter, MCT1 (SLC16A1), as well as lactate dehydrogenase A (LDHA) ensure that glucose-derived pyruvate is efficiently metabolized by mitochondria, while exogenous lactate or pyruvate is unable to stimulate metabolism and hence insulin secretion inappropriately. We show here that whereas DNA methylation at the Mct1 promoter is unlikely to be involved in cell-type-specific transcriptional repression, three microRNAs (miRNAs), miR-29a, miR-29b, and miR-124, selectively target both human and mouse MCT1 3' untranslated regions. Mutation of the cognate miR-29 or miR-124 binding sites abolishes the effects of the corresponding miRNAs, demonstrating a direct action of these miRNAs on the MCT1 message. However, despite reports of its expression in the mouse β-cell line MIN6, miR-124 was not detectably expressed in mature mouse islets. In contrast, the three isoforms of miR-29 are highly expressed and enriched in mouse islets. We show that inhibition of miR-29a in primary mouse islets increases Mct1 mRNA levels, demonstrating that miR-29 isoforms contribute to the β-cell-specific silencing of the MCT1 transporter and may thus affect insulin release.

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Metadata

Authors
Pullen, T. J., da Silva Xavier, G., Kelsey, G., & Rutter, G. A.
Affiliations
  • Department of Cell Biology, Division of Medicine, Sir Alexander Fleming Building, Imperial College London, Exhibition Road, London, United Kingdom
  • Developmental Genetics and Imprinting, Babraham Institute, Cambridge, United Kingdom
Venue
Molecular and Cellular Biology
Publisher
Informa UK Limited
Published
2011-08-01
Volume
31
Issue
15
Pages
3182-3194
ISSN
1098-5549
DOI
10.1128/mcb.01433-10
Cited by
258
References
6
Language
en
Licence
journals.asm.org/non-commercial-tdm-license (tdm)

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