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Zeitschriftenartikel

Loss of TFB1M results in mitochondrial dysfunction that leads to impaired insulin secretion and diabetes.

MPG-Autoren

Sharoyko, Vladimir V
Max Planck Institute for Biology of Ageing, Max Planck Society;

Abels, Mia
Max Planck Institute for Biology of Ageing, Max Planck Society;

Sun, Jiangming
Max Planck Institute for Biology of Ageing, Max Planck Society;

Nicholas, Lisa M
Max Planck Institute for Biology of Ageing, Max Planck Society;

Mollet, Ines Guerra
Max Planck Institute for Biology of Ageing, Max Planck Society;

Stamenkovic, Jelena A
Max Planck Institute for Biology of Ageing, Max Planck Society;

Göhring, Isabel
Max Planck Institute for Biology of Ageing, Max Planck Society;

Malmgren, Siri
Max Planck Institute for Biology of Ageing, Max Planck Society;

Storm, Petter
Max Planck Institute for Biology of Ageing, Max Planck Society;

Fadista, João
Max Planck Institute for Biology of Ageing, Max Planck Society;

Spégel, Peter
Max Planck Institute for Biology of Ageing, Max Planck Society;

Metodiev, Metodi D
Max Planck Institute for Biology of Ageing, Max Planck Society;

Larsson, Nils-Göran
Max Planck Institute for Biology of Ageing, Max Planck Society;

Eliasson, Lena
Max Planck Institute for Biology of Ageing, Max Planck Society;

Wierup, Nils
Max Planck Institute for Biology of Ageing, Max Planck Society;

Mulder, Hindrik
Max Planck Institute for Biology of Ageing, Max Planck Society;

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Zitation

Sharoyko, V. V., Abels, M., Sun, J., Nicholas, L. M., Mollet, I. G., Stamenkovic, J. A., et al. (2014). Loss of TFB1M results in mitochondrial dysfunction that leads to impaired insulin secretion and diabetes. Hum Mol Genet, 23(21), 5733-5749.

Zusammenfassung

We have previously identified transcription factor B1 mitochondrial (TFB1M) as a type 2 diabetes (T2D) risk gene, using human and mouse genetics. To further understand the function of TFB1M and how it is associated with T2D, we created a β-cell-specific knockout of Tfb1m, which gradually developed diabetes. Prior to the onset of diabetes, β-Tfb1m(-/-) mice exhibited retarded glucose clearance owing to impaired insulin secretion. β-Tfb1m(-/-) islets released less insulin in response to fuels, contained less insulin and secretory granules and displayed reduced β-cell mass. Moreover, mitochondria in Tfb1m-deficient β-cells were more abundant with disrupted architecture. TFB1M is known to control mitochondrial protein translation by adenine dimethylation of 12S ribosomal RNA (rRNA). Here, we found that the levels of TFB1M and mitochondrial-encoded proteins, mitochondrial 12S rRNA methylation, ATP production and oxygen consumption were reduced in β-Tfb1m(-/-) islets. Furthermore, the levels of reactive oxygen species (ROS) in response to cellular stress were increased whereas induction of defense mechanisms was attenuated. We also show increased apoptosis and necrosis as well as infiltration of macrophages and CD4(+) cells in the islets. Taken together, our findings demonstrate that Tfb1m-deficiency in β-cells caused mitochondrial dysfunction and subsequently diabetes owing to combined loss of β-cell function and mass. These observations reflect pathogenetic processes in human islets: using RNA sequencing, we found that the TFB1M risk variant exhibited a negative gene-dosage effect on islet TFB1M mRNA levels, as well as insulin secretion. Our findings highlight the role of mitochondrial dysfunction in impairments of β-cell function and mass, the hallmarks of T2D.