E-viri
Recenzirano
Odprti dostop
-
Sharoyko, Vladimir V; Abels, Mia; Sun, Jiangming; Nicholas, Lisa M; Mollet, Ines Guerra; Stamenkovic, Jelena A; Göhring, Isabel; Malmgren, Siri; Storm, Petter; Fadista, João; Spégel, Peter; Metodiev, Metodi D; Larsson, Nils-Göran; Eliasson, Lena; Wierup, Nils; Mulder, Hindrik
Human molecular genetics, 11/2014, Letnik: 23, Številka: 21Journal Article
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.
Vnos na polico
Trajna povezava
- URL:
Faktor vpliva
Dostop do baze podatkov JCR je dovoljen samo uporabnikom iz Slovenije. Vaš trenutni IP-naslov ni na seznamu dovoljenih za dostop, zato je potrebna avtentikacija z ustreznim računom AAI.
Leto | Faktor vpliva | Izdaja | Kategorija | Razvrstitev | ||||
---|---|---|---|---|---|---|---|---|
JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
Baze podatkov, v katerih je revija indeksirana
Ime baze podatkov | Področje | Leto |
---|
Povezave do osebnih bibliografij avtorjev | Povezave do podatkov o raziskovalcih v sistemu SICRIS |
---|
Vir: Osebne bibliografije
in: SICRIS
To gradivo vam je dostopno v celotnem besedilu. Če kljub temu želite naročiti gradivo, kliknite gumb Nadaljuj.