Silencing of the FTO gene inhibits insulin secretion: An in vitro study using GRINCH cells

Jalal Taneera, Rashmi B Prasad, Sarah Dhaiban, Abdul Khader Mohammed, Leena Haataja, Peter Arvan, Mawieh Hamad, Leif Groop, Claes B Wollheim

Research output: Contribution to journalArticlepeer-review

12 Citations (SciVal)


Expression of fat mass and obesity-associated gene (FTO) and ADP-ribosylation factor-like 15 (ARL15) in human islets is inversely correlated with HbA1c. However, their impact on insulin secretion is still ambiguous. Here in, we investigated the role of FTO and ARL15 using GRINCH (Glucose-Responsive Insulin-secreting C-peptide-modified Human proinsulin) clonal rat β-cells. GRINCH cells have inserted GFP into the human C-peptide insulin gene. Hence, secreted CpepGFP served to monitor insulin secretion. mRNA silencing of FTO in GRINCH cells showed a significant reduction in glucose but not depolarization-stimulated insulin secretion, whereas ARL15 silencing had no effect. A significant down-regulation of insulin mRNA was observed in FTO knockdown cells. Type-2 Diabetic islets revealed a reduced expression of FTO mRNA. In conclusion, our data suggest that fluorescent CpepGFP released from GRINCH cells may serve as a convenient marker for insulin secretion. Silencing of FTO expression, but not ARL15, inhibits insulin secretion by affecting metabolic signaling.

Original languageEnglish
Pages (from-to)10-17
JournalMolecular and Cellular Endocrinology
Publication statusPublished - 2018

Subject classification (UKÄ)

  • Medical Genetics
  • Endocrinology and Diabetes


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