Activities per year
Abstract
BACKGROUND: Free fatty acid receptor 1 (FFAR1) is G-protein coupled receptor predominantly expressed in pancreatic β-cells that is activated by a variety of free fatty acids (FFAs). Once activated, it promotes glucose-stimulated insulin secretion (GSIS). However, increased levels of FFAs lead to lipotoxicity, inducing loss of β-cell function. FFAR1 plays a key role in the development of type 2 diabetes (T2D), and previous studies have indicated the importance of developing anti-diabetic therapies against FFAR1, although its role in the regulation of β-cell function remains unclear. The present study investigated the role of FFAR1 under lipotoxic conditions using palmitic acid (PA). The rat insulinoma 1 clone 832/13 (INS-1 832/13) cell line was used as a model as it physiologically resembles native pancreatic β-cells. Key players of the insulin signaling pathway, such as mTOR, Akt, IRS-1, and the insulin receptor (INSR1β), were selected as candidates to be analyzed under lipotoxic conditions.
RESULTS: We revealed that PA-induced lipotoxicity affected GSIS in INS-1 cells and negatively modulated the activity of both IRS-1 and Akt. Reduced phosphorylation of both IRS-1 S636/639 and Akt S473 was observed, in addition to decreased expression of both INSR1β and FFAR1. Moreover, transient knockdown of FFAR1 led to a reduction in IRS-1 mRNA expression and an increase in INSR1β mRNA. Finally, PA affected localization of FFAR1 from the cytoplasm to the perinucleus.
CONCLUSIONS: In conclusion, our study suggests a novel regulatory involvement of FFAR1 in crosstalk with mTOR-Akt and IRS-1 signaling in β-cells under lipotoxic conditions.
Original language | English |
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Pages (from-to) | 44 |
Number of pages | 1 |
Journal | Biological Research |
Volume | 52 |
Issue number | 1 |
DOIs | |
Publication status | Published - 19 Aug 2019 |
Keywords
- Akt
- FFAR1
- INSR
- IRS-1
- Insulin resistance
- Lipotoxicity
- Palmitic acid
- Type 2 diabetes
- mTOR
- β-cells
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Activities
- 1 Participating in a conference, workshop, ...
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Diabetes Asia Conference 2019
Sulaiman Marafie (Participant)
10 Oct 2019 → 13 Oct 2019Activity: Participating in or organising an event types › Participating in a conference, workshop, ...