Angiotensin-(1-7) Improves Islet β-cell Dedifferentiation by Activating
PI3K/Akt/FoxO1 Pathway

Hao      Guo; Dandan      Guo; Min      An; Ruonan      Zhang; Caixia      Wang; Junhua      He

Abstract

Background: Islet β-cell dedifferentiation may be the main cause of reduced insulin secretion. Angiotensin-(1-7) [Ang-(1-7)] can attenuate high glucose-induced apoptosis and dedifferentiation of pancreatic β-cell, but the specific signal transduction pathway and mechanism are not yet clear.

Objectives: This study aimed to investigate the effects of Ang-(1-7) on high glucose-induced islet β-cell dedifferentiation by activating the phosphatidylinositol-3-kinase/Protein kinase B/ Forkhead box transcription factor O1 (PI3K/Akt/FoxO1) signaling pathway.

Methods: The mouse islet β-cell line MIN6 cells were passaged and cultured and randomly divided into five groups: control (Con) group, high glucose (HG) group, HG with Ang-(1-7) group, HG with Ang-(1-7) and specific MasR antagonist A-779 group, and HG with Ang-(1-7) and PI3K inhibitor LY294002 group. After 48 hours, glucose-stimulated insulin secretion (GSIS) was detected by Enzyme-Linked Immunosorbent Assay (ELISA). The mRNA and protein expression levels of β-cell-specific factors (Pancreatic duodenal homeobox-1 (Pdx1), v-maf musculoaponeurotic fibrosarcoma oncogene homolog A(MafA)) and endocrine progenitor cell-specific factors (Octamer binding transcription factor 4(Oct4), Nanog) were measured by Real Time-PCR and Western blot. The factors of protein expression levels of PI3K/Akt/FoxO1 signaling pathway (Akt, p-Akt, Fox- O1, p-FoxO1) were determined by Western blot.

Results: We observed for the first time that high glucotoxicity can induce dedifferentiation of pancreatic islet β-cell, causing a decrease in insulin secretion levels and expression of Pdx1, MafA, p-- FoxO1, and p-Akt and an increase in expression of Oct4 and Nanog. After Ang-(1-7) intervention, insulin secretion levels and expression of Pdx1, MafA, p-FoxO1 and p-Akt were increased, and the levels of Oct4 and Nanog were reduced. However, A-779 and LY294002 could reverse this effect. During these processes, the total Akt and total FoxO1 expression did not change significantly.

Conclusion: Ang-(1-7) may prevent high glucose-induced pathological dedifferentiation of pancreatic β-cell by activating the PI3K/Akt/FoxO1 signaling pathway.

Keywords: Diabetes mellitus, angiotensin-(1-7), islet β-cell, dedifferentiation, pi3k/akt/foxo1, protein.

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DOI https://dx.doi.org/10.2174/0109298665257646231020054036	Print ISSN 0929-8665
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Protein & Peptide Letters

Angiotensin-(1-7) Improves Islet β-cell Dedifferentiation by Activating PI3K/Akt/FoxO1 Pathway

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