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• W2019298905 startingPage "767" @default.
• W2019298905 abstract "We report that simultaneous expression of Akt and angiopoietin-1 (Ang-1) transgenes supported mitogenesis in stem cells with a critical role for microRNA-143 (miR-143) downstream of FoxO1 transcription factor. Mesenchymal stem cells (MSC) from young male rats were transduced with Ad-vectors encoding for Akt (AktMSC) and Ang-1 (Ang-1MSC) transgenes for their individual or simultaneous overexpression (AAMSC; > 5-fold gene level and > 4-fold Akt and Ang-1 protein expression in AAMSC vs. Ad-Empty transduced MSC; EmpMSC). AAMSC had higher phosphorylation of FoxO1, which activated Erk5, a distinct mitogen-induced MAPK that drove transcriptional activation of cyclin D1 and Cdk4. Flow cytometry showed > 10% higher S-phase cell population that was confirmed by BrdU assay (15%) and immunohistology for Ki67 (11%) in AAMSC using EmpMSC as controls. miR array supported by real-time PCR showed induction of miR-143 in AAMSC (4.73-fold vs.. EmpMSC). Luciferase assay indicated a dependent relationship between miR-143 and Erk5 in AAMSC. FoxO1-specific siRNA upregulated miR-143, whereas inhibition of miR-143 did not change FoxO1 activation. However, miR-143 inhibition repressed phosphorylation of Erk5 and abrogated cyclin D1 with concomitant reduction in cells entering cell cycle. During in vivo studies, male GFP+ AAMSC transplanted into wild-type female infarcted rat hearts showed significantly higher number of Ki67 expressing cells (p < 0.05 vs. EmpMSC) 7 days after engraftment (n = 4 animals/group). In conclusion, co-overexpression of Akt and Ang-1 in MSC activated cell cycle progression by upregulation of miR-143 and stimulation of FoxO1 and Erk5 signaling." @default.
• W2019298905 created "2016-06-24" @default.
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• W2019298905 date "2012-02-15" @default.
• W2019298905 modified "2023-10-18" @default.
• W2019298905 title "MicroRNA-143 is a critical regulator of cell cycle activity in stem cells with co-overexpression of Akt and angiopoietin-1 via transcriptional regulation of Erk5/cyclin D1 signaling" @default.
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• W2019298905 doi "https://doi.org/10.4161/cc.11.4.19211" @default.
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