miR-194 Accelerates Apoptosis of Aβ1–42-Transduced Hippocampal Neurons by Inhibiting Nrn1 and Decreasing PI3K/Akt Signaling Pathway Activity

• Published in: Genes Vol. 10; no. 4; p. 313
• Main Authors: Wang, Tingting, Cheng, Yaling, Han, Haibin, Liu, Jie, Tian, Bo, Liu, Xiaocui
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 21.04.2019; MDPI
• Subjects: 1-Phosphatidylinositol 3-kinase; AKT protein; Alzheimer's disease; Apoptosis; BAX protein; Bcl-2 protein; Binding sites; Caspase-3; Cell cycle; Flow cytometry; Hippocampus; Immunofluorescence; MicroRNAs; Neurons; Pathogenesis; Peptides; Signal transduction; United Kingdom > UK; United States > US; Japan
• DOI: 10.3390/genes10040313
• ISSN: 2073-4425

This article explores the mechanism of miR-194 on the proliferation and apoptosis of Aβ1–42-transduced hippocampal neurons. Aβ1–42-transduced hippocampal neuron model was established by inducing hippocampal neurons with Aβ1–42. MTT assay and flow cytometry were used to detect the viability and apoptosis of hippocampal neurons, respectively. qRT-PCR was used to detect changes in miR-194 and Nrn1 expression after Aβ1–42 induction. Aβ1–42-transduced hippocampal neurons were transfected with miR-194 mimics and/or Nrn1 overexpression vectors. Their viability and neurite length were detected by MTT assay and immunofluorescence, respectively. Western blot was used to detect protein expression. Aβ1–42 inhibited Aβ1–42-transduced hippocampal neuron activity and promoted their apoptosis in a dose-dependent manner. miR-194 was upregulated and Nrn1 was downregulated in Aβ1–42-transduced hippocampal neurons (p < 0.05). Compared with the model group, Aβ1–42-transduced hippocampal neurons of the miR-194 mimic group had much lower activity, average longest neurite length, Nrn1, p-AkT, and Bcl-2 protein expression and had much higher Bax, Caspase-3, and Cleaved Caspase-3 protein expression. Compared with the model group, Aβ1–42-transduced hippocampal neurons of the LV-Nrn1 group had much higher activity, average longest neurite length, Nrn1, p-AkT, and Bcl-2 protein expression and had much lower Bax, Caspase-3, and Cleaved Caspase-3 protein expression. Nrn1 is a target gene of miR-194. miR-194 inhibited apoptosis of Aβ1–42-transduced hippocampal neurons by inhibiting Nrn1 and decreasing PI3K/AkT signaling pathway activity.