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Updated: Apr 22, 2026

siRNA Electroporation to Modulate Autophagy in Herpes Simplex Virus Type 1-Infected Monocyte-Derived Dendritic Cells
Published on: October 28, 2019
MicroRNA let-7i induced autophagy to protect T cell from apoptosis by targeting IGF1R
Chunfeng Hou1, Mengzhu Zhu2, Min Sun3
1Department of Rheumatology, Jining First People's Hospital, Jining, Shandong 272111, PR China.
Abstract:
MicroRNA let-7i is up-regulated in T cells from patients with Ankylosing Spondylitis (AS). In this study, we investigated the role of let-7i in T cells survival. Our results demonstrated down-regulation of insulin-like growth factor-1 receptor (IGF1R) in T cells from patients with AS. Luciferase reporter assay suggested IGF1R as direct target of let-7i. Overexpression of let-7i in Jurkat cells significantly suppressed IGF1R expression, which mimicked the action of IGF1R siRNA. IGF1R inhibition led to a strinking decrease in phosphorylation of mTOR and Akt, down-regulation of Bcl-2, up-regulation of Bax and cleavage of caspase 3 and PARP. Meanwhile, IGF1R inhibition induced autophagy. Autophagy induced by let-7i overexpression contributed to protect cells from apoptosis. Our data indicated that let-7i might control T cells fates in AS by targeting IGF1R.
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