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Deprecated: Implicit conversion from float 219.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Oncotarget 2016 ; 7 (47): 77978-86 Nephropedia Template TP
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miR-135b-5p inhibits LPS-induced TNF? production via silencing AMPK phosphatase Ppm1e #MMPMID27793001
Li P; Fan Jb; Gao Y; Zhang M; Zhang L; Yang N; Zhao X
Oncotarget 2016[Nov]; 7 (47): 77978-86 PMID27793001show ga
AMPK activation in monocytes could suppress lipopolysaccharide (LPS)-induced tissue-damaging TNFa production. We are set to provoke AMPK activation via microRNA (?miRNA?) downregulating its phosphatase Ppm1e. In human U937 and THP-1 monocytes, forced expression of microRNA-135b-5p (?miR-135b-5p?) downregulated Ppm1e and activated AMPK signaling. Further, LPS-induced TNF? production in above cells was dramatically attenuated. Ppm1e shRNA knockdown in U937 cells also activated AMPK and inhibited TNF? production by LPS. AMPK activation is required for miR-135b-induced actions in monocytes, AMPK? shRNA knockdown or T172A dominant negative mutation almost abolished miR-135b-5p's suppression on LPS-induced TNF? production. Significantly, miR-135b-5p inhibited LPS-induced reactive oxygen species (ROS) production, NF?B activation and TNF? mRNA expression in human macrophages. AMPK? knockdown or mutation again abolished above actions by miR-135b-5p. We conclude that miR-135b-5p expression downregulates Ppm1e to activate AMPK signaling, which inhibits LPS-induced TNF? production via suppressing ROS production and NF?B activation.