PKCδ promotes high glucose induced renal tubular oxidative damage via regulating activation and translocation of p66Shc.
Diabetic kidney disease (DKD) is a leading cause of end-stage renal disease (ESRD). Renal tubular injury by overproduction of ROS in mitochondria plays a critical role in the pathogenesis of DKD. Evidences have shown that p66Shc was involved in renal tubular injury via mitochondrial-dependent ROS production pathway, but little is known about the upstream signaling of p66Shc that leads to tubular oxidative damage under high glucose conditions. In this study, an increased PKCδ and p66Shc activation and ROS production in renal tissues of patients with diabetic nephropathy were seen and further analysis revealed a positive correlation between the tubulointerstitial damage and p-PKCδ, p-p66Shc, and ROS production. In vitro, we investigated the phosphorylation and activation of p66Shc and PKCδ during treatment of HK-2 cells with high glucose (HG). Results showed that the activation of p66Shc and PKCδ was increased in a dose- and time-dependent manner, and this effect was suppressed by Rottlerin, a pharmacologic inhibitor of PKCδ. Moreover, PKCδ siRNA partially blocked HG-induced p66Shc phosphorylation, translocation, and ROS production in HK-2 cells. Taken together, these data suggest that activation of PKCδ promotes tubular cell injury through regulating p66Shc phosphorylation and mitochondrial translocation in HG ambient.
Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410000, China.
Panai
P
Song
Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410000, China.
Shikun
S
Yang
Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410000, China.
Li
L
Xiao
Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410000, China.
Xiaoxuan
X
Xu
Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410000, China.
Chengyuan
C
Tang
Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410000, China.
Yuyan
Y
Yang
Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410000, China.
Mingming
M
Ma
Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410000, China.
Jiefu
J
Zhu
Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410000, China.
Fuyou
F
Liu
Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410000, China.
Lin
0000-0002-3666-4381
L
Sun
D000098:Acetophenones / Q000494:pharmacology; D001578:Benzopyrans / Q000494:pharmacology; D002460:Cell Line; D003928:Diabetic Nephropathies / Q000201:enzymology / Q000378:metabolism*; D005947:Glucose / Q000008:administration & dosage*; D006801:Humans; D007684:Kidney Tubules / Q000378:metabolism* / Q000473:pathology*; D008928:Mitochondria / Q000378:metabolism; D018384:Oxidative Stress / Q000187:drug effects*; D051745:Protein Kinase C-delta / Q000037:antagonists & inhibitors / Q000378:metabolism*; D034741:RNA, Small Interfering / Q000008:administration & dosage / Q000235:genetics; D017382:Reactive Oxygen Species / Q000378:metabolism; D055765:Shc Signaling Adaptor Proteins / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction; D000071425:Src Homology 2 Domain-Containing, Transforming Protein 1; D014178:Translocation, Genetic
D000098:Acetophenones; D001578:Benzopyrans; D034741:RNA, Small Interfering; D017382:Reactive Oxygen Species; C528024:SHC1 protein, human; D055765:Shc Signaling Adaptor Proteins; D000071425:Src Homology 2 Domain-Containing, Transforming Protein 1; C085746:rottlerin; D051745:Protein Kinase C-delta; D005947:Glucose