Anti-insulin resistance effects of salidroside through mitochondrial quality control.

Mitochondrial quality control (MQC) and function are determinants for cellular energy metabolism, and their disorders are reported to play an important role in the development of insulin resistance (IR). Salidroside was reporte d to have beneficial effects on MQC through AMPK pathway; however, it is unknown whet her salidroside exerts anti-IR effect with this action. This study sought to inv estigate the effects of salidroside on IR with an exploration of the mechanisms of its action. Experimental IR models were adopted in high-fat-diet (HFD)-fed mice and palmitate-treated C2C12 myotubes, respectively. Blood levels of glucose and insulin as well as cellular glucose uptake were determined, and mitochondrial function and MQC-asso ciated parameters and reactive oxygen species (ROS) production were analyzed based on treatments with the activator (AICAR), inhibitors (compound C and EX-527) or specific siRNA of Ampk/Sirt1 and mitochondrial ROS scavenger (mito-TEMPO). Protein expressi on level was determined by Western blot, cellular observation by transmission electron microscope and ROS production by functional analysis kits. Salidroside red uced IR and activated insulin signaling along with the stimulation of AMPK/SIRT1 sign aling and downstream regulation of MQC and ROS production. These salidroside effects were comparable to those of AICAR and could be prevented by AMPK/SIRT1 inhibitors or siRNAs, respectively. Salidroside reduces IR and regulates MQC and ROS production by activating AMPK/SIRT1 signaling pathway. Since IR is a critical issue for public health, to explore a potent agent against IR is of high interest. The anti-IR effec ts of salidroside warrant further experimental and clinical studies. [ABSTRACT FROM AUTHOR]