To evaluate kidney function, we measured serum blood urea nitrogen (BUN) and creatinine (Cre) with commercial kits (Nanjing Jiancheng Bioengineering Institute, Nanjing, China) according to the manufacturer's protocols. The commercial kit for measurement of Cre was based on creatinine acid oxidase method as previous reports [40 (link),41 (link)]. The levels of urine Fg were measured using commercially available species-specific Luminex-based assay kit from Millipore (Billerica, MA, USA). The levels of serum Cystatin C were analyzed by a mouse Cystatin C commercial kit (Elabscience Biotechnology Co.,Ltd, Wuhan, China). Subsequently, the optical density for measurement of serum Cystatin C was measured using a microplate reader (SYNERGY H4, BioTek, VT, USA) at the absorbance of 450 nm.
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