Blood samples were collected with a heparinized syringe before mice were sacrificed. Blood glucose level was determined using the glucose oxidase method. HbA1c level was determined using the DCA2000 HbA1c reagent kit (SIEMENS Healthcare Diagnostics, Inc., Tarrytown, NY, USA). Plasma creatinine level was determined using a Detect X Serum Creatinine Detection Kit (Arbor Assays, Ann Arbor, MI, USA). Cystatin C level was measured using a cystatin C Elisa kit (W Systems, Minneapolis, MN, USA). LPO level was measured by reacting with thiobarbituric acid (TBA) as described previously [33 (link)].
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