Objective To investigate the influence of lead exposure in rats during the developmental stage on the expression of leptin in plasma,cerebrospinal fluid,and hippocampus,as well as investigating whether leptin is associated with the mechanism of cognitive impairment induced by lead exposure.Methods The rat model of cognitive impairment after chronic lead exposure was established by adding lead acetate into drinking water.According to the concentration of lead acetate in drinking water,the rats were divided i...