LPS from E. coli serotype O26:B6 was obtained from Sigma Aldrich (St. Louis, MO, USA). The LPS was dissolved in sterile saline vehicle to a concentration of 0.1mg/ml. Mice were randomly assigned to treatment groups and received a single intraperitoneal injection of LPS (1.5mg/kg body weight) or an equivalent volume of sterile saline vehicle and returned to their home cage immediately following injection. The dose of LPS when administered during the peripubertal period has previously been demonstrated to decrease behavioral responses to estradiol in adulthood [8 (link), 10 (link), 18 (link), 19 , 32 (link)]. Consistent with previous reports [8 (link), 10 (link), 18 (link), 19 , 32 (link)], this dose of LPS produced moderate sickness behavior.
Free full text: Click here