Figure 2From: The influence of hydrogen peroxide and histamine on lung permeability and translocation of iridium nanoparticles in the isolated perfused rat lungExperimental protocol for isolated perfused rat lungs. All perfusions were done under negative pressure ventilation. Following a 15 minute period of equilibration, during which the lungs were already ventilated and perfused, the experiment started by the inhalation of freshly produced 192Ir-UFP from the aerosol line. Intratracheal instillation of 99mTc-DTPA or other instillations were performed at this starting time point. The perfusate was collected continuously and sampled at 15-min time intervals. The following treatments were investigated, group 1: control group, only 192Ir-UFP inhalation for 120 min; group 2: instillation of 50–100 μL 99mTc-DTPA, 500 μl H2O2 bolus (0.5 mM), 192Ir-UFP aerosol inhalation for 120 min; group 3: instillation of 50–100 μL 99mTc-DTPA, histamine continuously pefrused during the next 2 hours at concentration 10 μM, 192Ir-UFP aerosol inhalation for 120 min; group 4: instillation of 50–100 μL 99mTc-DTPA and 500 μl histamine bolus instillation at a concentration of 10 mM, 192Ir-UFP aerosol inhalation for 120 min; group 5: instillation of 50–100 μL 99mTc-DTPA. For each group 3–4 animals were used.Back to article page