Author/Authors :
Tabrizian, Kaveh Department of Pharmacology and Toxicology - Faculty of Pharmacy - Zabol University of Medical Sciences , Najafi, Sheyda Department of Pharmacology and Toxicology - Zabol University of Medical Sciences , Belaran, Maryam Department of Pharmacology and Toxicology - Zabol University of Medical Sciences , Hosseini-Sharifabad, Ali Department of Pharmacology and Toxicology - Zabol University of Medical Sciences , Azami, Kian Department of Pharmacology and Toxicology - Zabol University of Medical Sciences , Hosseini, Asieh Department of Pharmacology and Toxicology - Zabol University of Medical Sciences , Soodi, Maliheh Department of Toxicology - Faculty of Medical Sciences - Tarbiat Modares University, Tehran , Kazemi, Ali Department of Pharmacology and Toxicology - Tarbiat Modares University, Tehran , Kebriaeezadeh, Abbas Department of Pharmacology and Toxicology - Tarbiat Modares University, Tehran , Sharifzadeh, Mohammad Department of Pharmacology and Toxicology - Pharmaceutical Sciences Research Center - Faculty of Pharmacy - Tehran University of Medical Sciences
Abstract :
Nitric oxide (NO) is thought to be involved in spatial learning and memory in several brain areas such as hippocampus. This study examined the effects of post-training intrahippocampal microinjections of 1400W as a selective inducible nitric oxide synthase (iNOS) inhibitor on spatial memory, in both anesthetized and non-anesthetized situations in rats. In the present work, 4-day training trials of animals were conducted. Spatial memory was tested 48 h after the drug infusions. For microinjection of 1400W into CA1 region of the hippocampus in conscious animals, guide cannula was implanted into the CA1 area and 1400W was infused after recovery from surgical anesthesia. In anesthetized animals, 1400W was microinjected directly into CA1 region by Hamilton syringe during anesthesia. After completion of training, 1400W (10, 50 and 100 μM/side) were microinjected bilaterally (1 μL/side) and testing trials were performed 48 h after drug infusions in both groups of cannulated and non-cannulated rats. Significant reduction was observed in escape latency and traveled distance in animals that received 1400W (100 μM/side, * P < 0.05) via cannula after recovery in comparison with control group. Moreover, microinjection of 1400W (100 μM/side) in post recovery phase also caused a significant (*** P < 0.001) reduction in time and distance of finding the hidden platform in comparison with anesthetized situation. These results suggest that 1400W has a significant improvement on spatial memory, and memory enhancement induced by iNOS inhibitor can be affected by anesthesia in a period of time.
Keywords :
Inducible nitric oxide synthase , Anesthesia , CA1 region , Morris water maze , Spatial memory , Protein kinase , Wistar Rats
