Modulatory role of cyclooxygenase inhibitors in aging- and scopolamine or lipopolysaccharide-induced cognitive dysfunction in mice.
Inflammation processes may play a critical role in the pathogenesis of the degenerative changes and cognitive impairments associated with Alzheimer's disease (AD). Non-steroidal anti-inflammatory drugs are reported to be effective in reducing the risk of developing AD or cognitive impairments. Present experiments were performed to study the possible effect of various NSAIDs on cognitive performance of young, aged and scopolamine or lipopolysaccharide (LPS) treated mice (an animal model of AD) using one trial step through type of passive avoidance and in elevated plus maze task. Chronic administration of NSAIDs at the ED(50) doses (nimesulide, rofecoxib and naproxen for 15 days) significantly reversed the age or scopolamine-induced retention deficits in both test paradigms. However, in both the memory paradigms chronic administration of NSAIDs failed to modulate the retention performance of young mice. Acute administration of LPS (50 mcg/mouse, i.p.) significantly exhibited retention deficits after 24 h and seventh day of its administration in both test paradigms. Chronic administration (7 days) of rofecoxib, a selective cyclooxygenase-2 (COX-2) inhibitor (1.92 mg/kg, p.o.) significantly reversed the LPS-induced retention deficits in both tests. The results of this study showed chronic treatment of NSAIDs reverses the cognitive deficits in age and scopolamine or LPS treated mice. These findings establish a link between the central nervous system expression of various pro-inflammatory cytokines and learning impairment in mice.
Pharmacology Division, University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh 160 014, India.
Naveen K
NK
Jain
C S
CS
Patil
Shrinivas K
SK
Kulkarni
Amarjit
A
Singh
D000375:Aging / Q000523:psychology*; D000818:Animals; D001007:Anxiety / Q000523:psychology; D001362:Avoidance Learning / Q000187:drug effects; D003072:Cognition Disorders / Q000139:chemically induced* / Q000517:prevention & control* / Q000523:psychology; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors / Q000009:adverse effects / Q000494:pharmacology*; D005260:Female; D005767:Gastrointestinal Diseases / Q000139:chemically induced; D007527:Isoenzymes / Q000378:metabolism; D007783:Lactones / Q000009:adverse effects / Q000494:pharmacology; D008070:Lipopolysaccharides / Q000633:toxicity*; D008297:Male; D008565:Membrane Proteins; D051379:Mice; D009043:Motor Activity / Q000187:drug effects; D018727:Muscarinic Antagonists / Q000633:toxicity*; D009288:Naproxen / Q000009:adverse effects / Q000494:pharmacology; D004856:Postural Balance / Q000187:drug effects; D011451:Prostaglandin-Endoperoxide Synthases / Q000378:metabolism; D012601:Scopolamine / Q000633:toxicity*; D013449:Sulfonamides / Q000009:adverse effects / Q000494:pharmacology; D013450:Sulfones
D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors; D007527:Isoenzymes; D007783:Lactones; D008070:Lipopolysaccharides; D008565:Membrane Proteins; D018727:Muscarinic Antagonists; D013449:Sulfonamides; D013450:Sulfones; C116926:rofecoxib; D009288:Naproxen; D012601:Scopolamine; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; D011451:Prostaglandin-Endoperoxide Synthases; C496512:Ptgs1 protein, mouse; C012655:nimesulide