title: Prolonged effects of poly(lactic-co-glycolic acid) microsphere-containing huperzine A on mouse memory dysfunction induced by scopolamine.
abstract: Huperzine A is an anticholinesterase and cognitive enhancer, which is able to alleviate the symptoms of memory dysfunction in the mouse. The fast metabolization rate and narrow therapeutic spectrum makes it unfit for clinical use. Poly(lactic-co-glycolic acid) microsphere as delivery system effectively maintains the blood concentration of huperzine A by a slow-release effect over a long time. In the present article, we investigated the prolonged protective effect of microsphere-containing huperzine A on memory dysfunction induced by scopolamine. Spectrophotometric assay was used to determine the activity of acetylcholinesterase (AChE) and passive avoidance tests to evaluate memory performance. The results show that a bolus dose of microsphere-containing huperzine A (at a dose of 300 microg/kg or 600 microg/kg) administered intramuscularly can effectively maintain drug activity and significantly decrease the activity of AChE from day 3 to 14, the strongest effect seen on day 3 and 7. Accompanying the reduction of the activity of AChE, microsphere-containing huperzine A (300 microg/kg or 600 microg/kg) remarkably increased transfer latency time and no transfer response on the second trial through mitigating the memory impairments induced by scopolamine as compared to the scopolamine model group. Microsphere-containing huperzine A showed cognitive enhancing properties and anticholinesterase activity and may thus be a candidate for treatment of memory impairment.
authors.affiliation: Xi'an Jiaotong University School of Medicine, Xi'an, Shaanxi, China.
authors.forename: Chaoyun
authors.initials: C
authors.lastname: Wang
authors.forename: Taiping
authors.initials: T
authors.lastname: Zhang
authors.forename: Hongmei
authors.initials: H
authors.lastname: Ma
authors.forename: Juntian
authors.initials: J
authors.lastname: Liu
authors.forename: Fenghua
authors.initials: F
authors.lastname: Fu
authors.forename: Ke
authors.initials: K
authors.lastname: Liu
mesh_terms: D000110:Acetylcholinesterase / Q000187:drug effects / Q000378:metabolism; D000470:Alkaloids; D000818:Animals; D001362:Avoidance Learning / Q000187:drug effects*; D002540:Cerebral Cortex; D003692:Delayed-Action Preparations; D004337:Drug Carriers; D019344:Lactic Acid; D008297:Male; D008569:Memory Disorders / Q000139:chemically induced / Q000188:drug therapy*; D051379:Mice; D008863:Microspheres; D018727:Muscarinic Antagonists / Q000633:toxicity; D018696:Neuroprotective Agents / Q000494:pharmacology*; D011100:Polyglycolic Acid; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers; D011930:Reaction Time / Q000187:drug effects; D012601:Scopolamine / Q000037:antagonists & inhibitors / Q000633:toxicity; D012717:Sesquiterpenes / Q000494:pharmacology*; D013053:Spectrophotometry
chemical_list: D000470:Alkaloids; D003692:Delayed-Action Preparations; D004337:Drug Carriers; D018727:Muscarinic Antagonists; D018696:Neuroprotective Agents; D011108:Polymers; D012717:Sesquiterpenes; C050426:huperzine A; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D012601:Scopolamine; D000110:Acetylcholinesterase