Central noradrenergic depletion by DSP-4 prevents stress-induced memory impairments in the object recognition task

• Published in: Neuroscience Vol. 164; no. 2; pp. 415 - 423
• Main Authors: Scullion, G.A, Kendall, D.A, Sunter, D, Marsden, C.A, Pardon, M.-C
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Ltd 01.12.2009; Elsevier
• Subjects: Adrenergic Agents - pharmacology; Animals; Benzylamines - pharmacology; Biological and medical sciences; Environment; environmental stress; Frontal Lobe - drug effects; Frontal Lobe - metabolism; Fundamental and applied biological sciences. Psychology; Hippocampus - drug effects; Hippocampus - metabolism; Hydroxyindoleacetic Acid - metabolism; Male; memory; Memory Disorders - drug therapy; Memory Disorders - etiology; Memory Disorders - metabolism; Mice; Mice, Inbred C57BL; mouse; Neurology; Neuropsychological Tests; noradrenaline; Norepinephrine - metabolism; object recognition; Random Allocation; Recognition (Psychology) - drug effects; Recognition (Psychology) - physiology; Serotonin - metabolism; Stress, Psychological - complications; Stress, Psychological - metabolism; Time Factors; Vertebrates: nervous system and sense organs; object recognition; environmental stress; memory; 3-Methoxy4-hydroxyphenylglycol; cAMP; DSP-4; mouse; 5-hydroxyindoleacetic acid; NA; analysis of variance; cyclic adenosine monophosphate; ANOVA; 5-HIAA; MHPG; N-(2-chloroethyl)- N-ethyl-2 bromobenzylamine; high-performance liquid chromatography; noradrenaline; HPLC; Memory; Rodentia; Catecholamine; Stress; Vertebrata; Mammalia; Depletion; Mouse; Animal; Norepinephrine
• ISSN: 0306-4522; 1873-7544
• DOI: 10.1016/j.neuroscience.2009.08.046

Abstract Environmental stress produces adverse affects on memory in humans and rodents. Increased noradrenergic neurotransmission is a major component of the response to stress and noradrenaline (NA) plays an important role in modulating processes involved in learning and memory. The present study investigated the effect of NA depletion on stress-induced changes on memory performance in the mouse. Central NA depletion was induced using the selective neurotoxin N -(2-chloroethyl)- N -ethyl-2 bromobenzylamine (DSP-4) and verified by high performance liquid chromatography (HPLC). A novel cage stress procedure involving exposure to a new clean cage for 1 h per day, 4 days per week for 4 weeks, was used to produce stress-induced memory deficits measured using the object recognition task. 50 mg/kg DSP-4 produced large and sustained reductions in NA levels in the frontal cortex and hippocampus measured 24 h, 1 week and 5 weeks after treatment. Four weeks of exposure to novel cage stress induced a memory deficit in the object recognition task which was prevented by DSP-4 pre-treatment (50 mg/kg 1 week before the commencement of stress).These findings indicate that chronic environmental stress adversely affects recognition memory and that this effect is, in part, mediated by the noradrenergic stress response. The implication of these findings is that drugs targeting the noradrenergic system to reduce over-activity may be beneficial in the treatment of stress-related mental disorders such as post-traumatic stress disorder or anxiety in which memory is affected.