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Chronic psychosocial stress exacerbates impairment of cognition and long-term potentiation in beta-amyloid rat model of Alzheimer's disease.
Biol Psychiatry 2009; 65(11):918-26BP

Abstract

BACKGROUND

Alzheimer's disease (AD) is a degenerative disorder that leads to progressive cognitive decline. Alzheimer's disease develops as a result of over-production and aggregation of beta-amyloid (Abeta) peptides in the brain. The reason for variation in the gravity of symptoms among AD patients is unknown and might result from patient-related factors including lifestyle. Individuals suffering from chronic stress are at an increased risk for developing AD. This study investigated the effect of chronic psychosocial stress in Abeta rat model of AD.

METHODS

Psychosocial stress was induced with a rat intruder model. The rat model of AD was induced by 14-day osmotic pump infusion of a mixture of 300 pmol/day Abeta(1-40)/Abeta(1-42). The effect of chronic stress on the severity of Abeta-induced spatial learning and memory impairment was tested by three approaches: behavioral testing in the radial arm water maze, in vivo electrophysiological recording in anesthetized rat, and immunoblot analysis to determine protein levels of learning- and memory-related molecules.

RESULTS

A marked impairment of learning and memory developed when stress was combined with Abeta, more so than that caused by Abeta alone. Additionally, there was a significantly greater impairment of early-phase long-term potentiation (E-LTP) in chronically stressed/Abeta-treated rats than in either the stressed or Abeta-treated rats. This might be a manifestation of the reduction in protein levels of calcium/calmodulin-dependent protein kinase II (CaMKII) and the abnormal increase in calcineurin levels.

CONCLUSIONS

Chronic stress significantly intensified Abeta-induced deficits of short-term memory and E-LTP by a mechanism involving decreased CaMKII activation along with increased calcineurin levels.

Authors+Show Affiliations

Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston, Houston, Texas 77204-5037, USA.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

18849021

Citation

Srivareerat, Marisa, et al. "Chronic Psychosocial Stress Exacerbates Impairment of Cognition and Long-term Potentiation in Beta-amyloid Rat Model of Alzheimer's Disease." Biological Psychiatry, vol. 65, no. 11, 2009, pp. 918-26.
Srivareerat M, Tran TT, Alzoubi KH, et al. Chronic psychosocial stress exacerbates impairment of cognition and long-term potentiation in beta-amyloid rat model of Alzheimer's disease. Biol Psychiatry. 2009;65(11):918-26.
Srivareerat, M., Tran, T. T., Alzoubi, K. H., & Alkadhi, K. A. (2009). Chronic psychosocial stress exacerbates impairment of cognition and long-term potentiation in beta-amyloid rat model of Alzheimer's disease. Biological Psychiatry, 65(11), pp. 918-26. doi:10.1016/j.biopsych.2008.08.021.
Srivareerat M, et al. Chronic Psychosocial Stress Exacerbates Impairment of Cognition and Long-term Potentiation in Beta-amyloid Rat Model of Alzheimer's Disease. Biol Psychiatry. 2009 Jun 1;65(11):918-26. PubMed PMID: 18849021.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Chronic psychosocial stress exacerbates impairment of cognition and long-term potentiation in beta-amyloid rat model of Alzheimer's disease. AU - Srivareerat,Marisa, AU - Tran,Trinh T, AU - Alzoubi,Karem H, AU - Alkadhi,Karim A, Y1 - 2008/10/11/ PY - 2008/07/01/received PY - 2008/08/12/revised PY - 2008/08/25/accepted PY - 2008/10/14/pubmed PY - 2009/7/28/medline PY - 2008/10/14/entrez SP - 918 EP - 26 JF - Biological psychiatry JO - Biol. Psychiatry VL - 65 IS - 11 N2 - BACKGROUND: Alzheimer's disease (AD) is a degenerative disorder that leads to progressive cognitive decline. Alzheimer's disease develops as a result of over-production and aggregation of beta-amyloid (Abeta) peptides in the brain. The reason for variation in the gravity of symptoms among AD patients is unknown and might result from patient-related factors including lifestyle. Individuals suffering from chronic stress are at an increased risk for developing AD. This study investigated the effect of chronic psychosocial stress in Abeta rat model of AD. METHODS: Psychosocial stress was induced with a rat intruder model. The rat model of AD was induced by 14-day osmotic pump infusion of a mixture of 300 pmol/day Abeta(1-40)/Abeta(1-42). The effect of chronic stress on the severity of Abeta-induced spatial learning and memory impairment was tested by three approaches: behavioral testing in the radial arm water maze, in vivo electrophysiological recording in anesthetized rat, and immunoblot analysis to determine protein levels of learning- and memory-related molecules. RESULTS: A marked impairment of learning and memory developed when stress was combined with Abeta, more so than that caused by Abeta alone. Additionally, there was a significantly greater impairment of early-phase long-term potentiation (E-LTP) in chronically stressed/Abeta-treated rats than in either the stressed or Abeta-treated rats. This might be a manifestation of the reduction in protein levels of calcium/calmodulin-dependent protein kinase II (CaMKII) and the abnormal increase in calcineurin levels. CONCLUSIONS: Chronic stress significantly intensified Abeta-induced deficits of short-term memory and E-LTP by a mechanism involving decreased CaMKII activation along with increased calcineurin levels. SN - 1873-2402 UR - https://www.unboundmedicine.com/medline/citation/18849021/Chronic_psychosocial_stress_exacerbates_impairment_of_cognition_and_long_term_potentiation_in_beta_amyloid_rat_model_of_Alzheimer's_disease_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0006-3223(08)01019-6 DB - PRIME DP - Unbound Medicine ER -