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Activation of c-Jun N-terminal kinase and p38 in an Alzheimer's disease model is associated with amyloid deposition.
J Neurosci 2002; 22(9):3376-85JN

Abstract

The mechanisms by which neurons and synapses are lost in Alzheimer's disease (AD) are not completely understood. To characterize potential signaling events linked to AD pathogenesis, activation-specific antibodies were used to examine mitogen-activated protein kinase (MAPK) kinase pathways at various ages in mice transgenic for human amyloid precursor protein-695 with the Swedish familial AD mutations (Tg2576) and homozygous for a P264L familial AD mutation introduced by targeting of the presenilin-1 gene (PS1(P264L)). Although the c-Jun N-terminal kinase (JNK) and p38 pathways were significantly activated in the cortex at both 7 and 12 months of age, there was no significant activation of the extracellular signal-regulated kinase pathway. MAPK kinase-4, an upstream activator of JNK, was also significantly activated at 7 and 12 months, whereas c-Jun, a downstream effector of JNK-associated apoptotic signaling, was not induced. The lack of c-Jun activation is consistent with the absence of neuronal loss in both cortex and hippocampal CA1 at 12 months. The JNK activation was localized to amyloid deposits, within neurites containing phosphorylated tau. Synaptophysin was quantified biochemically as a measure of synaptic integrity and was significantly reduced in an age-dependent manner in the Tg2576/PS1(P264L) cortex but not in either PS1(P264L) or Tg2576 cortex. Stress-responsive MAP kinase pathways were activated in the brain of the Tg2576/PS1(P264L) AD model, and this activation was coincident with the age-dependent increase in amyloid deposition, tau phosphorylation, and loss of synaptophysin.

Authors+Show Affiliations

Department of Neurobiology, Cephalon Inc., West Chester, Pennsylvania 19380, USA. msavage@cephalon.comNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

11978814

Citation

Savage, Mary J., et al. "Activation of c-Jun N-terminal Kinase and P38 in an Alzheimer's Disease Model Is Associated With Amyloid Deposition." The Journal of Neuroscience : the Official Journal of the Society for Neuroscience, vol. 22, no. 9, 2002, pp. 3376-85.
Savage MJ, Lin YG, Ciallella JR, et al. Activation of c-Jun N-terminal kinase and p38 in an Alzheimer's disease model is associated with amyloid deposition. J Neurosci. 2002;22(9):3376-85.
Savage, M. J., Lin, Y. G., Ciallella, J. R., Flood, D. G., & Scott, R. W. (2002). Activation of c-Jun N-terminal kinase and p38 in an Alzheimer's disease model is associated with amyloid deposition. The Journal of Neuroscience : the Official Journal of the Society for Neuroscience, 22(9), pp. 3376-85.
Savage MJ, et al. Activation of c-Jun N-terminal Kinase and P38 in an Alzheimer's Disease Model Is Associated With Amyloid Deposition. J Neurosci. 2002 May 1;22(9):3376-85. PubMed PMID: 11978814.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Activation of c-Jun N-terminal kinase and p38 in an Alzheimer's disease model is associated with amyloid deposition. AU - Savage,Mary J, AU - Lin,Yin-Guo, AU - Ciallella,John R, AU - Flood,Dorothy G, AU - Scott,Richard W, PY - 2002/4/30/pubmed PY - 2002/5/22/medline PY - 2002/4/30/entrez SP - 3376 EP - 85 JF - The Journal of neuroscience : the official journal of the Society for Neuroscience JO - J. Neurosci. VL - 22 IS - 9 N2 - The mechanisms by which neurons and synapses are lost in Alzheimer's disease (AD) are not completely understood. To characterize potential signaling events linked to AD pathogenesis, activation-specific antibodies were used to examine mitogen-activated protein kinase (MAPK) kinase pathways at various ages in mice transgenic for human amyloid precursor protein-695 with the Swedish familial AD mutations (Tg2576) and homozygous for a P264L familial AD mutation introduced by targeting of the presenilin-1 gene (PS1(P264L)). Although the c-Jun N-terminal kinase (JNK) and p38 pathways were significantly activated in the cortex at both 7 and 12 months of age, there was no significant activation of the extracellular signal-regulated kinase pathway. MAPK kinase-4, an upstream activator of JNK, was also significantly activated at 7 and 12 months, whereas c-Jun, a downstream effector of JNK-associated apoptotic signaling, was not induced. The lack of c-Jun activation is consistent with the absence of neuronal loss in both cortex and hippocampal CA1 at 12 months. The JNK activation was localized to amyloid deposits, within neurites containing phosphorylated tau. Synaptophysin was quantified biochemically as a measure of synaptic integrity and was significantly reduced in an age-dependent manner in the Tg2576/PS1(P264L) cortex but not in either PS1(P264L) or Tg2576 cortex. Stress-responsive MAP kinase pathways were activated in the brain of the Tg2576/PS1(P264L) AD model, and this activation was coincident with the age-dependent increase in amyloid deposition, tau phosphorylation, and loss of synaptophysin. SN - 1529-2401 UR - https://www.unboundmedicine.com/medline/citation/11978814/Activation_of_c_Jun_N_terminal_kinase_and_p38_in_an_Alzheimer's_disease_model_is_associated_with_amyloid_deposition_ L2 - http://www.jneurosci.org/cgi/pmidlookup?view=long&pmid=11978814 DB - PRIME DP - Unbound Medicine ER -