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Related Experiment Videos

Carboxyl-terminus of the amyloid protein precursor and ERbeta are required for estrogenic effect in activating

Hwa J Lim1, Chul J Lim, Dae Y Hwang

  • 1Division of Laboratory Animal Resources, Korea Food and Drug Administration, National Institute of Toxicological Research, Seoul 122-704, Republic of Korea.

International Journal of Molecular Medicine
|April 7, 2004
PubMed
Summary

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Estrogen

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Endocrinology

Background:

  • Estrogen plays a role in Alzheimer's disease pathogenesis by influencing amyloid precursor protein (APP) processing.
  • Estrogen receptors (ERs) mediate this effect via the mitogen-activated protein kinase (MAPK) signaling pathway.

Purpose of the Study:

  • To investigate the estrogenic effect on the carboxyl-terminal fragment of APP (APP-C105) and ERbeta-mediated MAPK activation.
  • To elucidate the role of ERbeta and APP-C105 in estrogen-induced MAPK signaling in neuronal cells.

Main Methods:

  • Constructed hybrid genes with human ERbeta and APP-C105 fused to the neuron-specific enolase (NSE) promoter.
  • Transfected these constructs into neuronal SK-N-MC cells.
  • Utilized Western blot analysis to assess MAPK pathway activation.

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Main Results:

  • Estrogen treatment activated the JNK signaling pathway, dependent on ERbeta.
  • APP-C105 mediated estrogen's effect on MAPK pathway activation.
  • p38 and ERK pathways were not significantly affected.

Conclusions:

  • ERbeta and APP-C105 are crucial for estrogen's activation of the MAPK signaling pathway.
  • This pathway modulation may be a key mechanism in estrogen's influence on Alzheimer's disease pathogenesis.