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Tuberous sclerosis protein 2 (TSC2) modulates CCN4 cytoprotection during apoptotic amyloid toxicity in microglia

Yan Chen Shang1, Zhao Zhong Chong, Shaohui Wang

  • 1Laboratory of Cellular and Molecular Signaling, New Jersey Health Sciences University, Newark, NJ 07101, USA.

Current Neurovascular Research
|December 19, 2012
PubMed

Insights

Wnt1 inducible signaling pathway protein 1 (WISP1/CCN4) influences key proteins in Alzheimer's disease (AD) pathology. WISP1 regulates cell survival pathways, offering potential new therapeutic targets for AD and cognitive loss.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Alzheimer's disease (AD) affects millions globally, with β-amyloid (Aβ) toxicity being a key pathological feature.
  • Current treatments for AD targeting Aβ toxicity are limited, necessitating novel drug development strategies.

Purpose of the Study:

  • To investigate the role of Wnt1 inducible signaling pathway protein 1 (WISP1/CCN4) in the molecular pathways implicated in AD.
  • To elucidate how WISP1 influences cellular responses to Aβ exposure.

Main Methods:

  • Western blotting to assess protein phosphorylation.
  • Gene silencing techniques (siRNA) to manipulate WISP1 and TSC2 expression.
  • Apoptosis assays (phosphatidylserine exposure, DNA degradation, mitochondrial depolarization, cytochrome c release) in microglia exposed to Aβ.

Main Results:

  • WISP1 modulates the phosphorylation of Akt1, p70S6K, and AMP-activated protein kinase (AMPK).
  • WISP1 influences the phosphorylation of tuberous sclerosis complex 2 (TSC2) at Ser1387 (AMPK target) and Thr1462 (Akt1 target).
  • WISP1-mediated reduction in TSC2 activity enhances p70S6K activity, but TSC2 activity is crucial for WISP1-induced cytoprotection against Aβ toxicity in microglia.

Conclusions:

  • WISP1 plays a significant role in regulating cellular signaling pathways relevant to AD pathogenesis.
  • WISP1's cytoprotective effects against Aβ toxicity are dependent on a basal level of TSC2 activity, potentially involving mTOR signaling.
  • WISP1 represents a potential therapeutic target for mitigating Aβ-induced neurotoxicity in Alzheimer's disease.

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