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Olfactory Assays for Mouse Models of Neurodegenerative Disease
07:27

Olfactory Assays for Mouse Models of Neurodegenerative Disease

Published on: August 25, 2014

A novel role for jun N-terminal kinase signaling in olfactory sensory neuronal death

Nidhi M Gangadhar1, Stuart J Firestein, Brent R Stockwell

  • 1Department of Biological Sciences, Columbia University, NY, NY, USA.

Molecular and Cellular Neurosciences
|June 24, 2008
PubMed

Insights

Olfactory sensory neurons (OSNs) undergo continuous death and regeneration. Inhibiting transcription or translation prolongs OSN survival, revealing caspase and JNK signaling pathways critical for neuronal death.

Area of Science:

  • Neuroscience
  • Cell Biology

Background:

  • Olfactory sensory neurons (OSNs) are a unique neuronal population with continuous adult death and regeneration.
  • Understanding the mechanisms of OSN death is crucial for neurobiology research.
  • Existing knowledge regarding OSN death pathways remains limited.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying olfactory sensory neuron death.
  • To develop a reliable in vitro culture system for studying OSN death pathways.
  • To identify key signaling molecules involved in OSN apoptosis.

Main Methods:

  • Development of a novel in vitro culture system for OSNs.
  • Pharmacological inhibition of transcription (actinomycin D) and translation (cycloheximide).
  • Assessment of caspase activity and c-Jun N-terminal kinase (JNK) signaling pathways.
  • Validation of findings in an in vivo mouse bulbectomy model.

Main Results:

  • Inhibition of transcription and translation significantly prolonged OSN survival in culture.
  • Caspase activity and JNK signaling were identified as key contributors to OSN death.
  • Inhibition of JNK signaling effectively suppressed effector caspase (caspase-3) activation.
  • In vitro findings were corroborated by in vivo experiments using a mouse model.

Conclusions:

  • Transcription and translation are essential for OSN death.
  • Caspase and JNK signaling pathways are critical mediators of OSN apoptosis.
  • The developed in vitro system provides a valuable tool for studying OSN death mechanisms.

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