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Cognitive rejuvenation through partial reprogramming of engram cells.

Gabriel Berdugo-Vega1, Cesar Sierra1, Simone Astori2

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Partial cellular reprogramming of memory trace cells reversed aging and Alzheimer's hallmarks in mice. This cognitive rejuvenation strategy restored learning and memory, offering hope for age-related cognitive decline.

Keywords:
Alzheimer's diseaseOSKageengramepigeneticpartial reprogrammingrejuvenationtranscription

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Area of Science:

  • Neuroscience
  • Regenerative Medicine
  • Epigenetics

Background:

  • Cognitive decline is a major challenge in aging and Alzheimer's disease (AD).
  • Partial cellular reprogramming shows potential for tissue regeneration but its efficacy in neural circuits is unexplored.
  • Engram neurons are critical for memory trace formation and recall.

Purpose of the Study:

  • To investigate if partial reprogramming of engram neurons can counteract cognitive decline in aging and AD models.
  • To assess the impact of reprogramming on cellular hallmarks, epigenetic patterns, and neuronal function.

Main Methods:

  • OSK-mediated gene therapy for partial reprogramming of engram neurons.
  • Utilized aged mice and mouse models of Alzheimer's disease.
  • Evaluated cellular senescence, epigenetic-transcriptional patterns, neuronal excitability, and cognitive performance.

Main Results:

  • Partial reprogramming reversed senescence and disease-related markers in aged and AD model mice.
  • Restored epigenetic-transcriptional patterns associated with synaptic plasticity.
  • Counteracted AD-typical neuronal hyperexcitability and recovered learning and memory capacities.

Conclusions:

  • Partial reprogramming of engram neurons promotes cognitive rejuvenation.
  • This approach offers a potential therapeutic strategy for cognitive restoration in aging and neurodegenerative diseases.
  • Targeting specific cell populations like engram neurons is key for brain repair.