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Eitan Okun1, Boaz Barak, Ravit Saada-Madar

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Developmental Toll-like receptor 4 (TLR4) deficiency enhances spatial memory and impairs fear learning. However, adult TLR4 inhibition did not impact cognitive functions, suggesting a critical developmental role for TLR4 in brain function.

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Area of Science:

  • Neuroscience
  • Immunology
  • Cognitive Science

Background:

  • Toll-like receptors (TLRs) are crucial for innate immunity.
  • Increasing evidence shows TLRs are present in brain cells (neurons, astrocytes, microglia), mediating responses to infection, stress, and injury.
  • The role of TLRs in cognitive functions remains largely unexplored.

Purpose of the Study:

  • To investigate the role of Toll-like receptor 4 (TLR4) in hippocampus-dependent spatial learning and memory.
  • To determine if developmental or adult TLR4 signaling influences cognitive behaviors.

Main Methods:

  • Utilized mice genetically deficient in TLR4.
  • Administered a chronic TLR4 antagonist via infusion into the lateral ventricles of adult mice.
  • Assessed spatial learning, memory, contextual fear learning, motor function, and anxiety responses.

Main Results:

  • Developmental TLR4 deficiency improved spatial reference memory acquisition and retention.
  • Developmental TLR4 deficiency impaired contextual fear learning and enhanced motor functions.
  • CREB up-regulation in the hippocampus correlated with observed cognitive changes in TLR4-deficient mice.
  • Adult central TLR4 antagonist infusion did not affect cognitive behavior but influenced anxiety levels.

Conclusions:

  • TLR4 plays a significant developmental role in shaping spatial reference memory and fear learning.
  • Central inhibition of TLR4 in adulthood does not appear to have a discernible physiological role in regulating hippocampus-dependent cognitive behaviors.
  • Findings highlight the importance of developmental timing in TLR4's influence on brain function and cognition.