Long-Term Memory Maintenance through Negative Feedback of Synaptic Protein Elimination

Strategic Insights -

Researchers at the University of Texas Medical School have made a significant breakthrough in understanding the mechanisms of long-term memory maintenance. Their study, published in Learning & Memory, reveals that interactions between kidney brain protein (KIBRA) and PKMz downregulate the degradation of synaptic proteins, allowing for the maintenance of late-phase long-term synaptic plasticity (LTP) and long-term memory. This alternative model is based on negative feedback at the level of protein elimination and challenges current theories that depend on molecular positive-feedback loops.

Key Takeaways:

  • The study reveals that interactions between KIBRA and PKMz downregulate the degradation of synaptic proteins, allowing for the maintenance of long-term memory.
  • The negative-feedback model based on KIBRA-PKMz interaction is an alternative to current theories that rely on molecular positive-feedback loops.
  • The biophysical theory predicts LTP/memory maintenance by complexes of cooperative KIBRA-PKMz heteromers.
  • The research has been peer-reviewed and published in the journal Learning & Memory.
  • The study was conducted at the University of Texas Medical School, and the lead author is Harel Z. Shouval.
  • Additional authors on the study include Changchi Hsieh, Rafael E. Flores-Obando, David A. Cano, Tara E. Tracy, and Todd C. Sacktor.
  • The research was supported by the National Institutes of Health.

Statistics:

  • 32 (issue number of the journal Learning & Memory)
  • 2025 (year of publication of the study)
  • 2693 (page number of the study)
  • 5 (number of authors on the study)
  • 1 (number of institutions involved in the study)

Sources:

  • "Maintenance of memory by negative feedback of synaptic protein elimination: modeling KIBRA-PKMz dynamics in LTP." Learning & Memory, 2025;32
  • University of Texas Medical School, Department of Neurobiology and Anatomy, Houston, Texas 77030, United States
  • National Institutes of Health, Bethesda, Maryland, USA
  • Cold Spring Harbor Lab Press, Publications Dept, 1 Bungtown Rd, Cold Spring Harbor, NY 11724, USA