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Exerkine GPLD1 bridges liver and brain.

Abel Plaza-Florido1, Pedro Carrera-Bastos2, Alejandro Lucia3

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Exercise boosts a liver enzyme (GPLD1) that improves brain health by enhancing cognition and reducing Alzheimer's pathology. This discovery highlights the liver-brain connection in exercise-induced neuroprotection.

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Area of Science:

  • Neuroscience
  • Metabolic research
  • Gerontology

Background:

  • Exercise is known to benefit brain health.
  • The specific molecular mechanisms linking exercise to neuroprotection are not fully understood.
  • The role of the liver in mediating exercise's effects on the brain requires further investigation.

Purpose of the Study:

  • To investigate the role of hepatic glycosylphosphatidylinositol-specific phospholipase D1 (GPLD1) in mediating exercise-induced neuroprotection.
  • To elucidate the enzymatic pathway connecting liver function to brain health.
  • To explore the potential of targeting this pathway for cognitive enhancement and Alzheimer's disease prevention.

Main Methods:

  • Measurement of hepatic GPLD1 levels following exercise interventions.
  • Analysis of GPLD1's enzymatic activity on tissue-nonspecific alkaline phosphatase (TNAP).
  • Assessment of cognitive function and Alzheimer's-related pathology in relevant models.

Main Results:

  • Exercise was found to significantly elevate hepatic GPLD1 levels.
  • GPLD1 was shown to cleave endothelial TNAP, suggesting a direct molecular interaction.
  • This enzymatic activity correlated with rejuvenated cerebrovascular signaling, enhanced cognition in aging, and reduced Alzheimer's pathology.

Conclusions:

  • A novel liver-to-brain enzymatic axis involving GPLD1 and TNAP mediates exercise-induced neuroprotection.
  • Hepatokines like GPLD1 are potent regulators of brain resilience.
  • Systemic metabolism plays a critical role in maintaining brain health and preventing age-related cognitive decline.