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Age-dependent plasticity in endocannabinoid modulation of pain processing through postnatal development.

Charlie H-T Kwok1, Ian M Devonshire1, Amer Imraish1

  • 1School of Life Sciences, The University of Nottingham, Nottingham, United Kingdom. Kwok now with the Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada.

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Summary

Endocannabinoid (ECs) systems significantly change from birth to adulthood, impacting pain control. The orphan receptor GPR55 provides potent analgesia in immature brains, a function lost in adults.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Pain Research

Background:

  • Pain responses are significantly altered by age-dependent neural network remodeling.
  • Endocannabinoid (ECs) systems modulate pain in adults, but their role in early development and acute pain is unclear.

Purpose of the Study:

  • To investigate the developmental role of ECs in brainstem pain control pathways from birth to adulthood in rats and humans.
  • To elucidate age-related changes in ECs' function and their contribution to nociception.

Main Methods:

  • In vivo electrophysiology in rat brainstem nuclei (periaqueductal grey and rostroventral medulla).
  • Microinjection of ECs receptor agonists and antagonists.
  • Mass spectrometry to quantify endocannabinoid levels.
  • Quantitative PCR, immunohistochemistry, and in situ hybridization for enzyme and receptor expression analysis in rats and humans.

Main Results:

  • Functional changes in ECs receptor modulation of pain pathways were observed in the periaqueductal grey (PAG) and rostroventral medulla (RVM) from immature to adult stages.
  • The orphan receptor GPR55 mediated significant analgesia in immature PAG and RVM, which was absent in adults.
  • Developmental regulation of endocannabinoid neurotransmitters (anandamide, 2-arachidonoylglycerol) and key enzymes/receptors in the ECs system was confirmed in both species.

Conclusions:

  • The endocannabinoid system undergoes substantial, previously unknown developmental changes influencing pain perception.
  • These findings offer new insights into the neurochemical mechanisms underlying the maturation of pain responses.